MULTI-PURPOSE REGIONAL GEOCHEMICAL SURVEY AND SOIL CARBON RESERVES PROBLEM:EXAMPLES OF JIANGSU,HENAN,SICHUAN,JILIN PROVINCES AND INNER MONGOLIA
多目标区域地球化学调查与土壤碳储量问题——以江苏、湖南、四川、吉林、内蒙古为例

Based on the huge amount of soil carbon data high densely obtained by national multi-purpose regional geochemical survey the concept of unit carbon content was put forward and the measurement calculation method of soil carbon reserves was set up.This provided a new approach to calculate soil carbon reserves accurately and estimate soil carbon pool.Based on the concept of unit carbon content we can calculate soil carbon reserves using regional survey data according to soil type,land use,ecosystem,natural landscape,and any other classification system respectively so as to achieve soil carbon reserves at county,provincial,and national levels,which can be used to solve soil carbon pool problems on land use,agricultural cultivation,and environmental assessment at different levels.This paper lists the calculation results of soil carbon reserves from Jiangsu,Henan,Sichuan,Jilin Provinces and Inner Mongolia.It is clear that soil carbon reserves is in homogenous at the national level.Soil organic carbon reserves in west Sichuan Basin of Sichuan Province is 1779887583t and its average soil organic carbon reserves is 29107.86t/km2.Soil organic carbon reserves and average soil organic carbon reserves in other regions are listed in the following:Jilin Province,2618973357t and 27427.25t/km2;Henan Province,837159672t and 21977.31t/km2;Jiangsu Province,1818603526t and 17117.61t/km2;Inner Mongolia,286247058t and 9592.73t/km2.