Plant Nutrition under Climate Change

Plant Nutrition under Climate Change: Comparison

Please note this is a comparison between Version 2 by Bruce Ren and Version 1 by Hassan Ragab El-Ramady.

The climate is one of the key elements impacting several cycles connected to soil and plant systems, as well as plant production, soil quality, and environmental quality. Due to heightened human activity, the rate of CO2 is rising in the atmosphere. Changing climatic conditions (such as temperature, CO2, and precipitation) influence plant nutrition in a range of ways, comprising mineralization, decomposition, leaching, and losing nutrients in the soil.

climate change
elevated CO2
precipitation
plant nutrition

1. Introduction

Human activity elevates the atmospheric levels of greenhouse gases (GHGs), causing the warming of the planet’s surface and a change in the climate [1,2,3]^[1][2][3]. Undoubtedly, climate change (CC) caused by global warming poses significant environmental risks ^[4]. Changes in CO₂ levels in the atmosphere, temperature, and precipitation have a direct effect on agroecosystems (Figure 1), however, agroecosystems also account for almost one-third of overall GHG emissions, owing mostly to N fertilizers, livestock, and rice cultivation, and tropical deforestation [1,2]^[1][2]. There is much discussion over how varied the significance of the CC effects will be in different places throughout the world. The least developed and developing countries in the sub-tropics and tropics are more vulnerable to the adverse effects of CC. Crop productivity in low-income countries is projected to be negatively affected as a result of CC ^[2].

Figure 1. The effect of rising temperature and climate change on agroecosystems.

Carbon is an important element of the primary building block of all living beings for Earth’s life. It may be seen in a variety of forms, the most popular of which is plant biomass. Soil contains around 75% of the total C pool on the ground. As a result, soil is critical to sustaining a balanced global C cycle. Carbon dioxide content has increased by 30% in the atmosphere during the last 150 years ^[5]. The rising CO₂ level of the atmosphere is a result of human activity and is linked to strong and perhaps catastrophic CC. Many solutions for dealing with soil misuse or degradation could help with CC adaptation ^[6]. One strategy proposed for reducing atmospheric CO₂ is to enhance C storage in soils. As a result, there is an urgent need to manage soils and boost their capacity to retain more organic C [5,7]^[5][7]. Preventing and minimizing soil overuse, as well as encouraging sustainable land uses, could improve the fertility of the soil, enhance C stocks in soil and biomass, and help agricultural production and food security. As a result, soil nutrients are preserved and the impacts of climate change are mitigated ^[6].

2. Plant Nutrition under Climate Change

The plant needs some mineral nutrients for optimum growth and development. These nutrients are essential constituents of several macromolecules, which include nucleic acids, phospholipids, specific amino acids, and various co-enzymes, and they play an important role in plants’ cellular metabolism. Furthermore, they aid in chlorophyll production, redox processes, plasma membrane integrity, and cellosmotic potential [12]^[8]. The climate, as a key element of global ecosystems, has had a significant effect on the cycles and processes associated with humans, plants, and animals [13]^[9]. One of the most important elements influencing plant productivity is soil nutrition. Simultaneously, the availability of soil nutrients to plants varies widely among species [14]^[10]. Nutrient availability is vulnerable to CC. However, global warming may modify overall annual and seasonal nutrient availability and cycling [15]^[11]. In particular, variations in C, N, and P availability have serious impacts for plants because they are essential nutrients for plant development. In addition, P has a major effect on water-use efficacy, regulating plant sensitivity to drought stress. These CCs, along with the significant spatial variability of soil nutrients and processes related to changes in habitat quality, result in a complicated scenario that influences soil microbial activity and hence nutrient availability for the plant. In addition, it is becoming increasingly obvious that variations in temperature or precipitation caused by CC change nutrient cycles and, as a result, plant nutrient availability [16]^[12]. Arndal et al. [17]^[13] reported that increased CO₂, rising temperatures, and water stress are key variables that might alter future nutritional demand and availability. The growth of plants has been demonstrated to enhance and boost plant root biomass in many kinds of grassland when CO₂ levels are increased. However, it is unclear whether plants will be able to exchange extra carbon for nutrients as a result of CC. Plant nutrient uptake will be controlled by compensative modifications under high CO₂, and initiation of the mycorrhizal relationship is one of the potential mechanisms for improving nutrient uptake. With CC, nutrient uptake will have to be preserved at current levels and also to be increased owing to the dispersion effect of more C assimilation to preserve nutrient concentrations in agricultural products. There is a functional equilibrium between shoot and root growth to improve a plant’s uptake of nutrients from the soil and atmosphere. The photosynthetic efficiency × leaf weight is correlated to the nutrient uptake × the root weight. If one of the previous four parameters is changed, the balance is changed unless some other parameter is also changed. In non-woody plants, increased CO₂ in the atmosphere stimulates root and shoot development, with root growth exceeding shoot growth. Nevertheless, root growth is only encouraged if N is not a limiting factor [18]^[14]. However, the relationship between plant nutrition and climate change is extremely complicated because climatic circumstances impact all plant growth phases, including development, metabolism, physiology, and plant yields [19]^[15]. Agroecosystems capture water, light, CO₂, and nutrients and use them to make various plant products such as proteins, carbohydrates, and starch. Solar radiation drives the total plant process, which is chemically converted via the photosynthesis process [20]^[16]. Globally, CC is a severe challenge that has simulated the curiosity of the world’s scientific community. The temperature rise caused by numerous human activities is the primary driving force behind CC. It has been observed that the average temperature of the surface of Earth has risen by about 0.9 °C since the late 19th century, with CO₂ that caused by human activities being the primary cause of this rise [21]^[17]. Nonetheless, the CC affects temperature, water availability, and CO₂, which affects the process of plant development and, ultimately, plants’ capacity to efficiently generate the abovementioned items that people require as food [20]^[16]. According to Dotaniya et al. [13]^[9], the overall impact of CC will decrease SOC pools, releasing more CO₂ into the atmosphere, which will act as a positive feedback, increasing CC. As a result, reducing atmospheric global warming gas emissions and improving SOC is a global problem. According to Brouder and Volenec [22]^[18], CC factors including temperature, precipitation (quantityand distribution), and atmospheric CO₂ levels are expected to impact agricultural production patterns over the world. Changing precipitation patterns and greater global temperatures are projected to be connected with increased CO₂ levels, and these variables may diminish or cancel any improvements in output or perhaps lower production below the critical levels. According to Bocchiola et al. [23]^[19], the effects of CC on agriculture may include (1) CO₂ increasing in respiration, primarily for C3 plants, and (2) variations in temperature and rainfall, possibly leading to altered agricultural output over the twenty-first century. However, according to Amouzou et al. [24]^[20], CC and variability threaten crops and food security in some areas. Production systems that are already vulnerable to soil fertility loss have become increasingly vulnerable to rainfall variability and climate change. These pressures will have the greatest effect on resource efficiency in cereal-based agricultural systems like maize (Zea mays) and sorghum (Sorghum bicolor). Brouder and Volenec [22]^[18] emphasized that any possible variations in agricultural productivity may result in related changes in the application of plant nutrients. Local possible productivity is influenced by dominant climate, surrounding CO₂ levels, and crop features; however, this productivity is nearly continually controlled by the resources of the root zone (i.e., water and nutrients) and decreased by diseases and pests. They also emphasized that existing recommendations on nutrient management depend on the recognition of crop-specific requirements to achieve expected production and soil-specific nutrient provisions.

2.1. The Effect of CO₂ Elevation

Elevated CO₂ in the atmosphere has direct and indirect impacts on soil properties and processes via forced alterations in soil water and temperature, in addition to the competing of nutrients [13]^[9]. Investigations on plant response to the elevation of CO₂ may not be representative of the conditions of actual fields in some plant species. There was a drawback in the effectiveness of the experiments of raised CO₂ and temperature for determining their impacts on photosynthesis and other processes of the ecosystem. They attributed this to incorporating short-term sudden variations in elevated CO₂ or temperature in the laboratory or field experiments. These changes rarely generated quantifiable variations in net primary productivity (NPP), C in the ecosystem, or other properties linked to long-standing responses to continuing CC [20]^[16]. Hatfield and Prueger [20]^[16] studied the influence of elevated CO₂ on native grass and cultivated ecosystems and found that understanding the link between CC and plant nutrition may be best accomplished firstly by understanding this interaction in both range and grazing areas. Nitrogen is a limiting element for plant development in certain ecosystems. Terrestrial N exists in organic forms that are unavailable to plants and so the concept of how the response of rangeland to global CC will differ depending on the N cycling rate among the organic and inorganic N molecules being tested. Plant materials or roots that fall to the soil surface are degraded by fauna and microflora in the soil and so become a component of the soil organic matter (SOM) pool. Plant-available N forms and other minerals will be produced during the SOM decomposition stage. Many environmental and plant factors influence the rate of N-release, which is then impacted by CC and CO₂ enrichment.

The interplay between CO₂ and N in cultivated agroecosystems is as complex as it is in native ecosystems. The critical concentration of N for sufficient growth declined in several species when CO₂ concentration increased. Hatfield and Prueger [20]^[16] supposed that one of the essential questions in this context was whether elevating CO₂ concentrations influenced the plant nutrient concentrations. It is proposed that the required amount of N fertilizer in C₃ crops for achieving the greatest productivity under elevated CO₂ concentration would not increase because the critical concentration of N declines in C₃ species with elevating CO₂. On the other hand, in C₄ plants, the required N for achieving maximum production could increase owing to no indication of N decreasing with elevating CO₂. Although they recommended that not all these changes could be specifically attributed to elevating CO₂, CO₂ rising might have been a factor associated with this decline.

Nitrogen is an essential nutrient that influences plant development and physiology. It is also a key component of amino acids, protein, nucleic acids, and chlorophyll, helping to regulate C absorption and metabolism. It is indicated that elevated CO₂ reduces leaf N content, in general, due to the diluting effect. Moreover, the decreased transpiration rate by elevated CO₂ might cause a decrease in mass flow, reducing N absorption with the mass flow. Furthermore, the N concentration in plants may be connected to endogenous abscisic acid concentrations, which are influenced by variations in root development. Furthermore, low leaf N might enhance cytokinin levels under elevated CO₂, encouraging stomatal opening. It is noteworthy that N can impact the accumulation of endogenous abscisic acid and the responses of the stomata to endogenous abscisic acid, thereby influencing the stomatal response to the stress of drought under elevated O₂ growth conditions [8]^[21].

Seneweera and Norton [25]^[22] stated that the response of legumes to elevating CO₂ varies between plant species and may reveal variable degrees of determinacy or the effects of nutrient limitations other than those chosen because of simulated growth. They added that P and Mo have been involved in limiting elevated CO₂ responses in specific situations, though this might be counted as a typical drawback that may become worse if C and N supplies increase. Generally, elevated CO₂ in the atmosphere induced fluctuations in temperature and precipitation, which lead to alterations in the vital soil processes that expose the soils to many kinds of degradation—physio-chemical degradation, salinization, erosion, reduced available water with changes in the soil, declined soil nutrient storage, and depletion of soil biodiversity. Such unfavorable changes pose a big threat to soil productivity, water and soil quality, and production system sustainability [21]^[17].

It was reported that increased CO₂ reduced the levels of other nutrients in edible sections of crops, which were lower than N concentrations, such as Ca, K, Mg, and P. High CO₂ levels have also been demonstrated to reduce plant concentrations of Co, Fe, Mg, Mn, Ni, S, and Zn [18,26,27]^[14][23][24]. However, Wang et al. [28]^[25] reported that although increased CO₂ has a beneficial effect on agricultural productivity, warming has the capacity to negatively affect crop yield by reducing photosynthetic C absorption rates and shortening the growth period of plants. They added that it is unknown how variations in plant growth caused by CO₂ elevation and/or warming impact will make soil micro-nutrients available and accessible to plants (i.e., it is not only controlled by its soil concentration but also by climatic conditions). However, Wang et al. [28]^[25] mentioned that elevated CO₂ and warming together increased the availability of several soil micronutrients like Cu, Fe, and Zn. In addition, these climatic variables had a considerable effect on wheat’s micronutrient uptake and translocation. However, an increase in the availability of soil micronutrients did not necessarily increase micronutrient uptake (which is affected by the element types and crop growth stage).

2.2. The Effect of Temperature

High temperatures result in an increase in CO₂ efflux from the soil. Global warming is lowering the SOC stock by boosting the rate of decomposition and, as a result, the residence time of C in the soil. As a result, soils are expected to be the main source of CO₂ emissions in the future [29]^[26]. The increasing temperature modifies the factor of plant nutrients and different nutrient cycles in nature [13]^[9]. The rising temperature also influences physiological processes such as photosynthesis and respiration. The net impact of CC will vary owing to specific conditions. Therefore, in areas with cold spring and summer periods, where the growing season is short, higher temperatures may improve the crop yields. However, a warmer climate will reduce yields when the temperature increases. Additionally, increasing the temperature can shorten the growth and grain filling periods of the crop. Furthermore, various crop cultivars may display diverse responses to upcoming CC because of different seasons’ lengths [30]^[27]. Arndal et al. [17]^[13] stated that higher temperatures are likely to lengthen the growing season and enhance net mineralization, resulting in increased nutrient availability and perhaps increased uptake. Temperature increases caused by CC, which are both expected and observed to happen at faster rates at higher elevations, are believed to promote soil microbial activity and influence its physiology, resulting in higher levels of N mineralization and decomposing SOM at a quicker pace. This might result in releasing soil nutrients and their availability and decreased nutrient restriction. This happens more at warmer temperatures than colder ones [15,18]^[11][14].

The expected increases in temperature in the 21st century will likely influence the availability of nutrients in terrestrial ecosystems because biological pathways such as SOM decomposition and mineralization and N nitrification generally rise with increasing temperature [31,32]^[28][29]. Soils will be affected by CC through increasing the nutrient leaching rate and soil erosion ^[1], thus increasing nutrient depletion. Lotze-Campe ^[1] explained that higher temperatures affect nutrient conservation because warmer temperatures are possibly increasing the natural decomposition of SOM as a result of microbial activity stimulation. When mineralization is higher than plant uptake, the consequence will be the leaching of nutrients (Figure 2). It largely happens if plant requirements are low and nitrogen mineralization rates increase owing to rising soil temperatures. Wrage et al. [33]^[30] stated that P is an essential element for plant energy and sugar metabolism. Soil P availability is influenced by global CC. The P mineralization in litter tends to rise as temperatures rise. Temperature rises of 0.3 to 6.0 increased interest in mineralization by an average of 48%. Phosphatase exudation and plant P uptake are stimulated by higher levels of N. This might lead to higher soil P availability, which would be boosted further by enhanced P mobilization as a result of human activity. This will limit phytodiversity while promoting the spread of ruderal, fast growing plants [33]^[30].

Figure 2. The effect of CC and rising temperature on SOM decomposition and thus soil nutrients.

Hatfield and Prueger [20]^[16] also reported that increasing temperatures accelerate the decomposition of SOM with much greater impacts in colder areas where minor elevations in temperature may have sensational influences on the decomposition of SOM plus other soil processes. On the other hand, increasing warming will interplay with soil water and increase its evaporation, which may constrain microbial activity. When the soil water becomes limiting, the interplay between temperature and soil water will grow and decomposition will be more reliant on the soil water content and less dependent on temperature. The low soil water content will decline the decomposition rates. Kirschbaum [34]^[31] reported that the temperature dependency of organic matter decomposition is significant in terms of ecophysiology, especially in light of potential CC feedback effects. It largely regulates whether or how much C will be emitted as a result of global warming, as well as the amount to which that C release constitutes a harmful positive feedback effect that results in more warming. Howden and Crimp [35]^[32] stated that climate is the main driver of cropping activities through significant impacts in the crop cycle involving soil moisture, droughts during the grain-filling period, heat damage, frost, and storm damages. Moreover, climate affects nutrient leaching, salt mobilization, and erosion risk. The CC may modify many of these impacts; for instance, the increasing temperature will lead to damage of grain numbers and quality, promoting drought stress and slashing initial soil water conditions. On the contrary, CC may also result in a decline in other hazards like dryland salinization.

2.3. The Effect of Precipitation

Global CC has already resulted in considerable variations in the volume, intensity, duration, and geography of rainfall. In addition, a large increase in the surface air temperature and seasonal patterns with similar or stronger moves are projected in the future [36]^[33]. Although rising temperatures are certain in the future, the projection of precipitation trends is still uncertain [32]^[29]. Precipitation changes and air temperature increases will substantially affect the prevailing temperature and moisture schemes of the root zone. The type and degree of the variations in both factors’ characteristics involve leaf area index and ground litter stores [22]^[18].

The considerable variations in precipitation directly influences the yield, especially in semi-arid and arid climates. Soil water is an essential resource in agriculture. Nutrient absorption is connected to soil water availability, which may be affected by climate change and changing precipitation patterns [37]^[34]. Additionally, nutrient leaching will also be forced by increased precipitation. It is known that intensive rainfall increases soil erosion, which is likely to be higher under CC. An increase of 1% in precipitation is projected to result in a 1.5 to 2% increase in erosion. Intensive rain and transforming from snowing to raining will moreover increase the erosion rate. Plant cover reduces soil erosion rates by weakening rain power (in addition to stabilizing soils by root and reducing sediment transportation by crop residue). Thus, variations in plant biomass can increase those impacts of soil erosion and nutrient leaching. On the other hand, in arid and semiarid climates, dry soil is susceptible to soil erosion across wind and rain ^[1]. Howden and Crimp ^[1] stated that commonly the integrating impacts of expected higher temperatures and decreased in-crop rainfall will lead to lower yields, an increase in the variability of yields, erosion risk, and thus the need for enhanced nutrient and water management. They also added that adaptation options in this regard include several different (separate or combined) levels of response, such as changing inputs (i.e., crop diversities and nutrient management) for matching the dominant climate, altering the amount and improving the proficiency of irrigation water, and more intensive residue and canopy management.

Climatic extremes in precipitation (such as floods and droughts) also cause damage to crop farming, which results in a reduction in the overall farm yields [1,2]^[1][2]. Rosenblatt and Schmitz [38]^[35] mentioned that although the precipitation is not projected to vary regularly over the world as CC continues, a consistent tendency over lots of terrestrial ecosystems is increasing the frequency of droughts, which has already doubled since 1970. Low water potential remains a widespread limiting factor of soil microbial activity (and thus nutrient mineralization) and in extremely dry soils may result in total inhibition in microbial activity. For example, the drought serious effect on mineralization is very distinct at high soil temperatures compared with low ones. Soil microorganisms physiologically respond to drought in many ways, such as a decline in cell osmotic potential, then by dehydration, and ultimately the death of microorganisms. In addition, Arndal et al. [17]^[13] reported that fine roots may dehydrate throughout a drought, reducing nutrient uptake and leading to declining root activity and nutrient mobility.

Generally, the fall of microbial activity in drought circumstances looks to be related to the drying length [32]^[29]. Rosenblatt and Schmitz [38]^[35] added that carbohydrate and protein levels generally increase in drought-stressed plants when osmotic potential decreases, allowing plants to retain more water. Furthermore, when drought stress increases, the relative water content of the leaves declines. However, the impacts of drought on plant nutrition are complex and vary depending on species, development stage, tissue type, drought severity, and length. Table 1 presents some studies that address the influence of climatic conditions on plant nutrition.

Table 1. Effect of climate variables on plant availability and uptake of plant nutrients.

Study Objective	The Effect on Plant	The Ecosystem	Ref.
- Air warming - Shading	With fertilizing		- Investigating the simultaneous responses of biomass, N, and P in plants after five years of fertilizing, air warming, and shading		- Plants significantly responded to fertilizer by increasing N and P uptake (among other effects) - Plants responded little to warming, showing a decrease in N and P - Plants did not respond much to shading		Two plants community predominated by	Cassiope tetragona	(L.)	[39]	^[36]
- Variable rainfall			- Investigating the effects of three opposing climatic scenarios on C, N, and P fractions (among other aims)		- The studied climatic scenario did not influence the nutrient contents in the litter layer - Increased rainfall-induced microbial and plant nutrient uptake and nutrient cycling - Declined rainfall resulted in nutrient accumulation in soil, which increases the nutrient loss risk (by erosion or leaching)		Mediterranean forest, shrubland, and open areas	[16]	^[12]
- Elevated CO₂ - Warming - Drought		Study the root nutrient uptake under predicted climate change		- The root growth increased under the studied climatic variables - N and P uptake did not increase comparably with root growth after 5 years of treatment	Dry heathland/grassland	[17]	^[13]
- CO₂ enrichment - Warming		Investigate the effect of CO	₂	enrichment and warming on the availability and plant uptake of soil micronutrients	- Availability of some micronutrients (Cu, Fe, Mn, and Zn) improved after CO₂ enrichment, while the availability of Cu, Fe, and Zn improved after warming - The uptake of Mn and Zn by wheat was increased by CO₂ enrichment, while the uptake of Cu and Fe was increased by warming			- Paddy field (with rice–wheat rotation) cultivated with wheat at the time of the experiment		[28]	^[25]
- Variable temperature - Snow melt - Other factors		Investigate the effect of environmental conditions on nutrient availability		- The snow melt delay did not change the seasonal soil dynamics of N and P concentrations - At the warmest site, net N mineralization was highest while P was significantly immobilized		- Sub-Arctic catchment		[15]	^[11]
- CO₂ enrichment - Warming		Studying the effect of CO	₂	enrichment and canopy warming on nutrient concentration and accumulation (among other aims)	- CO₂ enrichment decreased N, P, and K concentration and did not change the accumulation of N and P - The warming increased the concentrations of N, P, and K, while it decreased their accumulation			- Rice field (Oryza sativa)		[40]	^[37]
- Predicted warming - Predicted drought	With the pathogen effect	Examining the effect of climatic variables and pathogens on C, N, and P		- Phytophthora cinnamomi pathogen induced mortality in Q. suber trees - Predicted warming and drought may concurrently interact to alter biogeochemical cycles in the soil	Mediterranean forest soil	[41]	^[38]
- Elevated CO₂ with N supply				- Elevated CO₂ decreased the plant N acquisition and major ionic concentrations (NO₃⁻, SO₄²⁻, PO₄³⁻ and Cl⁻) in xylem sap		[42]	^[39]
- Climatic factors with soil factor			- Examining the variation of plant N and P among the desert plant organs and their response to soil and climatic factors.		- Soil factors had direct effects on N and P stoichiometry among organs, while climatic factors had indirect effects		Desert soil	[43]	^[40]
- Elevated atmospheric CO₂ - Elevated temperature			- Examining the individual and combined effect of elevated CO₂ and elevated temperature on tree growth, N mineralization, and N availability, among other aims		- Plant growth was strongly stimulated under elevated CO₂ but not elevated temperature - Available N significantly correlated with plant height - The N mineralization response and nutrient availability to elevated CO₂ and temperature varied with time		Eucalyptus globulus plants	[44]	^[41]

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