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土壤侵蚀减少了植物可利用的有效水分,损失了土壤的营养物质,破坏了土壤肥力结构,影响农业耕作制度,从而严重地降低了土壤生产力。土壤侵蚀与土壤生产力关系的模式(EPIC),系统地定量地表达了土壤侵蚀与土壤生产力的相互关系。这个模式包括水文、气象、水蚀和风蚀、氮磷元素、土壤温度、作物生长状况、耕作与作物残茬的处理方法、经济因子和土壤排灌与施肥等9个因子,共36个方程。为了保护和提高土壤生产力,我国需要发展这项研究工作,制定具有中国特色的土壤侵蚀与土壤生产力关系的模式。
Soil erosion reduces the available water available to the plant, loses the soil nutrients, undermines the soil fertility structure and affects the farming system, severely reducing soil productivity. The model of relationship between soil erosion and soil productivity (EPIC) systematically quantitatively expresses the relationship between soil erosion and soil productivity. This model consists of 36 factors, including hydrology, meteorology, water erosion and wind erosion, nitrogen and phosphorus, soil temperature, crop growth status, treatments of tillage and crop residues, economic factors and soil drainage and fertilization. In order to protect and improve soil productivity, our country needs to develop this research work and formulate a model of the relationship between soil erosion and soil productivity with Chinese characteristics.