Ensuring that farmers' ex ante preferences are accounted for is crucial for the design of effective agri-environmental contracts. We present a systematic review of 127 discrete choice experiment (DCE) studies of farmers' preferences with respect to agri-environmental contracts. DCE studies evaluate two central features of farmers' behaviour: (1) their willingness to accept land use prescriptions, such as fertiliser use, application of pesticides, restrictions on cropping, livestock management, integration of silvopasture, maintaining soil health or water use restrictions; and (2) their responses to variations in incentive and commitment criteria, such as reward schemes, monitoring regimes, technical assistance, flexibility of agreements, administrative burden and collaborative implementation. Our analysis considers how these different elements are interlinked and applied in experiments to simulate farmers' decision-making processes. We examine recent methodological improvements in explaining farmer behaviour, including the accommodation of preference heterogeneity, the combining of discrete (enrolment) and continuous decisions, and the incorporation of farmers' sense of identity. DCEs have been applied for the ex ante analysis of different policy instruments to inform the European Common Agricultural Policy and agri-environmental schemes outside the EU. The results of this systematic review may be useful in informing the future design of such agri-environmental programmes. The database underpinning this systematic literature review may help peer scientists to (a) compare, validate and triangulate their own findings with respect to other experimental approaches, (b) use previous willingness-to-accept (WTA) measures as priors for their own study design, and (c) identify research gaps regarding farmers' preferences for agri-environmental measures.

中文翻译：

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利用农民的事前偏好设计农业环境合同：系统回顾

确保考虑到农民的事前偏好对于设计有效的农业环境合同至关重要。我们对 127 项关于农民对农业环境合同的偏好的离散选择实验 (DCE) 研究进行了系统回顾。 DCE研究评估了农民行为的两个核心特征：（1）他们是否愿意接受土地使用规定，例如化肥使用、杀虫剂使用、种植限制、牲畜管理、林业牧业一体化、保持土壤健康或用水限制； (2) 他们对激励和承诺标准变化的反应，例如奖励计划、监督制度、技术援助、协议的灵活性、行政负担和协作实施。我们的分析考虑了这些不同元素如何相互关联并在实验中应用以模拟农民的决策过程。我们研究了最近在解释农民行为方面的方法论改进，包括适应偏好异质性、离散（入学）和连续决策的结合，以及农民认同感的纳入。 DCE 已应用于不同政策工具的事前分析，为欧洲共同农业政策和欧盟以外的农业环境计划提供信息。本系统审查的结果可能有助于为此类农业环境计划的未来设计提供信息。支持这一系统文献综述的数据库可以帮助同行科学家（a）将他们自己的发现与其他实验方法进行比较、验证和三角测量，（b）使用以前的接受意愿（WTA）测量作为他们自己研究的先验设计，(c) 确定有关农民对农业环境措施偏好的研究差距。