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Climate change and human activities have caused a shift invegetation composition and soil biogeochemical cycles of alpine wetlands onthe Tibetan Plateau. The primary goal of this study was to test forassociations between community-weighted mean (CWM) traits, functionaldiversity, and soil properties during wetland drying. We collected soilsamples and investigated the aboveground vegetation in swamp, swamp meadow,and typical meadow environments. Four CWM trait values (specific leaf area is SLA, leaf drymatter content is LDMC, leaf area is LA, and mature plant height is MPH) for 42common species were measured across the three habitats; three components offunctional diversity (functional richness, functional evenness, andfunctional divergence) were also quantified at these sites. Our resultsshowed that the drying of the wetland dramatically altered plant communityand soil properties. There was a significant correlation between CWM oftraits and soil properties, but not a significant correlation betweenfunctional diversity and soil properties. Our results further showed thatCWM-LA, CWM-SLA, and CWM-LDMC had positive correlations with soil readilyavailable nutrients (available nitrogen, AN; available phosphorus, AP), butnegative correlations with total soil nutrients (soil organic carbon is SOC,total nitrogen is TN, and total phosphorus is TP). Our study demonstrated thatsimple, quantitative plant functional traits, but not functional diversity,are directly related to soil C and N properties, and they likely play animportant role in plant–soil interactions. Our results also suggest thatfunctional identity of species may be more important than functionaldiversity in influencing ecosystem processes during wetland drying

Community-weighted mean traits but not functional diversity determine the changes in soil properties during wetland drying on the Tibetan Plateau