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HISTORICAL CHANGE IN ORGANIC CARBON RESERVE IN TOPSOILS WITHIN THE YANGTZE AND HUAI RIVER DRAINAGE AREAS,ANHUI PROVINCE

JIA Shi-jun,LIANG Hong-xia,XING Run-hua,CHEN Fu-rong(Institute of Geological Survey of Anhui Province,Hefei,Anhui 230001,China)  
Based on the multiple-target regional geochemical survey data of Anhui Province and the second general soil survey data of Anhui Province in 1980,this paper analyzed characteristic change of organic carbon reserve in topsoils within the Yangtze and Huai River drainage areas,Anhui Province,indicating that the reserve of organic carbon increased by 7060228t over 20 years compared with the figure of 1980.The area of carbon sink is 7700km2 more than that of carbon source,so the study area is a carbon sink area as a whole.The carbon source of the carbon reserve in the topsoils thereof substantially distributes along the Yangtze River,and the carbon sink around the watershed between the Yangtze and Huai River,along the Huai River and in the Huibei area.
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