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Meta-analysis shows positive effects of plant diversity on microbial biomass and respiration
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Meta-analysis shows positive effects of plant diversity on microbial biomass and respiration
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Meta-analysis shows positive effects of plant diversity on microbial biomass and respiration
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Journal Article
Meta-analysis shows positive effects of plant diversity on microbial biomass and respiration
2019
Overview
Soil microorganisms are key to biological diversity and many ecosystem processes in terrestrial ecosystems. Despite the current alarming loss of plant diversity, it is unclear how plant species diversity affects soil microorganisms. By conducting a global meta-analysis with paired observations of plant mixtures and monocultures from 106 studies, we show that microbial biomass, bacterial biomass, fungal biomass, fungi:bacteria ratio, and microbial respiration increase, while Gram-positive to Gram-negative bacteria ratio decrease in response to plant mixtures. The increases in microbial biomass and respiration are more pronounced in older and more diverse mixtures. The effects of plant mixtures on all microbial attributes are consistent across ecosystem types including natural forests, planted forests, planted grasslands, croplands, and planted containers. Our study underlines strong relationships between plant diversity and soil microorganisms across global terrestrial ecosystems and suggests the importance of plant diversity in maintaining belowground ecosystem functioning.
The effect of plant biodiversity on microbial function has been tested in limited studies and is likely to be context-dependent. In this meta-analysis of 106 prior studies comparing plant monocultures to mixtures, the authors find that plant diversity increases microbial biomass and respiration rates, an effect moderated by stand age.
