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利用中国生态系统研究网络(CERN)的17个野外台站2004～2007年的实测土壤表层热通量资料,分析了土壤表层热通量的季节和空间变化规律。土壤热通量从2月份开始由负值转变为正值,9月份左右开始由正值转变为负值,在3～8月份土壤热通量的值都为正值,12月至次年1月土壤热通量都为负值。空间分布上,东北地区和西北地区季节变化明显,年变幅比较大,长江流域地区夏季增加幅度小,年变化幅度也比较小,青藏高原地区四季都相对为低值地区,年变幅比较小,总的空间变化趋势是春夏季北高南低,秋冬季节南高北低。土壤热通量年合计值在东北黑土地地区、西北荒漠地区、黄土高原陕北地区和四川盆地地区是高值区,长江流域下游和黄河流域中下游冲积而成的区域为负值区。研究结果为进一步研究土壤的生态环境形成和变化提供了参考依据。
Based on the measured soil surface heat flux data from 17 field stations of China Ecosystem Research Network (CERN) from 2004 to 2007, the seasonal and spatial variations of surface soil heat fluxes were analyzed. The soil heat flux changed from negative to positive in February and began to change from positive to negative in September and the value of soil heat flux from March to August was positive. Monthly soil heat flux is negative. In the spatial distribution, the seasonal variation in the northeast and northwestern regions is obvious, and the annual amplitude is relatively large. The increase in the summer in the Yangtze River Basin is small and the annual variation range is relatively small. The Qinghai-Tibet Plateau is relatively low in all seasons, and the annual variation is relatively small The total spatial variation trend is that the spring summer is high in the north and low in the north, while the autumn and winter are in the south with high in the north. The annual sum of soil heat flux is negative in the black land area of northeast China, the desert area of northwest China, the northern Shaanxi of the Loess Plateau and the highland area of Sichuan Basin, and the lower reaches of the Yangtze River basin and the middle and lower reaches of the Yellow River Basin. The results provide a reference for further study on the formation and change of the ecological environment of the soil.