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Continental-Scale Paddy Soil Bacterial Community Structure, Function, and Biotic Interaction.

Hong-Yi Li1, Hang Wang1,2, Xin-Hua Tao1

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Summary
This summary is machine-generated.

Rice paddy soil bacteria are less diverse and have unique compositions compared to nonpaddy soils. Climate and soil factors shape these bacterial communities, influencing rice yield and soil sustainability.

Keywords:
agriculturebiogeochemical turnoverbiogeographysoil microbiota

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Area of Science:

  • Microbial Ecology
  • Soil Science
  • Agricultural Science

Background:

  • Rice paddy soils host crucial microbiota for rice yield and soil health.
  • Continental-scale biogeographic patterns of these soil microbiota are not well understood.
  • Human activities significantly shape paddy soil microbiomes, impacting agriculture.

Purpose of the Study:

  • To characterize and compare soil bacterial communities in Chinese rice paddies versus nonpaddy soils.
  • To investigate the biogeographic patterns and assembly processes of paddy soil bacteria at a continental scale.
  • To identify key environmental factors and microbial taxa influencing paddy soil bacterial community structure.

Main Methods:

  • Characterization of soil bacteria from four Chinese rice-growing regions and comparison with nonpaddy soils.
  • Analysis of taxonomic and functional composition, and co-occurrence network topology.
  • Statistical modeling to determine the influence of stochastic/deterministic processes and environmental factors.

Main Results:

  • Paddy soil bacteria exhibited significantly lower diversity and unique taxonomic/functional composition compared to nonpaddy soils.
  • Community assembly was shaped by both stochastic and deterministic processes, with a stronger deterministic signature in paddy soils.
  • Climatic factors (precipitation, temperature) were primary drivers, influencing community structure via keystone taxa (e.g., Anaerolineales, Deltaproteobacteria).

Conclusions:

  • Paddy soil bacterial communities possess distinct biogeographic patterns and network structures at a continental scale.
  • Environmental factors, particularly climate, exert significant influence on these communities, mediated by keystone taxa.
  • Understanding these unique microbial patterns is vital for enhancing rice productivity, resilience, and agricultural soil sustainability.