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Dynamics of Soil Carbon Fractions and Carbon Stability in Relation to Grassland Degradation in Xinjiang, Northwest China

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Listed:
  • Qiao Xu

    (College of Grassland Science, Xinjiang Agricultural University, Urumqi 830052, China)

  • Yan Wei

    (College of Grassland Science, Xinjiang Agricultural University, Urumqi 830052, China)

  • Xinfeng Zhao

    (Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China)

  • Hailiang Xu

    (Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China)

Abstract

Grassland degradation usually results in significant shifts in vegetation species composition and plant biomass, thus altering the soil organic carbon (SOC) content and stability. Dynamics of labile carbon fractions after grassland degradation were well addressed; however, the changes in stable carbon fractions were poorly quantified. Soil samples at 0–10 cm and 10–20 cm depth were collected from a native grassland (NA), a lightly degraded grassland (LD), a moderately degraded grassland (MD), and a severely degraded grassland (SD) in northwest China to assess the influence of grassland degradation on the total SOC content, four SOC fractions (very labile carbon, CF1; labile carbon, CF2; less labile carbon, CF3; non-labile carbon, CF4), and SOC stability. Compared with the NA, the contents under LD, MD, and SD at 0–20 cm depth reduced by 20.58%, 29.22%, and 64.58% for total SOC, 21.38%, 23.00%, and 63.66% for CF1, 13.81%, 20.58%, and 62.26% for CF2, 24.30%, 35.05%, and 68.63% for CF3, and 22.17%, 38.80%, and 63.82% for CF4, respectively. The linear relationships between the total SOC and the four fractions of CF1, CF2, CF3, and CF4 were significant in this study. The lability index of SOC under the NA, LD, MD, and SD was 1.57, 1.59, 1.67, and 1.57, respectively, and no significant difference was found among the four grasslands. To conclude, grassland degradation changes the contents of total SOC and its labile and stable fractions but did not change the SOC stability in northwest China.

Suggested Citation

  • Qiao Xu & Yan Wei & Xinfeng Zhao & Hailiang Xu, 2022. "Dynamics of Soil Carbon Fractions and Carbon Stability in Relation to Grassland Degradation in Xinjiang, Northwest China," Sustainability, MDPI, vol. 14(10), pages 1-11, May.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:10:p:5860-:d:813979
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    References listed on IDEAS

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    1. Yi Yang & David Tilman & George Furey & Clarence Lehman, 2019. "Soil carbon sequestration accelerated by restoration of grassland biodiversity," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    2. Xiaoni You & Xiangying Li & Mika Sillanpää & Rong Wang & Chengyong Wu & Qiangqiang Xu, 2022. "Export of Dissolved Organic Carbon from the Source Region of Yangtze River in the Tibetan Plateau," Sustainability, MDPI, vol. 14(4), pages 1-17, February.
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