【摘要】 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。更多还原

【Abstract】 Some soil properties related to desert biological crust were studied.The results showed that there were both of obvious nutrient accumulation and fine size fraction enrichment in the crust.Furthermore,humus content increased as well as molecular structure became more complicated.Changes of humus optical characteristics reflected the crust zonality fenture in different regions.The water holding capacity of the crust layer was obviously higher than that of the original sand layer.This could affect the redistribution of rain water.更多还原