Submitted Successfully!
To reward your contribution, here is a gift for you: A free trial for our video production service.
Thank you for your contribution! You can also upload a video entry or images related to this topic.
Version Summary Created by Modification Content Size Created at Operation
1 + 2971 word(s) 2971 2021-01-07 03:43:26 |
2 format correct -96 word(s) 2875 2021-01-14 03:18:58 |

Video Upload Options

Do you have a full video?

Confirm

Are you sure to Delete?
Cite
If you have any further questions, please contact Encyclopedia Editorial Office.
Fraga, H. Olive orchards under climate change. Encyclopedia. Available online: https://encyclopedia.pub/entry/6378 (accessed on 17 June 2024).
Fraga H. Olive orchards under climate change. Encyclopedia. Available at: https://encyclopedia.pub/entry/6378. Accessed June 17, 2024.
Fraga, Helder. "Olive orchards under climate change" Encyclopedia, https://encyclopedia.pub/entry/6378 (accessed June 17, 2024).
Fraga, H. (2021, January 13). Olive orchards under climate change. In Encyclopedia. https://encyclopedia.pub/entry/6378
Fraga, Helder. "Olive orchards under climate change." Encyclopedia. Web. 13 January, 2021.
Olive orchards under climate change
Edit

The olive tree (Olea europaea L.) is an ancient traditional crop in the Mediterranean Basin. In the Mediterranean region, traditional olive orchards are distinguishable by their prevailing climatic conditions. Olive trees are indeed considered one of the most suitable and best-adapted species to the Mediterranean-type climate. However, new challenges are predicted to arise from climate change, threatening this traditional crop. The Mediterranean Basin is considered a climate change “hotspot,” as future projections hint at considerable warming and drying trends. Changes in olive tree suitability have already been reported over the last few decades. In this context, climate change may become particularly challenging for olive growers.

Mediterranean olive orchards olive trees climate

1. Olive Orchards in the Mediterranean Basin

The olive tree (Olea europaea L.) is an ancient, traditional crop in the Mediterranean Basin [1][2]. It is believed that the olive tree originated in the Mediterranean region and has been cultivated since 4800 B.C. [3]. Today, this perennial evergreen tree has great socio-economic importance for many countries in southern Europe [4], which jointly produce roughly 95% of the world’s supply of olive oil [5]. The world’s production of olive oil is approximately 2.5 million tons (Figure 1), and the main producers are Spain (38%), Italy (11%) and Greece (11%) (Table 1). From 1990 to 2018, olive oil production underwent an upward trend (36 × 103 t/yr), mostly driven by the increases in Spain [6], although the effect of biennial or alternate bearing is apparent (high/low yield years). About 90% of the world’s olive production is for oil extraction, whereas the remaining 10% is for table olives [7]. Since olive oil is traditionally exported worldwide, this crop has become the foundation for the economic development in many of these agrarian regions [6].

Figure 2 depicts the current olive orchard land cover in the Mediterranean Basin. The olive tree area worldwide is approximately 10 million hectares—more than 90% is located in the Mediterranean Basin, mainly in Spain (25%), Tunisia (13%), Italy (11%), Morocco (10%) and Greece (9%) [7]. The growing awareness of olive oil’s nutritional value has been helping with the expansion of olive tree cultivation area over the last few decades [6]. Some of the most important olive-growing regions in Europe are Andalucía, Extremadura and Castilla/La Mancha, in Spain; Sardegna, Sicily and Puglia, in Italy; and Crete and Peloponnese, in Greece [6].

Figure 1. Olive oil production (tons) from 1990 to 2018 along with the linear trend (LT), adapted from [8].

Figure 2. Distribution of the olive orchards in the Mediterranean region according to [9].

In the recent past, most of the Mediterranean olive orchards were grown under rainfed conditions and low-density management systems (<100 plants/ha) [10], mostly exploiting marginal areas characterized by shallow soils and steep terrain that could not easily be used for other crop cultivation [11]. Under these circumstances, while playing a significant role in local economies [12][13], olive cultivation may indeed contribute to the preservation of natural resources of the ecosystem through soil protection, enhanced soil water retention and carbon sequestration [14][15][16][17][18].

Nonetheless, a recent increase in global food demand, lack of human labor and other socio-economic constraints, such as the need to increase profitability, are promoting a shift toward intensive (200–500 plants/ha) or even super-intensive (up to 2500 plants/ha) cropping systems. Therefore, crop profitability through the reduction of costs per unit yield is the main reason for the change in crop management. These changes also entail that large areas need to be irrigated and fertilized to increase yield per area [19]. Additionally, olive trees need to be adapted to mechanical pruning and harvesting [20].

The large expansion area and long life of the olive tree explain the vast number of existing cultivars, over 2600 [3] (Table 1). The behavior of each variety in each region results from genetic determinism, which is expressed in the characteristics of each cultivar [3]. These genetic traits are then expressed in phenology, fruit ripeness, resistance to stress, resistance to pests and diseases, final yield and oil quality. Despite the different characteristics of each cultivar, it is known that most of these expressions are also strongly conditioned by the pedoclimatic conditions prevalent in each olive grove.

Table 1. List of the top countries regarding olive tree production and area (2016–2018) [7], and also the list of the most used cultivars in each country [3].

Country

Prod. (t)

%

Area (ha)

%

Main Cultivars

Spain

7,817,206

38

2,551,841

25

Arbequina, Alorena, Cornicabra, Empeltre, Farga, Gordal Sevillana, Hojiblanca, Lechín de Sevilla, Manzanilla de Sevilla, Morisca, Negral, Nevadillo, Picual, Picudo

Greece

2,224,096

11

851,194

9

Anphissis, Chalkidiki, Conservolia, Kalamon, Koroneiki, Kolybada, Lianolia, Mastoidis, Megaritiki

Italy

2,171,166

11

1,144,782

11

Ascolana, Bella di Cerignola, Biancolilla, Bosana, Canino, Carolea, Casaliva, Coratina, Frantoio, Leccino, Moraiolo, Nocellara del Belice, Nocellara etnea, Ogliarola, Pendolino, Peranzana, Taggiasca

Turkey

1,776,822

9

852,011

8

Ayvalik, Domat, Erkence, Çakir, Memecik, Memeli, Uslu, Izmir Sofralik, Gemlik

Morocco

1,338,896

7

1,024,707

10

Picholine Marocaine, Dahbia, Haouzia, Menara, Meslala

Egypt

912,549

4

81,523

1

Aggizi Shame, Kosiem, Maraki, Meloky, Hamed, Sebhawi, Sinawy, Toffahi, Wateken

Algeria

747,225

4

429,217

4

Aaroun, Azeradj, Blanquette, Bouchouk, Chemlal, Ferkani, Khadraya, Hamra, Limli, Mekki, Sigoise, Roulette

Portugal

697,456

3

358,647

4

Galega, Corbrançosa, Cordovil, Verdeal Transmontana, Carrasquenha, Lentrisca, Madural

Tunisia

675,156

3

1,372,104

13

Chétoui, Chemlali, Oueslati, Chemlali Tataouine, Zalmati, Gerboui, Baroni, Rkhami

World

20,337,435

 

10,185,151

 

 

In the Mediterranean Basin, traditional olive orchards tend to have distinctive climatic conditions [4]. Olive trees are considered one of the most suitable and best-adapted species to the Mediterranean-type climate [21][22]. Long, warm and dry summers, with mild and wet winters, are general features of this climate [23][24]. Additionally, olive orchards in the Mediterranean are usually exposed to high levels of solar radiation, particularly during spring and summer. Nowadays, olive trees face new challenges and threats, some of the most important being related to climate change. Increased warming and drought, and increases in the frequency of the occurrence of extreme weather events, such as heatwaves, are some of the problems that growers will have to deal with in the upcoming decades.

2. The Olive Tree Cycle and Climatic Influences

Globally, the olive tree cultivation is approximately limited by the 30º to 45º parallels [3] (Figure 2). This latitudinal belt suggests that climatic conditions are a key factor for olive tree cultivation, and for its development cycle, and the link between climate and olive cultivation was recognized very early on. Theophrastus (as reported by Pliny the Elder [Plin. Nat. 15.1]), for example, identified its geographical limits, indicating that the olive tree had to be cultivated at no more than 300 stages (53 km) from the Mediterranean coast. Pliny the Elder observed that the climatic limits were imposed by the sensitivity of the plant to low temperatures, winter frost and extremely high temperatures in summer (“Fabianus negat provenire in frigidissimis oleam neque in calidissimis”; Fabiano stated that the olive tree will not grow either in very cold climates or in very hot ones [Plin. Nat. 15.2]). In other words, Pliny the Elder roughly indicated that the most suitable climatic conditions for the cultivation of the olive tree are represented by what today is called a typical Mediterranean climate, which represents the transition between the arid climate of Northern Africa and the temperate rainy climate of Central Europe [25]. As a matter of fact, an olive tree typically cannot withstand temperatures below –8 ° C for more than one week [26]. Very high summer temperatures may also limit its yield performances, namely, maximum temperatures higher than ~30 °C [27], and its photosynthetic rate when exceeding 40 °C [28]. A comprehensive climatological analysis over the Mediterranean Basin indicated that olive cultivation areas are nowadays constrained by temperatures of the coldest (mean monthly temperature of January) and warmest months (mean monthly temperature of July), where the optimum monthly mean temperatures for its cultivation are centered on ~7 °C in January and ~25 °C in July [25].

Temperature acts as the main driver of olive tree phenology by regulating the release from the endo-dormancy period, after the accumulation of adequate cold units during wintertime (chill units), and the release from the eco-dormancy period, whose duration is dependent on forcing units cumulated from the end of endo-dormancy to flowering stage [29][30][31]. The transition between the growing and rest period is triggered by temperatures below 14.4 °C [32]. The fulfillment of the chilling requirement plays a major role in determining olive flowering [33], since the accumulated exposure to cold temperatures enables plants to properly set inflorescence production when warmer temperatures arise. Accordingly, olive trees planted under tropical conditions do not usually produce fruits, mostly due to the lack of sufficient chilling accumulation [33]. Both chill and forcing unit accumulation have metrics that are generally consistent in the literature. Rallo and Martin [34] and De Melo-Abreu et al. [35] indicated that the best hourly temperature for chilling accumulation is just above 7 °C (accumulation of temperatures below 7.2/7.3 °C), while base temperature for thermal unit accumulation ranges between 8 and 9.2 °C [35].

Another very important climatic factor is precipitation. About 90% of the olive trees grown in the Mediterranean Basin are primarily under rainfed conditions [36][37]. Although olive trees are drought-tolerant species, their distribution in arid zones is limited by annual precipitation lower than 350 mm [38], and water availability is still considered an important resource to improve final yields. For this reason, olive growers employ management practices, such as sparse plantings and heavy pruning, to avoid severe water stress. This highlights the key role played by precipitation in the economic viability of this crop, which is exacerbated by the typically dry summers in their cultivation areas. Hence, growers strongly depend on the efficient use of winter and spring rainfall for their orchard productivity. However, soil properties, such as soil water holding capacity, also play noteworthy roles in olive tree development. Despite being well adapted to low fertility, shallow and poor soils, the best conditions for olive trees are deep and fertile soils with moderate water contents.

Other atmospheric factors, such as solar radiation, relative humidity and wind, also influence the productivity of olive orchards. For example, wind-affected areas should not be used for olive tree cultivation, since cold and moist winds during spring reduce flower fertilization and fruit growth. Furthermore, hot winds during the summer instigate fruit drop, while dry winds seem to result in early maturation and fruit shriveling. Furthermore, since wind plays a fundamental role in olive tree pollination [39], dry and hot winds may damage pollen grains. Along these lines, olive tree development is very sensitive to climate and weather conditions, and hence is exposed and vulnerable to climate change. Therefore, it is imperative to determine the extents of the likely impacts of climate change on this crop.

3. Climate Change Projections and Olive Growing Conditions

Climate change is an undeniable fact that is challenging society and every economic sector, including agriculture. In the Mediterranean region, recent reports show that significant warming has occurred in the last 40 years and annual temperatures are now about 1.5 °C higher with respect to the preindustrial period (1880–1899) and well above current global warming trends (+1.1 °C), and since 2014, we experienced the six warmest years on record, globally [40]. Increasing temperatures were accompanied by a series of extreme heat events that occurred at an unprecedented trend in terms of duration, intensity and frequency [41][42], and there has been a substantial decrease in the frequency of cold extremes [43][44].

In the Mediterranean Basin, the observed precipitation regime is characterized by high variability in space and in time. The overall analysis of extreme precipitation indices reveals that decreasing trends are generally more frequent than increasing trends [45]. Indeed, a more noticeable decreasing tendency in the annual total precipitation is projected, especially over the west-central Mediterranean area [46] and the southern shores of the Mediterranean region [45], though with different local rates [47].

According to the Intergovernmental Panel on Climate Change (IPCC), climate change projections point out that temperatures will continue to rise and precipitation patterns will shift [48]. Although several future scenarios or representative concentration pathways (RCP) have been projected, with different degrees of severity, all point to an overall increase in temperature, though its magnitude is highly dependent on the emission scenario [48]. Although these projections still have high uncertainties, mostly due to climate model limitations and their parameterizations, [49][50], it is becoming clear that these projections for future decades tend to be consistent with the recent-past trends [50]. It is worth mentioning that the regional impacts may be stronger/weaker than the global mean signal. Each socio-economic sector, namely, in agriculture, will reveal non-linear responses to changes in temperature, besides their limited ability to adapt to new forcing conditions.

For the Mediterranean region, future climate projections tend to be particularly severe. In this region, precipitation projections point to an overall decrease, which will lead to a lowering of soil water availability. The Mediterranean region is already characterized by plant heat and water stresses, due to the harsh summertime weather conditions, including low precipitation, excessive heat and high solar radiation. Moreover, nocturnal temperatures will also tend to increase, leading to an even higher thermal stress level. Another manifestation of climate change is the modification in the frequency of the occurrence of extreme weather events, such as heatwaves, hail, floods and wildfires, amongst others [51][52][53][54]. These events are projected to increase in frequency and magnitude under climate change scenarios, leading to a rise in the severity of drought and heatwave spells over the Mediterranean Basin.

Future climatic changes have great importance for the agricultural sector as a whole, and the olive tree sector in particular. Regarding perennial crops, such as olive trees, under future climatic conditions these projections are expected to cause severe adverse effects, particularly on water relations [55][56][57], oxidative pathways and other physiological processes [58][59][60], phenological timings [61], final yield [62][63][64][65] and quality attributes [66].

Recent studies applied to olive trees have shown that this crop can be strongly affected by climate change [67], particularly under the Mediterranean type-climates [68]. For instance, rising temperatures may have a strong impact on this crop. The expected increase in temperatures may increase the growing season’s length [69]. This will also lead to changes in the phenological timings, particularly in flowering, with potentially detrimental impacts [70][71]. Furthermore, higher temperatures and enhanced evapotranspiration also accelerate fruit ripening, invoking the need for early harvests, though at lower maturity levels [72]. The rise in temperatures could also result in a decrease in chilling conditions [73]. Insufficient chilling results in a low fruit setting with detrimental consequences on final yields, as some olive varieties produce deformed floral buds and fruits under these circumstances [74].

Apart from the aforementioned warming effects, water availability also represents a critical issue, particularly for achieving reasonable yields [75]. However, change in water availability is also a major challenge under future climates in the Mediterranean Basin. Nowadays, drought is considered a key limiting factor for agricultural productivity [76]. Although olive trees are a drought-tolerant species, water stress may result in a wide range of negative impacts [77], such as a low flower-setting and fruit-setting, low leaf area, limited photosynthesis, flower abortion and cluster abscission. Fraga et al., in a study for Alentejo (the main olive producing region in Portugal), depicted decreases in precipitation (–80–90 mm) and actual evapotranspiration (–50–70 mm) following two future scenarios (RCP4.5 and RCP8.5). These projections may lead to a general decrease in yields until 2080 due to increased water stress conditions. These impacts are particularly important when considering that traditional olive groves are strictly rainfed.

Other studies suggest a decrease in the suitability of the current olive orchards in southern Europe, owing to excessive heat and water stress [78][79]. These studies indicate that climate change impacts may be very heterogeneous, since their magnitudes can be quite different from one region to the other [80]. As an example, a study by Ponti et al., concerning future climatic projections, pointed to high economic losses for small olive farms in Italy and Greece, while for some other regions in Europe, these authors pointed to increases in productivity. These outcomes were corroborated by other studies. Orlandi et al. [81], for Italy, suggest that the increase in aridity during the summer signifies an important risk of decreasing olive production. Nonetheless, the authors also recognize that the effect of climate change on the olive yield trend is still mostly unclear, due of the possible interactions between human and environmental factors, and some areas may indeed undergo an increase in productivity in the future. Fraga et al., using an ensemble of regional climate models coupled with a dynamic crop model for olive trees, found similar results, and highlighted heteronomous climate change impacts on yield over southern Europe. These studies indicate the need for regional-to-local climate change impact assessments, as local specificities in climatic conditions may affect the outcomes. Nonetheless, all these studies agree that climate change will negatively impact olive tree yields in some of the warmest and driest regions of the Mediterranean Basin. Another aspect of climate change is related to the impacts of pests and diseases. In fact, studies are reporting that climate change is already affecting Mediterranean areas and enhancing the susceptibility of local olive tree cultivars to certain diseases [82]

One positive aspect of climate change should also be mentioned, i.e., the possible beneficial effect of higher CO2 atmospheric concentrations in the future. It is known that the increase in CO2 levels under future climates may have a positive influence on plants, mostly by increasing biomass under CO2-enriched environments. This effect may partially counteract climate change’s detrimental impacts resulting from enhanced heat and water stresses [83]. The widespread distribution of olive groves in the Mediterranean Basin can be also exploited for their important carbon sequestration capacity to mitigate the impact of climate change. Reference, following a modelling approach, evidenced the reduction of net primary production and productivity of extensive management of olive groves in warming scenarios of +1.5 and +2 °C, as expected for Mediterranean areas. For contrasting the decrease of olive grove’s productivity and improving their mitigation capacity, the same authors pointed out the importance of adopting practices for increasing soil water content and reducing evapotranspiration.

References

  1. Arenas-Castro, S.; Gonçalves, J.F.; Moreno, M.; Villar, R. Projected climate changes are expected to decrease the suitability and production of olive varieties in southern Spain. Sci. Total Environ. 2020, 709, 136161, doi:10.1016/j.scitotenv.2019.136161.
  2. Langgut, D.; Cheddadi, R.; Carrión, J.S.; Cavanagh, M.; Colombaroli, D.; Eastwood, W.J.; Greenberg, R.; Litt, T.; Mercuri, A.M.; Miebach, A.; et al. The origin and spread of olive cultivation in the Mediterranean Basin: The fossil pollen evidence. Holocene 2019, 29, 902–922, doi:10.1177/0959683619826654.
  3. Therios, I.N. Olives; CABI, Oxfordshire, UK, 2009.
  4. Vossen, P. Olive oil: History, production, and characteristics of the world's classic oils. Hortscience 2007, 42, 1093–1100.
  5. EC. Economic Analysis of the Olive Sector; 2012; p. 10. Available online: http://ec.europa.eu/agriculture/olive-oil/economicanalysis_en.pdf.
  6. IOC. International Olive Council statistical series; 2018. Available online: http://www.internationaloliveoil.org (accessed on 7 October 2020).
  7. FAOSTAT. Food and Agriculture Organization of the United Nations Statistical Dataset; FAO: Rome, Italy, 2018.
  8. OliveOilTimes. Olive Oil Production Leaders. Availabe online: https://www.oliveoiltimes.com/olive-oil-production-data (accessed on 5 May 2020).
  9. Caudullo, G.; Welk, E.; San-Miguel-Ayanz, J. Chorological maps for the main European woody species. Data Brief 2017, 12, 662–666, doi:10.1016/j.dib.2017.05.007.
  10. Tous, J.; Romero, A.; Hermoso, J.F. New trends in olive orchard design for continuous mechanical harvesting. Adv. Hortic. Sci. 2010, 24, 43–52.
  11. Loumou, A.; Giourga, C. Olive groves: “The life and identity of the Mediterranean“. Agric. Hum. Values 2003, 20, 87–95, doi:10.1023/A:1022444005336.
  12. Iraldo, F.; Testa, F.; Bartolozzi, I. An application of Life Cycle Assessment (LCA) as a green marketing tool for agricultural products: The case of extra-virgin olive oil in Val di Cornia, Italy. J. Environ. Plan. Manag. 2014, 57, 78–103, doi:10.1080/09640568.2012.735991.
  13. Palese, A.M.; Pergola, M.; Favia, M.; Xiloyannis, C.; Celan, G. A sustainable model for the management of olive orchards located in semi-arid marginal areas: Some remarks and indications for policy makers. Environ. Sci. Policy 2013, 27, 81–90, doi:10.1016/j.envsci.2012.11.001.
  14. Nieto, O.M.; Castro, J.; Fernandez, E.; Smith, P. Simulation of soil organic carbon stocks in a Mediterranean olive grove under different soil-management systems using the RothC model. Soil Use Manag. 2010, 26, 118–125, doi:10.1111/j.1475-2743.2010.00265.x.
  15. Brilli, L.; Gioli, B.; Toscano, P.; Moriondo, M.; Zaldei, A.; Cantini, C.; Ferrise, R.; Bindi, M. Rainfall regimes control C-exchange of Mediterranean olive orchard. Agric. Ecosyst. Environ. 2016, 233, 147–157, doi:10.1016/j.agee.2016.09.006.
  16. Brilli, L.; Lugato, E.; Moriondo, M.; Gioli, B.; Toscano, P.; Zaldei, A.; Leolini, L.; Cantini, C.; Caruso, G.; Gucci, R.; et al. Carbon sequestration capacity and productivity responses of Mediterranean olive groves under future climates and management options. Mitig. Adapt. Strateg. Glob. Chang. 2019, 24, 467–491, doi:10.1007/s11027-018-9824-x.
  17. Nardino, M.; Pernice, F.; Rossi, F.; Georgiadis, T.; Facini, O.; Motisi, A.; Drago, A. Annual and monthly carbon balance in an intensively managed Mediterranean olive orchard. Photosynthetica 2013, 51, 63–74, doi:10.1007/s11099-012-0079-6.
  18. Lorite, I.J.; Gabaldon-Leal, C.; Ruiz-Ramos, M.; Belaj, A.; de la Rosa, R.; Leon, L.; Santos, C. Evaluation of olive response and adaptation strategies to climate change under semi-arid conditions. Agric. Water Manag. 2018, 204, 247–261, doi:10.1016/j.agwat.2018.04.008.
  19. Villalobos, F.J.; Testi, L.; Hidalgo, J.; Pastor, M.; Orgaz, F. Modelling potential growth and yield of olive (Olea europaea L.) canopies. Eur. J. Agron. 2006, 24, 296–303, doi:10.1016/j.eja.2005.10.008.
  20. Connor, D.J.; Fereres, E. The Physiology of Adaptation and Yield Expression in Olive. In Horticultural Reviews; New Jersey, USA, 2005; pp. 155–229, doi:10.1002/9780470650882.ch4.
  21. Moriondo, M.; Ferrise, R.; Trombi, G.; Brilli, L.; Dibari, C.; Bindi, M. Modelling olive trees and grapevines in a changing climate. Environ. Model. Softw. 2015, 72, 387–401, doi:10.1016/j.envsoft.2014.12.016.
  22. Orlandi, F.; Avolio, E.; Bonofiglio, T.; Federico, S.; Romano, B.; Fornaciari, M. Potential shifts in olive flowering according to climate variations in Southern Italy. Meteorol. Appl. 2012, 20, 497–503, doi:10.1002/met.1318.
  23. Kottek, M.; Grieser, J.; Beck, C.; Rudolf, B.; Rubel, F. World map of the Koppen-Geiger climate classification updated. Meteorol. Z. 2006, 15, 259–263, doi:10.1127/0941-2948/2006/0130.
  24. Peel, M.C.; Finlayson, B.L.; McMahon, T.A. Updated world map of the Koppen-Geiger climate classification. Hydrol. Earth Syst. Sci. 2007, 11, 1633–1644.
  25. Moriondo, M.; Trombi, G.; Ferrise, R.; Brandani, G.; Dibari, C.; Ammann, C.M.; Lippi, M.M.; Bindi, M. Olive trees as bio-indicators of climate evolution in the Mediterranean Basin. Glob. Ecol. Biogeogr. 2013, 22, 818–833, doi:10.1111/geb.12061.
  26. Palliotti, A.; Bongi, G. Freezing injury in the olive leaf and effects of mefluidide treatment. J. Hortic. Sci. 1996, 71, 57–63, doi:10.1080/14620316.1996.11515382.
  27. Koubouris, G.C.; Metzidakis, I.T.; Vasilakakis, M.D. Impact of temperature on olive (Olea europaea L.) pollen performance in relation to relative humidity and genotype. Environ. Exp. Bot 2009, 67, 209–214, doi:10.1016/j.envexpbot.2009.06.002.
  28. Mancuso, S.; Azzarello, E. Heat tolerance in olive. Adv. Hortic. Sci. 2002, 16, 125–130.
  29. Fraga, H.; Pinto, J.G.; Santos, J.A. Climate change projections for chilling and heat forcing conditions in European vineyards and olive orchards: A multi-model assessment. Clim. Chang. 2019, 152, 179–193, doi:10.1007/s10584-018-2337-5.
  30. Chuine, I. A unified model for budburst of trees. J. Theor. Biol. 2000, 207, 337–347, doi:10.1006/jtbi.2000.2178.
  31. Osborne, C.P.; Chuine, I.; Viner, D.; Woodward, F.I. Olive phenology as a sensitive indicator of future climatic warming in the Mediterranean. Plant Cell Environ. 2000, 23, 701–710, doi:10.1046/j.1365-3040.2000.00584.x.
  32. Lopez-Bernal, A.; Garcia-Tejera, O.; Testi, L.; Orgaz, F.; Villalobos, F.J. Studying and modelling winter dormancy in olive trees. Agric. For. Meteorol. 2020, 280, 107776, doi:10.1016/j.agrformet.2019.107776.
  33. Ayerza, R.; Sibbett, G.S. Thermal adaptability of olive (Olea europaea L.) to the Arid Chaco of Argentina. Agric. Ecosyst. Environ. 2001, 84, 277–285, doi:10.1016/S0167-8809(00)00260-7.
  34. Rallo, L.; Martin, G.C. The Role of Chilling in Releasing Olive Floral Buds from Dormancy. J. Am. Soc. Hortic. Sci. 1991, 116, 1058–1062, doi:10.21273/Jashs.116.6.1058.
  35. De Melo-Abreu, J.P.; Barranco, D.; Cordeiro, A.M.; Tous, J.; Rogado, B.M.; Villalobos, F.J. Modelling olive flowering date using chilling for dormancy release and thermal time. Agric. Meteorol. 2004, 125, 117–127, doi:10.1016/j.agrformet.2004.02.009.
  36. Gómez, J.A.; Giráldez, J.V.; Fereres, E. Rainfall interception by olive trees in relation to leaf area. Agric. Water Manag. 2001, 49, 65–76, doi:10.1016/S0378-3774(00)00116-5.
  37. Gomez-Rico, A.; Salvador, M.D.; Moriana, A.; Perez, D.; Olmedilla, N.; Ribas, F.; Fregapane, G. Influence of different irrigation strategies in a traditional Cornicabra cv. olive orchard on virgin olive oil composition and quality. Food Chem. 2007, 100, 568–578, doi:10.1016/j.foodchem.2005.09.075.
  38. Ponti, L.; Gutierrez, A.P.; Ruti, P.M.; Dell'Aquila, A. Fine-scale ecological and economic assessment of climate change on olive in the Mediterranean Basin reveals winners and losers. Proc. Natl. Acad. Sci. USA 2014, 111, 5598–5603, doi:10.1073/pnas.1314437111.
  39. Griggs, W.H.; Hartmann, H.T.; Bradley, M.V.; Iwakiri, B.T.; Whisler, J.E. Olive Pollination in California; . California Agricultural Experiment Station, University of California: California, USA, 1975; p 49pp.
  40. Levitus, S.; Antonov, J.; Boyer, T.; Baranova, O.; Garcia, H.; Locarnini, R.; Mishonov, A.; Reagan, J.; Seidov, D.; Yarosh, E.; et al. NCEI ocean heat content, temperature anomalies, salinity anomalies, thermosteric sea level anomalies, halosteric sea level anomalies, and total steric sea level anomalies from 1955 to present calculated from in situ oceanographic subsurface profile data (NCEI Accession 0164586); Version 4.4.; NOAA National Centers for Environmental Information, Washington, USA, 2017; doi:10.7289/V53F4MVP.
  41. King, A.D.; Karoly, D.J.; Henley, B.J. Australian climate extremes at 1.5 °C and 2 °C of global warming. Nat. Clim. Chang. 2017, 7, 412–416, doi:10.1038/Nclimate3296.
  42. Kuglitsch, F.G.; Toreti, A.; Xoplaki, E.; Della-Marta, P.M.; Zerefos, C.S.; Turkes, M.; Luterbacher, J. Heat wave changes in the eastern Mediterranean since 1960. Geophys. Res. Lett. 2010, 37, L04802, doi:10.1029/2009gl041841.
  43. Alexander, L.V. Global observed long-term changes in temperature and precipitation extremes: A review of progress and limitations in IPCC assessments and beyond. Weather Clim. Extrem. 2016, 11, 4–16, doi:10.1016/j.wace.2015.10.007.
  44. Frich, P.; Alexander, L.V.; Della-Marta, P.; Gleason, B.; Haylock, M.; Tank, A.M.G.K.; Peterson, T. Observed coherent changes in climatic extremes during the second half of the twentieth century. Clim. Res. 2002, 19, 193–212, doi:10.3354/cr019193.
  45. Mathbout, S.; Lopez-Bustins, J.A.; Roye, D.; Martin-Vide, J.; Bech, J.; Rodrigo, F.S. Observed Changes in Daily Precipitation Extremes at Annual Timescale Over the Eastern Mediterranean During 1961-2012. Pure Appl. Geophys. 2018, 175, 3875–3890, doi:10.1007/s00024-017-1695-7.
  46. Longobardi, A.; Villani, P. Trend analysis of annual and seasonal rainfall time series in the Mediterranean area. Int. J. Clim. 2010, 30, 1538–1546, doi:10.1002/joc.2001.
  47. Valdes-Abellan, J.; Pardo, M.A.; Tenza-Abril, A.J. Observed precipitation trend changes in the western Mediterranean region. Int. J. Clim. 2017, 37, 1285–1296, doi:10.1002/joc.4984.
  48. IPCC. Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change; Stocker, T.F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S.K., Boschung, J., Nauels, A., Xia, Y., Bex, V., Midgley, P.M., Eds.; Cambridge University Press: Cambridge, UK; New York, NY, USA, 2013; 1535 p.
  49. Denman, K.L.; Brasseur, G.; Chidthaisong, A.; Ciais, P.; Cox, P.M.; Dickinson, R.E.; Hauglustaine, D.; Heinze, C.; Holland, E.; Jacob, D.; et al. Couplings Between Changes in the Climate System and Biogeochemistry. In Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change; Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K.B., Tignor, M., Miller, H.L., Eds.; Cambridge University Press: Cambridge, UK; New York, NY, USA, 2007; pp. 499–587.
  50. Meehl, G.A.; Stocker, T.F.; Collins, W.D.; Friedlingstein, P.; Gaye, A.T.; Gregory, J.M.; Kitoh, A.; Knutti, R.; Murphy, J.M.; Noda, A.; et al. Global Climate Projections. In Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change; Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K.B., Tignor, M., Miller, H.L., Eds.; Cambridge University Press: Cambridge, UK; New York, NY, USA, 2007; pp. 747–845.
  51. Porter, J.R.; Semenov, M.A. Crop responses to climatic variation. Philos. Trans. R. Soc. Lond. B Biol. Sci. 2005, 360, 2021–2035, doi:10.1098/rstb.2005.1752.
  52. Costa, R.; Fraga, H.; Fernandes, P.M.; Santos, J.A. Implications of future bioclimatic shifts on Portuguese forests. Reg. Environ. Chang. 2017, 17, 117–127, doi:10.1007/s10113-016-0980-9.
  53. Fraga, H.; Atauri, I.G.D.; Malheiro, A.C.; Moutinho-Pereira, J.; Santos, J.A. Viticulture in Portugal: A review of recent trends and climate change projections. Oeno One 2017, 51, 61–69, doi:10.20870/oeno-one.2016.0.0.1621.
  54. Fraga, H.; Molitor, D.; Leolini, L.; Santos, J.A. What Is the Impact of Heatwaves on European Viticulture? A Modelling Assessment. Appl. Sci. 2020, 10, 3030.
  55. Farooq, M.; Wahid, A.; Kobayashi, N.; Fujita, D.; Basra, S.M.A. Plant drought stress: Effects, mechanisms and management. Agron. Sustain. Dev. 2009, 29, 185–212, doi:10.1051/agro:2008021.
  56. Bacelar, E.A.; Santos, D.L.; Moutinho-Pereira, J.M.; Lopes, J.I.; Gonçalves, B.C.; Ferreira, T.C.; Correia, C.M. Physiological behaviour, oxidative damage and antioxidative protection of olive trees grown under different irrigation regimes. Plant Soil 2007, 292, 1, doi:10.1007/s11104-006-9088-1.
  57. Fraga, H.; Pinto, J.G.; Santos, J.A. Olive tree irrigation as a climate change adaptation measure in Alentejo, Portugal. Agric. Water Manag. 2020, 237, 106193, doi:10.1016/j.agwat.2020.106193.
  58. Petridis, A.; Therios, I.; Samouris, G.; Koundouras, S.; Giannakoula, A. Effect of water deficit on leaf phenolic composition, gas exchange, oxidative damage and antioxidant activity of four Greek olive (Olea europaea L.) cultivars. Plant Physiol. Biochem. 2012, 60, 1–11, doi:10.1016/j.plaphy.2012.07.014.
  59. Brito, C.; Dinis, L.-T.; Ferreira, H.; Moutinho-Pereira, J.; Correia, C. The role of nighttime water balance on Olea europaea plants subjected to contrasting water regimes. J. Plant Physiol. 2018, 226, 56–63, doi:10.1016/j.jplph.2018.04.004.
  60. Biel, C.; de Herralde, F.; Save, R.; Evans, R.Y. Effects of CO2 Atmospheric Fertilization on Greenhouse Production of Olive Trees (Olea europaea L. ’Arbequina’). Eur. J. Hortic. Sci. 2008, 73, 227–230.
  61. Galán, C.; García-Mozo, H.; Vázquez, L.; Ruiz, L.; de la Guardia, C.D.; Trigo, M.M. Heat requirement for the onset of the Olea europaea L. pollen season in several sites in Andalusia and the effect of the expected future climate change. Int. J. Biometeorol. 2005, 49, 184–188, doi:10.1007/s00484-004-0223-5.
  62. Greven, M.; Neal, S.; Green, S.; Dichio, B.; Clothier, B. The effects of drought on the water use, fruit development and oil yield from young olive trees. Agric. Water Manag. 2009, 96, 1525–1531, doi:10.1016/j.agwat.2009.06.002.
  63. Fernandes-Silva, A.A.; Ferreira, T.C.; Correia, C.M.; Malheiro, A.C.; Villalobos, F.J. Influence of different irrigation regimes on crop yield and water use efficiency of olive. Plant Soil 2010, 333, 35–47, doi:10.1007/s11104-010-0294-5.
  64. Fraga, H.; Pinto, J.G.; Viola, F.; Santos, J.A. Climate change projections for olive yields in the Mediterranean Basin. Int. J. Clim. 2020, 40, 769–781, doi:10.1002/joc.6237.
  65. Quiroga, S.; Iglesias, A. A comparison of the climate risks of cereal, citrus, grapevine and olive production in Spain. Agric. Syst. 2009, 101, 91–100, doi:10.1016/j.agsy.2009.03.006.
  66. Servili, M.; Esposto, S.; Fabiani, R.; Urbani, S.; Taticchi, A.; Mariucci, F.; Selvaggini, R.; Montedoro, G.F. Phenolic compounds in olive oil: Antioxidant, health and organoleptic activities according to their chemical structure. Inflammopharmacology 2009, 17, 76–84, doi:10.1007/s10787-008-8014-y.
  67. Orlandi, F.; Ruga, L.; Romano, B.; Fornaciari, M. Olive flowering as an indicator of local climatic changes. Appl. Climatol. 2005, 81, 169–176, doi:10.1007/s00704-004-0120-1.
  68. Orlandi, F.; Garcia-Mozo, H.; Galán, C.; Romano, B.; de la Guardia, C.D.; Ruiz, L.; del Mar Trigo, M.; Dominguez-Vilches, E.; Fornaciari, M. Olive flowering trends in a large Mediterranean area (Italy and Spain). Int. J. Biometeorol. 2010, 54, 151–163, doi:10.1007/s00484-009-0264-x.
  69. Pérez-López, D.; Ribas, F.; Moriana, A.; Rapoport, H.F.; De Juan, A. Influence of temperature on the growth and development of olive (Olea europaea L.) trees. J. Hortic. Sci. Biotechnol. 2008, 83, 171–176, doi:10.1080/14620316.2008.11512366.
  70. Avolio, E.; Orlandi, F.; Bellecci, C.; Fornaciari, M.; Federico, S. Assessment of the impact of climate change on the olive flowering in Calabria (southern Italy). Theor. Appl. Climatol. 2012, 107, 531–540, doi:10.1007/s00704-011-0500-2.
  71. Dag, A.; Harlev, G.; Lavee, S.; Zipori, I.; Kerem, Z. Optimizing olive harvest time under hot climatic conditions of Jordan Valley, Israel. Eur. J. Lipid Sci. Technol. 2014, 116, 169–176, doi:10.1002/ejlt.201300211.
  72. Gabaldón-Leal, C.; Ruiz-Ramos, M.; de la Rosa, R.; León, L.; Belaj, A.; Rodríguez, A.; Santos, C.; Lorite, I.J. Impact of changes in mean and extreme temperatures caused by climate change on olive flowering in southern Spain. Int. J. Clim. 2017, 37, 940–957, doi:10.1002/joc.5048.
  73. Torres, M.; Pierantozzi, P.; Searles, P.; Rousseaux, M.C.; García-Inza, G.; Miserere, A.; Bodoira, R.; Contreras, C.; Maestri, D. Olive Cultivation in the Southern Hemisphere: Flowering, Water Requirements and Oil Quality Responses to New Crop Environments. Front. Plant. Sci. 2017, 8, 1830, doi:10.3389/fpls.2017.01830.
  74. Iglesias, A.; Garrote, L. Adaptation strategies for agricultural water management under climate change in Europe. Agric. Water Manag. 2015, 155, 113–124, doi:10.1016/j.agwat.2015.03.014.
  75. Brito, C.; Dinis, L.-T.; Moutinho-Pereira, J.; Correia, C.M. Drought Stress Effects and Olive Tree Acclimation under a Changing Climate. Plants 2019, 8, 232.
  76. Arampatzis, G.; Hatzigiannakis, E.; Pisinaras, V.; Kourgialas, N.; Psarras, G.; Kinigopoulou, V.; Panagopoulos, A.; Koubouris, G. Soil water content and olive tree yield responses to soil management, irrigation, and precipitation in a hilly Mediterranean area. J. Water Clim. Chang. 2018, 9, 672–678, doi:10.2166/wcc.2018.224.
  77. Tanasijevic, L.; Todorovic, M.; Pereira, L.S.; Pizzigalli, C.; Lionello, P. Impacts of climate change on olive crop evapotranspiration and irrigation requirements in the Mediterranean region. Agric. Water Manag. 2014, 144, 54–68, doi:10.1016/j.agwat.2014.05.019.
  78. Rodríguez Sousa, A.A.; Barandica, J.M.; Aguilera, P.A.; Rescia, A.J. Examining Potential Environmental Consequences of Climate Change and Other Driving Forces on the Sustainability of Spanish Olive Groves under a Socio-Ecological Approach. Agriculture 2020, 10, 509.
  79. Cabezas, J.M.; Ruiz-Ramos, M.; Soriano, M.A.; Gabaldón-Leal, C.; Santos, C.; Lorite, I.J. Identifying adaptation strategies to climate change for Mediterranean olive orchards using impact response surfaces. Agric. Syst. 2020, 185, 102937, doi:10.1016/j.agsy.2020.102937.
  80. Orlandi, F.; Rojo, J.; Picornell, A.; Oteros, J.; Pérez-Badia, R.; Fornaciari, M. Impact of Climate Change on Olive Crop Production in Italy. Atmosphere 2020, 11, 595.
  81. Scortichini, M. Predisposing Factors for “Olive Quick Decline Syndrome” in Salento (Apulia, Italy). Agronomy 2020, 10, 1445.
  82. Yang, C.Y.; Fraga, H.; Van Ieperen, W.; Santos, J.A. Assessment of irrigated maize yield response to climate change scenarios in Portugal. Agric. Water Manag. 2017, 184, 178–190, doi:10.1016/j.agwat.2017.02.004.
  83. Ainsworth, E.A.; Long, S.P. 30 years of free-air carbon dioxide enrichment (FACE): What have we learned about future crop productivity and its potential for adaptation? Glob. Chang. Biol. 2021, 27, 27–49, doi:10.1111/gcb.15375.
More
Information
Contributor MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
View Times: 2.2K
Revisions: 2 times (View History)
Update Date: 14 Jan 2021
1000/1000
Video Production Service