Department of Renewable Resources, 1000 E. University Avenue, University of Wyoming, Laramie, WY 82071, USA.
Tree Physiol. 2010 Apr;30(4):441-9. doi: 10.1093/treephys/tpq001. Epub 2010 Feb 8.
We measured light-saturated photosynthesis (A(net)), foliage respiration (R(fol)) and stem respiration (R(stem)) of black spruce (Picea mariana (Mill.) B.S.P.) in heated (+5 degrees C) and control plots during 2005, 2006 and 2007 in Thompson, MB, Canada. Large greenhouses and soil-heating cables were used to maintain air and soil temperature 5 degrees C above ambient air and soil temperature. Each greenhouse contained approximately nine black spruce trees and the majority of their fine root mass. Treatments were soil and air warming, soil-only warming, greenhouses maintained at ambient air temperature and control. Gas exchange rates ranged 0.71-4.66, 0.04-0.74 and 0.1-1.0 micromol m(-)(2) s(-)(1) for A(net), R(fol) and R(stem), respectively. Treatment differences for A(net), R(fol) and R(stem) were not significant in any of the 3 years of measurements. The results of this experiment suggest that in a warmer climate, black spruce may not have significant changes in the rate of photosynthesis or respiration.
我们在加拿大马尼托巴省汤普森的加热（+5°C）和对照小区中，于 2005 年、2006 年和 2007 年测量了黑云杉（Picea mariana (Mill.) B.S.P.）的光饱和光合作用（A(net)）、叶片呼吸（R(fol)）和茎呼吸（R(stem)）。大型温室和土壤加热电缆用于将空气和土壤温度维持在比环境空气和土壤温度高 5°C。每个温室大约包含九棵黑云杉和它们大部分的细根质量。处理措施包括土壤和空气加热、仅土壤加热、温室保持环境空气温度和对照。气体交换率分别为 0.71-4.66、0.04-0.74 和 0.1-1.0 微摩尔 m(-)(2) s(-)(1)，用于 A(net)、R(fol)和 R(stem)。在这 3 年的测量中，A(net)、R(fol)和 R(stem)的处理差异均不显著。该实验的结果表明，在更温暖的气候下，黑云杉的光合作用或呼吸速率可能不会发生显著变化。
