乌兰布和沙漠流动沙地土壤水分动态、土壤水势特征的研究

通过对乌兰布和沙漠流动沙地土壤水分动态的研究表明:沙土含水量的时空变化与降雨季节和降雨量有密切关系。100mm左右的降雨量对沙地和丘间地的影响深度主要在60cm左右,因此0-60cm土层为土壤水分受降雨影响的活跃层;通过对土壤含水量与土壤水势的关系研究表明:在相同土壤含水量下沙土水分对植物的有效性远大于粘土;通过降雨量对沙地贮水量影响的研究表明:只有38%左右的降雨量增加了土壤贮水量,其余62%被蒸散。

Studies on the Soil Water Dynamic and the Characteristics of Soil Water Potential in the Drifting Sand Dunes in Wulanbuhe Desert

The study showed that the water in the sand soil was related to the spatio-temporal changes\, rainy season and rainfall through researching on the soil water dynamicsin the drififting sand dune in Wulanbuhe desert. The depth of soil that rainfall(about 100mm) affected was about 60cm on the sandy soil and the lowland between sandy dunes.Therefore the soil moisture layer was mainly influenced by the rainfall distributed between 0cm and 60cm deep. The study on the relation between the soil moisture and water potential also indicated that sandy soil moisture had larger effect on the vegetationthan the clay's. The research on how the rainfall affected the stored-capability of the sandy soil demonstrated that only 38% of rainfall can be absorbed by the soil, the rest of rainfall was evaporated.