Modelling growth of Pinus taeda and Eucalyptus grandis as a function of light sums modified by air temperature, vapour pressure deficit, and water balance

IF 1.5 4区 农林科学 Q2 FORESTRY
C. Rachid-Casnati, E. Mason, R. Woollons, J. Landsberg
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引用次数: 4

Abstract

Background: Hybrid mensurational and physiological models seek to combine precision, process explanation, simplicity in parameter definition, and ability to estimate wood products. The aim of this study was to assess the suitability and the advantages of the hybrid mensurational-physiological approach where time has been substituted for light sums in growth equations, to replace traditional time-based models in forecasting systems for Eucalyptus grandis W.Hill and Pinus taeda L. Methods: Using 974 permanent sample plots from plantations in Uruguay, we adjusted growth equations to project dominant height, net basal area, maximum diameter breast height, and standard deviation of diameters as a function of accumulated light restricted by modifiers that account for principal physiological limitations on photosynthesis. We analysed: i) the inclusion of terrain aspect and slope information for computing radiation; ii) the use of modifiers for temperature, vapour pressure deficit and water balance; iii) bias and precision of hybrid models with respect to time-based equations. Results: Growth equations showed a good fit for both species when modelled as a function of light sums modified by vapor pressure deficit, air temperature, and water balance. Accounting for slope orientation when computing light sums did not increase precision. Compared to time-based formulations, hybrid models presented a root mean squared error reduction of 10.7% and 4.5% on average for Eucalyptus grandis and for Pinus taeda, respectively, and the relationship between growth and resource availability was consistent with eco-physiological principles for both species. Conclusions: The hybrid methodology can be applied as a basis of forecasting systems for the species studies with significant advantages over time-based models, such as: (i) an increase in precision; (ii) an increase in spatial and time resolution; and (iii) the possibility of simulating the effect of changes in air temperature and water availability on tree growth.
模拟红松和大桉树生长受空气温度、蒸汽压差和水分平衡影响的光总量函数
背景:混合测量和生理模型寻求结合精度,过程解释,简单的参数定义,和估计木材产品的能力。本研究的目的是评估混合测量-生理方法的适用性和优势,该方法用时间代替生长方程中的光和,取代传统的基于时间的模型,用于大桉树和松的预测系统。利用乌拉圭人工林的974个永久样地,我们调整了生长方程,以预测优势高度、净基底面积、最大直径胸围高度和直径标准差作为累积光的函数,这些光受到修饰因子的限制,这些修饰因子是光合作用的主要生理限制。我们分析了:i)包含地形和坡度信息来计算辐射;Ii)使用改进剂来改善温度、蒸汽压差和水分平衡;Iii)混合模型相对于基于时间的方程的偏差和精度。结果:当将两个物种的生长方程建模为由蒸汽压差、空气温度和水分平衡修正的光和函数时,生长方程显示出良好的拟合性。在计算光和时考虑坡向并不能提高精度。与基于时间的模型相比,杂交模型对大桉和松的均方根误差平均分别降低了10.7%和4.5%,两种树种的生长与资源可利用性之间的关系符合生态生理原理。结论:混合方法可作为物种研究预测系统的基础,与基于时间的模型相比具有显著优势,如:(1)精度提高;(ii)空间和时间分辨率的提高;(3)模拟气温和水分有效性变化对树木生长影响的可能性。
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来源期刊
CiteScore
2.20
自引率
13.30%
发文量
20
审稿时长
39 weeks
期刊介绍: The New Zealand Journal of Forestry Science is an international journal covering the breadth of forestry science. Planted forests are a particular focus but manuscripts on a wide range of forestry topics will also be considered. The journal''s scope covers forestry species, which are those capable of reaching at least five metres in height at maturity in the place they are located, but not grown or managed primarily for fruit or nut production.
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