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Organic carbon stock in topsoil of Jiangsu Province, China, and the recent trend of carbon sequestration
作者姓名:PAN Gen-xing  LI Lian-qing  ZHANG Qi  WANG Xu-kui  SUN Xing-bin  XU Xiao-bo  JIANG Ding-an
作者单位:[1]InstituteofResources,EcosystemandEnvironmentofAgriculture,NanjingAgriculturalUniversity,Nanjing210095,China [2]ExtensionCenterofSoilandFertilizerTechnology,DepartmentofAgriculture,JiangsuAdministration,Nanjing210000,China [3]ExtensionCenterofSoilandFertilizerTechnology,Donghai222300,China [4]ExtensionCenterofSoilandFertilizerTechnology,Wujiang215200,China [5]ExtensionCenterofSoilandFertilizerTechnology,Yixing214200,China
基金项目:TheNationalNaturalScienceFoundationofChina(No.40231016,40171052)
摘    要:Data collection of soil organic carbon(SOC) of 154 soil series of Jiangsu, China from the second provincial soil survey and of recent changes in SOC from a number of field pilot experiments across the province were collected. Statistical analysis of SOC contents and soil properties related to organic carbon storage were performed. The provincial total topsoil SOC stock was estimated to be O. 1 Pg with an extended pool of 0.4 Pg taking soil depth of 1 m, being relatively small compared to its total land area of lOl?00 km^2. One quarter of this topsoil stock was found in the soils of the Taihu Lake region that occupied 1/6 of the provincial arable area. Paddy soils accounted for over 50% of this stock in terms of SOC distribution among the soil types in the province. Experimental data from experimental farms widely distributed in the province showed that SOC storage increased consistently over the last 20 years despite a previously reported decreasing tendency during the period between 1950--1970. The evidence indicated that agricultural management practices such as irrigation, straw return and rotation of upland crops with rice or wheat crops contributed significantly to the increase in SOC storage. The annual carbon sequestration rate in the soils was in the range of 0.3-3.5 tC/(hm^2. a), depending on cropping systems and other agricultural practices. Thus, the agricultural production in the province, despite the high input, could serve as one of the practical methods to mitigate the increasing air CO2.

关 键 词:有机碳  江苏  中国  SOC  土壤  水稻土  分析方法
收稿时间:2004/2/12 0:00:00
修稿时间:2004/6/30 0:00:00

Organic carbon stock in topsoil of Jiangsu Province, China, and the recent trend of carbon sequestration
PAN Gen-xing,LI Lian-qing,ZHANG Qi,WANG Xu-kui,SUN Xing-bin,XU Xiao-bo,JIANG Ding-an.Organic carbon stock in topsoil of Jiangsu Province, China, and the recent trend of carbon sequestration[J].Journal of Environmental Sciences,2005,17(1):1-7.
Authors:PAN Gen-xing  LI Lian-qing  ZHANG Qi  WANG Xu-kui  SUN Xing-bin  XU Xiao-bo and JIANG Ding-an
Institution:1. Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
2. Extension Center of Soil and Fertilizer Technology, Department of Agriculture, Jiangsu Administration, Nanjing 210000, China
3. Extension Center of Soil and Fertilizer Technology, Donghai 222300, China
4. Extension Center of Soil and Fertilizer Technology, Wujiang 215200,China
5. Extension Center of Soil and Fertilizer Technology, Yixing 214200, China
Abstract:Data collection of soil organic carbon(SOC) of 154 soil series of Jiangsu, China from the second provincial soil survey and of recent changes in SOC from a number of field pilot experiments across the province were collected. Statistical analysis of SOC contents and soil properties related to organic carbon storage were performed. The provincial total topsoil SOC stock was estimated to be 0.1 Pg with an extended pool of 0.4 Pg taking soil depth of 1 m, being relatively small compared to its total land area of 101700 km2 . One quarter of this topsoil stock was found in the soils of the Taihu Lake region that occupied 1/6 of the provincial arable area. Paddy soils accounted for over 50% of this stock in terms of SOC distribution among the soil types in the province. Experimental data from experimental farms widely distributed in the province showed that SOC storage increased consistently over the last 20 years despite a previously reported decreasing tendency during the period between 1950--1970. The evidence indicated that agricultural management practices such as irrigation, straw return and rotation of upland crops with rice or wheat crops contributed significantly to the increase in SOC storage. The annual carbon sequestration rate in the soils was in the range of 0.3-3.5 tC/(hm2 x a), depending on cropping systems and other agricultural practices. Thus, the agricultural production in the province, despite the high input, could serve as one of the practical methods to mitigate the increasing air CO2.
Keywords:soil organic carbon  soil carbon stock  agricultural practice  carbon sequestration  paddy soil  China
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