Biological soil crusts decrease soil temperature in summer and increase soil temperature in winter in semiarid environment
文献类型： 外文期刊
作者： Xiao, Bo 1 ; Wang, Huifang 2 ; Fan, Jun 2 ; Fischer, Thomas 3 ; Veste, Maik 4 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res & Dev Ctr Grass & Environm, Beijing 100097, Peoples R China
2.Chinese Acad Sci, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
3.Brandenburg Tech Univ Cottbus, Fac Environm Sci & Proc Engn, Cent Analyt Lab, D-03046 Cottbus, Germany
4.CEBra Ctr Energy Technol Brandenburg eV, D-03046 Cottbus, Germany
关键词： Moss crust;Hydrological function;Ecological restoration;Desertification control;Loess Plateau of China
期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）
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年卷期：
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收录情况： SCI
摘要： In hot and wet conditions in summer, the biological soil crusts (BSCs) decreased soil temperature by up to 11.8 C, 7,5 °C, 5.4 °C, and 3.2 C at surface, 5 cm, 15 cm, and 30 cm, respectively; while in cold and dry conditions in winter the BSCs increased soil temperature by up to 1.2 C, 1.2 °C, and 1.1 °C at 5 cm, 15 cm, and 30 cm, respectively. The daily mean soil temperatures of the BSCs in a whole year were averagely increased by 0.57 ±0.04°C, 0.31 ±0.04°C, and 0.22 ±0.04°C at 5 cm, 15 cm, and 30cm, respectively. The effects of the BSCs on soil temperature were positively correlated with air temperature and soil moisture, and decreased with soil depth from surface to deep soil. We concluded that BSCs relieved the extreme hot and cold soil micro-environments in desert ecosystem to some extent. Therefore their effects on soil temperature are positive for improving water and nutrient availability and biological community structure, thus decreasing susceptibility to desertification. These results would be helpful for understanding the ecological and hydrological functions of BSCs in semiarid environment.
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