Evaluation of individual-tree growth models for Picea abies based on a case study of an uneven-sized stand in southern Sweden

IF 1.8 3区 农林科学 Q2 FORESTRY
N. Fagerberg, P. Lohmander, O. Eriksson, Jan-ola Olsson, B. Poudel, J. Bergh
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引用次数: 4

Abstract

ABSTRACT To develop recommendations for tree selection in Continuous Cover Forestry (CCF), access to valid tools for simulating growth at individual tree-level is necessary. To assist efforts to develop such tools, in this study, long-term observation data from two uneven-sized Norway spruce plots in southern Sweden are used to evaluate old and new individual-tree growth models (two established Swedish models, two new preliminary models and included as a reference, a Finnish model). The plots’ historical management records and site conditions are the same, but their last thinning treatment differs. Observed diameter increment at tree-level is investigated in relation to treatment. Individual tree growth residuals of tested models are evaluated in relation to tree diameter, treatment, projection length and sensitivity to the predictor mean stand age. Furthermore, the relations between displayed residuals and basal area local competition are analysed. The analyses indicate that active thinning made annual diameter increment independent of tree diameter above a threshold level, while the absence of thinning supported a concave relationship. All tested models displayed a significant linear bias leading to overestimation of small trees’ growth and increasing underestimations of larger trees’ growth with tree diameter. All distance-independent models displayed residual trends related to local competition.
基于瑞典南部一个不均匀林分的案例研究对云杉个体树木生长模型的评估
摘要:为了制定连续覆盖林业(CCF)的树木选择建议,有必要获得有效的工具来模拟单个树木的生长。为了帮助开发此类工具,在本研究中,使用了瑞典南部两个大小不等的挪威云杉地块的长期观测数据来评估新旧个体树木生长模型(两个已建立的瑞典模型,两个新的初步模型,作为参考,包括一个芬兰模型)。地块的历史管理记录和场地条件相同,但最后一次疏伐处理不同。观察到的树级直径增量与处理有关。测试模型的个体树木生长残差与树木直径、处理、投影长度和对预测平均林分年龄的敏感性有关。此外,还分析了显示残差与基底区局部竞争的关系。分析表明,主动疏伐使年径增量与树径无关,超过阈值水平,而不疏伐则支持凹关系。所有测试的模型都显示出显著的线性偏差,导致高估小树的生长,并随着树木直径的增加而越来越低估大树的生长。所有与距离无关的模型都显示出与当地竞争相关的残差趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.00
自引率
5.60%
发文量
26
审稿时长
3.3 months
期刊介绍: The Scandinavian Journal of Forest Research is a leading international research journal with a focus on forests and forestry in boreal and temperate regions worldwide.
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