Summertime CO_2 fluxes from tundra of Ny-?lesund in the High Arctic

查看全文 作　　者：LI [1]Fangfang;ZHU [1,2]Renbin;BAO [1]Tao;WANG [1]Qing;XU [2]Hua

机构地区：[1]Anhui Province key Laboratory of Polar Environment and Global Change,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230036,China;[2]State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《Advances in Polar Science》索引2017年第28卷第1期,共11页

基　　金：supported by the National Natural Science Foundation of China (Grant nos.41576181 and 41176171);Specialized Research Fund for the Doctoral Program of Higher Education (Grant no.20123402110026) 摘　　要：The Arctic ecosystem, especially High Arctic tundra, plays a unique role in the global carbon cycle because of amplified warming in the region. However, relatively little research has been conducted in High Arctic tundra compared with other global ecosystems. In the present work, summertime net ecosystem exchange(NEE), ecosystem respiration(ER), and photosynthesis were investigated at six tundra sites(DM1–DM6) on Ny-?lesund in the High Arctic. NEE at the tundra sites varied between a weak sink and strong source(-3.3 to 19.0 mg CO_2·m^(-2)·h^(-1)). ER and gross photosynthesis were 42.8 to 92.9 mg CO_2·m^(-2)·h^(-1) and 54.7 to 108.7 mg CO_2·m^(-2)·h^(-1), respectively. The NEE variations showed a significant correlation with photosynthesis rates, whereas no significant correlation was found with ecosystem respiration, indicating that NEE variations across the region were controlled by differences in net uptake of CO_2 owing to photosynthesis, rather than by variations in ER. A Q_(10) value of 1.80 indicated weak temperature sensitivity of tundra ER and its response to future global warming. NEE and gross photosynthesis also showed relatively strong correlations with C/N ratio. The tundra ER, NEE, and gross photosynthesis showed variations over slightly waterlogged wetland tundra, mesic and dry tundra. Overall, soil temperature, nutrients and moisture can be key effects on CO_2 fluxes, ecosystem respiration, and NEE in the High Arctic. 关键词：CO2通量北极地区苔原带夏季高纬度全球生态系统生态系统呼吸净光合速率

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Summertime CO_2 fluxes from tundra of Ny-?lesund in the High Arctic

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