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有关土壤流失的定量资料是很少的,但这方面的资料却是很必要的,其原因有二: 1.可用于评价比较各种耕作管理制度造成的土壤流失程度。 2.可用于广泛地向农村和城市的居民说明由于土壤侵蚀和流失所遭受的全部经济损失有多大土壤保持服务机构的官员过去都是采用在自然条件下监控径流量和土壤流失的方法来收集土壤流失资料。他们采用的办法包括在服务机构的六个研究中心建立斜坡试验小区以及使用降雨模拟装置。然而在快速估算土壤流失的时候,可以不必使用降雨模拟装
There is very little quantitative information on soil erosion, but information on this is necessary for two reasons: 1. It can be used to evaluate the degree of soil erosion caused by various farming systems. 2. Can be used to broadly inform rural and urban residents of the total economic loss suffered as a result of soil erosion and erosion Officials of soil conservation service agencies have traditionally used methods of monitoring runoff and soil erosion under natural conditions to collect Soil loss information. Their approach includes the establishment of slope test sites at six service centers and the use of rainfall simulators. However, it is not necessary to use rainfall simulations when estimating soil erosion quickly