Effects of biological soil crusts on soil water repellency in the Tengger Desert, north central China
Soil water repellency (SWR) is one of the important physical properties of soils occurring all over the world. In this study, the Capillary Rise Method is used to measure the SWR of biological soil crusts (BSCs) in artificial vegetation of Shapotou area, southeast of the Tengger Desert. The results showed that the SWR of two kind BSCs are quite different and are much larger than those of the shifting sand dunes. The SWR of 0-3 cm crusts layer is significantly larger than that of the layer of 3-6 cm. The SWR decreases with increase of the grain size, the discrepancies of SWR between different sieved soil fractions are significant. The SWR is positively correlated to the content of soils with grain size at 0-0.05 mm, 0.05-0.01 mm and 0.01-0.15 mm, while it is negatively correlated to the soils with grain size being exceeding 0.15 mm. The increase of the SWR resulted by the BSCs may have significant potentials to ecological process in the re-vegetated area and further experiments are required to clarify these issues.
Soil water repellency Soil contact angle Capillary Rise Method biological soil crusts
YANG Hao-Tian LIU Li-Chao LI Xiao-Jun GAO Yan-Hong
Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,320 Donggang West Road,Lanzhou 730000,China
国际会议
西安
英文
417-421
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）