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准确估计未来的土地生产力,对小块土地到国家范围的农业决策和规划来说,都是必要的.水土资源保持法要求1985年以前提出一项关于美国水土资源现状的报告.一个重要的问题是,侵蚀对长期的土壤生产力究竟有什么影响.全国土壤侵蚀——土壤生产力研究规划委员会确定的最紧迫最重要的任务之一是研究出一种模拟侵蚀、作物生产以及有关过程的数学模型——一个为美国确定侵蚀和生产力之间关系的模型.美国农业部农业研究局的一个小组从1981年就开始研究这个模型.EPIC(侵蚀——生产力利用计算机)模型由以物理为基础的成分和经济成分组成.为讨论方便,EPIC的物理成分可以分成7个主要部分——水文学、气象、侵蚀、养料、植物生长、土壤温度和耕作.
Accurate estimation of future land productivity is necessary for small plots of land-based agricultural decision-making and planning across the country, and the Law on Soil and Water Conservation requires a report on the status of land and water resources in the United States by 1985. An important issue Yes, one of the most urgent and important tasks identified by the National Soil Erosion - Soil Productivity Study Planning Board is to develop a mathematical model that simulates erosion, crop production, and related processes - - A model for determining the relationship between erosion and productivity in the United States A team from the Agricultural Research Service of the United States Department of Agriculture has been studying this model since 1981. The EPIC (Erosion-Productivity Computer) model consists of physical-based components and Economic Components For ease of discussion, the physical components of the EPIC can be divided into seven main sections - hydrology, meteorology, erosion, nutrients, plant growth, soil temperature and farming.