放牧对中国北部草地土壤真菌群落组成和功能的影响:Meta分析
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作者单位:

1.兰州大学草种创新与草地农业生态系统全国重点实验室/草地农业科技学院;2.南京农业大学资源与环境科学学院/江苏省固体有机废弃物资源化研究重点实验室

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基金项目:

国家自然科学基金项目(42277100)资助


Meta-analysis: Effects of Grazing on Composition and Function of Soil Fungal Community in Northern Grasslands of China
Author:
Affiliation:

1.State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University;2.tate Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou;3.College of Resources and Environmental Sciences, Nanjing Agricultural University/Jiangsu Provincial Key Laboratory of Solid Organic Waste Utilization, Nanjing

Fund Project:

Supported by the National Natural Science Foundation of China (No. 42277100)

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    摘要:

    为明确放牧对中国北部草地土壤真菌群落组成和功能影响的普遍规律,并为草原生态保护提供理论依据,收集了119条放牧草地的土壤真菌原始数据,使用统一的生物信息学处理方式和Meta分析方法探究放牧草地土壤真菌α-多样性、群落组成和功能群落的变化,并使用加权混合效应模型进行环境因素分析。结果表明:放牧使土壤真菌α-多样性降低,同时显著降低了土壤中病原真菌、木腐真菌、土壤腐生真菌、内生真菌的相对丰度。土壤真菌α-多样性降低以及功能真菌相对丰度的改变依赖于不同地区环境因素的变化。在土壤有机碳含量和碳氮比较低以及年均降水量高的地区,放牧对土壤真菌α-多样性的负效应被适当缓解。初始有机碳含量和禁牧时间影响了土壤功能真菌丰度变化的趋势。长期禁牧能够恢复土壤腐生型和共生型真菌的相对丰度。随初始碳氮比的升高,放牧条件下病原真菌相对丰度的减少程度减弱,而腐生真菌相对丰度的减少程度增强。降水量越低的地区,放牧会更大程度减少腐生和共生真菌的相对丰度。总体而言,放牧对中国北部草地土壤真菌群落的α-多样性和功能产生负效应,但负效应程度和趋势依赖于当地环境状况。

    Abstract:

    【Objective】This study aimed to clarify the general rules of the impact of grazing on the composition and function of soil fungal communities in northern grasslands of China, and to provide the theoretical foundation for ecological conservation efforts in these grasslands. 【Method】This study collected 119 raw data of soil fungi from different studies in grazed grasslands, used unified bioinformatics processing methods and meta-analysis to demonstrate the changes in α-diversity, community composition and functional groups of soil fungi within grazed grasslands, and used weighted mixed-effects models for environmental factor analysis. 【Result】The results indicated that grazing reduced the soil fungal α-diversity and significantly decreased the relative abundance of pathotrophic fungi, wood saprotrophic fungi, soil saprotrophic fungi, and endophytic fungi. The change in grazing soil fungal α-diversity and functional fungal relative abundance depended on altered environmental factors in different regions. The negative effect of grazing on soil fungal α-diversity was mitigated to some extent in the regions with lower organic carbon content, lower carbon-to-nitrogen ratio, and higher annual precipitation. Initial soil organic carbon content and grazing exclusion duration influenced the variations in functional fungal abundance, with long-term grazing exclusion promoting the recovery of soil saprotrophic and symbiotrophic fungi communities. As the initial carbon-to-nitrogen ratio increased, the degree of reduction in the relative abundance of pathotrophic fungi under grazing decreased. In contrast, the degree of reduction in the relative abundance of saprotrophic fungi increased. Importantly, in regions with lower precipitation, grazing had a more significant impact on reducing the relative abundance of saprotrophic and symbiotrophic fungi. 【Conclusion】Overall, grazing negatively affected the α-diversity and functional traits of soil fungal communities in the northern grasslands of China. However, the degree and direction of this effect depended on the local environmental conditions.

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林曦照,李星陆,姜筱雨,贺鹏,王雪薇,凌宁.放牧对中国北部草地土壤真菌群落组成和功能的影响:Meta分析[J].土壤学报,DOI:10.11766/trxb202304150149,[待发表]
LIN Xizhao, LI Xinglu, JIANG Xiaoyu, HE Peng, WANG Xuewei, LING Ning. Meta-analysis: Effects of Grazing on Composition and Function of Soil Fungal Community in Northern Grasslands of China[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202304150149,[In Press]

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  • 收稿日期:2023-04-15
  • 最后修改日期:2023-10-15
  • 录用日期:2023-11-29
  • 在线发布日期: 2023-12-01
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