土壤温度是重要的土壤物理性质,其区域分异和季节性变化直接影响着土壤生物的生长发育、繁殖和分布,与农业生产和生态环境紧密相关。本研究根据中国1971—2000年地面气候资料中年均和月均土壤温度、气温和降水数据,分析了我国土壤温度的季节变化及其区域分异特征,并分析了气温和降水对土壤温度的影响。研究表明,我国土壤温度的季节性变化非常明显,土壤温度从春季到夏季变化最大,20℃等温线的纬度跳跃接近25°,而由冬季到春季土壤温度的变化最为缓和。土壤温度的季节变化在不同区域之间存在显著差异;不同区域中土壤温度与气温、降水之间的相关性也各不相同,在温带区域和青藏高原区,气温是土壤温度变化的主要影响因素;在亚热带和热带湿润区土壤温度的季节变化受到气温和降水的共同作用。
Soil temperature is an important soil physical property. Seasonal and regional variations of soil temperature affect growth, propagation and distribution of soil organisms, which are closely related to agriculture and eco-environment. Based on the data of mean monthly soil temperature and air temperature and precipitation in China from 1971 to 2000, seasonal and regional variations of soil temperature in China and impacts of air temperature and precipitation on soil temperature were analyzed. Results indicate that seasonal variation of soil temperature in China was distinct. It was the most distinct from spring to summer, when the 20℃ contour line jumped up beyond 25℃ in latitude from south to north, and the mildest from winter to spring. The seasonal variation differed significantly from region to region. The relationships of soil temperature with air temperature and precipitation also varied with the region. In the temperate zone and the Qinghai-Tibet Plateau, soil temperature was mainly affected by air temperature, while in the tropical and subtropical zones, both air temperature and precipitation contributed to the seasonal variation of soil temperature.