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[1]CAO Sheng-kui,CHEN Ke-long,CAO Guang-chao,et al.Influence of Grassland Degradation on the Soil Carbon Density of the Kobresia pygmaea Meadow in the Qinghai Lake Basin[J].Research of Soil and Water Conservation,2014,21(01):71-75.

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Influence of Grassland Degradation on the Soil Carbon Density of the Kobresia pygmaea Meadow in the Qinghai Lake Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 01 Page number: 71-75 Column: Public date: 2014-02-28

Title:: Influence of Grassland Degradation on the Soil Carbon Density of the Kobresia pygmaea Meadow in the Qinghai Lake Basin

Author(s):: CAO Sheng-kui^1,2,3, CHEN Ke-long^1,2, CAO Guang-chao^1,2, ZHU Jin-fu¹, LU Bao-liang⁴, WANG Ji-ming¹; 1. College of Life and Geography Science, Qinghai Normal University, Xi’ning 810008, China;
2. Qinghai Province Key Laboratory of Physical Geography and Environmental Process, Qinghai Normal University, Xining 810008, China;
3. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
4. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xi’ning 810008, China

Keywords:: soil organic carbon density; Kobresia pygmaea meadow; grassland degradation; Qinghai Lake Basin

CLC:: S812.2

DOI:: -

Abstract:: The soil of Kobresia pygmaea meadow in the Qinhai Lake Basin was selected as the studying object, and on the basis of measurement of soil bulk density and organic carbon content under the four different degradation degrees, the soil organic carbon density was determined. Results showed that since the Kobresia pygmaea meadow was gradually degraded, the soil bulk density in the profile presented gradually increasing trend, and soil organic carbon content decreased from the surface, especially soil organic carbon content in the 0—10 cm surface layer. The surface average soil organic carbon content in no degeneration meadow was 6.5 times of severe degeneration one. Variations of soil carbon density similarly behaved with the soil organic carbon concentration in the four different degrading Kobresia pygmaea meadows. The soil carbon densities in the 0—100 cm profile under the four different degrading Kobresia pygmaea meadows respectively were (10.74±3.03), (12.41±4.15), (8.04±6.24), (4.56±0.70) kg/m². That is in the order of slight degrading > no degradation > moderate degradation > severe degradation. This indicated that the soil organic carbon density showed a significant reduction trend along with the Kobresia pygmaea meadows degradation, but slight degradation was helpful to accumulate more organic carbon.

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