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Maskell, L.C.; Radbourne, A.; Norton, L.R.; Reinsch, S.; Alison, J.; Bowles, L.; Geudens, K.; Robinson, D.A. Functional Agro-Biodiversity. Encyclopedia. Available online: https://encyclopedia.pub/entry/52120 (accessed on 02 July 2024).
Maskell LC, Radbourne A, Norton LR, Reinsch S, Alison J, Bowles L, et al. Functional Agro-Biodiversity. Encyclopedia. Available at: https://encyclopedia.pub/entry/52120. Accessed July 02, 2024.
Maskell, Lindsay C., Alan Radbourne, Lisa R. Norton, Sabine Reinsch, Jamie Alison, Liz Bowles, Katrien Geudens, David A. Robinson. "Functional Agro-Biodiversity" Encyclopedia, https://encyclopedia.pub/entry/52120 (accessed July 02, 2024).
Maskell, L.C., Radbourne, A., Norton, L.R., Reinsch, S., Alison, J., Bowles, L., Geudens, K., & Robinson, D.A. (2023, November 28). Functional Agro-Biodiversity. In Encyclopedia. https://encyclopedia.pub/entry/52120
Maskell, Lindsay C., et al. "Functional Agro-Biodiversity." Encyclopedia. Web. 28 November, 2023.
Functional Agro-Biodiversity
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This entry is adapted from the peer-reviewed paper 10.3390/land12112078

The European Union’s ‘Green Deal’ proposes an ambitious roadmap towards climate neutrality by 2050 and the adoption of a circular economy. Functional AgroBiodiversity (FAB) measures, which balance food production with minimised impacts on nature, are a promising way to achieve this on farmland.

reduced tillage organic matter input agroforestry reduction in plant protection products

1. Introduction

Over the past 50 years, unprecedented increases in agricultural productivity, driven by economic motivations and technological advances, have led to widespread loss of biodiversity, soil degradation and global environmental change [1][2][3]. Increasing agricultural productivity in a sustainable way without further destroying biodiversity and degrading soils and water bodies, or jeopardising earth’s life support systems, will be critical as moving towards the projected peak in human population of 10.4 billion people during the 2080s [4]. The UN’s sustainable development goals (SDGs) articulate this challenge (https://unstats.un.org/sdgs (accessed on 1 January 2021). The EU’s green deal1 will contribute towards the SDGs, with one vehicle being the new EU missions within Horizon Europe—one of which is in the area of ‘soil health and food’. The ongoing effort through the EU green deal recognises the need for ‘joint action by stakeholders, researchers, policy-makers, industry and citizens working together to co-design, co-create and implement solutions’ (European Union, 2015), which is synonymous with a Functional Agro-Biodiversity (FAB) approach.
Within the European Union, the concept of Functional Agro-Biodiversity emerged alongside the ecosystem services concepts embodied in the Millennium Ecosystem Assessment (MEA) [5]. FAB is defined by the European Learning Network (ELN) as ‘those elements of biodiversity on the scale of agricultural fields or landscapes, which provide ecosystem services that support sustainable agricultural production and can also deliver benefits to the regional and global environment and the public at large’ [6]. It recognises the importance of a range of measures that support both above and below ground biodiversity. The functional component indicates the importance of biodiversity that can enhance ecosystem services, and specifically those ecosystem services that support agriculture [7]. These include the prioritisation of biodiversity that supports biomass production or pest and disease regulation. The FAB approach is a pragmatic one that recognises the need to achieve food production in a way that works with nature, exploiting synergies as far as possible. It seeks to reconcile the often deep rift between conservation and intensive agriculture goals while generating more resilient agricultural production systems [6][8] that use nature where possible over synthetic products.
Whilst Pillar 1 of the EU Common Agricultural Policy (created in 1999) concentrates on direct income support payments to farmers, Pillar 2 has been focused, at least partly, on ensuring the sustainable management of natural resources and climate. This has resulted in the development of agri-environment schemes across the EU, but the quality of natural resources on farmland continues to decline despite these schemes [1]. Evidence is limited on how agri-environment schemes have moderated this decline; the evidence that is available suggests that conservation actions for biodiversity have had mixed effects [9]. Agriculture was responsible for 51% of the total EU water use in 2014, and in 2012 more than 90% of the assessed ‘River Basin Management Plans’ indicated that agriculture was a significant pressure on water bodies. Since farming covers 48% of the land surface area of the EU, agriculture also has an enormous influence over soil resources in arable areas or intensively managed grassland (i.e., through the decline of soil organic matter, soil erosion, soil compaction), while also being heavily dependent on them (i.e., for soil fertility and productivity). Linear intensive practices have resulted in costly degradation [10], indicating an urgent need for alternative land management approaches. Such approaches will need to include increased resource efficiency as part of the transition to a more circular economy; circular agro-ecosystems, which maintain production capacity, circulate products and material, depend less on external inputs, regenerate nature and conserve natural resources, but can also generate a sustainable income for farmers. FAB practises aim to achieve this.
Knowledge regarding the implementation, impact and outcomes of FAB is still highly fragmented and insufficiently embedded in agricultural practice, policy and society [7]. Furthermore, well-optimised FAB ecosystems could be quite different from existing ones, in which key functions are largely underpinned by fossil fuel inputs [11]. It is preferable not to view FAB measures (or agri-environment options) as stand-alone measures, but rather as part of whole-farm or landscape systems approaches delivering at a range of scales, from field to landscape and beyond.

2. Impact of FAB on Nature, Resource Use and Yield

There is an urgent need for increased resource efficiency in farming systems to make the transition to more circular agro-ecosystems, which depend less on external inputs and conserve natural resources (soil, water, biodiversity), especially in the context of climate change. FAB refers to the application of farm management practices that enhance and exploit elements of biodiversity for their role in providing ecosystem services (e.g., pollination, biological pest control, soil erosion control, water retention) and ecosystem functions, and in supporting sustainable agricultural production and human well-being [12][13]. The researchers found that the outcomes of implementing FAB measures were largely positive, with a number of mixed effects. Positive outcomes include improvements in above- and below-ground biodiversity (e.g., [14][15][16][17][18][19][20][21]), improvements in soil structure [22], and the diversity of root architecture that can reduce soil compaction [23][24], improve water conservation and reduce risks of flooding [25]. Many of the measures lead to reductions in fertiliser application [26], which has direct impacts, e.g., on water quality, and indirect impacts, e.g., reductions in GHG from their production. Many of the measures that improve soil erosion also positively benefit water quality. Mixed effects include impacts on GHG emissions, with reductions in some GHGs offset by increased N2O emissions [27][28][29][30][31] or mixed impacts on soil organic carbon (SOC) [32][33]. There are also large uncertainties in some areas (Figure 1), particularly surrounding the impact of FAB measures on yield, with a range of both positive and negative results being reported. This is predominantly due to the metrics, location and timeframe reviewed in each study and complex interactions between management and context. Some effects on yield could be short-term, and the longer-term benefits of a more sustainable system may exceed yield loss with time [34][35][36][37][38][39]. There may be issues with the methods used to calculate yield, e.g., not using a systems approach to calculate productivity in agroforestry [40]. Evidence is also currently limited in other areas (Figure 1); for example, organic matter input and reduced tillage are often implemented to enhance soil quality [34], yet effects on biodiversity are less well studied. There may be negative effects on biodiversity from fertilisation [41], regardless of the source (i.e., organic vs. non-organic), and mixed effects on soil microbial diversity from biochar and biosolids [42].
Land 12 02078 g001
Figure 1. The strength of FAB intervention evidence.

3. Knowledge Gaps, Future Possibilities and Limitations of FAB

Although the possibilities of FAB measures are extensive and many of the core evidence gaps are closing, the impact size, timescale and socio-economic barriers that exist before broad-scale uptake could occur are still significant and need further investigation and testing [7].
The evidence of the magnitude of impact that many of the measures can have upon yield, soil health and water quality over a broad spectrum of space and time is often still lacking (Figure 1). Quantitative evidence for how much of a given intervention is needed to deliver a given benefit is lacking and is also likely to be context-specific [41]. There are knowledge gaps on biodiversity, and studies often focus on selected taxa (e.g., [17][18][37]), perhaps those more easily studied. Often, when an intervention has been implemented for its effect on a different Ecosystem Service, biodiversity impacts may not be as well documented. Cases of success, in particular in farming environments, provide hope for the circular system applicability, yet the evidence in some instances produces conflicting results, possibly due to variance in FAB intervention suitability to an environment (e.g., soil type) or even differences in FAB application or impact monitoring and assessment. It could be that the agricultural matrix is already so degraded (e.g., species pools, soil quality) that it does not have the capacity to recover in the short term or without remedial action [43]. Furthermore, the potential for publication bias in the literature, which tends to report mostly successful trials rather than the negligible or negative results that often never make it to publication, must be noted [40][44][45][46]. This may have an impact when meta-analysis is used to develop the evidence base.
A key step in the successful implementation of FAB measures is the understanding that one intervention alone will not solve all challenges faced, yet a combination of measures implemented in a strategic way can enhance the output success, especially when adopted on a whole farm basis. When implementing several different interventions as a package at farm or field level, the effect of the whole is greater than the sum of the parts [47].
Understanding past land management practices and having access to expertise for measuring impacts is vital to the successful application and effective management of the co-benefits and trade-offs at farm and regional scales (e.g., [34][37][41][48][49][50][51]).
However, beyond the closing of evidence gaps, FAB intervention uptake will continue to be limited unless social and economic barriers are removed [7][24]. For many of the FAB measures investigated here, the financial implications of uptake limit the viability of such options, with the business case to invest in long-term nature-based measures currently not adequately supported. Farmers are often proud of their yields, but it is important to convince farmers to look at profit as the difference between income and expenses. Not only yield is taken in consideration in the economic balance, but also the reduction of costs, like expenses on PPPs, chemical fertilisers and fuel.
Furthermore, education and an improved understanding of the benefits changes in the agricultural system could have at a farm and regional scale is lacking in most cases, limited to small networks rather than incentivised at regional or national governmental level. These and other barriers to implementing FAB measures must be addressed by future policy and transdisciplinary research programs, for which FABulous Farmers is an example [52], and those that will be developed in the future under the European Green Deal.

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Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Lindsay C. Maskell
,
Alan Radbourne
,
Lisa R. Norton
,
Sabine Reinsch
,
Jamie Alison
,
Liz Bowles
,
Katrien Geudens
,
David A. Robinson
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