Additive Tree Biomass Equations for Midrotation Loblolly Pine Plantations
Additive Tree Biomass Equations for Midrotation Loblolly Pine Plantations
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DOI：
10.5849/forsci.14-193
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发表时间：
2015-08
期刊：
影响因子：
1.4
通讯作者：
Dehai Zhao;Michael B Kane;D. Markewitz;R. Teskey;M. Clutter
中科院分区：
文献类型：
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作者：
Dehai Zhao;Michael B Kane;D. Markewitz;R. Teskey;M. Clutter
生物量估计是计算森林生物质能源、碳储存和固存以及检查森林生产力和养分循环的先决条件。根据火炬松114块地456株样木12、15、16年生的生物量破坏性取样数据，建立了两个非线性加性树木生物量方程组。一种是以胸径、树高、活冠长、活冠宽、活冠底径为基础，另一种是仅以胸径和树高为基础。该系统保证了生物量方程的可加性。非线性看似不相关回归（NSUR）的方法被用来解释生物量方程之间的内在相关性，异方差性通过为每个方程设置一个唯一的加权函数来解决。[1]两个生物量方程系统与以前发表的方程进行了比较，新的方程提供了更准确的预测，特别是关于分支和叶生物量。新的系统可以用来准确地估计树的组成部分或总树地上生物量的中轮火炬松人工林在美国东南部。
Biomass estimation is a prerequisite for calculating biomass energy, carbon storage, and sequestration of forests and for examining forest productivity and nutrient cycling. With destructive biomass sampling data from 456 sampled trees on 114 plots of loblolly pine culture and density studies at ages 12, 15, and 16, two systems of nonlinear additive tree biomass equations were developed. One was based on DBH, tree height, live crown length and width, and diameter at live crown base, and the other was based on DBH and tree height only. The systems guarantee additivity in biomass equations. The nonlinear seemingly unrelated regressions (NSUR) approach was used to account for the inherent correlation among the biomass equations, and heteroscedasticity was addressed by having a unique weighting function for each equation. 1 Both systems of biomass equations were compared with previously published equations and the new ones provided more accurate predictions, especially with respect to branch and foliage biomass. The new systems can be used to accurately estimate tree component or total tree aboveground biomass of midrotation loblolly pine plantations in the southeastern United States.