Abiotic and biotic drivers of tree trait effects on soil microbial biomass and soil carbon concentration,Ecological Monographs

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Abiotic and biotic drivers of tree trait effects on soil microbial biomass and soil carbon concentration
Ecological Monographs ( IF 6.1 ) Pub Date : 2022-12-29 , DOI: 10.1002/ecm.1563
Rémy Beugnon _{1,

2,

3} , Wensheng Bu ₄ , Helge Bruelheide _{1,

5} , Andréa Davrinche _{1,

5} , Jianqing Du _{6,

7} , Sylvia Haider _{1,

5} , Matthias Kunz ₈ , Goddert von Oheimb ₈ , Maria D. Perles‐Garcia _{1,

5} , Mariem Saadani _{1,

5} , Thomas Scholten ₉ , Steffen Seitz ₉ , Bala Singavarapu _{1,

5,

10} , Stefan Trogisch _{1,

5} , Yanfen Wang _{6,

7,

11} , Tesfaye Wubet _{1,

10} , Kai Xue _{6,

7,

11} , Bo Yang ₁₂ , Simone Cesarz _{1,

13} , Nico Eisenhauer _{1,

13}

Affiliation

German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐Leipzig, Puschstrasse 4 Leipzig Germany
Leipzig Institute for Meteorology, Universität Leipzig, Stephanstraße 3 Leipzig Germany
CEFE, Univ Montpellier, CNRS, EPHE, IRD, 1919, route de Mende Montpellier Cedex 5 France
College of Forestry Jiangxi Agricultural University Nanchang China
Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle‐Wittenberg, Am Kirchtor 1 Halle Germany
College of Resources and Environment, University of Chinese Academy of Sciences Beijing China
Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of Sciences Beijing China
Institute of General Ecology and Environmental Protection, Technische Universität Dresden, Pienner Strasse 7 Tharandt Germany
Institute of Geography, University of Tübingen, Rümelinstrasse 19‐23 Tübingen Germany
UFZ‐Helmholtz Centre for Environmental Research, Department of Community Ecology, Theodor‐Lieser‐Strasse 4 Halle (Saale) Germany
State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Chinese Academy of Sciences Beijing China
Jiangxi Key Laboratory of Plant Resources and Biodiversity Jingdezhen University Jingdezhen China
Institute of Biology, Leipzig University, Puschstrasse 4 Leipzig Germany

Forests are ecosystems critical to understanding the global carbon budget, due to their carbon sequestration potential in both aboveground and belowground compartments, especially in species-rich forests. Soil carbon sequestration is strongly linked to soil microbial communities, and this link is mediated by the tree community, likely due to modifications of microenvironmental conditions (i.e., biotic conditions, soil properties, and microclimate). We studied soil carbon concentration and the soil microbial biomass of 180 local neighborhoods along a gradient of tree species richness ranging from 1 to 16 tree species per plot in a Chinese subtropical forest experiment (BEF-China). Tree productivity and different tree functional traits were measured at the neighborhood level. We tested the effects of tree productivity, functional trait identity, and dissimilarity on soil carbon concentrations, and their mediation by the soil microbial biomass and microenvironmental conditions. Our analyses showed a strong positive correlation between soil microbial biomass and soil carbon concentrations. In addition, soil carbon concentration increased with tree productivity and tree root diameter, while it decreased with litterfall C:N content. Moreover, tree productivity and tree functional traits (e.g., fungal root association and litterfall C:N ratio) modulated microenvironmental conditions with substantial consequences for soil microbial biomass. We also showed that soil history and topography should be considered in future experiments and tree plantations, as soil carbon concentrations were higher at sites where historical (i.e., at the beginning of the experiment) carbon concentrations were high, themselves being strongly affected by the topography. Altogether, these results implied that the quantification of the different soil carbon pools is critical for understanding microbial community–soil carbon stock relationships and their dependence on tree diversity and microenvironmental conditions.

更新日期：2022-12-29

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