1980-2010年丽水市土壤温度变化特征

利用1980-2010年丽水市国家气象观测站0-20 cm 的5层土壤温度逐月观测资料，采用气候倾向率、Mann-Kendall检验和气候相关性等气候分析统计方法，分析了丽水市土壤温度的时间变化趋势、气候突变及对气候变化的响应。结果表明：丽水市平均土壤温度呈极显著的增温趋势，升温率为0.18 ℃/10 a，其中冬季增温最明显，月变化特征呈单峰分布。土壤温度随深度的增加变化幅度减小，且在时间变化上有一定的滞后性。Mann-Kendall检验表明，丽水市土壤温度处于稳定增长的趋势，其中2004-2009年各层土壤温度增温最显著，通过0.01的显著性检验。丽水市各层土壤温度的突变点，随着深度的增加有所延后，平均土壤温度在1994-1996年发生突变。丽水市土壤温度对气候变化的响应，表现为与气温呈现显著的正相关，与春夏季降水有明显的负相关。

Character of soil temperature from 1980 to 2010 in Lishui, Zhejiang province

 Using the soil temperature data measured in 5 soil layers from 0 to 20 cm underground at weather station in Lishui from 1980 to 2010, the variation trend, abrupt changes of soil temperature and its response to climatic change in Lishui were analyzed in terms of methods of a linear trend analysis, a Mann-Kendall test and a correlation analysis. The results indicate that the annual mean soil temperature is in a significantly increasing trend with the ratio of 0.18 ℃/10 a, especially in winter. There is a peak value for the mean monthly soil temperature in Lishui. The amplitude of soil temperature variation decreases with the increase of the soil depth, and there exists a certain time lag. According to the Mann-Kendall test, the soil temperature is in a stable increasing trend in Lishui, especially from 2004 to 2009 in five soil layers, and it passes the test of 0.01 confidence level. The abrupt change of soil temperature in five soil layers lags with the increase of soil depth. The abrupt change of mean annual soil temperature occurs during 1994-1996. Soil temperature is in a significant positive correlation with air temperature, while it is in a significant negative correlation with spring and summer precipitation in Lishui, which is the response of soil temperature to climate change.