本文以毛乌素沙区柳湾灌丛草场荒漠化为例，应用植被分类、排序和梯度分析等技术，探讨荒漠化评价的理论和方法。

Salix scrub pasture in Maowusu desert as a case was studied. With the vegetation classification, ordination and gradient analysis, the theory and methods for desertification assessment were discussed.

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因此研究退化湿地土壤的理化性质，不仅有助于我们了解毛乌素沙区湿地退化的原因，还为进一步保护湿地生态系统提供了理论依据。

So, study the physical and chemical properties of degraded wetland soils help to investigate the cause of wetland degraded and provide theoretical basis for wetlands ecosystem protecting.

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毛乌素是我国较大的沙区之一。

Maowusu is one of large sandy areas in our country.

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