Ecoregional height–diameter models for Scots pine in Turkiye

IF 3.4 2区 农林科学 Q1 FORESTRY
Fadime Sağlam, Oytun Emre Sakici
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Abstract

Ecoregion-based height-diameter models were developed in the present study for Scots pine (Pinus sylvestris L.) stands in Turkiye and included several ecological factors derived from a pre-existing ecoregional classification system. The data were obtained from 2831 sample trees in 292 sample plots. Ten generalized height–diameter models were developed, and the best model (HD10) was selected according to statistical criteria. Then, nonlinear mixed-effects modeling was applied to the best model. The R2 for the generalized height‒diameter model (Richards function) modified by Sharma and Parton is 0.951, and the final model included number of trees, dominant height, and diameter at breast height, with a random parameter associated with each ecoregion attached to the inverse of the mean basal area. The full model predictions using the nonlinear mixed-effects model and the reduced model (HD10) predictions were compared using the nonlinear sum of extra squares test, which revealed significant differences between ecoregions; ecoregion-based height–diameter models were thus found to be suitable to use. In addition, using these models in appropriate ecoregions was very important for achieving reliable predictions with low prediction errors.

Abstract Image

土耳其苏格兰松树生态区域高度-直径模型
本研究针对土耳其的苏格兰松林(Pinus sylvestris L.)建立了基于生态区域的高度-直径模型,其中包括从已有的生态区域分类系统中提取的若干生态因子。数据来自 292 个样地中的 2831 棵样树。建立了 10 个广义高度-直径模型,并根据统计标准选出了最佳模型(HD10)。然后,对最佳模型进行非线性混合效应建模。经 Sharma 和 Parton 修正的广义高度-直径模型(Richards 函数)的 R2 为 0.951,最终模型包括树木数量、优势高度和胸径,每个生态区域都有一个与平均基部面积倒数相关的随机参数。使用非线性额外平方和检验比较了使用非线性混合效应模型的完整模型预测结果和简化模型(HD10)预测结果,结果显示生态区域之间存在显著差异;因此,基于生态区域的高度-直径模型是适合使用的。此外,在适当的生态区域使用这些模型对于实现可靠的预测和较低的预测误差非常重要。
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来源期刊
CiteScore
7.30
自引率
3.30%
发文量
2538
期刊介绍: The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects: Basic Science of Forestry, Forest biometrics, Forest soils, Forest hydrology, Tree physiology, Forest biomass, carbon, and bioenergy, Forest biotechnology and molecular biology, Forest Ecology, Forest ecology, Forest ecological services, Restoration ecology, Forest adaptation to climate change, Wildlife ecology and management, Silviculture and Forest Management, Forest genetics and tree breeding, Silviculture, Forest RS, GIS, and modeling, Forest management, Forest Protection, Forest entomology and pathology, Forest fire, Forest resources conservation, Forest health monitoring and assessment, Wood Science and Technology, Wood Science and Technology.
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