中文摘要：

以吉安市城郊各类典型土地利用方式下的土壤为研究对象,选取菜地（V）、城市绿地（G）、林地（F）、稻田（P）四种土地利用类型,分析不同土壤0～10cm和10～20cm层次中的氮素形态及其含量。结果表明：吉安市城郊地区表层0～10cm土壤全氮含量为564～964mg·kg-1,土壤中以稻田最高,平均含量为964mg·kg-1,其次是菜地、绿地和林地土壤,其平均含量分别为769,646和564mg·kg-1;铵态氮和水解氮在稻田0～10cm土壤中的平均含量分别为99.2mg·kg-1和120mg·kg-1,远高于菜地、绿地和林地;土壤硝态氮含量为3.08～27.2mg·kg-1,硝态氮在4种土地利用类型中土壤含量大小顺序大致为：菜地≈绿地〉稻田〉林地。不同形态的氮素含量在10～20cm土壤中的变化规律与0～10cm基本相同;对于同一土地利用类型土壤不同层次间的各种氮素含量,均是0～10cm高于10～20cm。

英文摘要：

This study was set up to characterize the effect of land use on soil nitrogen and its transformation in suburb soil in Ji＇an city,soils under four types of land use were employed,i.e.,vegetable land（V）,green land（G）,forest land（F） and paddy field（P）.The results showed that the greatest total nitrogen in top soil layer（0~10 cm） was in the paddy land,followed by vegetable land and green land,and the least was in forest land soil.The mean value from the greatest to the least was 964,769,646 and 564 mk·kg-1,respectively.In 10~20 cm soil layer,the average concentration of the total nitrogen was 769 mg·kg-1 in paddy soil,which is higher than that in the other three land use types.The average concentration of NH4＋-N and hydrolysis N in 0-10 cm paddy soil layer is 99.2 and 119 mg·kg-1,respectively,far higher than that in other three land use types,while NO3--N in different land use types was similar,range in from 11.1 to 27.2 mg·kg-1.Soil NH4＋-N,NO3--N and hydrolysis N concentration in 10~20 cm layer in different land use soils showed the similar changes as those in top layer（0~10 cm）.The results also showed that the different nitrogen concentrations at 0-10 cm soil layer was greater than those at 10~20 cm soil layer in the same land use types.