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为保持土壤生产力而控制侵蚀和为保护水质极度衰减而控制产沙量,以选择最合适的生产措施,必需按农田分类面积估算侵蚀量和产沙量.如果当地保护水质的容许产沙量被确定,则根据农田的特殊条件、农民的需要及容许田面径流量,需要一个计算模式选择合适的生产措施.
Erosion and sediment yield must be estimated by cropland classification area in order to maintain soil productivity, control erosion and control sediment yield to protect water quality in order to select the most appropriate production measures. If the allowable sediment yield for local protection of water quality is To determine, according to the special conditions of farmland, farmers’ needs and allowable surface runoff, a calculation mode is needed to select suitable production measures.