Econ Papers Daily / 期刊论文
作物多样性与农业面积在农业生态系统服务中的相互作用：基于地方水质的分析与实证研究
Interplay of crop diversity and agricultural area in agroecosystem services: Analytical and empirical study on local water quality
摘要
This study expands the framework for analyzing the interplay of agricultural area and crop diversity on agroecosystem services by incorporating the species‐area relationship concept from biology. We estimate panel fixed effects models that include both agricultural area and crop diversity, along with their interaction term. This approach allows us to derive a crop diversity threshold‐the point at which agricultural land no longer exerts a negative marginal effect on water quality, driven by adjustments along the intensive margin rather than the extensive margin. By replicating well‐established water quality models from the literature and conducting robustness checks, we validate this framework. Our results empirically demonstrate that crop diversity can mitigate the adverse impact of agricultural land on water quality, aligning with the goals of conservation programs. This framework provides a more comprehensive understanding of agriculture's non‐unidirectional contributions to water quality, rather than only negative impacts, which are pervasive in the literature. Moreover, the thresholds identified in this study provide valuable insights for prioritizing regions for landscape‐based, crop diversity‐driven conservation strategies and policy design.
中文摘要
本研究通过引入生物学中的物种-面积关系概念，拓展了分析农业面积与作物多样性对农业生态系统服务交互作用的框架。我们估计了包含农业面积、作物多样性及其交互项的面板固定效应模型。这一方法使我们能够推导出作物多样性阈值——即农业用地通过集约边际调整而非粗放边际调整，不再对水质产生负面边际效应的临界点。通过复现文献中成熟的水质模型并进行稳健性检验，我们验证了这一框架的有效性。实证结果表明，作物多样性能够缓解农业用地对水质的负面影响，这与保护项目的目标一致。该框架有助于更全面地理解农业对水质的非单向贡献（而非文献中普遍强调的单一负面影响）。此外，本研究识别的阈值可为优先区域划定提供依据，助力基于景观格局、以作物多样性为导向的保护策略与政策设计。