中文摘要：

通过对库布齐沙漠不同类型结皮覆盖下不同深度土壤含水量的野外动态监测和室内实验测定,研究了不同类型结皮与土壤水因子的相互影响关系,结果表明：（1）土壤含水量在不同类型结皮影响下,随土层深度的增加,生物结皮表现为先下降后升高的趋势,物理结皮则表现为一直升高的趋势.（2）同一土层土壤含水量差异显示,0~5cm藓结皮和藻结皮与物理结皮土层含水量差异显著（P〈0.05）,而藓结皮和藻结皮土层含水量只在降雨后差异显著（P〈0.05）;5~10cm土层含水量只有藓结皮与物理结皮及降雨后藻结皮与物理结皮差异显著（P〈0.05）;深层土壤含水量差异均不显著.（3）不同类型结皮影响下不同土层土壤水分含量日动态变化受土壤水分蒸发、深层土壤水和大气凝结水补给的影响,均显示8：00~16：00下降、16：00~8：00上升的规律.日变化幅度显示降雨前较小,降雨后明显增大;降雨后表层变幅最大,深层土层变幅最小;表层物理结皮降幅最大,藓结皮升幅最大.（4）生物结皮增加了表层土壤持水力,对深层土壤持水力几乎没有影响.

英文摘要：

The interrelationship between various crusts and soil moisture was investigated by field dynamic monitoring and laboratory analysis of moisture in soil covered by different type of crusts in Hobq desert. The results showed： （1） With the increase of soil depth, the moisture of biological crust decreased at first and then increased,but the moisture of physical crust increased continuously. （2） In the soil layer from 0 to 5 cm,the significant differences of soil moisture between moss crust and physical crust, between algae crust and physical crust and between algae crust and moss crust after raining were recorded. In the soil layer from 5 to 10 cm, there were significant difference of soil moisture between moss crust and physical crust and between algae crust and physical crust after raining. There was no significant difference of soil moisture in the deeper layer. （3） The daily change of moisture in soil covered by different type of crusts had obvious similarities（decline from 8 ： 00 to 16 ： 00 but increase from 16 ： 00 to 8.00, small change range before raining but large after raining）. Furthermore, the daily change range of moisture in the surface soil covered by moss crust was lower than that covered by other crusts during the decreasing period of soil moisture, but higher than that covered by other crusts during the increasing period of soil moisture. （4） Water holding capacity in the surface soil covered by moss crust was higher than that covered by other crusts. There was no significant effect of crust type on water holding capacity in the deeper soil.