Effects of Nitrogen and Phosphorus Addition on Colonization and Community Characteristics of Soil Fungi in Woody Debris
The colonization of woody debris by soil fungi significantly influences its decomposition and the structure of the fungal community.Although nitrogen and phosphorus are essential for fungal activity,the effects of external nitrogen and phosphorus inputs on the fungal colonization of woody debris remain not fully understood.Through a three-year study on the decomposition of woody debris from eight typical tree species in a subtropical forest ecosystem.This research reveals the impact of nitrogen and phosphorus supplementation on fungal transfer from adjacent soil to woody debris.This study found that between 34.5%and 40.9%of fungal species in woody debris originated from soil.The addition of phosphorus,as well as combined nitrogen and phosphorus,decreased the proportion of colonized fungi in the fungal species of the woody debris.Additionally,phosphorus addition significantly reduced their richness.The main classes of colonized fungi included Sordariomycetes,Leotiomycetes,Dothideomycetes,and Eurotiomy-cetes.Among these,Sordariomycetes was the primary colonized group,with its relative abundance in-creasing with phosphorus addition and decreasing with nitrogen addition,ranging from 62.39%to 76.35%.Furthermore,these colonized fungi predominantly belonged to saprotrophic,followed by ectomycorrhizal and other functional groups.Phosphorus addition inhibited,while nitrogen addition promoted the colonization of both saprotrophic and ectomycorrhizal fungi from soil to woody debris.Last but not the least,analysis of the ecological strategies of the colonized fungal groups in woody debris indicates a predominance of oligotrophic groups,especially under phosphorus addition.This study highlights the crucial role of soil fungi in shaping the fungal community composition of woody debris in subtropical forests and emphasizes the significant regulatory effect of nitrogen and phosphorus additions on colonization,offering important insights into the microbial mechanisms of woody debris decomposition in forest ecosystems.
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