有机肥对亚高山山地草甸植被群落特征和土壤养分的影响OA

[Objective]This study aimed to evaluate the effects of organic fertilizer application on soil nutrients and vegetation community characteristics in subalpine meadow ecosystems,in order to mitigate declines in soil fertil-ity and vegetation cover associated with excessive chemical fertilizer use.[Method]Six organic fertilizer application rates were established(O1:0.225 kg/m2,O2:0.375 kg/m2,O3:0.525 kg/m2,O4:0.675 kg/m2,O5:0.825 kg/m2,O6:0.650 kg/m2).Vegetation community characteristics,soil physicochemical properties,and soil enzyme activities were analyzed using correlation analysis and redundancy analysis(RDA).[Result]Organic fertilizer application sig-nificantly increased aboveground biomass,with the O5 treatment yielding the highest biomass,44.74%greater than the control.Soil organic matter,total nitrogen,alkali-hydrolyzed nitrogen,available phosphorus,and urease activity were significantly enhanced.Correlation analysis and redundancy analysis indicated that aboveground biomass was positively correlated with pH,organic matter,total nitrogen,alkali-hydrolyzed nitrogen,total phosphorus,available phosphorus,urease,and sucrase activity.The Pielou index was positively correlated with available phosphorus,the Simpson index was positively correlated with alkali-hydrolyzed nitrogen content,and the Shannon-Wiener index was positively correlated with soil pH.[Conclusion]Organic fertilizer application significantly improves both the pro-ductivity and soil fertility in subalpine mountain meadow,with medium to high application rates showing the most pro-nounced effects.These findings provide a theoretical basis for the application of organic fertilizer in the restoration and sustainable management of degraded grasslands.