Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2022, Vol. 30 ›› Issue (9): 2273-2279.DOI: 10.11733/j.issn.1007-0435.2022.09.006

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Effects of Grazing on Plant Community and Soil Organic Carbon in the Typical Steppe of Inner Mongolia, China

XU Ting-ting1,2, DONG Zhi2, GUO Jian-ying3, LI Hong-li2, WANG Shu-mei2, CHEN Xin-chuang2   

  1. 1. Feicheng Administrative Examination and Approval Service Bureau, Tai'an, Shandong Province 271600, China;
    2. College of Forestry, Shandong Agricultural University, Taishan Forest Ecosystem Research Station, Tai'an, Shandong Province 271018, China;
    3. Institute of Water Resources for Pastoral Area of the Ministry of Water Resources of China, Hohhot, Inner Mongolia 010020, China
  • Received:2022-03-24 Revised:2022-04-27 Online:2022-09-15 Published:2022-09-30

放牧对内蒙古典型草原植物群落特征与土壤有机碳的影响

许婷婷1,2, 董智2, 郭建英3, 李红丽2, 王树梅2, 陈新闯2   

  1. 1. 肥城市行政审批服务局, 山东 泰安 271600;
    2. 山东农业大学林学院/泰山森林生态系统定位研究站, 山东 泰安 271018;
    3. 水利部牧区水利科学研究所, 内蒙古 呼和浩特 010020
  • 通讯作者: 陈新闯,E-mail:xinchuang_chen@sdau.edu.cn
  • 作者简介:许婷婷(1987-),女,汉族,山东泰安人,硕士,主要从事水土保持与资源评价,E-mail:yiyangcuican@126.com
  • 基金资助:
    国家自然科学基金（51879155，31870708）；内蒙古自治区科技重大专项（2019ZD003-3-1，2019ZD003-2-1）资助

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Abstract: To figure out the impact of grazing intensity on the plant community characteristics and soil organic carbon density of a typical steppe. This research was based on the Xilamuren grassland that has been long-term grazing under different grazing intensities, analyzed the vegetation community and the soil organic carbon density change of 0~20 cm, and quantitatively evaluated the driving factors of soil organic carbon density. The results showed that with the increase of grazing intensity, Among the dominant species in the plant community, the important values of Stipa krylovii and Heteropappus altaicus decreased, while the important values of Convolvulus Ammannii, Leymus chinensis, and Agropyron cristatum increased, species diversity showed an increasing trend, and the difference was significant under heavy grazing intensity, but the vegetation coverage and above-ground biomass decreased significantly;the organic carbon content in the soil layer was both at 5~10 cm was the highest, soil organic carbon density of heavy grazing was significantly higher than forbidding grazing grassland, light grazing grassland, and medium grazing grassland;Through structural equation, it was concluded that aboveground biomass has a relatively small impact on soil organic carbon density due to grazing activities for the arid and barren grassland, soil porosity directly affected soil organic carbon storage. Therefore, the study results provide practical guiding significance for reasonably enhancing the carbon sink capacity of grazing grassland.

Key words: Grazing intensity, Community characteristics, Plant diversity, Soil organic carbon, Path analysis

摘要： 为了解不同放牧强度对内蒙古放牧草原植物群落特征及土壤有机碳的影响，本研究以希拉穆仁草原为研究对象，分析不同放牧强度下植物群落特征及0~20 cm土壤有机碳含量和密度变化，定量评估放牧、植物群落特征对土壤有机碳的影响。结果表明：随着放牧强度的增强，克氏针茅（Stipa krylovii）、阿尔泰狗娃花（Heteropappus altaicus）的重要值降低，银灰旋花（Convolvulus Ammannii）、羊草（Leymus chinensis）和冰草（Agropyron cristatum）的重要值提升，物种多样性指数均呈增长趋势，且在重度放牧强度下差异显著，但覆盖度和地上生物量显著降低；土壤有机碳含量在5~10 cm土壤层最高，重度放牧草场土壤有机碳密度显著高于轻度、中度放牧草场和禁牧草场。通过结构方程得出，对于干旱贫瘠的希拉穆仁草原，放牧造成地上生物量的减少对土壤有机碳密度的影响相对较小，土壤物理性质显著影响土壤有机碳密度。本研究结果对合理增强放牧草原的碳汇能力具有实际指导意义。

关键词: 放牧强度, 群落特征, 生物多样性, 土壤有机碳, 路径分析

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