In the mountainous watershed of the Heihe River, the runoff coefficient is much larger than that of the whole arid area, but it is still less than the average value over the whole country.
黑河山区流域径流系数远比干旱内流区的平均值大，但要小于全国的平均径流系数。
Moving to the new 'Yellow River Irrigation area' is a without choice for the farmers in the mountain area; it is actually forced by the arid year after year.
向黄河新灌区搬迁是山里农民无奈的选择，也可以说是被连年的干旱逼出来的。
The wetland in Ganghuang section of Hutuo River is a typical wetland of arid area in north China. The affecting factors can be divided into natural factor and human factor.
滹沱河岗黄段湿地是北方干旱缺水地区典型的河湖湿地，其影响因子可分为自然因子与人为因子。
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