湖滨带水生植物-微生物介导的N2O排放研究进展OACHSSCD

Freshwater littoral wetlands are the typical ecotones between terrestrial and aquatic ecosystems.Driven by periodic water level fluctuations and mediated by aquatic plants in freshwater littoral wetlands,the dynamic oxidation-reduction gradients,along with highly active microbial metabolism,jointly regulate the production and emission dynamics of N2O.The growth and root exudates of aquatic plants foster a unique rhizosphere microbiome that is intricately linked to the nitrogen(N)cycle;these microorganisms could provide an essential N source for the growth of aquatic plants through N conversion.Therefore,the aquatic plant-microbe interactions establish the freshwater littoral wetlands as both critical zones for N-cycle processes and significant sources of N2O emissions.A systematic analysis of the spatiotemporal variations and regulatory mechanisms of aquatic plant-microbe mediated N2O emissions in freshwater littoral zones is crucial for elucidating the impacts on greenhouse gas sources and sinks and maintaining N balance in aquatic ecosystems.In this review,we first introduced the N2O dynamics mediated by aquatic plants-microorganisms in the freshwater littoral wetlands:N2O is primarily produced through several N cycle processes,including nitrification,denitrification,and nitrifier denitrification.The produced N2O may either be reduced via N2O reductase or released into the atmosphere through bubble release,concentration gradient diffusion or transport by aquatic plants.We then summarized the variation characteristics of N2O emission across different spatiotemporal scales,including daily and seasonal fluctuations,and the variations across latitudinal climate types,elevation differences and hydrological gradients.The aquatic plant-microbe mediated N2O emissions in freshwater littoral zones are both regulated by abiotic factors,e.g.,moisture,temperature,and nutrients,and biotic factors,including plant life forms and microbial communities.Finally,we presented the future research prospects to enhance our understanding of aquatic plant-microbe interactions on N2O emissions,including integrating multi-dimensional data,deepening microbiome analysis,and constructing and optimizing N2O emission estimation models.