数字农科院2.0

Soil microbiome mediates plant community productivity in grass-legume mixtures

文献类型： 外文期刊

作者： Li, Jing;Xu, Zhuwen;Zhang, Wenbo;Yang, Xiaojiang;Struik, Paul C.;Jiang, Shenyi;Wang, Zhen;Jin, Ke

作者机构：

关键词： Grass-legume ratios;Symbiosis;Mycorrhizal fungi;Nitrogen-fixing bacteria;Plant productivity

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： Background and aimsArbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (NFB) can form symbiotic relationships with host plants, and this enhances nutrient uptake and plant performance of host plants. However, how AMF and NFB influence the complementarity and facilitation dynamics between grasses and legumes in grasslands is still not well understood.MethodsWe conducted a greenhouse experiment to assess effects of different grass: legume ratios (GLRs) and microbial symbionts on plant production comprising two native C3 species from a semiarid steppe in northern China (grass (G): Leymus chinensis; legume (L): Medicago ruthenica). Different GLRs (G4L0: 4:0, G3L1: 3:1, G2L2: 2:2, G1L3: 1:3, G0L4: 0:4) were compared with or without AMF or NFB inoculation.ResultsGrass-legume mixtures, especially G1L3, produced significantly higher biomass than monocultures via altering the community structure of soil microorganisms. AMF inoculation increased the availability of nutrients (mainly soil available P (SAP) and/or NO3--N), which increased plant community productivity due to increased biomass in both grass and legume. Co-occurrence networks revealed that keystone genera (e.g., Arenimonas, Dominikia, Claroideoglomus and Scutellospora) were the primary factors influencing plant community productivity among grass-legume mixtures. Structural equation model showed that GLRs and inoculation types consistently produced overyielding directly and indirectly via affecting SAP and NO3--N concentrations.ConclusionOur findings highlight that suitable grass: legume mixture ratios (e.g., 1:3) positively affect productivity, and soil microorganisms that improve soil resource acquisition (SAP and NO3--N), especially AMF, play an important role in grass: legume mixtures in this process.

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