西班牙核桃(Juglans x intermedia)Mj209xRa人工林树冠竞争因子的估算

J. Fernández-Moya, I. Urbán-Martínez
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引用次数: 0

摘要

在过去的几十年里,已经建立了许多以木材生产为导向的核桃林。这些种植园通常具有相对较低的初始密度(250-400棵树公顷-1),并且需要1或2次疏伐才能生产有价值的木材(75-150棵树公顷-1用于最终采伐)。因此,森林管理者需要设计何时进行疏伐以及如何进行疏伐。分析树冠面积是评估树木之间的能力和设计疏伐的一个非常有用且易于使用的工具。本研究提出了两个统计模型,以估计在5厘米(最小)至33厘米(最大)的DBH范围内,杂交核桃Mj209xRa种植林的树冠直径(CD)和树冠能力因子(CCF)作为胸径(DBH)的函数。在昆卡、赫罗纳和拉科鲁尼亚(西班牙)的Bosques Naturales SA核桃种植林中,对702棵树的CD和DBH进行了测量。CCF模型是一种工具,用于评估作为种植园测量DBH函数的树冠竞争因子,并据此决定是否应该进行疏伐并进行设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimation of crown competition factor for hybrid walnut (Juglans x intermedia) Mj209xRa planted forests in Spain
Many walnut ( Juglans spp.) planted forests oriented for timber production have been established during the last decades. These plantations usually have a relatively low initial density (250-400 trees ha -1 ) and 1 or 2 thinnings are needed for valuable timber production (75-150 trees ha -1 for final harvesting). Hence, forest managers need to design when to perform the thinnings and how to do it. Analyzing the trees crown area is a very helpful and easy-to-use tool to evaluate the competence between trees and design the thinnings. The present study proposes two statistical models to estimate Crown Diameter (CD) and Crown Competence Factor (CCF) as a function of Diameter at Breast Height (DBH) for hybrid walnut ( Juglans x intermedia ) Mj209xRa planted forests, within a DBH range between 5 cm (min) and 33 cm (max). CD and DBH were measured in 702 trees at the Bosques Naturales SA walnut planted forests in Cuenca, Girona and A Coruna (Spain). The CCF model is a tool to evaluate the Crown Competition Factor as a function of measured DBH in a plantation, and, accordingly, decide if a thinning should be done or not yet and design it.
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来源期刊
Annals of Silvicultural Research
Annals of Silvicultural Research Agricultural and Biological Sciences-Forestry
CiteScore
2.70
自引率
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