中文摘要：

为了解城市绿地土壤碳氮特征及影响因素，选取合肥市不同绿地类型（工厂、公园、居住区及校园绿地）土壤为研究对象，分析了其土壤有机碳、全氮、碳氮比（C／N）特征及影响因素。结果表明：绿地类型及土层深度均对土壤有机碳含量影响显著（P〈0．05），不同绿地类型0-30cm土层土壤有机碳含量为：公园绿地（7．00g·k^-1）〉校园绿地（6．87g·kg^-1）〉居住区绿地（5．70g·kg^-1）〉工厂绿地（5．01g·kg^-1），且0-10cm土层有机碳均值显著高于其下两层（P〈0．05）。绿地类型及土层深度对土壤全氮含量及C／N影响均不显著（P〉0．05）。不同绿地类型0—30cm土壤全氮含量依次为：校园（0．67g·kg^-1）〉工厂（0.55g·kg^-1）〉居住区（0.54g·k^-1）〉公园（0．50g·kg^-1）。0-30cm绿地土壤C／N依次为：公园（14．36）〉校园（10．18）〉居住区（9．38）〉工厂（9．20）。相关分析表明：0-30cm土壤C／N与土壤有机碳、NO3^--N、NH4^＋-N及全磷呈显著正相关。可见，公园、校园绿地利于土壤有机碳积累并可维持相对较高的C／N，这对改善生态环境起到积极作用。

英文摘要：

In order to evaluate characters of soil carbon and nitrogen and its controls in urban green lands, we investigated soil organic carbon, nitrogen, carbon and nitrogen ratio （C/N） and its influencing factors in urban green lands （factory green land, park green land, residential green land and campus green land）. The results showed that both green land types and soil layer had significantly influence on soil organic carbon （P〈0.05）; the mean values of soil organic carbon in 0-30 cm soil depth under different green lands were： park green land （7.00 g·kg^-1 〉 campus green-land （6.87 g·kg^-1）〉 residential green land （5.70 g·kg^-）〉 factory green land （5.01g·kg^-1, and the Content in 0-10 cm soil layer was significantly higher than the other two layers. Neither green land types nor soil layer had significant influence on nitrogen content and C/N （P〉0.05）; the content of nitrogen in 0-30 cm was. campus green land （0.67 g·kg^-1） 〉 factory green land （0.55 g·kg^-1） 〉 residential green land （0.54 g·kg^-1） 〉 park green land （0.50 g.kgl）, and C/N in park green land was the highest （14.36）, followed by campus green land （10.18）, residential green land （9.38）, factory green land （9.20）. Correlation analysis showed that C/N had a posi- tive correlation with soil organic carbon, NO3^--N, NH4^＋-N and total phosphorus. In brief, park and campus green lands are more conducive to the accumulation of soil organic carbon and maintain a relatively high C/N, which could play a positive role in improving the ecological environment.