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衡量一个小流域治理所得到的成效,可以通过该小流域环境容量的提高来表示。在规划时,可根据情况确定环境容量的指标水平,以各项措施来保证指标水平的实现。 至于环境容量的计算,按《中国水土保持》1988年第2期“方家河小流域治理效益分析”一文所介绍的公式: K=At/Ad式中K—环境容量,人/平方公里,At—总宜耕地面积,亩/平方公里,Ad—人均粮食消费量所需的人均耕地面积,人/亩。Ad=D/Y,其中D—规划(实际)水平的人均粮食消费量,公斤,Y—多年平均粮食亩产量,公斤。
Measuring the effectiveness of a small watershed governance can be expressed through the improvement of the environmental capacity of the small watershed. In planning, according to the situation to determine the level of indicators of environmental capacity, with various measures to ensure the achievement of the level of indicators. As for the calculation of the environmental capacity, according to the formula introduced in “Analysis of Benefit of Fangjiahe Small Watershed Management” of “Soil and Water Conservation in China” No. 2 of 1988: K = At / Ad where K-environment capacity, At-total area of arable land, mu / km 2, Ad- per capita arable land required for food consumption, person / mu. Ad = D / Y, where D is the planned (actual) level of per capita consumption of food, kg, Y - annual average grain yield, kg.