中文摘要：

以帽儿山地区森林背景下的森林、皆伐、草地河岸带和农田背景下的森林、裸地河岸带土壤为研究对象，采用硝态氮消失法，研究了不同背景下各类型河岸带的反硝化强度及其影响因素．结果表明：各类型河岸带中，农田背景下的森林河岸带土壤反硝化强度最大，其硝态氮消失率的变化范围为46．79％～91．13％，农田背景下的裸地河岸带土壤反硝化强度最小，其硝态氮消失率的变化范围为15．64％～81．84％；森林背景下土壤反硝化强度的大小顺序为皆伐河岸带〉森林河岸带〉草地河岸带，其硝态氮消失率的变化范围依次为42．06％～90．39％、28．24％～85．73％、21．44％～83．11％．研究区河岸带表层土壤的反硝化强度大于底层．河岸带土壤反硝化强度均受可利用碳、硝态氮的限制，各类型河岸带以农田背景下森林河岸带土壤反硝化潜力最大．

英文摘要：

Soil samples were collected from forested, clear-cut, and grassy riparian zones under forest background and from forested and barren riparian zones under cropland background in the Maoershan mountainous region of China. The samples were incubated in laboratory, and their denitrification potentials were determined by nitrate-deduction method. The results showed that under cropland background, soil denitrification rate was the highest in forested riparian zone and the lowest in barren riparian zone, with the deduction rate of nitrate varied from 46.79%-91.13% and 15.64% -81.84%, respectively. Under forest background, soil denitrification rate decreased in the order of clearcut 〉 forested 〉 grassy riparian zone, with the deduction rate of nitrate being 42.06%- 90.39%, 28.24%-85.73% and 21.44%-83.11%, respectively. The denitrification rate was higher in subsurface layer than in deeper layer, and the denitrification potential was limited by the available carbon and nitrate, being the greatest in the forested riparian zone under cropland background.