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Land-use change impacts soil microbial communities. While diversity decreases in disturbed soils, functional redundancy in agriculture and pasture can maintain ecosystem functions, showing varied strategies for soil equilibrium.

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Area of Science:

  • Soil microbiology
  • Ecosystem ecology
  • Land-use change impacts

Background:

  • Soil microorganisms are sensitive indicators of environmental disturbances.
  • Alterations in soil environments affect microbial diversity and ecosystem functions.
  • Understanding microbial responses to land-use change is crucial for soil health.

Purpose of the Study:

  • To test the hypothesis that alpha diversity and functional diversity decrease from undisturbed to disturbed soils.
  • To investigate the consequences of land-use change on functional redundancy in soil ecosystems.
  • To compare soil microbiome structure and function across a land-use chronosequence.

Main Methods:

  • Utilized a soil DNA shotgun metagenomics approach.
  • Assessed the soil microbiome in a chronosequence: native tropical forest, deforestation, soybean croplands, and pasture.
  • Analyzed microbial communities across different seasons.

Main Results:

  • Agriculture and pasture soils exhibited higher microbial diversity and functional redundancy compared to native forests.
  • Forest ecosystems maintain equilibrium with lower alpha diversity but higher microbial abundance.
  • Land-use change significantly alters microbial community structure and composition.

Conclusions:

  • Ecosystem functionality is maintained through different strategies: high abundance in forests and high diversity/redundancy in agricultural systems.
  • Despite structural changes, soil ecosystem functions can be sustained post-forest conversion.
  • Microbial communities adapt to land-use changes, employing distinct mechanisms to ensure ecosystem stability.