北京林业大学学报2016，Vol.38Issue(8)：54-63,10.DOI:10.13332/j.1000-1522.20160048
若尔盖湿地土壤温室气体排放对模拟氮沉降增加的初期响应
Short-term effect of increasing nitrogen deposition on greenhouse gas emissions in Zoige wetland, western China
摘要
Abstract
Elevated anthropogenic N input could affect the greenhouse gas emissions through influencing the availability of soil nitrogen ( N) , and ultimately lead to significant changes in the climate and ecological environment. Our experiment was conducted in the Zoige peatland, which is situated in the eastern Qinghai-Tibetan Plateau in China, with pronounced frigid temperate zone, semi damp grass land and humid climate. In order to explore the effect of nitrogen deposition on production and emission of greenhouse gases ( CO2 , CH4 and N2 O) from peatland during its growth cycle ( from May to September) , four different levels of nitrogen fertilizer application were designed as control (0 kg/(ha·a), CK), low nitrogen (10 kg/( ha·a) , LN) , medium nitrogen (20 kg/( ha·a) , MN) and high nitrogen (80 kg/( ha· a) , HN) , and static closed chamber combined with a gas chromatograph technique was used to measure the fluxes of three greenhouse gases. The investigation showed that the mean fluxes of CO2 , CH4 and N2 O were 224. 961±13. 875, 0. 114±0. 002, 0. 059±0. 003 mg/(m2·h) with HN level, 303. 801±11. 397, 0. 111±0. 002, 0. 047 ±0. 004 mg/( m2·h) with MN level and 212. 731 ±5. 847, 0. 083 ±0. 004, 0. 032±0. 002 mg/( m2·h) with LN level, which were all significantly higher than that of control. N application had a strong promotion to seasonal cumulative emissions of CO2, CH4 and N2O (P<0. 05). There were significantly positive correlations between increments of greenhouse gas fluxes and soil inorganic nitrogen in N treatments ( P<0. 05 ) , as well as a markedly positive correlation between growth in CO2 , CH4 fluxes and biomass increment ( P<0. 05 ); however, the correlation between incremental greenhouse gases fluxes and soil temperature or moisture factors did not change significantly due to N addition (P>0. 05). Also, N application significantly increased the global warming potential (GWP) of peatlands ( P<0. 05 ) . These results suggest that the short-term N addition would be likely to stimulate greenhouse gas fluxes in the Zoige peatland by increasing available N content and promoting plant growth. This provides a scientific basis for predicting greenhouse effect caused by N deposition in peatland soil, as well as reasonably protecting the plateau wetland ecosystem.关键词
高寒泥炭湿地/氮沉降/温室气体通量/全球增温潜势Key words
alpine peat wetland/nitrogen deposition/greenhouse gas flux/global warming potential分类
农业科技引用本文复制引用
张艺,王春梅,许可,韩金锋,杨欣桐,林嘉莉..若尔盖湿地土壤温室气体排放对模拟氮沉降增加的初期响应[J].北京林业大学学报,2016,38(8):54-63,10.基金项目
国家自然科学基金项目(41373069)、中央高校基本科研业务费专项资金(2016JX02)。 （41373069）
