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Nitrogen deposition and management practices increase soil microbial biomass carbon but decrease diversity in Moso

Quan Li1, Xinzhang Song1, Honghao Gu1

  • 1The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China.

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Summary
This summary is machine-generated.

Intensive management and nitrogen addition in Moso bamboo plantations boosted soil microbial biomass carbon but reduced bacterial diversity. Management practices had a greater impact than nitrogen deposition on soil microbes.

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Area of Science:

  • Soil science
  • Microbiology
  • Ecology

Background:

  • Soil microbial communities are vital for carbon (C) and nitrogen (N) cycling and ecosystem function.
  • The impacts of nitrogen (N) deposition and land management on soil microbes remain unclear.
  • Moso bamboo plantations are significant ecosystems where understanding these impacts is crucial.

Purpose of the Study:

  • To investigate the effects of N deposition and management practices on soil microbial biomass carbon (MBC) and community composition in Moso bamboo plantations.
  • To determine the relative influence of management practices versus N deposition on soil microbial properties.

Main Methods:

  • Utilized high-throughput sequencing of the 16S rRNA gene to analyze bacterial community composition.
  • Applied four N addition treatments to Moso bamboo plantations under conventional (CM) and intensive management (IM) for 30 months.
  • Measured soil microbial biomass carbon (MBC) and analyzed bacterial diversity and relative abundances.

Main Results:

  • Intensive management (IM) and N addition significantly increased soil MBC and decreased bacterial diversity.
  • N addition exceeding 60 kg N∙ha⁻¹∙yr⁻¹ inhibited increases in soil MBC.
  • IM altered bacterial community structure by increasing Actinobacteria and Crenarchaeota while decreasing Acidobacteria.
  • N addition increased Acidobacteria, Crenarchaeota, and Actinobacteria, but decreased Proteobacteria.
  • Soil bacterial diversity was correlated with soil pH, C/N ratio, and nutrient availability (N, P).

Conclusions:

  • Management practices significantly influenced soil MBC and microbial diversity in Moso bamboo plantations, more so than N deposition.
  • Both intensive management and N addition can negatively impact soil bacterial diversity despite increasing microbial biomass carbon.