菌根对土壤呼吸影响的研究进展
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郑翔(1992-),男,副教授,硕士生导师,主要从事全球变化与土壤碳氮循环研究。E-mail:xiangzheng@nxu.edu.cn

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S154.36

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国家自然科学基金项目(42407340);宁夏重点研发项目引才专项(2024BEH04098)


Progress in the Study of the Effects of Mycorrhiza on Soil Respiration
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    摘要:

    [目的] 菌根作为连接植物与土壤的桥梁,在土壤碳(C)库收支平衡中扮演着关键角色。菌根通过吸收土壤中的矿物营养物质以交换植物光合作用固定的C,同时也通过呼吸作用造成土壤C损失。尽管人们对菌根在土壤碳输入、分解和固持方面的作用已有较深入了解,但关于菌根对土壤呼吸的影响仍相对有限。[方法] 采用网络排除法和比较法综述菌根对土壤呼吸的影响及其调控因子。[结果] 通过网格排除法,有学者成功分离并量化菌根呼吸,发现其平均占土壤呼吸的16.8%。具体而言,丛枝菌根呼吸和外生菌根呼吸对土壤呼吸的贡献分别为18.4%(2.5%~32.0%)和15.1%(3.0%~62.1%)。与无菌根植物相比,接种菌根的植物平均增加26.0%土壤呼吸。菌根呼吸对土壤温度和土壤湿度的响应在不同生态系统中存在差异,菌根呼吸对土壤湿度的变化更加敏感。土壤养分有效性通过影响植物的养分获取策略,从而调控菌根与植物的共生关系,进而调控菌根的呼吸。植物细根生物量、根外菌丝长度密度及植物供应的底物等生物因子也对菌根呼吸有显著影响。[结论] 菌根呼吸是土壤呼吸和自养呼吸的重要组成部分,引起的土壤C损失不容忽视,需要更先进的方法分离和量化菌根呼吸,并将菌根呼吸纳入全球碳模型,以便更准确地评估土壤碳循环动态,为全球碳管理和缓解全球气候变化提供科学依据。

    Abstract:

    [Objective] Mycorrhiza,as a bridge connecting plants and soil,play a crucial role in soil carbon(C) budget. They absorb mineral nutrients from the soil in exchange for C fixed by plant photosynthesis,while simultaneously contributing to soil C loss through respiration. Although the roles of mycorrhiza in soil C input,C stability,and C sequestration are relatively well understood,knowledge of the effects of mycorrhiza on soil respiration remains less explored. [Methods] Using network exclusion and comparison methods,this review synthesizes current knowledge on the influence of mycorrhiza on soil respiration and its regulatory factors. [Results] Using the mesh exclusion method,researchers have successfully isolated and quantified mycorrhizal respiration,and found that it accounted for an average of 16.8% of soil respiration. Specifically,the contributions of arbuscular mycorrhizal respiration and ectomycorrhizal respiration to soil respiration are 18.4%(2.5%-32.0%) and 15.1%(3.0%-62.1%),respectively. Compared to mycorrhizal-free plants,mycorrhizal-inoculated plants increased soil respiration by an average of 26.0%. Mycorrhizal respiration responds differently to soil temperature and soil moisture across various ecosystems,with mycorrhizal respiration appearing to be more sensitive to changes in soil moisture. Soil nutrient availability regulates the symbiotic relationship between mycorrhizal fungi and plants by affecting the nutrient acquisition strategies of plants,thereby regulating mycorrhizal respiration. Additionally,biological factors such as fine root biomass,extraradical hyphal length density,and the substrates supplied by plants also have significant effects on mycorrhizal respiration. [Conclusion] As an important component of both soil respiration and autotrophic respiration,mycorrhizal respiration contributes substantially to soil C loss,which cannot be overlooked. More advanced methods are needed to isolate and quantify mycorrhizal respiration,and incorporate it into global C models to more accurately assess soil C cycling dynamics,thus providing a scientific basis for global C management and mitigating climate change.

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郑翔, 柳思博, 何莹莹, 姜姜, 蔡延江, 张萍, 田佳, 邱开阳.菌根对土壤呼吸影响的研究进展[J].水土保持学报,2025,39(5):13~23,32

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  • 收稿日期:2025-02-11
  • 最后修改日期:2025-03-14
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  • 在线发布日期: 2025-10-20
  • 出版日期: 2025-10-28
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