水土保持研究2025，Vol.32Issue(6)：29-37,9.DOI:10.13869/j.cnki.rswc.2025.06.001
祁连山南坡典型流域坡面尺度土壤有机碳变化特征及影响因素研究
Study on variation characteristics and influencing factors of soil organic carbon at slope scale in typical watersheds on southern slope of Qilian Mountains
摘要
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 semi-sunny 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.关键词
祁连山南坡/土壤有机碳/坡向/坡位Key words
southern slope of Qilian Mountains/soil organic carbon/slope aspect/slope position分类
农业科技引用本文复制引用
咸庆玲,曹广超,袁杰,赵美亮,邱巡巡,赵隆莲..祁连山南坡典型流域坡面尺度土壤有机碳变化特征及影响因素研究[J].水土保持研究,2025,32(6):29-37,9.基金项目
青海省科技厅应用基础研究项目,祁连山区南麓典型生态系统土壤界面扰动层界定及可持续固碳价值多尺度识别研究(2025-ZJ-708) （2025-ZJ-708）
