Ecological stoichiometry characterization of Davidia involucrata in Wumeng Mountion National Nature Reserve of Yunnan Province
[Objective]This study aimed to investigate the ecological stoichiometry characterization of Davidia involucrata,a nationally protected endangered plant species,in the Wumeng National Nature Re-serve of Yunnan Province.The objective was to assess the nutrient element content and growth-limiting factors in Davidia involucrata ecosystems by examining the leaf,litter,and soil.[Method]Four sample plots were established at different elevations(labeled as Ⅰ,Ⅱ,Ⅲ,Ⅳ)in the study area.Variance analysis,multiple comparisons,and redundancy analysis were used to study the differences and correlations in carbon(C),nitrogen(N),phosphorus(P)content,and their ratios in Davidia involucrata leaves,litter,and soil.The response factors of soil stoichiometric characteristics were explored.[Result]The average leaf content of C,N,and P was 459.87,10.96,and 1.35 g/kg respectively,while the average litter content was 459.87,10.96,and 1.35 g/kg respectively.The average soil content was 74.81,7.94,and 0.79 g/kg respectively.The pattern of C,N,and P content in leaf,litter,and soil followed the order:leaf>litter>soil.Significant differences in soil C,N,and P content were observed among the different components.The order of content was Ⅳ>Ⅲ>Ⅱ>Ⅰ(Ⅰ:58.47±1.88,5.73±0.41,0.06±0.02 g/kg;Ⅱ:64.45±2.29,6.82±0.19,0.61±0.08 g/kg;Ⅲ:75.94±1.32,7.88±0.16,1.11±0.06 g/kg;Ⅳ:100.39±1.24,11.32±0.25,1.36±0.10 g/kg).Leaf and litter did not show significant differences.Significant differences were ob-served in C content among the components within each plot,with the order of leaf>litter>soil.N and P content did not show significant differences.The C:N,C:P,and N:P ratios exhibited significant differ-ences.Correlations were found between C,N,P content,and their ratios in leaf,litter,and soil.Altitude,non-capillary porosity,slope,capillary porosity,and silty sand content were identified as key environmental factors influencing soil nutrients.[Conclusion]Significant differences were observed in soil C,N,P content,and their ratios across different elevation sites in the Wumeng National Nature Reserve of Yunnan Prov-ince.However,leaf and litter did not show significant differences.Based on ecological stoichiometry charac-terization,it can be concluded that the growth of Davidia involucrata in plot IV is more likely to be re-stricted by the P element.Altitude,non-capillary porosity,slope,capillary porosity,and silty sand content were identified as key environmental factors affecting soil nutrient cycling.
Davidia involucrataecological stoichiometryleaf-litter-soilenvironmental factorsWu-meng National Nature Reserve
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万方数据
