人类活动对嘉陵江流域泥沙负荷的影响

ANTHROPOGENIC IMPACTS ON THE SEDIMENT LOAD VARIATIONS IN THE JIALING RIVER BASIN

河流泥沙负荷是人类活动影响下侵蚀产沙的重要反映。选择人类活动对嘉陵江流域泥沙负荷变化影响较大的7个表征变量,通过应用SPSS15.0进行通径分析,结果表明:抑制土壤侵蚀的各个因子作用大小依次为:新修塘库、农村劳动力转移、累计治理面积、森林覆盖率、农村用电量、公路通车里程及旱地比例。对嘉陵江河流泥沙负荷减少的直接贡献由大至小分别为:新修塘库、农村劳动力转移、累计治理面积、农村用电量、旱地比例、公路通车里程及森林覆盖率。各影响因子的间接作用由大至小分别为:森林覆盖率、公路通车里程、农村用电量、累计治理面积、旱地比例、农村劳动力转移及新修塘库。

The amount of river sediment load represents an important measure of soil erosion in the context of human activities.Seven factors were selected to indicate the human activities that have significant impacts on the sediment load in the Jialing River Basin.The results from the path analysis by the software SPSS 15.0 showed that the sequences of the general human effects were as follows:reservoir construction,rural labor transfer,cumulative erosion control area,forest cover,rural electro-power consumption,roa...