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

第一作者: Xiao, Bo

作者: Xiao, Bo;Xiao, Bo;Wang, Huifang;Fan, Jun;Fischer, Thomas;Veste, Maik

作者机构:

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 )

ISSN:

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.

分类号: Q14`X171

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