ABSTRACT:This paper describes our efforts to integrate economic and biophysical models to evaluate the effects agri-environmental policies have on the value of freshwater ecosystem services. We are developing an integrated assessment model (IAM) that links changes in phosphorus-related management practices on farm fields to changes in the value of key freshwater ecosystem services, including biological condition, water clarity, species-specific fish biomasses, and beach algae. Our IAM approach enables examination of the effects of policies and conservation programs on ecosystem services and values. Results will help policy makers allocate conservation dollars to improve water quality, enhance ecosystem services, and promote more sustainable agricultural production. (JEL Q24, Q51)

中文翻译：

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将农业营养污染与淡水生态系统服务的价值联系起来

摘要：本文描述了我们努力整合经济和生物物理模型，以评估农业环境政策对淡水生态系统服务价值的影响。我们正在开发一个综合评估模型 (IAM)，它将农田磷相关管理实践的变化与关键淡水生态系统服务价值的变化联系起来，包括生物条件、水透明度、特定物种鱼类生物量和海滩藻类。我们的 IAM 方法能够检查政策和保护计划对生态系统服务和价值的影响。结果将帮助政策制定者分配保护资金以改善水质、增强生态系统服务并促进更可持续的农业生产。(JEL Q24, Q51)