生态学杂志2011，Vol.30Issue(6)：1045-1051,7.
青藏高原高寒草甸生长期CO2排放对气温升高的响应
Effects of elevated temperature on CO2 flux during growth season in an alpine meadow ecosystem of Qinghai-Tibet Plateau
摘要
Abstract
Two open-top chambers (OTCs) with height 0.4 m ( OTC-1 ) and 0.8 m (OTC-2) were used to simulate the global warming and to study the effects of elevated temperature on the CO2 flux during growth season in an alpine meadow ecosystem in Qinghai-Tibetan Plateau. The OTC-1 and OTC-2 had an increased mean annual temperature 1.25℃ and 3.68℃ , respectively, compared with the control. In the control, OTC-1 and OTC-2, the CO2 fluxes all showed an evident seasonal variation, and peaked at vigorous growth stage ( from July to August) , being 2.31, 2.35, and 6.38 μmol · m-2 · s-1, respectively. At different growth stages, the CO2 fluxes all showed an increasing trend with the increment of temperature, indicating that global warming could cause the increase of CO2 flux in alpine meadow. The CO2 fluxes in the control, OTC-1 and OTC-2 all had significant correlations with air temperature and the soil temperature and moisture at the depth of 5 cm. The correlations between the CO2 emission fluxes and the air temperature and soil temperature were exponential, and those between the CO2 emission fluxes and soil moisture were quadric multinomial.关键词
二氧化碳/排放通量/模拟增温/青藏高原/高寒草甸Key words
carbon dioxide/ emission flux/ simulated warming/ Qinghai-Tibetan Plateau/ alpine meadow.分类
农业科技引用本文复制引用
白炜,王根绪,刘光生..青藏高原高寒草甸生长期CO2排放对气温升高的响应[J].生态学杂志,2011,30(6):1045-1051,7.基金项目
国家重点基础研究发展计划项目(2007CB411504)和国家自然科学杰出青年基金项目(40925002)资助. （2007CB411504）
