| Dynamic variation of the soil moisture reserve in the source regions of the Yangtze and Yellow Rivers |
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| DOI：10.7606/j.issn.1000-7601.2008.04.05 |
| Key Words: source regions of the Yangtze and Yellow Rivers soil moisture reserve dynamic change precipitation |
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| Abstract: |
| According to 11～17a soil moisture and precipitation data from3stations-observed in the source regions of the Yangtze and Yellow Rivers and based on Sufer8．0 and Excel 2003 technology we made charts of isoline and anomalies of soil moisture reserve （SMR） and analyzed dynamic variation of SMR as well as the correlation relationship between precipitation and SMR．It is found that the soil moisture generally varies from wet to drought and SMR from abundance to lack while along the eastern westward to western of the source regions of Yangtze and Yellow Rivers．Variation of the SMR in the underground 0～50 cm depth shows a character that SMR decreases gradually from surface to depth soil in Gande and Henan but it shows a little value in the surface and depth soil layers and a great amount in the middle layer in Qumalai．Seasonal change of SMR is not apparent in Gande however it is clearly different in two periods of defrost （change at the range of 3 mm） and frozen （change at the range of9mm） in Henan and Qumalai．The character of inter-annuals change in three stations could be divided into three period of time respectively；they are the alternated period of positive and negative before 2000 the negative mean dominant period during the 2000to 2003 and the positive mean period after 2003．Furthermore inter-annuals of SMR in Henan is greatest than two other station in this three stations and least in Gande which indicated the SMR is relatively equable in this area．Our analysis shows a positive correlation between precipitation and the SMR which indicates the SMR is supplied mainly from the atmospheric precipitation in the Source Regions of the Yangtze and Yellow Rivers． |