The Microbial Network Stability in Cyanobacterial and Moss Biocrusts Respond Differently to Climate Warming

Area of Science:

• Soil science
• Microbiology
• Ecology

Background:

• Climate warming significantly alters soil microbial communities and network stability.
• Biological soil crusts (biocrusts) mitigate climate change impacts on soil functions and biodiversity.
• Understanding biocrust-specific responses to warming is crucial for predicting ecosystem stability.

Purpose of the Study:

• To investigate the effects of warming on microbial communities and network stability in cyanobacterial and moss biocrusts.
• To compare the resilience of microbial networks in different biocrust types under warming conditions.
• To identify mechanisms driving microbial network responses to climate warming in arid environments.

Main Methods:

• Field experiment simulating climate warming in the Mu Us Sandland, China.
• Analysis of soil microbial community structure and network properties.
• Structural Equation Modeling (SEM) to assess relationships between warming, soil moisture, and network stability.

Main Results:

• Warming increased network vulnerability and decreased robustness in cyanobacterial biocrusts.
• Reduced soil moisture and warming acted as filtering factors, lowering overall microbial network stability.
• Cyanobacterial biocrusts exhibited greater microbial network stability than moss biocrusts under warming.
• Warming reduced microbial connectivity, module hubs, and keystone phyla in both biocrust types.

Conclusions:

• Warming impairs soil microbial network stability, particularly in cyanobacterial biocrusts, by reducing connectivity.
• Cyanobacterial biocrusts demonstrate a superior capacity to maintain soil microbial network stability under climate warming.
• Shifts in network connectivity are a key mechanism underlying biocrust responses to environmental stress, emphasizing their ecological importance.