生态学杂志2013，Vol.32Issue(8)：1994-2001,8.
青藏高原高寒草甸非生长季温室气体排放特征及其年度贡献
Non-growth season's greenhouse gases emission and its yearly contribution from alpine meadow on Tibetan Plateau of China
摘要
Abstract
Alpine meadow is widely distributed on the Tibetan Plateau.The studies on the greenhouse gases (GHGs) flux in the alpine meadow are mostly carried out during growing season,but scarcely quantified during non-growing season.By using static chamber technique and gas chromatography,this paper studied the characteristics of CO2,CH4,and N2O fluxes in this alpine meadow during non-growing season.The mean fluxes of CO2,CH4,and N2O were 89.33 mg·m-2 ·h-1,-11.35 μg· m-2 ·h-1,and 8.02 μg· m-2 ·h-1,and the cumulative fluxes were 280.01 g · m-2,-124.74 mg · m-2,and 39.51 mg · m-2,respectively.Therefore,this alpine meadow was performed as the sources of CO2 and N2 O and the sink of CH4 during nongrowing season.The cumulative CH4,CO2 and N2O fluxes during non-growing season contributed 13.33％,53.47％ and 62.67％ of the total in a whole year.During freeze-thawing period (April,2012),cumulative CH4 flux was smaller,only contributing 4.5％ of the total during non-growing season,whereas the cumulative CO2 and N2O fluxes were larger,contributing 25.8％ and 20.8％,respectively.The CO2 flux during non-growing season had significant positive correlations with air temperature,soil temperature at the depths of 5 cm and 10 cm,and soil moisture at depth 5 cm.Our results showed that though the cumulative CH4 flux during freezethawing period only occupied a smaller part of that during non-growing season,the cumulative CH4 and N2O fluxes during non-growing season contributed more than 50％ of the total in a whole year,which should not be neglected in the estimation of the GHGs fluxes and their global warming potential in the alpine meadow on the Tibetan Plateau.关键词
青藏高原/高寒草甸/温室气体通量/非生长季/冻融期Key words
Tibetan Plateau / alpine meadow/ greenhouse gases flux/ non-growing season/ thawing period分类
生物科学引用本文复制引用
王广帅,杨晓霞,任飞,张振华,贺金生..青藏高原高寒草甸非生长季温室气体排放特征及其年度贡献[J].生态学杂志,2013,32(8):1994-2001,8.基金项目
中国科学院重要方向性项目(KZCX2-YW-JC404)和国家自然科学基金项目(31270481)资助. （KZCX2-YW-JC404）
