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Journal of Agriculture ›› 2021, Vol. 11 ›› Issue (1): 17-21.doi: 10.11923/j.issn.2095-4050.cjas20190800173

Special Issue: 现代农业发展与乡村振兴

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Characteristics of Soil Organic Carbon Fractions of Main Agricultural Soils in Mid-subtropical Areas

Yuan Hong1(), Li Han1, Zhang Liang1, Duan Liangxia1, Huang Yunxiang1, Wang Hui2   

  1. 1College of Resources and Environment, Hunan Agricultural University, Changsha 410128, Hunan, China
    2College of Water Rresources&Civil Engineering, Hunan Agricultural University, Changsha 410128, Hunan, China
  • Received:2019-08-27 Online:2021-01-20 Published:2021-02-05

Abstract:

In main agricultural regions of mid-subtropical zone, to understand soil fertility status, the authors studied the content and accumulation characteristics of soil organic carbon components by field sampling and indoor analysis. The results showed that: the content of organic carbon (SOC) in purple soil was the highest, while the red soil had low organic matter content and the fertility level was not high. The variation tendency of soil easily oxidized organic carbon (EOC) was consistent with SOC. Light fraction organic carbon (LFOC), coarse particulate organic carbon(CPOC), fine particulate organic carbon(FPOC) had the largest proportion in red soil, river tidal soil and rice soil, respectively, which were related to soil parent material and development age. Under different utilizing ways, the content of SOC in tea garden was the highest. The sequence of SOC was tea garden > corn field > rice-rape field > cotton field > vegetable garden. The value of EOC/SOC in tea garden was 36.85%, which indicated that the soil organic carbon was stable. The value of EOC/SOC of other agricultural soils changed a little, ranging from 22.48% to 25.52%, with an average value of 23.44%. LFOC and CPOC were more sensitive to land use change than SOC, and were significantly affected by SOC, CEC, NO3--N and NH4+-N (P<0.01).

Key words: Mid-subtropical Areas, Agricultural Soil, Soil Organic Carbon and Its Fractions, Stability

CLC Number: