Effects of topography and land use on the stability of aggregate-associated organic carbon in calcareous soils

摘要：

　　Topography and land use affect soil organic carbon(SOC)storage,stabilization,and turnover,through several biogeochemical processes.This study investigated the aggregate composition and SOC content in bulk soils and aggregates at different slope positions under different land uses in karst regions of southwestern China.Our results showed that the proportion of macro-aggregates and the SOC content of bulk soils and aggregates at different slope positions decreased from the upper to the lower slope.The SOC content generally increased with an increase in the mean weight diameter(MWD)and proportion of macro-aggregates under different land uses.Our results indicate that macro-aggregates in forest and grassland soils make a greater contribution to both aggregate composition and SOC content than that in arable land soils.Therefore,converting farmland to forest or grassland can facilitate the accumulation of macro-aggregates as well as the storage of SOC.

关键词： Soil organic carbon Aggregate fraction Land use Slope position Karst SW China

作者: Man Liu Guilin Han Zichuan Li Taoze Liu Xiaomin Yang Yuntao Wu Zhaoliang Song

作者单位: School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100083,Ch Institute of the Surface-Earth System Science Research,Tianjin University,Tianjin 300072,China The State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of

会议类型: 国际会议

会议名称: The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)

会议地点: 贵阳

会议语种:英文

页码: 1-5

在线出版日期: 2017-06-11（万方平台首次上网日期，不代表论文的发表时间）