Ryan Michael G, Gower Stith T, Hubbard Robert M, Waring Richard H, Gholz Henry L, Cropper Wendell P, Running Steven W
Rocky Mountain Experiment Station, USDA Forest Service, 240 West Prospect Street, 80526-2098, Fort Collins, CO, USA.
Department of Forestry, University of Wisconsin, 53706, Madison, WI, USA.
Oecologia. 1995 Feb;101(2):133-140. doi: 10.1007/BF00317276.
We estimate maintenance respiration for boles of four temperate conifers (ponderosa pine, western hemlock, red pine, and slash pine) from CO efflux measurements in autumn, when construction respiration is low or negligible. Maintenance respiration of stems was linearly related to sapwood volume for all species; at 10°C, respiration per unit sapwood volume ranged from 4.8 to 8.3 μmol CO m s. For all sites combined, respiration increased exponentially with temperature (Q =1.7, r =0.78). We estimate that maintenance respiration of aboveground woody tissues of these conifers consumes 52-162 g C m y, or 5-13% of net daytime carbon assimilation annually. The fraction of annual net daytime carbon fixation used for stem maintenance respiration increased linearly with the average annual temperature of the site.
我们通过秋季二氧化碳通量测量来估算四种温带针叶树（黄松、铁杉、红松和湿地松）树干的维持呼吸，此时生长呼吸较低或可忽略不计。所有物种的树干维持呼吸与边材体积呈线性关系；在10°C时，单位边材体积的呼吸范围为4.8至8.3 μmol CO₂ m⁻² s⁻¹。综合所有地点来看，呼吸随温度呈指数增加（Q₁₀ = 1.7，r = 0.78）。我们估计这些针叶树地上木质组织的维持呼吸每年消耗52 - 162 g C m⁻² y⁻¹，占每年白天净碳同化量的5 - 13%。用于树干维持呼吸的年度净白天碳固定比例随地点的年均温度呈线性增加。
