Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (6): 1832-1842.DOI: 10.11733/j.issn.1007-0435.2024.06.019

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Effects of Grazing Intensity on Soil Aggregate Stability and Its Associated Organic Carbon Content in Alpine Grassland

GAN An-qi1, JIANG Jia-chang2, LI Xia2, WANG Yi-ting1, XU Tian-yu1, NIU De-cao1, YANG Xiao-xia3, DONG Quan-min3, GUO Ding1   

  1. 1. State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems;Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs;Engineering Research Center of Grassland Industry, Ministry of Education;College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730020, China;
    2. Gansu Grassland Technical Extension Station, Lanzhou, Gansu Province 730000, China;
    3. Qinghai Provincial Key Laboratory of Adaptive Management on Alpine Grassland, Qinghai Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, Qinghai Province 810016, China
  • Received:2023-12-04 Revised:2024-02-26 Published:2024-06-29

放牧强度对高寒草地土壤团聚体稳定性及有机碳含量影响

甘安琪1, 姜佳昌2, 李霞2, 王依婷1, 徐天宇1, 牛得草1, 杨晓霞3, 董全民3, 郭丁1   

  1. 1. 兰州大学草种创新与草地生态系统全国重点实验室, 兰州大学农业农村部草牧业创新重点实验室, 兰州大学草地农业教育部工程研究中心, 兰州大学草地农业科技学院, 甘肃 兰州 730020;
    2. 甘肃省草原技术推广总站, 甘肃 兰州 730000;
    3. 青海大学畜牧兽医科学院/青海省畜牧兽医学院, 青海省高寒草地适应性管理重点实验室, 青海 西宁 810016
  • 通讯作者: 郭丁,E-mail:guod@lzu.edu.cn
  • 作者简介:甘安琪(2000-)，女，汉族，甘肃武威人，硕士研究生，主要从事农艺与种业研究，E-mail：18810120832@163.com
  • 基金资助:
    青海省自然基金创新团队项目(2021-ZJ-901)；国家自然科学基金项目(31502010，41671106，32171867)；林草科技创新与国家合作项目(lckjcx202303)；高等学校学科创新引智计划(B12002)资助

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Abstract: Soil aggregates are closely related to soil organic carbon sequestration. Our study relied on the adaptive management technology platform of the alpine grassland-livestock system in the Qinghai-Tibet Plateau,and systematically examined soil aggregate stability and its associated organic carbon content in 0~30 cm soil layer under different grazing intensity treatments. The results showed that compared to the ungrazed treatment (CK),moderate grazing resulted in a 13.43% and 12.50% increase in the macroaggregate content and mean weight diameter (MWD) in the 0~10 cm soil layer (surface layer),respectively. But all grazing treatments decreased the macroaggregate content and MWD in 10~30 cm soil layer (subsurface layer). Compared with the CK,the macroaggregate organic carbon content under moderate grazing decreased by 8.02% in the surface layer,while moderate and heavy grazing significantly decreased the macroaggregate contributing rates for soil organic carbon in the subsurface layer by 29.85% and 32.75%,respectively. The MWD and geometric mean diameter of soil aggregates significantly positively correlated with macroaggregate content and macroaggregate contributing rates for soil organic carbon,while significantly negatively correlated with microaggregate,silt and clay aggregate content and contributing rates for organic carbon. The results showed that the effects of grazing intensity on aggregate characteristics of the subsurface layer were more significant than that of the surface layer,which could provide a theoretical basis for exploring the effects of grazing management on soil quality and structure of alpine grassland.

Key words: Alpine grassland, Grazing intensity, Soil aggregate organic carbon, Soil aggregate stability

摘要： 土壤团聚体与土壤有机碳固存密切相关。本研究依托青藏高原高寒草地家畜系统适应性管理技术平台，系统研究了0~30 cm土层不同放牧强度对土壤团聚体稳定性和有机碳含量影响。结果表明，与禁牧对照相比，中度放牧处理下0~10 cm土层(表层)土壤大团聚体质量分数和平均重量直径(Mean weight diameter，MWD)分别提高了13.43%和12.50%。所有放牧处理均降低了10~30 cm土层(亚表层)土壤大团聚体质量分数和MWD。与对照相比，中度放牧下表层土壤大团聚体有机碳含量显著降低了8.02%；中度和重度放牧处理下，亚表层土壤大团聚体有机碳贡献率分别降低了29.85%和32.75%。MWD与大团聚体质量分数和有机碳贡献率呈显著正相关，与微团聚体和粉粘粒团聚体质量分数及有机碳贡献率呈显著负相关。该研究表明放牧强度对亚表层土壤团聚体特征的影响高于表层土壤，这为探究放牧管理对高寒草地土壤质量和结构影响提供理论基础。

关键词: 高寒草地, 放牧强度, 团聚体有机碳, 团聚体稳定性

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