Effects of forest degradation on microbial communities and soil carbon cycling: A global meta‐analysis

Global Ecology and Biogeography - Tập 27 Số 1 - Trang 110-124 - 2018
Zhenghu Zhou1, Chuankuan Wang1, Yiqi Luo2
1Center for Ecological Research, Northeast Forestry University, Harbin, China
2Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma

Tóm tắt

AbstractAim

The aim was to explore how conversions of primary or secondary forests to plantations or agricultural systems influence soil microbial communities and soil carbon (C) cycling.

Location

Global.

Time period

1993–2017.

Major taxa studied

Soil microbes.

Methods

A meta‐analysis was conducted to examine effects of forest degradation on soil properties and microbial attributes related to microbial biomass, activity, community composition and diversity based on 408 cases from 119 studies in the world.

Results

Forest degradation decreased the ratios of K‐strategists to r‐strategists (i.e., ratios of fungi to bacteria, Acidobacteria to Proteobacteria, Actinobacteria to Bacteroidetes and Acidobacteria + Actinobacteria to Proteobacteria + Bacteroidetes). The response ratios (RRs) of the K‐strategist to r‐strategist ratios to forest degradation decreased and increased with increased RRs of soil pH and soil C to nitrogen ratio (C:N), respectively. Forest degradation increased the bacterial alpha‐diversity indexes, of which the RRs increased and decreased as the RRs of soil pH and soil C:N increased, respectively. The overall RRs across all the forest degradation types ranked as microbial C (−40.4%) > soil C (−33.3%) > microbial respiration (−18.9%) > microbial C to soil C ratio (qMBC; −15.9%), leading to the RRs of microbial respiration rate per unit microbial C (qCO2) and soil C decomposition rate (respiration rate per unit soil C), on average, increasing by +43.2 and +25.0%, respectively. Variances of the RRs of qMBC and qCO2 were significantly explained by the soil C, soil C:N and mean annual precipitation.

Main conclusions

Forest degradation consistently shifted soil microbial community compositions from K‐strategist dominated to r‐strategist dominated, altered soil properties and stimulated microbial activity and soil C decomposition. These results are important for modelling the soil C cycling under projected global land‐use changes and provide supportive evidence for applying the macroecology theory on ecosystem succession and disturbance in soil microbial ecology.

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Global Ecology and Biogeography

Tập 27 Số 1

110-124

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