Spatial Variation of Soil Organic Carbon Pools in Erosion deposition Continuation Landform
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    Abstract:

    Soil erosion and redeposition may result in redistribution of soil carbon in terrestrial systems.However,limited information is available about transfer and redistribution characteristics of various soil organic C in the processes of the erosion and redeposition.A representative erosion deposition landform,consisting of strongly eroded zone,slightly eroded zone,slope depositional zone,and bottom depositional zone,was selected to sample four soil profiles for studying the spatial variation of various organic carbon pools in different landform positions and exploring fate of various organic C in the processes of soil erosion deposition.Results showed that intrinsic characteristics of various organic C greatly affected their transfer and distribution behaviors.Contents of total soil organic C and its components increased in the ascendant order of strongly eroded zone,slightly eroded zone,slope depositional zone,and bottom depositional zone.Total organic C content of soil profiles in the eroded zones decreased significantly along with sampling depth,meanwhile those in depositional areas kept relatively high organic C in all sampling depths,even at the deep layer.Black C is the most mobile form of soil organic C and it tended to be accumulated in the soils in bottom depositional zone of the continuation landform.Because of being buried or physically protected from decomposition in the depositional zones,organic C in the zones was C sink.

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刘兆云,章明奎.侵蚀—沉积连续地形中土壤碳库的空间分异[J].水土保持通报英文版,2009,(3):61-65

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History
  • Received:September 01,2008
  • Revised:November 14,2008
  • Adopted:
  • Online: November 26,2014
  • Published: