Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (1): 98-106.DOI: 10.11733/j.issn.1007-0435.2025.01.012

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Impacts of Different Vegetation Types on Soil Aggregate Stability in the Alpine Treeline Ecotone of Southeastern Xizang

ZHU Si-jie1,2,3, ZHANG Bo1,2,3, FU Fang-wei1,2,3, DING Hui-hui4, GUO Liang-na1,2,3, LI Jiang-rong1,2,3,5   

  1. 1. Research Institute of Tibet Plateau Ecology, Tibet Agriculture & Animal Husbandry University, Nyingchi, Xizang 860000, China;
    2. Key Laboratory of Forest Ecology in Tibet Plateau, Ministry of Education, Nyingchi, Xizang 860000, China;
    3. National Key Station of Field Scientific Observation & Experiment, Nyingchi, Xizang 860000, China;
    4. College of Resources and Environment, Anhui Agricultural University, Hefei, Anhui Province 230000, China;
    5. State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2024-07-04 Revised:2024-08-05 Published:2025-01-22

藏东南林线过渡带不同植被类型对土壤团聚体稳定性的影响

朱思洁1,2,3, 张波1,2,3, 付芳伟1,2,3, 丁慧慧4, 郭亮娜1,2,3, 李江荣1,2,3,5   

  1. 1. 西藏农牧学院高原生态研究所, 西藏 林芝 860000;
    2. 西藏高原森林生态教育部重点实验室, 西藏 林芝 860000;
    3. 西藏林芝高山森林生态系统国家野外科学观测研究站, 西藏 林芝 860000;
    4. 安徽农业大学资源与环境学院, 安徽 合肥 230000;
    5. 中国科学院青藏高原研究所青藏高原地球系统与资源环境国家重点实验室, 北京 100101
  • 通讯作者: 李江荣,E-mail：ljrong06@xza.edu.cn
  • 作者简介:朱思洁（1999-）,女,汉族,湖南常德人,硕士研究生,主要从事森林生态学方向的研究,E-mail：202200601274@stu.xza.edu.cn
  • 基金资助:
    西藏自治区科技厅项目-藏东南高山松长期生态学观测研究（科技创新基地）（XZ202301JD0001G）；国家科技部生态站项目（LZF2020-2025）；西藏高原森林生态教育部重点实验室研究生创新计划项目（XZA-JYBSYS-2023-27）资助

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Abstract: The structure of soil aggregates is crucial for maintaining the stability and functionality of soil ecosystems. To explore the specific factors influencing soil aggregate stability across vegetation types such as trees, shrubs, and meadows within an unique region of the alpine treeline ecotone, this study focused on the alpine treeline ecotone of Juniperus saltuaria forests on the sunny slope of Sygera Mountains in southeastern Xizang. Employing the dry-sieving method, we investigated the composition of soil aggregates and the influence of soil physicochemical properties on aggregate stability under four vegetation types： Abies georgei var. Smithii forests, Juniperus saltuaria forests, Rhododendron nivale shrublands and meadows. The results showed that： Under all four vegetation types, the content of soil aggregates with particle sizes >0.25 mm was significantly higher than that of aggregates <0.25 mm. Soil aggregate stability in meadows and shrublands consistently surpassed that in tree forests, with the lowest stability observed in the Juniperus saltuaria forest soil at the 0-10 cm soil layer and in the Abies georgei var. smithii forest soil at the 10-20 cm soil layer. The composition of soil aggregates was jointly influenced by multiple soil physicochemical properties, significantly impacting their stability. Specifically, lower soil pH, smaller bulk density, higher organic matter content, greater capillary water holding capacity, or higher porosity were associated with better soil aggregate stability. The results of this study provide data support for an in-depth understanding of soil quality and structure in high-altitude mountainous areas.

Key words: Vegetation type, Alpine treeline, Dry sieving method, Soil aggregate stability

摘要： 土壤团聚体结构对于维护土壤生态系统的稳定性和功能至关重要。为探究林线过渡带这一特殊区域内乔木、灌木和草甸等植被类型对土壤团聚体稳定性的影响,本研究以藏东南色季拉山阳坡的方枝柏林线过渡带为研究区,采用干筛法研究了急尖长苞冷杉林、方枝柏林、雪层杜鹃林和草甸4种植被类型下土壤团聚体的组成及土壤理化指标对团聚体稳定性的影响。结果表明：在4种不同植被类型下,粒径>0.25 mm的土壤团聚体含量显著高于<0.25 mm的团聚体含量；草甸和灌木林土壤团聚体稳定性始终高于乔木林,0~10 cm土层中方枝柏林土壤团聚体稳定性最差,10~20 cm土层中急尖长苞冷杉林土壤团聚体稳定性最差；土壤的多种理化性质共同作用于土壤团聚体的组成,进而对其稳定性产生显著影响。具体而言,土壤pH值越低、容重越小、有机质含量越高、毛管持水量越大或孔隙度越大,土壤团聚体稳定性就越好。本研究结果为深入了解高海拔山区土壤质量和结构提供了数据支撑。

关键词: 植被类型, 林线过渡带, 干筛法, 团聚体稳定性

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