Summertime CO2 fluxes from tundra of Ny-?lesund in the High Arctic

LI Fangfang; ZHU Renbin; BAO Tao; WANG Qing; XU Hua

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Summertime CO2 fluxes from tundra of Ny-?lesund in the High Arctic

机译：北极高地奈德勒松苔原夏季CO2通量

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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 CO2·m-2·h-1). ER and gross photosynthesis were 42.8 to 92.9 mg CO2·m-2·h-1 and 54.7 to 108.7 mg CO2·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 CO2 owing to photosynthesis, rather than by variations in ER. A Q10 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 CO2 fluxes, ecosystem respiration, and NEE in the High Arctic.

机译：由于该地区变暖，北极生态系统，特别是北极高寒带苔原，在全球碳循环中发挥着独特的作用。但是，与其他全球生态系统相比，在北极高寒带苔原上进行的研究相对较少。在目前的工作中，在北极圈内奈德勒桑德的六个苔原站点（DM1-DM6）上调查了夏季净生态系统交换（NEE），生态系统呼吸（ER）和光合作用。苔原位置的NEE在弱水槽和强水源之间变化（-3.3至19.0 mg CO2·m-2·h-1）。 ER和总光合作用分别为42.8至92.9 mg CO2·m-2·h-1和54.7至108.7 mg CO2·m-2·h-1。 NEE的变化与光合作用速率显示出显着的相关性，而与生态系统的呼吸没有显着的相关性，表明整个地区的NEE的变化受光合作用导致的净二氧化碳吸收量的控制，而不是由ER的变化控制。 Q10值为1.80表明苔原ER的温度敏感性较弱及其对未来全球变暖的响应。 NEE和总光合作用也显示出与C / N比的相对较强的相关性。苔原的ER，NEE和总的光合作用显示出在略微涝渍的湿地苔原，中度和干燥苔原上的变化。总体而言，在北极地区，土壤温度，养分和水分可能对二氧化碳通量，生态系统呼吸和NEE产生关键影响。

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《极地科学进展(英文版)》 |2017年第1期|50-60|共11页
作者
LI Fangfang; ZHU Renbin; BAO Tao; WANG Qing; XU Hua;
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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;

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;

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;

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;

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;

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;

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Summertime CO2 fluxes from tundra of Ny-?lesund in the High Arctic

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