Effects of Different Grazing Intensities on Soil Organic Carbon in Typical Grasslands
HE Xiao-han1, TANG Yue1, LIU Xin-rui1, WANG Zhong-wu1, HE Li-ming1, YAN Jia1, WANG Jing1, QU Zhi-qiang1, LI Zhi-guo1, HAN Guo-dong1
Affiliations
1 College of grassland science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010010, China
doi: 10.11733/j.issn.1007-0435.2026.02.024
文章导航
摘要
收起
为明晰不同放牧强度下内蒙古典型草原土壤有机碳（Soil organic carbon，SOC）的分布特征及其影响因素，本试验以内蒙古锡林郭勒正镶白旗典型草原为研究对象，针对不同放牧强度下的0~50 cm土层的SOC、全碳（Soil total carbon，STC）、全氮（Soil total nitrogen，STN）、全磷（Soil total phosphorus，STP）、土壤含水量（Soil water content，SWC）、土壤pH值（pH）、土壤容重（Soil bulk density，SBD）以及植物地上生物量（Aboveground biomass，AGB）等指标进行了测定和分析。结果表明：SOC含量在不同放牧强度下均随土层深度的增加而逐渐降低，0~10 cm的SOC含量均最高。在无牧、中度放牧和重度放牧条件下，自0~50 cm土层，SOC含量分别下降了7%，17%和8%；中度放牧显著提高了0~30 cm的SOC含量，且0~10 cm的SOC含量提升最多，增幅为11%；放牧对SOC含量的影响随土层深度的增加而降低，土层越深放牧的影响越弱；不同放牧强度改变了SOC与环境因子的关系，随着放牧强度的增加，SOC的影响因素从AGB和SWC逐步转向土壤养分和土壤物理性质。研究表明：在放牧持续时间较短时，中度放牧更有利于典型草原SOC的积累和转化。重度放牧虽未显著降低SOC含量，但已呈现碳流失风险，需通过控制放牧强度优先保护表层碳库。
关键词
典型草原
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放牧
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有机碳
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土壤理化性质
Abstract
收起
To clarify the distribution characteristics of soil organic carbon （SOC） and its influencing factors under different grazing intensities in a typical Inner Mongolian grassland， 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 0-50 cm 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 all grazing intensities， with the highest SOC content observed in the 0-10 cm layer. From 0 to 50 cm deep layers， SOC declined by 7% （CK）， 17% （MG）， and 8% （HG）. Moderate grazing significantly increased SOC content in the 0-30 cm layer， with the greatest increase （11%） in the 0-10 cm layer （from 35.33 to 39.45 g·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 transformation 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
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Grazing Capacity
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Organic Carbon
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Soil Physical and Chemical Properties
HE Xiao-han, TANG Yue, LIU Xin-rui, WANG Zhong-wu, HE Li-ming, YAN Jia, WANG Jing, QU Zhi-qiang, LI Zhi-guo, HAN Guo-dong.
Effects of Different Grazing Intensities on Soil Organic Carbon in Typical Grasslands[J].
Acta Agrestia Sinica,
2026
, 34
(2)
: 624
-631
.
DOI: 10.11733/j.issn.1007-0435.2026.02.024
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