The middle reaches of Heihe river is the second largest inland valley in the arid region of northwestern China.
黑河中游是我国西北干旱区开发历史较早，绿洲化程度较高的第二大内陆河流域。
Zhangye district, situated in the middle-reaches of the Heihe river basin, plays a principal part in the economy of whole basin and is the biggest user of water.
位于黑河流域中游的张掖市是整个流域经济的主体，也是流域内用水量最大的地区。
Study on spatial diversification of soil moisture content of oasis and oasis-desert ecotone in the middle reaches of the Heihe River;
本文研究了延安研究区不同立地类型的刺槐林地土壤含水量的变化。
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