RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (03): 476-485.doi: 10.11870/cjlyzyyhj201603015

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SOIL ORGANIC CARBON AND ITS DISTRIBUTION CHARACTERISTICS IN THE SOIL PROFILE UNDER DIFFERENT VEGETATION RECOVERY MODES IN TOUTANG SMALL WATERSHED OF JINSHA RIVER

HE Li-ping, MENG Guang-tao, LI Gui-xiang, LI Pin-rong, CHAI Yong   

  1. Yunnan Academy of Forestry, Kunming 650203, China
  • Received:2015-06-05 Revised:2015-12-23 Online:2016-03-20
  • Supported by:
    The National Scientific and Technological Special Project for Rural Areas Duringthe Twelfth Five-year Plan Period (2012 BAD22B0102)

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Abstract: Field investigation, laboratory analysis and related methods were used to investigate the level of soil organic carbon (SOC) content, organic carbon and organic carbon storage and density distribution of the vegetation under seven different recovery modes in a small watershed of the Jinsha River. The results showed that significant differences exist between the different forest types and soil layers. in terms of the whole soil (0-100cm), SOC of the seven forest typesranged between the average content of 6.46±1.67-24.95±2.32 g·kg-1, with an order of Cryptomeria fortunei forest > Alnus cremastogyne burk forest > Cupressus duclouxiana forest > Quercus variabilis forest > Acacia dealbata forest > Cupressus lusitanica forest > Cupressus torulosa forest, and the difference was significant (p < 0.05); SOC content of the soil in the 7 stands presented a table poly phenomenon, from the surface to the deep soil there was a decreasing trend, and with some regularity; seven kinds of soil bulk density increased gradually with the increase of soil depth on the whole, soil bulk density showed: Cryptomeria fortunei forest > Quercus variabilis forest > Acacia dealbata forest > Cupressus duclouxiana forest > Alnus cremastogyne burk forest > Cupressus lusitanica forest, Cupressus torulosa forest; consistent seven kinds of stands vertical distribution of soil organic carbon density and vertical distribution of soil organic carbon content characteristics, soil depth increases with soil organic carbon density reduced to topsoil 10 cm of soil organic carbon density maximu; organic carbon reserves were as soil depth percentage decreased, while soil organic carbon was mainly concentrated in the 0-40 cm soil, accounting for 65.60% of total organic carbon (Acacia dealbata forest), 63.16% (Alnus cremastogyne burk forest), 54.41% (Cupressus lusitanica forest), 58.56% (Cupressus duclouxiana forest), 62.96% (Cupressus torulosa forest), 61.70% (Quercus variabilis forest) and 56.37% (Cryptomeria fortunei forest),SOC of the 0-40 cm soil layer accounted for more than 50% of the total.

Key words: soil organic carbon, carbon storage, bulk density, vertical distribution, forest types, Jinsha River

CLC Number: 

  • S714.5
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