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Mycorrhizae enhance reactive minerals but reduce mineral-associated carbon

文献类型： 外文期刊

作者： Li, Huan 1 ; Yu, Guang-Hui 1 ; Hao, Liping 4 ; Qiu, Yunpeng 1 ; Hu, Shuijin 1 ;

作者机构： 1.North Carolina State Univ, Dept Entomol & Plant Pathol, Raleigh, NC USA

2.Nanjing Agr Univ, Coll Resource & Environm Sci, Nanjing, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Leisure Agr, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing, Peoples R China

4.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin, Peoples R China

5.North Carolina State Univ, Dept Entomol & Plant Pathol, Raleigh, NC 27695 USA

6.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin 300072, Peoples R China

关键词： arbuscular mycorrhizal fungi; Glomus; litter decomposition; microbial community; mineral-associated organic carbon; soil carbon persistence

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：11.6； 五年影响因子：12.3 ）

ISSN： 1354-1013

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Soil organic carbon (C) is the largest active C pool of Earth's surface and is thus vital in sustaining terrestrial productivity and climate stability. Arbuscular mycorrhizal fungi (AMF) form symbioses with most terrestrial plants and critically modulate soil C dynamics. Yet, it remains unclear whether and how AMF-root associations (i.e., mycorrhizae) interact with soil minerals to affect soil C cycling. Here we showed that the presence of both roots and AMF increased soil dissolved organic C and reactive Fe minerals, as well as litter decomposition and soil CO2 emissions. However, it reduced mineral-associated C. Also, high-resolution nanoscale secondary ion mass spectrometry images showed the existence of a thin coating (0.5-1.0 mu m thick) of (FeO-)-Fe-56-O-16 (Fe minerals) on the surface of (CN-)-C-12-N-14 (fungal biomass), illustrating the close physical association between fungal hyphae and soil Fe minerals. In addition, AMF genera were divergently related to reactive Fe minerals, with Glomus being positively but Paraglomus and Acaulospora negatively correlated with reactive Fe minerals. Moreover, the presence of roots and AMF, particularly when combined with litter addition, enhanced the abundances of several critical soil bacterial genera that are associated with the formation of reactive minerals in soils. A conceptual framework was further proposed to illustrate how AMF-root associations impact soil C cycling in the rhizosphere. Briefly, root exudates and the inoculated AMF not only stimulated the decomposition of litter and SOC and promoted the production of CO2 emission, but also drove soil C persistence by unlocking mineral elements and promoting the formation of reactive minerals. Together, these findings provide new insights into the mechanisms that underlie the formation of reactive minerals and have significant implications for understanding and managing soil C persistence.

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