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[1]Xian Qingling,Cao Guangchao,Yuan Jie,et al.Study on variation characteristics and influencing factors of soil organic carbon at slope scale in typical watersheds on southern slope of Qilian Mountains[J].Research of Soil and Water Conservation,2025,32(06):29-37.[doi:10.13869/j.cnki.rswc.2025.06.001]

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Study on variation characteristics and influencing factors of soil organic carbon at slope scale in typical watersheds on southern slope of Qilian Mountains

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 29-37 Column: Public date: 2025-10-20

Title:: Study on variation characteristics and influencing factors of soil organic carbon at slope scale in typical watersheds on southern slope of Qilian Mountains

Author(s):: Xian Qingling^1,2,Cao Guangchao^1,2,3,Yuan Jie^1,2,3,Zhao Meiliang^1,2,Qiu Xunxun^1,2,Zhao Longlian^1,2; (1.Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation(Ministry of Education),QinghaiNormal University,Xining 810008,China;2.Qinghai Province Key Laboratory of Physical Geography and Environmental Process,College of Geographical Science,Qinghai Normal University,Xining 810008,China;3.Academy of PlateauScience and Sustainability,People's Government of Qinghai Province & Beijing Normal University,Xining 810008,China)

Keywords:: southern slope of Qilian Mountains; soil organic carbon; slope aspect; slope position

CLC:: S153.6

DOI:: 10.13869/j.cnki.rswc.2025.06.001

Abstract:: [Objective] To explore the variation characteristics and influencing factors of soil organic carbon (SOC) at the slope scale in typical watersheds on the southern slope of the Qilian Mountains, thereby providing data support for accurate estimation of soil interface carbon at the catchment scale in complex mountainous areas. [Methods] Taking the Amidongsuo watershed, a typical small watershed on the southern slope of the Qilian Mountains, as the study area, the distribution characteristics and influencing factors of SOC under different slope aspects, slope positions, and vegetation types were analyzed based on systematic field sampling. [Results](1) The average SOC content in the study area was(41.604 g/kg±19.28 g/kg), showing a relatively high overall level. Meanwhile, SOC content generally decreased with increasing soil depth. (2) Influenced by processes such as slope topography, SOC content on shady to semi-shady slopes(48.59 g/kg±19.27 g/kg) was significantly higher (p<0.05) than that on sunny to semi-sunny slopes(32.27 g/kg±15.11 g/kg). The SOC content was highest at the mid-slope on shady to semi-shady slopes(52.65 g/kg±17.66 g/kg), and at the summit on sunny to semisunny slopes(38.42 g/kg±17.03 g/kg). On shady to semi-shady slopes, SOC content was highest under mixed shrubland(53.45 g/kg±23.72 g/kg), followed by Qinghai spruce forest and alpine desert grassland. On sunny to semi-sunny slopes, the SOC content was highest in alpine desert grassland(34.31 g/kg±16.96 g/kg), followed by Qilian juniper forest.(3) One-way analysis of variance showed that soil layer was the main factor influencing SOC variation on slopes, and the interaction between slope position and vegetation type also had a significant impact on SOC content. Principal component analysis and correlation analysis revealed that the main environmental factors influencing SOC content on slopes were bulk density, silt, sand, temperature, precipitation, elevation, moisture content, and water storage. [Conclusion] The distribution of SOC in the study area is jointly influenced by soil depth, slope aspect, slope position, vegetation type, and soil properties.

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Last Update: 2025-12-10