Effects of Different Grazing Intensities on Soil Organic Carbon Content in Desert Steppe

doi:10.11733/j.issn.1007-0435.2025.08.014

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (8): 2541-2547.DOI: 10.11733/j.issn.1007-0435.2025.08.014

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Effects of Different Grazing Intensities on Soil Organic Carbon Content in Desert Steppe

ZHANG Lei¹, ZHANG Yu-juan², SUN Shi-xian², XU Xue-bao¹, XING Yue³, LIU Xiao-li³, GAO Cui-ping¹, WANG Cheng-jie¹

1. College of Grassland, Resources and Environment, Inner Mongolia Agricultural University/Key Laboratory of Grassland Resources, Ministry of Education, Hohhot, Inner Mongolia 010011, China;
2. Institute of Grassland Research of CAAS, Hohhot, Inner Mongolia 010010, China;
3. Agricultural and Animal Husbandry Technology Extension Center of Inner Mongolia, Hohhot, Inner Mongolia 010010, China

Received:2024-11-20 Revised:2025-02-20 Online:2025-08-15 Published:2025-08-27

不同放牧强度对荒漠草原土壤活性有机碳的影响

张磊¹, 张玉娟², 孙世贤², 徐学宝¹, 邢越³, 刘晓丽³, 高翠萍¹, 王成杰¹

1. 内蒙古农业大学草业学院/草地资源教育部重点实验室, 内蒙古呼和浩特 010011;
2. 中国农业科学院草原研究所, 内蒙古呼和浩特 010011;
3. 内蒙古农牧业技术推广中心, 内蒙古呼和浩特 010011

通讯作者: 王成杰, E-mail:nmgcjwang3@163.com
作者简介:张磊(1998-),男,汉族,内蒙古呼和浩特人,硕士研究生,主要从事草地资源生态与管理方向研究,E-mail:zl2368912726@163.com
基金资助:
内蒙古自治区科技计划项目（2021GG0393，2021CG0020）；内蒙古自治区自然科学基金项目（2021MS03073）；内蒙古自治区草地管理与利用重点实验室（2022PT0003）资助

Abstract

Abstract: The effects of different grazing intensities on soil active organic carbon in desert steppe were studied to understand the regulation mechanism of grazing on soil organic carbon， aiming to provide a theoretical basis for reasonable control of grazing intensity. In this study， desert steppe with Stipa breviflora as a dominant species in Inner Mongolia was used as the research object to determine the content of soil organic carbon and its active components， soil physical and chemical properties， aboveground and belowground biomass and litter amount. The results showed that the soil organic carbon （SOC） content in the non-grazing treatment was significantly higher than that in the grazing treatment （P<0.05）.With the increase of grazing intensity， the soil total nitrogen （TN） content decreased gradually， and the soil alkaline nitrogen （AN） in non-grazing treatment was significantly higher than that in grazing treatment （P<0.05）. The soil bulk density （BD） and pH value increased gradually， and the non-grazing treatment was significantly lower than that in grazing treatment （P<0.05）. Aboveground biomass （AGB）， belowground biomass （BGB） and litter （L） decreased with the increase of grazing intensity. The correlation analysis of SOC and its components and physical and chemical properties showed that SOC content was significantly positively correlated with soil TN， AN， aboveground biomass （AGB） and content， and SOC content was significantly negatively correlated with soil BD and pH. The results of this study showed that overgrazing significantly reduced soil organic carbon. Therefore， it is recommended to maintain grazing intensity at light grazing （1.54 sheep·hm^-2·a^-1） can effectively maintain grassland productivity and protect soil organic carbon.

Key words: Grazing intensity, Desert steppe, Soil organic carbon, Biomass

摘要： 研究不同放牧强度对荒漠草原土壤活性有机碳的影响，了解放牧对土壤有机碳的调控机制，旨在为合理控制放牧强度提供理论基础。本研究以内蒙古短花针茅（Stipa breviflora）荒漠草原为研究对象，测定土壤有机碳及其活性组分含量、土壤理化性质和地上地下生物量及枯落物量。研究结果表明，未放牧处理荒漠草原土壤有机碳（Soil organic carbon，SOC）含量显著高于放牧处理（P<0.05）；随着放牧强度的增加，土壤全氮（Total nitrogen，TN）含量逐渐降低，土壤碱解氮（Alkaline nitrogen，AN）未放牧处理均显著高于放牧处理（P<0.05），土壤容重（Bulk density，BD）、pH值逐渐升高，未放牧处理显著低于放牧处理（P<0.05），地上生物量（Aboveground biomass，AGB）、地下生物量（Belowground biomass，BGB）和枯落物（Litters，L）均随着放牧强度增加而降低。对土壤有机碳及其组分和理化性质的相关分析得出，土壤SOC含量与土壤TN，AN，AGB，L含量表现为显著正相关，土壤SOC含量与土壤BD、pH值表现为显著负相关。本研究结果表明，过度放牧会显著减少土壤有机碳。因此，建议将放牧强度维持在轻度放牧（1.54羊·hm^-2·a^-1）可以有效地维持荒漠草地生产力和保护土壤有机碳。

关键词: 放牧强度, 荒漠草原, 土壤有机碳, 生物量

CLC Number:

S812.2

ZHANG Lei, ZHANG Yu-juan, SUN Shi-xian, XU Xue-bao, XING Yue, LIU Xiao-li, GAO Cui-ping, WANG Cheng-jie. Effects of Different Grazing Intensities on Soil Organic Carbon Content in Desert Steppe[J]. Acta Agrestia Sinica, 2025, 33(8): 2541-2547.

张磊, 张玉娟, 孙世贤, 徐学宝, 邢越, 刘晓丽, 高翠萍, 王成杰. 不同放牧强度对荒漠草原土壤活性有机碳的影响[J]. 草地学报, 2025, 33(8): 2541-2547.

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Effects of Different Grazing Intensities on Soil Organic Carbon Content in Desert Steppe

不同放牧强度对荒漠草原土壤活性有机碳的影响

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