Plant functional diversity and soil properties control elevational diversity gradients of soil bacteria

FEMS Microbiology Ecology
Nobuhiko ShigyoToshihide Hirao

Abstract

Elevational gradients represent model systems for understanding the relationships between soil microbial communities and environmental factors, but the multiple influences of plant-soil linkages and climate conditions on elevational diversity gradients (EDGs) of soil microbes have never been explored. Here, we examined how climate conditions, plant diversity and soil properties affect EDGs of soil bacteria at different soil depths. Bacterial communities were investigated at four soil depths in 60 vegetation survey plots along elevational gradients in central Japan. In this study, elevational gradients reflected climate conditions, including mean annual temperature and seasonality of temperature and precipitation. Bacterial diversity decreased with elevation in the surface soil, but showed no relationship with elevation in deep soils. The structural equation modeling showed that soil bacterial diversity was directly affected by plant functional diversity, where leaf C:N ratio diversity had stronger effects than soil properties. We found that EDGs of soil bacteria were determined by the degree of indirect effects of climate conditions, via plant functional diversity and soil properties, against the direct effect of climate condit...Continue Reading

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