中国农业科学Issue(22)：4726-4732,7.DOI:10.3864/j.issn.0578-1752.2013.22.010
硝化和反硝化过程对林地和草地土壤N2O排放的贡献
Contribution of Nitrification and Denitrification to the Nitrous Oxide Emission from Forest and Grassland Soils
摘要
Abstract
[Objective]It is of great significance to explore the contribution of nitrification and denitrification to the N2O emission from forest and grassland soils under aerobic condition, and to compare the response of the contribution to temperature change.[Method]An laboratory aerobic (60%water holding capacity) incubation experiment was conducted at 10℃ and 15℃ to measure the atom 15N excess of ammonium, nitrate, and nitrous oxide using 15N isotope tracers, the contribution of nitrification and denitrification to the N2O emission was calculated. [Result] Under aerobic condition, both processes occurred simultaneously and were involved in N2O production, 53.1%-72.0%of N-N2O came from nitrification, which is the main source of N2O from soils. The average contribution of denitrification to N2O emission was 44.9%for forest soil, which is significantly higher than grassland soil (28.9%), while nitrification of forest soil contributed 55.1% to N2O emission, which is significantly lower than grassland soil (71.1%). Increasing temperature from 10℃ to 15℃ increased N2O emission significantly for both two soils, but had no effects on the relative contribution of nitrification and denitrification to N2O emissions.[Conclusion]Microbial transformation of nitrification is the main source of N2O from soils under aerobic condition, however, the proportion of N2O emitted from denitrification should not be neglected.关键词
硝化/反硝化/N2O/15N/林地/草地Key words
nitrification/denitrification/N2O/15N/forest/grassland引用本文复制引用
李平,郎漫..硝化和反硝化过程对林地和草地土壤N2O排放的贡献[J].中国农业科学,2013,(22):4726-4732,7.基金项目
国家自然科学基金项目（41301345，41101284）、江苏省高校自然科学研究计划项目（12KJB210004）、江苏省农业气象重点实验室开放基金项目（KYQ1209）、江苏高校优势学科建设工程 （）
