Response of Soil Microbial Communities to Climate Change

Climate change, a complex phenomenon characterized by long-term alterations in Earth’s climate, arises from human-induced factors such as population growth, pollution, and land degradation. This escalation contributes to increased greenhouse gases (GHGs)—including nitrous oxide (N2O), methane (CH4), and carbon dioxide (CO2)—which intensify the greenhouse effect and trigger unprecedented environmental events such as droughts, fires, heatwaves, floods, and biodiversity loss. Soil microbial communities, comprising bacteria, fungi, archaea, and protozoa, form dynamic ecosystems within the soil matrix. These microorganisms play a vital role in maintaining soil health, nutrient cycling, and ecosystem processes. Their interactions with plants are essential for nutrient acquisition, utilization, and plant growth. Beneficial microbes enhance soil quality, plant health, and agricultural sustainability. The diversity of these communities greatly influences ecosystem resilience and stability, yet climate change elicits varied responses from them. This chapter explores how soil microbial communities react to extreme weather events, including drought, flooding, salinization, permafrost thaw, temperature fluctuations, fire, and elevated CO2. It also examines their role in climate change mitigation and the management of climate-related impacts. The chapter identifies a significant research gap and calls for expanded studies, particularly those considering plant–microbe interactions in the context of climate adaptation.