1961～2010年广西浅层地温变化特征

Variation Features of Fleet Soil Temperature in Guangxi from 1961 to 2010

土壤温度是重要的土壤物理性质,其变化特征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。利用1961～2010年广西31个气象站0～20 cm各层地温观测资料,运用线性倾向估计、M-K突变检验等方法研究50年来广西浅层地温的变化趋势、气候突变和异常年份等。结果表明:广西各深度年平均地温呈升温趋势,升温突变点为2001年,冬季气候倾向率最大、夏季最小。各深度年平均地温升温率以0 cm最大,10 cm最小。年平均地温除0 cm外均在1984年出现异常偏低,各层年平均地温2009年出现异常偏高。气温升高和降水量减少是影响广西地温上升的主要原因。

Soil temperature,an important physical property of soil,directly affect growth,propagation and distribution of soil organisms,which are closely related to agriculture and ecological environment.Based on the fleet soil temperature data of 0-20 cm in 31 meteorological stations from 1961 to 2010,the variation trend,mutation and anomalous years of fleet soil temperature in Guangxi for the recent 50 years were studied,by using linear-trend estimate and Mann-Kendall catastrophe test.The results showed that annual mean fleet soil temperature was on the rise with the mutation year in 2001.Climate tendency in winter was the most and summer the least.The rate of annual average fleet soil temperature in the depth of 0cm was the biggest,and the least was in the depth of 10cm.Annual mean soil temperature at different depths except 0cm was anomalously lower in 1984.Anomalously higher temperature occurred in 2009 at the shallow levels.The increasing temperature and the decreasing precipitation mainly accounted for the rise of soi1 temperature.