上海植物园土壤碳分布特征及其影响因素研究OA

[Objective]This study investigates the spatial distribution characteristics of soil carbon content and its influencing factors in differ-ent areas of Shanghai Botanical Garden.[Method]Through field sampling and laboratory analysis,total carbon(TC),total organic carbon(TOC),total nitrogen(TN),and other physicochemical properties of the soil were measured.Combined with measurements of greenhouse gas(CO2 and CH4)emission rates,the variation patterns and controlling factors were analyzed.[Result]The TOC content in the botanical garden soils is lower than that of forest land in Shanghai but higher than that of coastal wetlands,and the greenhouse gas emissions are lower than those from natural wetlands and paddy fields;the TOC content in the lotus pond area and submerged walkway area is significantly lower than that in the riverbank area and large tree area;soil TC and TOC are influenced by available phosphorus(AP),TN,and pH,with AP having a signifi-cant positive effect on soil carbon content,while pH shows a significant negative effect;soil CO2 emissions are significantly affected by AP and pH.The application of phosphate fertilizers contributes to soil carbon accumulation and reduces CH4 emissions but may increase CO2 emis-sions.In contrast,nitrate nitrogen application can lower pH,enhance soil carbon storage,and simultaneously promote CO2 and CH4 release.[Conclusion]The results of this study provide a scientific basis for soil carbon management and greenhouse gas mitigation in botanical gardens.