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Nitrogen cycling-related functional genes exhibit higher sensibility in soil than leaf phyllosphere of different tree species in the subtropical forests
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Nitrogen cycling-related functional genes exhibit higher sensibility in soil than leaf phyllosphere of different tree species in the subtropical forests
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Nitrogen cycling-related functional genes exhibit higher sensibility in soil than leaf phyllosphere of different tree species in the subtropical forests
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Journal Article
Nitrogen cycling-related functional genes exhibit higher sensibility in soil than leaf phyllosphere of different tree species in the subtropical forests
2023
Overview
AimsForest ecosystems provide a large area inhabited by functional microbial communities and thus have an important influence on nitrogen (N) cycling in terrestrial ecosystems. However, little is known about how tree species alter the functional microorganisms involved in the leaf phyllosphere and soil N cycling.MethodsThe impacts of seven common subtropical tree species across different mycorrhizal types and leaf phenology on the abundance of N cycling-related functional genes were evaluated in phyllosphere and soil.ResultsWe found that deciduous trees harbored significantly higher functional gene abundance of nifH, narK, and nrfA by 26.2–46.4% compared to evergreen trees in soils. Ectomycorrhizal trees harbored significantly higher gene abundance of nifH, AOA amoA, AOB amoA, nxrA, nxrB, comammox amoA, narG, narK, nirS, and nrfA by 22.1–131% in comparison to arbuscular mycorrhizal trees in soils. Leaf dry matter content, leaf C and N contents, and litter C and N contents were important drivers of soil N cycling-related functional genes. Nonetheless, there was no significant association between the N cycling-related functional genes in the phyllosphere and soil. Leaf phenology and mycorrhizal type had little effect on N cycling-related functional genes in the phyllosphere. Root density was the best predictor for leaf phyllosphere N cycling-related functional genes.ConclusionsOur results demonstrated that tree functional traits have a crucial role in driving leaf phyllosphere and soil functional microorganisms, and emphasized the potential of manipulating tree mycorrhizal type and taxonomic identity to increase ecosystem N retention in subtropical forests.
