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在土壤侵蚀研究和生产实践中,常常要求对山丘地区坡面上的土壤侵蚀量作出预报,以便采取侵蚀的防患措施。预报土壤侵蚀量的方法,美国曾提出土壤流失预报通用方程,就中将引起土壤侵蚀的所有因子归纳为降雨因子、土壤因子、地形因子、经营管理和保土因子。在这些因子中,除降雨因子外,其它因子的实际值都是根据经验或与标准地块相比而得出的。因此,对于地形不甚复杂、地域较大、研究工作又较为规范化时,才有可能建立土壤流失预报通用方程。但如果地域不大、地形复杂,又还未取得足够的完整资料,建立或应用土壤流失预报通用方程就很困难。然而应用现有径流小区的观测资料,建立回归方程进行山丘坡面土壤侵蚀量预报则是可能
Soil erosion research and production practices often require the prediction of soil erosion on hillslope slopes in order to take measures to prevent erosion. The United States has proposed a general equation for forecasting soil erosion, which summarizes all the factors that cause soil erosion as rainfall, soil, topography, management, and soil conservation factors. Among these factors, the actual values of other factors, except for the rainfall factor, are either empirically or in comparison with the standard plots. Therefore, it is possible to establish general equation of soil loss forecasting when the terrain is not complicated and the geographical area is relatively large and the research work is more standardized. However, if the area is not large and the terrain is complicated and sufficient information is not yet available, it will be very difficult to establish or apply the general equation of soil loss prediction. However, it is possible to predict the amount of soil erosion on the hillslope by using regression data from observed data of existing runoff plots