The second chapter discusses the selection of the study area, giving definition of the oasis and desert ecotone in theinvestigated zone, .
第二章分为研究区的选择，绿洲—荒漠交错带的确定；
Along the gradient zone of ecotone between oasis and desert, 3 zones can be divided clearly by the change of soil water content.
在绿洲至流动沙丘这一环境梯度带，其水分变化可以明显划分为3个区间。
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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