北京林业大学学报2017，Vol.39Issue(3)：74-80,7.DOI:10.13332/j.1000--1522.20160103
氮素化学形态及添加剂量对温带森林土壤N2O排放的影响
Effects of different nitrogen addition forms and levels on N2O emission in the temperate forest soil
摘要
Abstract
Nitrous oxide ( N2O) emission can be affected by the amounts and forms of nitrogen ( N) available in soils. To improve our understanding of the response of N2O emission to different N addition levels and forms, a manipulative field experiment was conducted to investigate the effects of different forms ( ammonium sulfate, As:( NH4 ) 2SO4; sodium nitrate, Na:NaNO3; ammonium nitrate, AN:NH4NO3 ) and levels ( control:0 kg/( ha·year);low N, LN:50 kg/( ha·year);MN:100 kg/( ha·year) and high N, HN:150 kg/( ha·year) ) of N addition on N2O emission of temperate Pinus tabuliformis forest soil using the static closed chamber method at Experimental Forest Station of Beijing Forestry University in Beijing, northern China. Our results showed that soil N2O emission showed a trend of seasonal variation:higher in summer ( May to August ) but relatively low in the remaining seasons. The minimum value appeared in January. Different levels of N addition increased annual N2O emission in the order of HN>MN>LN>control. The three N forms increased annual N2O emission in the order of AN>As>Na, but the difference was insignificant (P>0. 05) between As and AN or As and Na. These results suggested that the N2 O emission from temperate forest soil sensitively responded to N addition forms and levels. Inaddition, soil temperature, air temperature and water-filled pore space also influenced soil N2O fluxes. Annual soil N2O emission factors ranged from 0. 34% to 0. 94% for different N addition treatments, with an overall emission factor value of 0. 364%. The emission factor values were far less than the mean default emission factor proposed by the Intergovernmental Panel on Climate Change ( IPCC) .关键词
氮添加水平/氮添加形态/N2O通量/温带森林土壤/油松Key words
N addition level/N addition form/N2 O emission/temperate forest soil/Pinus tabuliformis分类
农业科技引用本文复制引用
许可,王春梅,张艺,杨欣桐,韩金锋,桂蓉蓉..氮素化学形态及添加剂量对温带森林土壤N2O排放的影响[J].北京林业大学学报,2017,39(3):74-80,7.基金项目
中央高校基本科研业务费专项(2016JX02)、国家自然科学基金项目(41373069)、北京林业大学大学生创新训练项目(S201610022116). （2016JX02）
