Boreal forests account for roughly one third of the carbon sequestered in terrestrial ecosystems, and the high-latitude boreal ecosystem they make up has been consequently vulnerable to recent climate change. This study investigated stem respiration of Alaska dominant black spruce trees in interior Alaska during the growing season of 2007. The continuous measurement of stem respiration was conducted in black spruce trees of four different ages (4.3, 7.2, 9.8, and 13.5 cm in diameter at breast height (DBH)) in interior Alaska, using a CO₂ analyzer, a 12-V pump, chambers, and a data-logger. Mean stem respiration is 0.014 ± 0.006 mg CO₂ m⁻² s⁻¹ (range 0.003–0.039 mg CO₂ m⁻² s⁻¹) in different aged four black spruce trees, indicating remarkably temporal variations in stem respiration with temperatures in air and stem. We found that metabolism is 1.5-fold higher in the younger black spruce tree than in the older. Temperatures in air and stem are significant regulators in regulating stem respiration. The stand-level annual stem respiration simulated by Q₁₀ value based on air temperature is 73.9 g CO₂ m⁻², corresponding to 5.0% of the ecosystem respiration (Re) estimated by eddy covariance tower in 2007. Our findings demonstrate that stem respiration is a significant component in the scale-up of the regional carbon budget in a black spruce forest of interior Alaska.

北方森林约占陆地生态系统中固碳的三分之一，因此它们构成的高纬度北方生态系统很容易受到近期气候变化的影响。本研究调查了 2007 年阿拉斯加内陆地区阿拉斯加优势黑云杉树的茎呼吸。对四个不同树龄（4.3、7.2、9.8 和 13.5 厘米）的黑云杉树进行茎呼吸的连续测量。胸部高度 (DBH)）在阿拉斯加内部，使用 CO ₂分析仪、12 V 泵、腔室和数据记录器。平均茎呼吸为 0.014 ± 0.006 mg CO ₂ m ^-2 s ^-1（范围 0.003–0.039 mg CO ₂ m ^-2 s^-1 ) 在不同年龄的四棵黑云杉树中，表明茎呼吸随空气和茎中温度的显着时间变化。我们发现，较年轻的黑云杉树的新陈代谢比较老的黑云杉树高 1.5 倍。空气和茎中的温度是调节茎呼吸的重要调节器。基于气温的 Q ₁₀值模拟的林分年度茎呼吸为 73.9 g CO ₂ m ^-2，相当于 2007 年涡度协方差塔估计的生态系统呼吸 (Re) 的 5.0%。我们的研究结果表明茎呼吸是阿拉斯加内陆黑云杉林区域碳收支扩大的重要组成部分。