Effects of changes in precipitation frequency and intensity on soil fungal communities in alpine wetlands on the Qinghai-Tibet Plateau
The transition of precipitation regime from high-frequency and low-intensity to low-frequency and high-intensity has become a prominent characteristic of climate change in alpine wetlands.Understanding variation in fungal communities under changing precipitation regimes is crucial for predicting the response and adaptation of ecosystems to future climate change.Based on a multi-year field control experimental platform for changes of the precipitation regime in Zoige County,this study utilized high-throughput sequencing of the internal transcribed spacer(ITS)gene and the FunGuild database to analyze the characteristics of soil fungal community diversity,composition,and functional groups under different intensities of changes in precipitation regimes,and constructed a fungal co-occurrence network.This study found that the diversity of soil fungal communities peaked under moderate changes in precipitation regimes,which was related to the significant negative correlation between soil pH and fungal diversity indices(r=-0.80--0.57).Changes in the precipitation regime altered the relative abundance of the dominant fungal communities at the phylum level,with Ascomycota and Basidiomycota showing opposite trends.Functionally,changes in precipitation regimes significantly affected the distribution of saprotrophic fungal communities.Under the severely changes in precipitation regime,the fungal community network structure became loose and its complexity decreased;whereas,moderately changes in precipitation regime facilitated the expansion and increased complexity of the fungal community network,supporting the"intermediate disturbance hypothesis."This study reveals the response and adaptation mechanisms of wetland microorganisms to climate change from a new perspective,enriching our understanding of the ecological effects of complex climate change events.
precipitation regimealpine wetlandfungal diversityfungal community functionco-occurrence network
NETL
NSTL
万方数据
