中国生态农业学报（中英文）2025，Vol.33Issue(3)：449-461,13.DOI:10.12357/cjea.20240078
天山北坡玛纳斯河流域土壤有机碳分布特征与影响因素
Distribution characteristics and influencing factors of soil organic carbon in the Manas River Basin on the northern slope of Tianshan Mountain
摘要
Abstract
Soil carbon pools are important in terrestrial ecosystems because they regulate atmospheric CO2 concentrations and main-tain the global carbon balance.Soil organic carbon is the most important component of the soil carbon pool and an indicator of soil quality in ecosystems.This study considered the Manas River Basin on the northern slope of the Tianshan Mountains in Xinjiang as the research area to explore the spatial and vertical distribution characteristics of soil organic carbon in typical land-use types and the main influencing factors of spatial distribution.The results showed that the spatial distribution of soil organic carbon content showed a decreasing trend from south to north,manifesting as mountainous area(17.34 g·kg-1)>mountain front(11.57 g·kg-1)>plain oasis(10.22 g·kg-1)>desert(6.69 g·kg-1);the vertical distribution continued to decrease with the increase of soil depth,decreasing from 16.08 g·kg-1(0-5 cm)to 7.91 g·kg-1(40-60 cm).Pearson's correlation analysis showed that soil organic carbon was significantly pos-itively correlated(P<0.001)with elevation,total nitrogen,alkali-hydrolyzed nitrogen,available phosphorus,and available potassium and significantly negatively correlated(P<0.001)with pH and bulk density.Structural equation model path analysis showed that alti-tude,total nitrogen,alkali-hydrolyzed nitrogen,available phosphorus,available potassium,pH,bulk density,and water content dir-ectly affected soil organic carbon content.Altitude,pH indirectly affected soil organic carbon content through affecting total nitrogen and alkali-hydrolyzed nitrogen,while water content indirectly affected soil organic carbon content by affecting bulk density.The spa-tial distribution pattern of organic carbon in soil samples from the Manas River Basin was mainly influenced by environmental factors,such as temperature and precipitation.It showed the same spatial gradient changes with altitude.The fertile soil and cold and humid climate in mountainous areas are conducive to maintaining and increasing organic carbon content.Vegetation coverage in desert areas is low with insufficient litter and plant roots as sources of organic matter.However,human factors such as changes in land-use patterns,land management measures,and agricultural development in plain oasis areas have profoundly impacted the distri-bution of soil organic carbon.This study comprehensively analyzed the effects of different topographic climates,land-use types,and soil physicochemical properties on the distribution of organic carbon in the study area,providing an essential theoretical basis for eco-logical and environmental management related to carbon balance in arid and semi-arid regions.关键词
天山北坡/玛纳斯河流域/土壤有机碳/土壤理化特征/环境因素/地貌类型Key words
north slope of Tianshan Mountain/Manas River Basin/soil organic carbon/soil physico-chemical properties/environ-ment factors/geomorphic type分类
农业科技引用本文复制引用
王健祺,李发东,李俊峰,王宁,乔云峰,李兆,刘洪光,杨广,何新林..天山北坡玛纳斯河流域土壤有机碳分布特征与影响因素[J].中国生态农业学报（中英文）,2025,33(3):449-461,13.基金项目
第三次新疆综合科学考察项目(2021xjkk0804)、国家自然科学基金项目(U180320005)和新疆生产建设兵团科技计划项目(2024BA004)资助 This study was supported by the Third Xinjiang Comprehensive Scientific Expedition(2021xjkk0804),the National Natural Science Foundation of China(U180320005),and the Science and Technology Plan Project of Xinjiang Production and Construction Corps(2024BA004). （2021xjkk0804）
