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Organic Carbon Storage in Selected Paddy Soils in Taihu Lake Region and Their Occurrence

LI Lian qing, PAN Gen xing, GONG Wei, SUN Yu hua, ZHANG Xu hui (Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University, Nanjing 210095,China)  
Selected 3 types of the paddy soils in Taihu Lake region were sampled.The profile distribution of soil orgamic carbon(SOC) was studied by precision depth sampling technique.Soil aggregates of different size were separated by ultrasonic dispersion followed by sieving,sedimentation and centrifuge,and then their carbon contents were determined respectively.The C lability was analyzed by KMnO 4 oxidation procedure.The stable carbon isotope composition was determined by mass spectrum.The carbon storage of the soils was shown to be 7~10kg C/m 2.The organic carbon was mainly found in the aggregates in size of 2~0.25mm and 0.25~ 0.02 mm.There was hardly difference in carbon lability between the soil types and between the profile layers.The almost constant composition of 13 C in profile depths indicated similar origin of the SOC by the present cropping system predominated by rice and wheat rotations.
【Fund】: 教育部博士点专项研究基金!( BQ970 7);; 江苏省自然科学基金资助项目
【CateGory Index】: S153.6
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