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我国北方风沙危害区生态重建与恢复:腾格里沙漠土壤水分与植被承载力的探讨

, PP. 257-266

Keywords: 沙区,植物固沙,人工植被演替,土壤水分动态,植被承载力

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Abstract:

我国北方风沙危害的主要防治区包括贺兰山以东沙地和以西的沙漠、绿洲和沙漠与荒漠草原过渡区,约3.2×105km2.植被重建与恢复是该区遏制风沙危害的重要手段和有效的途径.基于腾格里沙漠沙坡头地区50余年的长期生态学研究,发现重建植被通过对土壤水分的利用和时空再分配改变了原来沙丘系统的水循环特征,在给定的区域降水条件下,土壤水的时空动态与重建植被动态密切相关;指出沙区水文过程的长期改变驱动着人工植被的演替;探讨了降水小于200mm风沙区土壤水分的植被承载力和植物固沙的模式.

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