Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (7): 2140-2149.DOI: 10.11733/j.issn.1007-0435.2025.07.010

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The Growth of Moss Crust enhances the influence of Soil Bacterial Network Complexity on Ecosystem Multifunctionality in Artificial Grassland

MENG Xian-chao1,2, WANG Gui-qiang1,2, LI Hong-yan3, WANG Xian-ying4, QIN Jin-ping1, WANG Qi-rui1,2, MA Zi-feng1,2, LI Yi-kang1, ZHOU Hua-kun1, SONG Ming-hua5, LIN Li6, SHI Jian-jun7   

  1. 1. Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province, Northwest Institute of Plateau Biology, CAS, Xining, Qinghai Province 810008, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Qinghai Institute of Quality and Standards, Xining, Qinghai Province 810000, China;
    4. Qinghai Service and Guarance Center of Qilian Mountain National Park, Xining, Qinghai Province 810000, China;
    5. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    6. Xining Center of Natural Resources Comprehensive Survey China Geological Survey, Xining, Qinghai Province 810008, China;
    7. College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai Province 810016, China
  • Received:2025-02-24 Revised:2025-03-24 Online:2025-07-15 Published:2025-07-18

人工草地苔藓结皮生长增强了土壤细菌网络复杂性对生态系统多功能性的影响

孟宪超1,2, 王贵强1,2, 李鸿雁3, 王贤颖4, 秦金萍1, 汪齐瑞1,2, 马子峰1,2, 李以康1, 周华坤1, 宋明华5, 林丽6, 施建军7   

  1. 1. 中国科学院西北高原生物研究所/青海省寒区恢复生态学重点实验室, 青海 西宁 810008;
    2. 中国科学院大学, 北京 100049;
    3. 青海省质量和标准研究院, 青海 西宁 810001;
    4. 祁连山国家公园青海服务保障中心, 青海 西宁 810001;
    5. 中国科学院地理科学与资源研究所, 北京 100101;
    6. 中国地质调查局西宁自然资源综合调查中心, 青海 西宁 810008;
    7. 青海大学农牧学院, 青海 西宁 810016
  • 通讯作者: 李以康,E-mail:ykli@nwipb.cas.cn
  • 作者简介:孟宪超（1997-），女，满族，河北承德人，硕士研究生，主要从事退化草地恢复研究，E-mail：mengxianchao@nwipb.cas.cn
  • 基金资助:
    青海省自然科学基金（2025-ZJ-941M）；中国科学院战略性先导科技专项（A类）资助（XDA26020201）

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Abstract: The effects of moss crust on soil microbes and ecosystem functions in the surface layer of artificial grasslands with different planting ages on the Qinghai-Xizang Plateau remains unclear. The role of moss crust succession in shaping topsoil microbial communities and ecosystem multifunctionality （EMF） in these grasslands remained poorly understood. This study examined the changes of physicochemical properties， bacterial diversity， co-occurrence network complexity， and EMF across moss crust development stages in the topsoil （0-1 cm） during grassland restoration. A structural equation model （SEM） was employed to disentangle the interactions among these variables and quantify the influence of moss crust formation on bacterial communities and EMF. Results indicated that 18-year grasslands achieved 61.1% moss crust coverage， significantly exceeding values in 12-year （P<0.05）， 3-year grasslands， and non-restored controls （P<0.01）. Total and available nutrient concentrations in 12- and 18-year grasslands surpassed those in degraded sites. Bacterial diversity and EMF increased significantly （P<0.05）， with bacterial community composition transitioning over restoration time. Partial least squares path modeling （PLS-PM） demonstrated that bacterial diversity （P<0.05） and co-occurrence network complexity （P<0.01） exerted significant and highly significant positive effects on EMF， respectively. Moss crust primarily enhanced EMF by reinforcing bacterial network interactions. This study highlights the critical role of moss crust in restoring ecosystem functions in artificial grasslands on the Qinghai-Xizang Plateau， offering insights for sustainable rehabilitation strategies by leveraging moss crust facilitation.

Key words: Moss crust, Multifunctionality, Network complexity, Bacterial diversity

摘要： 苔藓结皮对青藏高原不同建植年限人工草地表层土壤微生物及生态系统功能的影响尚不清楚。为此本研究选取不同建植年限人工草地，探究恢复过程中苔藓结皮下的表层土壤理化性质、土壤细菌多样性、共线网络和生态系统多功能性（Ecosystem multifunctionality，EMF）的变化，通过构建结构方程模型分析了苔藓结皮对细菌和EMF的影响。结果表明，建植18年的人工草地苔藓结皮盖度为61.1%，显著高于建植12年、建植3年的人工草地和对照样地（P<0.01）；建植12年和18年人工草地的土壤全碳、全氮、铵态氮和硝态氮含量显著高于未恢复草地（P<0.05）；表层土壤（0~1 cm）EMF显著提高（P<0.05），不同恢复年限影响了土壤细菌群落结构。PLS-PM偏最小二乘通径模型分析进一步表明，细菌多样性和共线网络复杂性对EMF有显著（P<0.05）和极显著影响（P<0.01），而苔藓结皮通过显著增强细菌共线网络复杂性提高EMF。本研究揭示了苔藓结皮对青藏高原人工草地生态系统功能恢复的影响方式。

关键词: 苔藓结皮, 生态系统多功能性, 网络复杂性, 细菌多样性

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