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最近设计出了侵蚀影响生产力的计算公式.这一数学模式,用于判定美国的土壤侵蚀与生产力之间的关系.为了完成这一课题,在模式推导过程中确立了四个标准.这个模式必须达到:(a)切合实际,能够模拟同时发生的所有过程,并真实而迅速地使用输入信息;(b)如果需要的话,可以模拟几百年的侵蚀过程,因为侵蚀是一个十分缓慢的过程;(c)能够广泛地应用在美国境内的各种土壤、气候和栽培条件下;(d)有效实用,使用方便,且能够估测管理上的变化对侵蚀与土壤生产力的影响.
Recently, a formula for calculating erosion-affecting productivity has been devised, a mathematical model used to determine the relationship between soil erosion and productivity in the United States.4 In order to accomplish this task, four criteria have been established in the model derivation process, which must Achieve: (a) Practicable to be able to simulate all processes occurring at the same time and to use the input information in a real and rapid manner; (b) Erosion processes can be simulated for hundreds of years, if needed, as erosion is a very slow process; (c) Can be widely used in a variety of soils, climates and growing conditions in the United States; (d) It is practical, easy to use and able to assess the impact of regulatory changes on erosion and soil productivity.