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d region 【氣象學】 D 區〔離地球表面約60到90公里高度處的電...

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The space - time distribution of chinese semi - ari d region surface water is n ' t even , the differences in a year are obvious ; the differences of underground water between years are not so obvious as surface water , but it still has a decreasing tendency , especially in shanxi and sha ' anxi provinces . there is a significant linear correlation between the precipitation and water resources in semi - arid region , the dynamic regularity of water resources is basically same as the dynamic regularity of precipitation 半干旱地區地表水資源時空分布不均勻,年內分配差別大,地下水資源年際間變化率不大,但總體有減少的趨勢,尤以陜西和山西突出。半干旱地區降水量與水資源量線性相關顯著,降水量的變化規律基本上與水資源量的變化規律吻合。