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Agroforestry in the European common agricultural policy

Agroforestry is a sustainable land management system that should be more strongly promoted in Europe to ensure adequate ecosystem service provision in the old continent (Decision 529/2013) through the common agricultural policy (CAP). The promotion of the woody component in Europe can be appreciated in different sections of the CAP linked to Pillar I (direct payments and Greening) and Pillar II (rural development programs). However, agroforestry is not recognised as such in the CAP, with the exception of the Measure 8.2 of Pillar II. The lack of recognition of agroforestry practices within the different sections of the CAP reduces the impact of CAP activities by overlooking the optimum combinations that would maximise the productivity of land where agroforestry could be promoted, considering both the spatial and temporal scales.


Introduction
practices within Cross-compliance, Pillar I, and Pillar II of the CAP at the EU level for the period 2014-2020.

Materials and methods
The analysis carried out in this paper is based on a literature review of the main CAP legislation framework for Pillar I (Regulation 1307/2013) (EU 2013a) and Pillar II (Regulation 1305/2013) (EU 2013b), as well as the accompanying and transposed legislation, such as Delegated Acts and 88 out of the 118 Rural Development Programs currently existing in the CAP for the period 2014-2020. Different documents and reports presented by the European Commission in the Civil Dialogue Groups and in the European Network for Rural Development from the European Commission web page were also evaluated thanks to the participation of the European Agroforestry Federation (EURAF, www.agroforestry.eu) in the meetings.
The paper analyses how the presence and management of woody vegetation is promoted within the current European CAP framework (period 2014-2020) extending beyond the agroforestry specific measure in Pillar II included in the CAP in 2007. Agroforestry promotion was evaluated in the different sections of the CAP whose fulfillment by farmers is required, such as (i) cross-compliance, whose rules have to be adopted as a prerequisite to get payments linked to Pillar I or Pillar II; (ii) direct payments that include eligibility and Greening measures within the norms required to receive support from Pillar I; and (iii) Pillar II. In all these sections, the CAP allows the selection of activities for implementation by the National Programs, which in turn develop strategies linked to the Partnership Agreement. The selected options may vary or are expanded as the CAP is implemented within a specific commitment period. The evaluation was carried with the available information up to year 2017.

Agroforestry definition
Within the EU, Article 23 of Regulation 1305/2013 (EU 2013b) defines agroforestry systems as "land-use systems in which trees are grown in combination with agriculture on the same land". However, woody perennials are considered by the European Commission in the application of Regulation 1305/2017, where Measure 8.2 (EU 2014) defines agroforestry on agricultural land in the following terms: "Agroforestry means land-use systems and practices where woody perennials are deliberately integrated with crops and/or animals on the same parcel or land management unit without the intention to establish a remaining forest stand. The trees may be arranged as single stems, in rows, or in groups, while grazing may also take place inside parcels (silvoarable agroforestry, silvopastoralism, grazed or intercropped orchards) or on the limits between parcels (hedges, tree lines)". The EU currently indicates that arable land, and therefore agroforestry on such land, is not be eligible for direct payments if it contains more than 100 trees per hectare, as established by Regulation 640/2014 (Mosquera-Losada et al. 2016b), although it allows Member States to select tree densities below this maximum if local practices are implemented on permanent grassland. The focus on woody perennials was also part of the definition for agroforestry as used in the EU-sponsored AGFORWARD research project that ran from 2014 to 2017 (Burgess et al. 2015) and FAO (2017). ICRAF specifies that the concept of 'trees' is linked to woody perennials (therefore, 'trees and shrubs').
Cross-compliance Farmers get paid the direct payments and Greening, as well as Pillar II funds, upon fulfilling the Statutory Mandatory Regulations (SMRs) and Good Agricultural and Environment Conditions (GAECs), generally known as Cross-compliance (conditionality). SMRs refer to EU Directives and Regulations linked to public, animal, and plant health, identification and registration of animals, and environmental and animal welfare. Agroforestry is able to directly fulfill the first three measures (nitrate vulnerable zones and biodiversity dealing with birds and habitats) of the SMRs, but the rest may also be improved by sustainable agroforestry practices (e.g. the quality of feed and food).
The GAECs within the period 2014-2020 currently include options related to water and soil and carbon stocks, where agroforestry can play a role as a sustainable agricultural practice as per GAEC 7, linked to the retention of landscape features. Landscape features include woody vegetation such as hedges and trees in line, in groups, or isolated which are directly related to agroforestry practices, among other features such as ponds, terraces, and field margins . The agroforestry practices linked to GAEC 7 are of high interest in some countries as they avoid problems related to winds or flooding and enhance the biodiversity.

Pillar I Direct payments
CAP establishes three different types of land for the evaluation of their suitability to receive basic payments and Greening through eligibility: arable land, permanent grassland or permanent pasture, and permanent crops.

Arable lands
The eligibility of arable lands is limited by the Delegate Act 640/2014 (EU 2014a) to those lands with a tree density below 100 trees per hectare. This specific constraint makes it difficult for farmers to introduce trees on their arable land, in particular when they own small plots. The conditions for those trees, defined as isolated trees, are provided in the Delegated Act 639/2014 (EU 2014b) as those with a minimum crown diameter of 4 m, which means a tree cover of 1256 m 2 per hectare (12.56%) when considering the 100 trees per hectare rule. If trees are grouped, the maximum area allowed for woody vegetation is even lower, as the CAP allows the 10% of the hectare (1000 m 2 per hectare) to get paid. Regarding hedges or hedgerows, the regulation protects those already existing with a width of up to 10 m (Regulation Act 639/2014 (EU 204b)), but only those with a 2-m width can be claimed as eligible land for payment even if the Member State protects wider hedges (DEFRA 1997 Permanent crops Permanent crops are defined by the Commission as non-rotational crops other than permanent grassland that occupy the land for five years or more and yield repeated harvests, including nurseries and short rotation coppice. For permanent crops, the tree densities set for arable land eligibility do not apply and combinations with crops are allowed. If fruit trees are combined with grazing, this type of land exploits gaps in the silvopasture concept and again, no restrictions on the fruit tree density apply. Permanent crops are those listed in Annex 1 of Regulation 1308/2013, including apple, pear, apricot, peach, nectarines, orange, small citrus, lemon, and olive trees, as well as vineyards for table production as the woody component.

Greening
Greening refers to payments for agricultural practices beneficial for the climate and environment, which, as part of Pillar I payments, represent 30% of the direct payment value received by farmers. Greening, as occurs with cross-compliance, includes landscape features as an option for farmers to fulfill its requirements, but also gives the option of choosing agroforestry. At least one type of landscape feature has been initially selected by 24 Member States; however, this does not imply that trees in line, copses, or isolated trees have been selected, which hampers the evaluation of the impact of the Greening measure. This is because landscape features include other options, such as ponds, terraces, and field margins that are not related to woody vegetation. Moreover, even if countries have made an initial selection, they may not activate it during CAP implementation.
Unfortunately, Greening only affects 40% of the direct payment beneficiaries in Europe, mainly due to the small size of the farms, which receive Greening payments per se. The percentage of the total agricultural area subjected to at least one Greening obligation (crop rotation, permanent grassland preservation, and Ecological Focus Areas) is lower in Southern (Greece, Italy, Malta, or Portugal) than in Northern European countries such as Germany or Latvia. The most selected option of Ecological Focus Areas (EFAs) by the EU Member States is nitrogen-fixing crops (35% to 46%), followed by catch crops (15% to 27%), and fallow land (21% to 35%), which represent 94% of the area fulfilling the EFAs requirements. The selection of any of these three options, among others including agroforestry, is likely due to them being the easiest to implement by farmers. Agroforestry has not been implemented yet and landscape features are only used in around 4.34% of the land claiming Greening support. A greater diversification of the farmers' EFA choices is expected in the forthcoming years and, hopefully, woody vegetation will be more widely used. Table 1 shows the measures promoting the woody component in agricultural land and the agricultural activity linked to the woody component in the evaluated rural development programs of the EU, while Figure 1 presents the number of measures linked to agroforestry implemented in the evaluated EU regions. Most of the CAP 2014-2020 programs were approved during 2015, and thus had only been partially implemented in 2016. To carry out this evaluation, we read the 88 Rural Development Programs (RDPs) implemented in Europe and organised them based on the activities they finance that are linked to agroforestry practices (silvopasture, silvoarable, forest farming, riparian buffer strips, and homegardens). The selected activities include those associated with forest farming agroforestry practices (apiculture), those increasing the woody vegetation across Europe (forest strips and small stands, hedgerows, isolated trees), those dealing with permanent crops of fruit trees (orchards) and, finally, those related to silvopasture (forest understory grazing and mountain silvopastoralism). Twenty three measures have been established in Europe that can be associated with agroforestry within the RDPs framework, but they do not mention agroforestry or any of its practices in a specific way, with the exception of Measure 8.2 out of all the RDPs measures of the CAP 2014-2020. From those, the measure that mostly supports agroforestry is the agri-environment measure (Measure 10.1). Hedgerow (woody component) establishment and management is the most extensively promoted measure linked to agricultural land out of the vast number of measures used across Europe, while meadow orchards have been implemented in most regions by one single measure. The specific agroforestry Measure 8.2 was intended for use in only 33 out of the 88 evaluated regions, a number that will probably increase in the forthcoming years. In the first year, only five RDPs implemented the measure out of the 16 that activated it, mainly through activities related to the establishment and management of forest strips, small stands, hedgerows, and forest grazing.

Discussion
Understanding the impact of the CAP and specifically of agroforestry on European lands is difficult due to several reasons, such as (a) the capacity of countries to choose between different options within the CAP, (b) the variety of options regarding the implementation period, which is typically seven years, (c) the different environmental and socioeconomic situation of the Member States, and (d) the varying number of EU countries implementing the CAP, which has increased in the last years, affording different degrees of adaptation to said policy. The selection of the CAP alternative measures by each Member State delays usually the start of the CAP implementation by one or two years. Member States have to construct their own CAP based on the EU CAP framework and choose among the different alternatives in order to adapt the CAP to their own requirements and environments, which is a really important aspect for agricultural sustainability. Furthermore, accountability as well as modification of the CAP rules is always complicated. Moreover, the CAP selection may be modified by Member States during the commitment period, and it is usually reviewed and strongly modified at mid-term with important changes, making the evaluation of the global period extremely difficult.

Measure code and name, and associated article
Name of sub-measure 1: Knowledge transfer and information actions 1.1 -Support for vocational training and skill acquisition actions 1.2 -Support for demonstration activities and information actions 2. Advisory services, farm management and farm relief services 2.1 -Support to help benefiting from the use of advisory services 2.3 -Support for training of advisors 4. Investment in physical assets 4.1 -Support for investments in agricultural holdings 4.2 -Support for investments in processing/marketing and/or development of agricultural products 4.3 -Support for investments in infrastructure related to development, modernisation or adaptation of agriculture and forestry 4.4 -Support for non-productive investments linked to the achievement of agri-environment-climate 5. Restoring agricultural production potential…and introduction of prevention actions 5.1 -Support for investments in preventive actions aimed at reducing the consequences of probable natural disasters, adverse climatic events and catastrophic events 6. Farm and business Development 6.1 -Business start up aid for young farmers 6.3 -Business start-up aid for development of small farms 7. Basic services and village renewal in rural areas 7.4 -Support for investments in the setting-up, improvement or expansion of local basic services for the rural population including leisure and culture, and the related infrastructure 7.6 -Support for studies/investments associated with the maintenance, restoration and upgrading of the cultural and natural heritage of villages, rural landscapes and high nature value sites including related socio-economic aspects, as well as environmental awareness actions 8. Investments in forest area development and improvements of the viability of forests 8.1 -Support for afforestation/creation of woodland 8.2 -Support for establishment and maintenance of agroforestry systems 8.3 -Support for prevention of damage to forests from forest fires and natural disasters and catastrophic events 8.4 -Support for restoration of damage to forests from forest fires and natural disasters and catastrophic events 8.5 -Support for investments improving the resilience and environmental value of forest ecosystems 8.6 -Support for investments in forestry technologies and in processing, mobilising and marketing of forest products 9. Setting up of producer groups and organisations 9.1 -Setting up of producer groups and organisations in the agriculture and forestry sectors 10. Agri-environment climate 10.1 -Payment for agri-environment-climate commitments 11. Organic farming 11.1 -Payment to convert to organic farming practices and methods 11.2 -Payment to maintain organic farming practices and methods 12.  Regarding the difficulties agroforestry practices present for promotion at the European scale, several deserve to be mentioned in particular. The FAO (2015) define agroforestry as "a collective name for land-use systems and technologies where woody perennials (trees, shrubs, palms, bamboos, etc.) are deliberately used on the same landmanagement units as agricultural crops and/or animals". In North America, AFTA (2016) defines agroforestry as "an intensive land management system that optimizes the benefits from the biological interactions created when trees and/or shrubs are deliberately combined with crops and/or livestock", and USDA (2017) "Agroforestry is the intentional integration of trees and shrubs into crop and animal farming systems to create environmental, economic, and social benefits". The inclusion of 'woody perennials' in the definition of agroforestry in the current CAP (2014-2020) compared to the previous period (CAP 2007(CAP -2013, rather than exclusively 'trees', facilitates the sustainability and adaptation of farming systems to the existing different environments in the EU countries in the form of shrubs owing to their woody perennial nature, providing many of the same productive, environmental, and/or social benefits of trees (Mosquera-Losada et al. 2006;Rigueiro-Rodríguez et al. 2009). Moreover, tree definitions vary across countries, and trees can also be cultivated in shrub form while providing the same environmental and social benefits (Mosquera-Losada et al. 2016a).
The current CAP definition of agroforestry applied in Measure 8.2 is adequate, but we argue that the inclusion of a two-layer concept can help to avoid confusion, for example in the case of using fruit trees when the crop is on the tree. Thus, the AGFORWARD project has proposed the following definition: "the deliberate integration of woody vegetation (trees and/or shrubs) as an upper storey on land with pasture (consumed by animals) or an agricultural crop in the lower storey. The woody species can be evenly or unevenly distributed or occur on the border of plots. The woody species can deliver forestry or agricultural products and other ecosystem services (i.e. provisioning, regulating or cultural)" . Moreover, difficulties exist to clearly identify the different types of agroforestry practices (silvopasture; silvoarable; hedgerows, windbreaks and riparian buffer strips; forest farming, and home gardens) within the Pillar I regulation description, which are typically referred to by local names (e.g. grazed orchards, wood pastures, dehesa, montado, parklands, hedges) but not clearly identified as agroforestry.
Den Herder et al. (2017) and Mosquera-Losada et al. (2016c) which considered exclusively the tree components (excluding shrubs) and woody components (trees + shrubs), respectively, are the first systematic studies to identify the extent and location of agroforestry use and practices in Europe. However due to the lack of data, researchers are not currently able to identify which of these agroforestry practices are linked to CAP payments. The first step to improve the agroforestry policy in Europe is to identify the land where it is applied and how the policy modifies its implementation to create tailor-made agroforestry practice measures according to the needs of specific regions and the ecosystem services they should deliver. Cross-compliance deals with measures for already existing woody components in arable and pasture lands, but not with the enhancement or real promotion of them. The extension of agroforestry practices should be based on a more flexible strategy pursuing the generation of products from woody vegetation while implementing sustainable practices using circular economy and bioeconomy approaches. In general, and when considering the eligibility of an arable land, at present no more than 10% of the arable land is allowed to have an already existing woody component, a number that has been increased from the last CAP 2007-2013, where only a 5% was allowed. However, these rules are still not enough to ensure the productivity and resilience of European arable systems since the tree density does not correlate with the concept of 'mature tree' and most Member States take this density as a limit for any new tree plantation in the European Union. Crown diameters of over 4 m can be considered in most cases mature trees, and trees with diameters smaller than 4 m are not protected even if they are essential to ensure the long term sustainability of isolated trees. The 50 and 100 trees per hectare limit given for arable land in the previous (2007)(2008)(2009)(2010)(2011)(2012)(2013) and current (2014-2020) policies, respectively, have caused the destruction of trees, mostly in small plots of farms, in both already land receiving Pillar I payments and on land that farmers are intending to include for future CAP support. Hedgerows larger than 2 m are not generally considered eligible by the EU, even if they are protected, which makes farmers associate them with a reduction of the CAP support, despite the ecosystem services they deliver, and farmers may reduce their size if not destroy them all together. By contrast, alley cropping or silvoarable practices with short rotation coppices are allowed and fully eligible in the current CAP, but they are not promoted or even specifically mentioned. The woody vegetation of permanent pasture has been protected to some extent in those countries where ELPs are applied. However, some countries have decided not to make eligible pastures dominated by woody vegetation by not widening the ELP options, limiting the positive effect that woody vegetation could have for animal feeding during the drought period of the summer. This may change with the implementation of the OMNIBUS Regulation (European Council) in 2018.
Another aspect that undermines the use of woody vegetation in the CAP is that it does not consider the form and the function of that vegetation; instead the assumption is that the reduction in agricultural activity is solely dependent on the tree density. The tree density criterion has at least three main drawbacks. The first one is that the limiting factor for radiation to reach the understory is not the tree density but the tree coverage, which can nowadays be easily measured using satellite images but that is not considered by the CAP. The second drawback is related to the general assumption that the reduction of radiation necessarily reduces the understory production. In practice, some crops adapt and are more efficient under shade conditions, even increasing their productivity (i.e., the production of the active principle rosmarinic acid extracted from Melisa officinalis L. is increased in the shade because its maximum productivity and quality is linked to the flowering period, which is delayed in the shade, therefore increasing the active principle production per unit of land). In this regard, genetic selection of crop varieties able to remain productive under shade conditions should be developed, as most varieties already existing in the market have been selected for open conditions. The third drawback of the tree density criterion is the lack of a link between the tree density and the temporal dimension. In some areas, such as the dehesa in Spain, the presence of trees in a plot extends the growing season during droughts and extreme heat, and this mitigates the impact of the reduction in solar radiation (Garcia de Jalon et al., 2018). This is important for the adaptation of agricultural systems to climate change (Sciences Vie 2015).
The current permanent pasture definition indeed recognises all types of permanent grasslands across European biogeographic regions better than the previous CAP, in which it was only associated with herbaceous grasslands. Thanks to the inclusion of the concepts of "self-seeded" (annual herbaceous species) and "grasses and other herbaceous forage traditionally not predominant in grazing areas", ecological traits linked to species evolution strategies to survive deficient periods (summer) or disturbances (i.e. heavy rains and floods) are included, making the ecosystems more resilient to droughts and heavy rainfall, and able to avoid erosion. However, when a Member State decides to apply a pro-rata system (meaning that the surface of the woody component in permanent grassland is discounted for farm payments), it is applied to all permanent grassland parcels of the Member State or region territory with scattered ineligible features. This choice means that previously ineligible areas smaller than 1000 m 2 are now eligible; unfortunately, this is applied at the parcel level (not per hectare) and therefore the eligibility depends on the parcel size. Farms with large parcels, even those extending several hectares, are only allowed to have 1000 m 2 of woody vegetation. Another problem for agroforestry is the interpretation of the concept of 'grazable trees' in permanent grassland. As the EU (2015) indicates, 'grazable trees' on permanent grasslands, which are considered part of the eligible area, should not be accounted for when assessing whether the parcel is below or above the maximum tree density. However, the concept of 'grazable trees' for the European Commission refers to those features 'that can be grazed' and should be actually directly accessible to farm animals for grazing of their full area. This implies that the animals must access the food directly from the trees, rendering ineligible and therefore not counting those trees that have been planted in a plot to provide fruit to animals during the fruit drop season (i.e., Quercus ilex in dehesa systems).
Regarding Pillar II, most regions of Europe have activated the promotion of new and/or adequate management of hedgerows and isolated trees with at least one measure. It is important to highlight that the most popular rural development measure (Measure 10.1), the so-called Agri-environment climate commitments (AECMs), recognises the role of woody vegetation in Europe for environmental improvement and the reduction of negative climate change impacts. The lack of recognition of agroforestry in different measures of the CAP, even though the woody component is somehow promoted, reduces the impact of agroforestry practices, since the connection between the crop or pasture and the tree to improve the productivity and the selection of best species or varieties of both components to achieve enhanced productivity in a specific land is not pursued. The visibility of agroforestry should be clear, mostly for the accomplishment of Decision 529/2013 (EU 2013c) regarding the mitigation and adaptation to climate change. However, the specific agroforestry measure (Measure 8.2) has had a low degree of implementation in most European Union regions. Some of the justifications for this fact are: (i) the implementation of agroforestry practices under Measure 8.2 may contribute to the loss of direct payments for specific plots (Mosquera-Losada et al. 2016c), thus stopping farmers from applying them due to the lack of an adequate link between Pillar I and Pillar II; (ii) the lack of knowledge on how to better integrate the woody and agricultural components to increase productivity; (iii) the lack of a market for the woody or agricultural components perhaps linked to an 'agroforestry label', allowing farmers to obtain benefits from such a more sustainable use of the land; and (iv) the lack of payment to farmers for ecosystem services or environmental results.
Nowadays, the EU is aware of the huge existing gap between knowledge and implementation, and has thus created European Innovation Partnerships as a new horizontal approach within the RDPs. A large amount of money has been allocated to operational groups who can undertake different activities where farmers can discuss and develop sustainable practices and within these agroforestry can play an important role. Moreover, the Commission also supports the creation of transnational Focus Groups, where researchers and practitioners are able to discuss specific subjects of interest to the Operational Groups. During 2017, the European Agroforestry Federation supported the Agroforestry Focus Group by providing information, future research directions, and identifying problems that need to be solved to increase the extent and recognition of agroforestry in Europe (Agroforestry Focus Group 2017).

Conclusions
There is clear recognition of the woody component within the CAP but there is minimal overall appreciation of agroforestry. Such a lack of recognition is undermining the flexibility of farmers to pursue the best combinations between the woody component and the agricultural activity from the understory at a range of spatial and temporal scales. We strongly recommend the recognition of agroforestry and agroforestry practices as such through the whole CAP and agroforestry practices that provide wider environmental and social benefit should receive full Pillar I payments on agricultural lands.