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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Growing season energy and CO_2 exchange at a subarctic boreal woodland
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Growing season energy and CO_2 exchange at a subarctic boreal woodland

机译：北极亚寒带林地的生长季节能量和CO_2交换

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摘要

Measurements of net ecosystem exchange (NEE) of CO_2 were made via the eddy covariance technique over a boreal treeline woodland near Churchill, Manitoba, Canada during the growing season of 1997. Precipitation and temperature deviated only slightly from long-term normals and energy balance measurements were similar to those in other years. The mean daily Bowen ratio was 1.16 +- 0.12 (S.E>) and mean daily evaporation was 1.8 +- 0.19 (S.E.) mm. Mean daily energy balance closure was 0.92 +- 0.036 (S.E>). A curvilinear relationship was used to model the relationship between half-hourly NEE and photosynthetically active radiation, yielding r~2 of 0.51. Poor relationships were found between nighttime ecosystem respiration and air and soil temperatures. The best fit was found for in-canopy air temperature using average nighttime data (r~2 = 0.20). Daily NEE showed a seasonal trend with the peak uptake (6.2 g CO_2 m~(-2) d~(-1)) occurring in late July. The mean daily NEE was an uptake of 1.7 g CO_2 m~(-2) d~(-1). Accumulated NEE estimated for the 90-day measurement period was between 86 and 151 g CO_2 m~(-2). CO_2 fluxes were found to be considerably smaller than for central and southern boreal forest sites and only slightly larger than tundra sites.
机译：通过涡度协方差技术对加拿大马尼托巴省丘吉尔附近的北方林木林地在1997年的生长季节进行了CO_2净生态系统交换（NEE）的测量。降水和温度与长期正常值和能量平衡测量值仅略有差异与其他年份相似。平均每日鲍恩比为1.16±0.12（S.E>），平均每日蒸发量为1.8±0.19（S.E.）mm。平均每日能量平衡关闭为0.92±0.036（S.E>）。使用曲线关系来模拟半小时NEE与光合有效辐射之间的关系，得出r〜2为0.51。发现夜间生态系统的呼吸作用与空气和土壤温度之间的关系不佳。使用平均夜间数据（r〜2 = 0.20）可以找到最合适的顶棚温度。日NEE呈季节趋势，在7月下旬出现最大吸收量（6.2 g CO_2 m〜（-2）d〜（-1））。每天平均NEE摄入量为1.7 g CO_2 m〜（-2）d〜（-1）。在90天的测量期内估计的累积NEE在86至151 g CO_2 m〜（-2）之间。发现CO_2通量比中部和南部的北方森林地带小得多，仅略大于苔原地带。

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