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中文摘要：
通过植被-枯落物-生物结皮的样方调查，分析植被、枯落物及结皮自身生长状况与结皮退化的关系。结果表明：1）植被盖度和基盖度的变化对生物结皮退化影响较大，而对枯落物下结皮退化度和枯落物下结皮盖度的影响不明显，说明高等植物对植物间空地生物结皮退化的影响不明显；2）生物结皮的自身生长状况与其退化过程的关系不明显，其退化主要是受到其他因素的作用影响；3）枯落物的厚度和盖度是枯落物下结皮退化的重要影响因素，也是影响结皮退化盖度的重要因素。
英文摘要：
This paper studied on influencing factors of soil biological crust degradation in Hilly-gullied Region of Loess Plateau. Based on investigation of vegetation, litters and biological crust, the factors of vegetation and litters as well as biological crust＇ s growths status that related to biological crust degradation was analyzed. The results indicated that： 1 ） The change of vegetation coverage and basal coverage has great influence on the degradation of biological crust, but it has no significant influence on coverage and degraded degree of biological crust degradation underside of the litters. Those showed that biological crust degradation in the interspaces of plants was rarely influenced by living higher plants. 2） The process of biological crust degradation no related to its growth status, it was affected mainly by other factors. 3） Coverage and thickness of litters was important influencing factors to biological crust degradation underside of the litters, and it was also important influencing factors to degradation coverage of biological crust.
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Secondary succession and its effects on soil moisture and nutrition in abandoned old-fields of hilly
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