Abstract: As a symbiont widely existing on the earth, mycorrhiza plays a vital role in plant growth, community construction, and soil nutrient cycling. Under the background of global change, the changes in its community and function profoundly affect soil carbon decomposition and the state of carbon sources and sinks. Currently, although there are many studies on mycorrhiza, due to factors such as the complex interaction between mycorrhiza and other elements in the soil, there are still significant limitations in our understanding of the mechanisms by which mycorrhizal types affect soil carbon sequestration and decomposition in the context of climate warming. By integrating relevant cutting-edge research results at home and abroad, this paper discusses the role of different mycorrhizal types (such as ectomycorrhiza and arbuscular mycorrhiza) in soil carbon sequestration, focuses on exploring the occurrence mechanism of mycorrhiza-mediated "nitrogen competition" and its impact on soil carbon decomposition, and analyzes the changes and mechanisms of mycorrhizal fungal communities and carbon sink functions in the context of climate warming. On this basis, the paper prospects the key directions that need to be focused on in future mycorrhiza-related research, in order to provide a scientific basis for accurately understanding the process of forest soil carbon cycling and conducting research on the relationship between mycorrhiza and carbon in ecosystems under the background of climate change.

Key words: Mycorrhiza, Soil Carbon Sequestration, Soil Carbon Decomposition, Climate Warming, "