通过对沙漠生物结皮层相关的土壤特性研究表明,结皮层不仅具有明显的养分富集和细粒物质的聚集作用,而且结皮层腐殖质成份的含量以及其分子结构和复杂程度也在增加。腐殖质光学特性的变化趋势明显反映了不同地区结皮层土壤发育的地带性特征。结皮层持水量明显高于沙层,并对降水再分配有一定影响。 The study of soil characteristics related to the desert bio-crust showed that the crust not only had obvious enrichment of nutrients and aggregation of fine-grained matter, but also the content of the humus and the molecular structure and complexity of the crust. The changing trend of humus optical characteristics clearly reflects the zonal characteristics of soil development in the crust in different areas. The water holding capacity of crusts was significantly higher than that of sand layers, and had a certain impact on precipitation redistribution.