帽儿山地区不同类型河岸带土壤的反硝化效率  

Soil denitrification rates in different type riparian zones in Maoershan mountainous region of China.

作　　者：王庆成[1] 崔东海[1] 王新宇[1] 吕跃东[1] 姚琴[1] 乔树亮[1] 韩壮行[1] 

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《应用生态学报》2007年第12期2681-2686,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目(30370277).

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．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.

关 键 词：河岸带 森林 农田 土壤 反硝化 

分 类 号：S714[农业科学—林学]