Development of total aboveground volume equations for seven important forest tree species in France
Development of total aboveground volume equations for seven important forest tree species in France
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DOI：
10.1016/j.foreco.2006.03.013
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发表时间：
2006-07
影响因子：
3.7
通讯作者：
P. Vallet;J. Dhote;G. Moguédec;Michel Ravart;G. Pignard
中科院分区：
文献类型：
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作者：
P. Vallet;J. Dhote;G. Moguédec;Michel Ravart;G. Pignard
为了提高估计碳储存在法国森林生物量从国家森林资源清查数据，我们开发了六个物种的具体方程估计树木的地上总体积，包括商品量，树枝和细枝。方程使用胸围和总身高作为自变量。它们是由朗德省、法国北方和东部山区的同龄森林建造的。样本是在1920年至1955年期间在生长和产量永久地块中进行体积测量的档案中选择的。它由7个重要物种的4619棵树木组成：1222棵无柄橡树，1293棵普通山毛榉，347棵道格拉斯冷杉，309棵挪威云杉，389棵苏格兰松，297棵海洋松和762棵银冷杉。这些树木被砍伐，并在26个不同的森林（62立场）进行了测量。树形因子进行了分析，而不是体积，以消除异方差，和高度被取代的抗寒系数，以消除直径高度相关。分析确定了种特异性模式的发展阶段和树的抗寒性的树形变异。海洋和苏格兰松没有统计上的差异，尽管这两个物种的生态和造林情况之间存在很大的差异。这表明有可能对属于同一属的物种使用相同的体积方程。树形的区域变化进行了探讨的交叉验证技术。预测偏差没有表现出明确的地理结构。南部地区硬木的估计可能会过高5%，值得进一步测试。最近的生长变化可能略有改变树形的假设也进行了讨论。最后，一个国家规模的应用提供了生物量扩展因子与以前的研究一致，并建议这些体积方程表现良好，外推到矮林，年龄不等或混合林。
In order to improve the estimation of carbon stored in the French forest biomass from National Forest Inventory data, we developed six species-specific equations for estimating the total aboveground volume of trees, including merchantable volume, branches and twigs. Equations use circumference at breast height and total height as independent variables. They were built from even-aged forests of the Landes massif, the northern half and the eastern mountain regions of France. The sample was selected within archives of volume measurements taken in growth and yield permanent plots between 1920 and 1955. It is made up of 4619 trees belonging to seven important species: 1222 Sessile Oak, 1293 Common Beech, 347 Douglas Fir, 309 Norway Spruce, 389 Scots Pine, 297 Maritime Pine and 762 Silver Fir. These trees were felled and measured in 26 different forests (62 stands). Tree form factor was analysed, rather than volume, to remove heteroscedasticity, and height was substituted by a hardiness coefficient to remove diameter–height correlation. The analysis identified species-specific modes of variation of tree form with respect to developmental stage and tree hardiness. Maritime and Scots Pine did not differ statistically, despite large differences between ecological and silvicultural situations of both species. This suggests the possibility to use identical volume equations for species belonging to the same genus. Regional variations of tree form were explored by a cross-validation technique. Prediction biases did not exhibit a clear geographic structure. A 5% overestimation for hardwoods in southern sites is possible, and would deserve further testing. The hypothesis that recent growth changes may have slightly altered tree form is also discussed. Finally, a national-scale application provided Biomass Expansion Factors consistent with former studies and suggested that these volume equations behave well in extrapolation to coppices, uneven-aged or mixed stands.