土壤学报2011，Vol.48Issue(1)：39-46,8.
长白山4种森林土壤反硝化潜力及产物组成
POTENTIAL AND GAS PRODUCTS OF DENITRIFICATION IN FOREST SOILS IN CHANGBAI MOUNTAIN
摘要
Abstract
Denitrification and its products (N2, N20 and NO) in four forest soils collected from the Changbai Mountains were investigated with the acetylene inhibition method, which had soil samples in flasks flooded with water and incubated anaerobically with the headspace filled with N2. The four forest soils tested were all acid, with soil pH varying in the range from 4.5 to 5.3 and organic carbon in the range of 24.6 ～ 83.0 g kg-1. The results show that the soils differed greatly in denitrification potential, following a decreasing order of Pinus koraiensis ＞ Betula platyphylla Suk. ＞ Pinus koraiensis-Picea asperata ( Mast. )-Akjes fabri ( Mast. ) ＞ Larix gmelini ( Rupr. ) in denitrification potential, which was positively and significantly related to soil organic carbon and nitrogen content (p ＜ 0. 01 ), but insignificantly to soil pH. Comparison between the treatments with acetylene and the treatments without acetylene indicates that during the period of incubation, N20 was always the dominant product of denitrification, accounting for 50％ ～ 85 ％ of the total denitrification products, which did not vary much with the time of incubation and was weakly and negatively related to soil pH(p =0. 22). NO was a minor product of denitrification, accounting only for 0. 2％～2. 4％ , and in a significant negative logarithm relationship with soil organic carbon content (p ＜ 0. 05). These results imply that denitrification process would not effectively transform reactive nitrogen into inert nitrogen (N2) in the Changbai Mountain forest soils and the significance of the denitrification in removing reactive nitrogen should be re-assessed.关键词
长白山/反硝化势/森林土壤/N2O/NO/N2Key words
Changbai Mountain/ Denitrification potential/ Forest Soil/ Nitrous oxide/ Nitric oxide/ Dinitrogen分类
农业科技引用本文复制引用
吕海霞,周鑫斌,张金波,蔡祖聪..长白山4种森林土壤反硝化潜力及产物组成[J].土壤学报,2011,48(1):39-46,8.基金项目
中国科学院知识创新工程重要方向项目(KZCX2-YW-QN405)、国家自然科学基金重点项目(40830531)、土壤与农业可持续发展国家重点实验室开放基金(0812000030)资助 （KZCX2-YW-QN405）
