不同放牧强度对典型草原土壤有机碳的影响

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中图分类号：S812.2 文献标识码：A 文章编号：1007-0435（2026）02-0624-08

Abstract：To clarify the distribution characteristics of soil organic carbon （SOC）and its influencing factors under diffrent grazing intensities in a typical Inner Mongolian grassand，this study measured and analyzed SOC，total carbon（STC），total nitrogen （STN），total phosphorus （STP），soil water content（SWC），soil pH ，soil bulk density（SBD），and aboveground biomass （AGB） across the 0-50cm soil layers under no grazing（CK），moderate grazing（MG），and heavy grazing（HG） in Zhengxiangbai Banner，Xilingol League， Inner Mongolia. Key results included ： SOC content decreased with soil depth under allgrazing intensities，with the highest SOC content observed in the 0-10cm layer. From O to 50cm deep layers，SOC declined by 7% （CK）， 17% （MG），and 8% （HG）. Moderate grazing significantly increased SOC content in the 0-30cm （20号 layer，with the greatest increase （ 11%） in the 0-10cm layer（from 35.33 to 39.45g⋅kg-1. .Grazing effects on SOC diminished with soil depth，showing weaker impacts on deeper layers.Grazing intensity altered SOC-environment relationships： SOC was primarily driven by AGB and SWC under CK，shifted to interactions with soil nutrients（STN）and physical properties（SBD，pH） under MG，and strongly correlated with STC，STN，

STP，and SBD under HG. The study concludes that moderate grazing enhances SOC accumulation and trans formation in the short term，while heavy grazing poses a risk of carbon loss despite no significant SOC reduction.Protecting surface carbon pools through controlled grazing intensity is critical for sustainable grassland management.

Key words： Typical Grassland;Grazing Capacity;Organic Carbon;Soil Physical and Chemical Properties

草地是地球上面积最大的陆地生态系统之一，约占全球陆地面积的 40% 。（剩余14904字）