首页> 外文期刊>Canadian Journal of Forest Research >Estimating branch production in trembling aspen, Douglas-fir, jack pine, black spruce, and balsam fir
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Estimating branch production in trembling aspen, Douglas-fir, jack pine, black spruce, and balsam fir

机译:估算颤抖的白杨,花旗松,千斤顶松,黑云杉和香脂冷杉的树枝产量

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摘要

Measuring net primary productivity of trees requires the measurement of total wood production of branches. Recent work on balsam fir (Abies balsamea) has shown that branch-wood production can be estimated as a function of foliage production. We extend the analysis to four other species found in the Canadian forest: black spruce (Picea mariana), jack pine (Pinus banksiana), Douglas-fir (Pseudotsuga menziesii), and trembling aspen (Populus tremuloides). Results show that the ratio of annual branch-wood production to annual foliage production is about 1.0 for conifer species (between 0.86 and 1.12) and 0.56 for aspen during a nondrought year. An analysis using field measurements of litterfall and stem-diameter increment from selected forested sites shows that branch-wood production accounts for a smaller proportion of aboveground net primary productivity in trembling aspen (15%-20%) than in conifer species (25%). Also, litterfall capture of small branches (<1A cm diameter) accounts for only 33% of branch detritus production in conifers and 50% in trembling aspen. This study supports the use of an alternative method for estimating branch-wood production that reduces the potential bias in field estimates of net primary productivity.
机译:测量树木的净初级生产力需要测量树枝的木材总产量。香脂冷杉(Abies balsamea)的最新研究表明,可以估计枝木产量与枝叶产量的关系。我们将分析扩展到在加拿大森林中发现的其他四个物种:黑云杉(Picea mariana),杰克松(Pinus bankiana),花旗松(Pseudotsuga menziesii)和颤抖的白杨(Populus tremuloides)。结果表明,在非干旱年份,针叶树种的年分支木材产量与年生叶子产量之比约为1.0(在0.86至1.12之间),而白杨为0.56。使用来自选定林地的凋落物和茎径增加的田间测量进行的分析表明,在颤抖的白杨中,分支木材生产占地上净初级生产力的比例(15%-20%)比针叶树种(25%)小。同样,小树枝(直径<1A厘米)的凋落物捕获仅占针叶树中树枝碎屑产量的33%,在发抖的白杨中占50%。这项研究支持使用另一种方法来估计分支木材的产量,该方法可以减少实地净初级生产力估算中的潜在偏差。

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