通过数学模型定量的计算了大沙河流域人类活动对泥沙输移减少的贡献率平均为65.6%，而同期径流和降雨对泥沙减少的贡献率平均则为34.4%。
The average contributive ratio affecting soil erosion by human activities is 65.6%, and at the same period the contributive ratio by runoff and rainfall is 34.4%.
在各污染因子中COD、BOD5、挥发酚类对河流水质的贡献率较大。由此分析了相应的原因。
It also showed that in each pollution factor, COD, BOD5 and the votile phenol contributed much more to the water quality of this river. Thus corresponding reason was analyzed.
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