Microbial Interactions Related to N₂O Emissions and Temperature Sensitivity from Rice Paddy Fields

Area of Science:

• Environmental microbiology
• Soil science
• Climate change research

Background:

• Soil microorganisms are key drivers of nitrous oxide (N2O) emissions, a potent greenhouse gas.
• Understanding the soil microbiome's role in N2O emissions and temperature sensitivity is vital for predicting soil-climate feedback.
• The contribution of microbial community interactions to N2O dynamics has been largely overlooked.

Purpose of the Study:

• To identify core microbial species pairs linked to N2O emissions and temperature sensitivity in paddy fields.
• To investigate the influence of within- and between-group microbial interactions on N2O emissions.
• To enhance the predictability of soil-climate feedback under rising temperatures.

Main Methods:

• Integrated analysis of archaeal, bacterial, fungal, algal, and microfaunal communities.
• Identification of core species pairs within the soil microbiome.
• Quantification of contributions from within- and between-group microbial interactions to N2O emissions.

Main Results:

• Both between-group interactions (bacterial and archaeal) and within-group interactions (bacterial) significantly contribute to N2O emissions and temperature sensitivity.
• Between-group interactions (32-33%) had a greater contribution than within-group interactions (10-18%).
• Microbial keystone species and network associations play a critical role in controlling N2O production.

Conclusions:

• Soil microbiome interactions are crucial regulators of N2O emissions and their response to temperature changes.
• Understanding these interactions is essential for improving climate models and mitigating greenhouse gas emissions.
• This study highlights the importance of microbial community structure and function in biogeochemical cycles.