Long Term Trends of Soil Moisture and Temperature Change in East China in Relationship with Climate Background
Received date: 2008-10-13
Revised date: 2008-12-18
Online published: 2009-02-10
Based on the data of monthly mean soil temperature from 722 stations over 1971-2000 and soil moisture observations from 178 agrometeorological stations during 1981-1998, the long term trends of soil temperature and soil moisture in East China and their relationship with the change of surface air temperature and precipitation are analyzed. The results indicate that: (1) There are obvious regional differences in the variation of soil temperature in East China The soil temperature change in Northeast China displays an increasing trend, while in the other parts of East China, such as North China, the Yangtse-Huaihe river Valley and Southwest-South China, the soil temperature change shows a trend of from dropping at first to rising afterwards. (2) From the 1970s to the 1990s, the soil temperature change in Northeast China and North China displays an increasing trend. However, the trend of soil temperature change in the Yangtse-Huaihe River Valley and Southwest-South China is not obvious in general. Generally, from 1981 to 1998, the trends of soil moisture are not obvious in each subregion. (3) From inter-annual to inter-decadal timescales, there is an evident positive correlation between the soil temperature and surface air temperature in all parts of East China. Meanwhile, soil moisture is positively correlated with precipitation, and negatively correlated with soil temperature. The negative correlation of soil temperature and soil moisture in North China is most notable.
WANG Xiaoting , ZHONG Zhong , CUI Xiaoyan , GUO Weidong . Long Term Trends of Soil Moisture and Temperature Change in East China in Relationship with Climate Background[J]. Advances in Earth Science, 2009 , 24(2) : 181 -191 . DOI: 10.11867/j.issn.1001-8166.2009.02.0181
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