Temporal dynamics of the diazotrophic community during corpse decomposition

Area of Science:

• Soil Microbiology
• Ecology
• Biogeochemical Cycles

Background:

• Soil diazotrophic microbes are crucial for nitrogen input and nutrient cycling.
• Cadaver decomposition creates unique soil environments ('cadaver decomposition islands').
• The impact of corpse decomposition on soil diazotrophic communities remains poorly understood.

Purpose of the Study:

• To investigate the succession patterns of nitrogen-fixing microorganisms during animal corpse decomposition.
• To analyze the biological interactions within soil diazotrophic communities under corpse decomposition.
• To understand the influence of corpse decomposition on microbial community assembly and nitrogen cycling.

Main Methods:

• Targeted the nifH gene using high-throughput sequencing to study diazotrophic communities.
• Analyzed microbial community structure, diversity (α and β), and network interactions.
• Assessed the influence of environmental factors (NH4-N, time, total carbon) on community dynamics.

Main Results:

• Corpse decomposition significantly reduced α diversity and altered β diversity of the diazotrophic community.
• Community assembly became more stochastic under corpse decomposition, decreasing over time.
• Diazotrophic networks were simplified, and inter-population interactions were weakened.

Conclusions:

• Corpse decomposition profoundly impacts soil diazotrophic community structure and function.
• Altered diazotrophic communities may influence biological nitrogen fixation rates in terrestrial ecosystems.
• This research highlights the ecological significance of carcass decomposition in nutrient cycling.