• ISSN 1008-505X
  • CN 11-3996/S
秦泽峰, 谢沐希, 张运龙, 李侠, 李海港, 张俊伶. 丛枝菌根真菌介导的土壤有机碳稳定机制研究进展[J]. 植物营养与肥料学报, 2023, 29(4): 756-766. DOI: 10.11674/zwyf.2022529
引用本文: 秦泽峰, 谢沐希, 张运龙, 李侠, 李海港, 张俊伶. 丛枝菌根真菌介导的土壤有机碳稳定机制研究进展[J]. 植物营养与肥料学报, 2023, 29(4): 756-766. DOI: 10.11674/zwyf.2022529
QIN Ze-feng, XIE Mu-xi, ZHANG Yun-long, Li Xia, LI Hai-gang, ZHANG Jun-ling. Research progress in soil organic carbon stabilization mediated by arbuscular mycorrhizal fungi[J]. Journal of Plant Nutrition and Fertilizers, 2023, 29(4): 756-766. DOI: 10.11674/zwyf.2022529
Citation: QIN Ze-feng, XIE Mu-xi, ZHANG Yun-long, Li Xia, LI Hai-gang, ZHANG Jun-ling. Research progress in soil organic carbon stabilization mediated by arbuscular mycorrhizal fungi[J]. Journal of Plant Nutrition and Fertilizers, 2023, 29(4): 756-766. DOI: 10.11674/zwyf.2022529

丛枝菌根真菌介导的土壤有机碳稳定机制研究进展

Research progress in soil organic carbon stabilization mediated by arbuscular mycorrhizal fungi

  • 摘要: 土壤有机碳(SOC)的稳定是陆地生态系统碳循环的关键过程之一,对维持土壤肥力和减少温室气体排放具有重要意义。以往认为植物残体中难降解性物质的物理保护和腐殖质影响土壤中有机碳库的稳定性。最近的研究结果表明,微生物介导的碳循环过程在土壤有机碳稳定中发挥着重要作用。丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)作为土壤中一类重要的共生微生物,参与植物光合碳向土壤的转运和分配,是陆地生态系统碳循环的重要一环,但其在土壤有机碳稳定中的作用潜力还未得到充分挖掘。基于此,本文估算了植物光合碳在AMF根外菌丝的分配量;总结了AMF介导的土壤有机碳稳定机制,主要包括AMF活体菌丝对碳的截留,分泌物及残体的分子结构抗性和土壤矿物吸附,提高植物源碳的质量和数量,菌丝分泌物及残体的激发效应和稳定土壤团聚体;探讨了影响AMF介导的稳定性有机碳形成的非生物(气候因子、土壤养分和土壤矿物)和生物因子(植物和AMF种类);提出了AMF与土壤有机碳周转互作机理进一步的研究方向,包括探究菌根植物光合碳转化为稳定性SOC的机制,解析不同生态系统中AMF对稳定性SOC的贡献及影响因素,并厘清不同管理措施下AMF生物量、多样性与稳定性SOC的关系。以期为更好地利用AMF提升陆地生态系统碳汇和缓解全球气候变化提供理论依据。

     

    Abstract: Soil organic carbon (SOC) stabilization is a critical process in terrestrial organic carbon dynamics and is important in maintaining soil fertility and reducing greenhouse gas emissions. Traditionally, the stable carbon pool was thought to be dominated by the physico-chemical protection of certain recalcitrant organic compounds and the formation of recalcitrant humic substances. However, recent studies have suggested that microbe-mediated carbon cycling plays an important role in soil organic carbon stabilization. Arbuscular mycorrhizal fungi (AMF), as one of the most important symbiotic fungi in soil, contribute predominantly to transportation and distribution of plant photosynthetic carbon into the soil, which influence the terrestrial carbon cycling. However, the potential of AMF in SOC stabilization has not been fully explored. Thus, on the basis of estimating the allocation of plant photosynthetic carbon to extraradical hyphae, we reviewed the possible mechanism of AMF promoting the formation of soil stable organic carbon, mainly including the carbon retention in living hyphae, resistance and soil mineral adsorption of exudates and necromass, improvement of the quality and quantity of plant-derived carbon, priming effect of secretions and necromass and stabilization of soil aggregate. Then we reviewed the abiotic (climate, soil nutrition and minerals) and biotic (plant and AMF species) factors influencing the carbon stabilization. Finally, the future research directions of the interaction mechanism between AMF and SOC turnover were proposed, including exploring the mechanism of transformation of photosynthetic carbon into stable SOC in mycorrhizal plants, analyzing the contribution of AMF to stable SOC in different ecosystems and the influencing factors, and clarifying the relationships among AMF biomass, diversity and stable SOC under different management practices. These discussions provide a theoretical basis for fully utilizing AMF to enhance the carbon sink in terrestrial ecosystems and mitigating climate change.

     

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