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Contribution of Fine Roots to Soil Organic Carbon Accumulation in Different Desert Communities in the Sangong River Basin

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  • Sihui Tian

    (College of Animal Science, Guizhou University, Guiyang 550025, China
    State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)

  • Xin Liu

    (College of Animal Science, Guizhou University, Guiyang 550025, China
    State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)

  • Baocheng Jin

    (College of Animal Science, Guizhou University, Guiyang 550025, China)

  • Xuechun Zhao

    (College of Animal Science, Guizhou University, Guiyang 550025, China)

Abstract

This study explored the relationship between soil organic carbon (SOC) and root distribution, with the aim of evaluating the carbon stocks and sequestration potential under five plant communities ( Alhagi sparsifolia , Tamarix ramosissima , Reaumuria soongorica , Haloxylon ammodendron , and Phragmites communis ) in an arid region, the Sangong River watershed desert ecosystem. Root biomass, ecological factors, and SOC in different layers of a 0–100 cm soil profile were investigated. The results demonstrated that almost all living fine root biomass (11.78–34.41 g/m 2 ) and dead fine root biomass (5.64–15.45 g/m 2 ) levels were highest in the 10–20 cm layer, except for the P. communis community, which showed the highest living and dead fine root biomass at a depth of 60–70 cm. Fine root biomass showed strong seasonal dynamics in the five communities from June to October. The biomass levels of the A. sparsifolia (138.31 g/m 2 ) and H. ammodendron (229.73 g/m 2 ) communities were highest in August, whereas those of the T. ramosissima (87.76 g/m 2 ), R. soongorica (66.29 g/m 2 ), and P. communis (148.31 g/m 2 ) communities were highest in September. The SOC of the five communities displayed strong changes with increasing soil depth. The mean SOC value across all five communities was 77.36% at 0–30 cm. The highest SOC values of the A. sparsifolia (3.08 g/kg), T. ramosissima (2.35 g/kg), and R. soongorica (2.34 g/kg) communities were found in June, and the highest value of the H. ammodendron (2.25 and 2.31 g/kg, p > 0.05) community was found in June and September. The highest SOC values of the P. communis (1.88 g/kg) community were found in July. Fine root production and turnover rate were 50.67–486.92 g/m 2 /year and 1.25–1.98 times per year. The relationships among SOC, fine root biomass, and ecological factors (soil water content and soil bulk density) were significant for all five communities. Based on the results, higher soil water content and soil conductivity favored the decomposition of root litter and increased fine root turnover, thereby facilitating SOC formation. Higher pH and bulk density levels are not conducive to soil biological activity and SOC mineralization, leading to increased SOC levels in desert regions.

Suggested Citation

  • Sihui Tian & Xin Liu & Baocheng Jin & Xuechun Zhao, 2022. "Contribution of Fine Roots to Soil Organic Carbon Accumulation in Different Desert Communities in the Sangong River Basin," IJERPH, MDPI, vol. 19(17), pages 1-16, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:17:p:10936-:d:904356
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