Organic carbon stock in topsoil of Jiangsu Province, China, and the recent trend of carbon sequestration
  • 【DOI】

    10.3321/j.issn:1001-0742.2005.01.001

  • 【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... 展开>>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 · 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. 收起<<

  • 【作者】

  • 【作者单位】

    Institute of Resources/Extension Center of Soil and Fertilizer Technology/Extension Center of Soil and Fertilizer Technology/Extension Center of Soil and Fertilizer Technology/Extension Center of Soil and Fertilizer Technology

  • 【刊期】

    环境科学学报(英文版) ISTIC SCI 2005年1期

  • 【关键词】

    soil organic carbon  soil carbon stock  agricultural practice  carbon sequestration  paddy soil  China 

  • 【基金项目】

    国家自然科学基金