文献类型： 外文期刊

作者： Xiao, B. ¹ ; Zhao, Y. -G. ¹ ; Shao, M. -A. ¹ ;

作者机构： 1.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China

2.Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China

3.NW A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China

4.Beijing Acad Agr & Forestry Sci, Beijing Res & Dev Ctr Grasses & Environm, Beijing 100097, Peoples R China

关键词： evaporation process;loess Plateau;sand loam soil;sandy soil

期刊名称：JOURNAL OF ARID ENVIRONMENTS （ 影响因子：2.211； 五年影响因子：2.684 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： It is commonly believed that biological soil crusts may affect soil evaporation rates and consequently relieve or aggravate the shortage of soil water in arid and semiarid regions. However, the effects and mechanisms are largely unclear. In the "wind-water erosion crisscross" region on the Loess Plateau of China (so called because suffering serious water erosion in summer and serious wind erosion in winter) biologically crusted and uncrusted sandy and sand loam soils were sampled and then evaporation processes were measured in sunlight using micro-lysimeters. The results indicated: (1) The evaporation rate of biologically crusted soils was significantly (P < 0.01) decreasing at the beginning of evaporation process and thereafter it was constantly high for a long time. (2) The evaporation process of sandy soil was significantly (P<0.03) affected by biological soil crusts, while that of sand loam soil was not significantly (P > 0.06) affected. This implied that the effects of biological soil crusts on evaporation were dependent on soil properties (mainly soil texture). (3) The evaporation rates of biologically crusted and uncrusted soil can be described by numeric functions (R > 0.88). As a whole, the amount of evaporation was slightly higher on sandy soils and lower on sand loam soils when biological soil crusts were present. It can be concluded that the presence of biological soil crusts would not greatly change soil evaporation in arid and semiarid environments due to the initially decreasing action, balanced by a final increasing effect.