Individual-tree diameter growth and mortality models for bottomland mixed-species hardwood stands in the lower Mississippi alluvial valley

Zhao, Dehai; Borders, Bruce E.; Wilson, Machelle

doi:10.1016/j.foreco.2004.05.043

Cited by 96 publications

(77 citation statements)

References 36 publications

(64 reference statements)

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“…When used in combination, the coefficients of these variables have both positive and negative values, confirming the assumed relationship that, for a given set of stand conditions, the basal area increment increases to a certain level and then decreases thereafter (Zhao et al, 2004).…”

Section: Modeling Diameter Increment In Pinus Occidentalis 171supporting

confidence: 64%

“…Potential predictor variables for individual tree basal area increment are DBH and/or some transformation of DBH, alone or in combination (Zhao et al, 2004). When used in combination, the coefficients of these variables have both positive and negative values, confirming the assumed relationship that, for a given set of stand conditions, the basal area increment increases to a certain level and then decreases thereafter (Zhao et al, 2004).…”

Section: Modeling Diameter Increment In Pinus Occidentalis 171mentioning

confidence: 78%

“…Compared with stand-class models, individual-tree models ensure reliable predictions for a wide range of tree sizes, sites and stand condition (Zhao et al, 2004). Individualtree models are capable of predicting the growth of an average tree of a given size for a specified stocking level and site productivity.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Stem Diameter Increment in Individual Pinus occidentalis Sw. trees in La Sierra, Dominican Republic

Bueno

Bevilacqua

2010

For. syst.

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One of the most common and important tree characteristics used in forest management decision-making is tree diameter-at-breast height (DBH). This paper presents results on an evaluation of two growth functions developed to model stem diameter increases in individual Pinus occidentalis Sw. trees in La Sierra, Dominican Republic. The first model was developed in order to predict future DBH (FDM) at different intervals of time and the other for predicting growth, that is, periodic annual diameter increment (PADIM). Each model employed two statistical techniques for fitting model parameters: stepwise ordinary least squares (OLS) regression, and mixed models. The two statistical approaches varied in how they accounted for the repeated measurements on individual trees over time, affecting standard error estimates and statistical inference of model parameters. Each approach was evaluated based on six goodnessof-fit statistics, using both calibration and validation data sets. The objectives were 1) to determine the best model for predicting future tree DBH; 2) to determine the best model for predicting periodic annual diameter increment, both models using tree size, age, site index and different indices of competitive status; and 3) compare which of these two modeling approaches predicts better the future DBH.OLS provided a better fit for both of the growth functions, especially in regards to bias. Both models showed advantages and disadvantages when they were used to predict growth and future diameter. For the prediction of future diameter with FDM, accuracy of predictions were within one centimeter for a five-year projection interval. The PADIM presented negligible bias in estimating future diameter, although there was a small increase in bias as time of prediction increased. As expected, each model was the best in estimating the response variable it was developed for.. However, a closer examination of the distribution of errors showed a slight advantage of the FDM against the PADIM. Based on this, it is proposed that the FDM model is used to estimate future diameter and periodic diameter increment (growth) of P. occidentalis.Additional key words: diameter growth, repeated measures, mixed models, OLS, site index, indices of competitive status. Resumen Modelando el incremento en diámetro del fuste en árboles individuales de Pinus occidentalis Sw. en La Sierra, República DominicanaUna de las características más empleadas e importantes utilizada en la toma de decisiones en el manejo forestal es el diámetro normal -DBH-de los árboles. En este artículo se presentan los resultados de la evaluación de dos funciones de crecimiento utilizadas para predecir el incremento futuro en diámetro normal (FDM) en intervalos de tiempo diferentes, y el crecimiento o incremento periódico anual en diámetro normal (PADIM) en árboles individuales de Pinus occidentalis, en La Sierra, República Dominicana. Se emplearon dos técnicas estadísticas para el ajuste de los parámetros: cuadrados mínimos ordinarios (OLS) por etapas de regresión...

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Section: Modeling Diameter Increment In Pinus Occidentalis 171supporting

confidence: 64%

Section: Modeling Diameter Increment In Pinus Occidentalis 171mentioning

confidence: 78%

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Modeling Stem Diameter Increment in Individual Pinus occidentalis Sw. trees in La Sierra, Dominican Republic

Bueno

Bevilacqua

2010

For. syst.

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“…Por esta razão, para descrever a competição, Zhao et al (2004) relatam que, para florestas mistas, é preferível utilizar modelos de competição dependentes da distância, já que o efeito de árvores vizinhas sob o crescimento da árvore-objetivo decresce com a distância. Entretanto, alguns autores recomendam incluir na modelagem, índices de competição que desconsideram o espaço (p.e.…”

Section: Análise Dos íNdices De Competiçãounclassified

Competição assimétrica e o incremento diamétrico de árvores individuais de Cedrela odorata L. na Amazônia ocidental

Cunha

Finger

2013

Acta Amaz.

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RESUMOUm modelo de crescimento dependente e independente da distância foi ajustado para avaliar como variáveis de competição explicam a variação do crescimento periódico em diâmetro de 132 árvores de cedro (Cedrela odorata). Utilizando a abordagem de crescimento potencial relativo (PRI), estimou-se o incremento relativo em diâmetro (IRd) a partir do produto do crescimento máximo em diâmetro (incremento potencial) e da função modificada (porção do crescimento reduzido). A significância do modelo do crescimento reduzido ajustado demonstrou influência da competição assimétrica sobre o crescimento em diâmetro, explicando 71% do total da variação e também revelou que a resposta à competição não foi constante, mas variou entre as diferentes classes de tamanho dos indivíduos arbóreos. PalavRaS-chavE: incremento periódico em diâmetro; índices de morfometria; índices de competição. Asymmetric competition and the diameter increment of Cedrela odorata L. trees in western Amazonia.aBSTRacT A dependent and independent growth distance model was fitted to evaluate how competition variables may account for the variation of periodic diameter increment of 132 Cedrela odorata trees. Using a Potential Relative Increment (PRI), the relative diameter increment (IRd) was estimated from the multiplication of maximum diameter growth (potential increment) by modified function (portion of the reduced growth due to competition by light and growth space). The significance of the reduced fitted model demonstrated the influence of asymmetric competition variables on diameter growth, explaining 71% of the total variation as well as indicated that competition responses were not constant, but it varied among the different size classes of trees.

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“…Mortality functions used to predict losses of timber consider mortality as a chance event, its probability being a function of the tree's expected longevity (Shugart, 1987). In computational terms, mortality is typically considered a dependent variable in logistic regression where independent factors typically include diameter, diameter increment, basal area and derivatives of these variables (Monserud and Sterba, 1999;Zhao et al, 2004). The commercially-meaningful mortality in managed stands is therefore frequently modelled as regular that results in overall mortality estimates being relatively low.…”

Section: Introductionmentioning

confidence: 99%

Lifespan and mortality of old oaks — combining empirical and modelling approaches to support their management in Southern Sweden

Drobyshev¹,

Niklasson²,

Linderson

et al. 2008

Ann. For. Sci.

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To cite this version:Igor Drobyshev, Mats Niklasson, Hans Linderson, Kerstin Sonesson, Matts Karlsson, et al.. Lifespan and mortality of old oaks -combining empirical and modelling approaches to support their management in Southern Sweden. Annals of Forest Science, Springer Verlag/EDP Sciences, 2008, 65 (4), pp.1. Ann. For. Sci. 65 (2008) Abstract -• Old oaks (Quercus robur L.) play an important role in the southern Scandinavian landscape by providing habitat for a wide range of species, a large proportion of them being currently on the National Redlists.• To provide support for the management of these trees, we review data on oak mortality and formulate a mortality-driven stochastic model analysing interactions between mortality rate, oak recruitment rate into 100-150 age class, and amount of oaks older than 200 years.• Empirical annual mortality rates varied between 0 and 13% with average 1.68%. Trees older 200 years had an average mortality rate of 1.1%. Oaks in the high density forests showed higher mortality (3.2%) as compared to the trees growing in the low density forests (1.2%). A 400-year long modelling exercises indicated that under current mortality rates (regular mortality being centred around 1% annually; and irregular mortality 7% with average return time of 13 years) the long-term maintenance of 20 trees older than 200 years per ha would require an input rate of 1 to 5 trees × year −1 × ha −1 into the 100-150 years old class.• The modelling highlighted the importance of initial oak abundance affecting amount of old trees at the end of shorter (100 years) simulation period.European hardwoods / conservation / dendrochronology / population dynamics / disturbance Résumé -Durée de vie et mortalité des vieux chênes : une approche empirique combinée à une modélisation pour un appui à leur gestion dans le sud de la Suède.• Les vieux chênes (Quercus robur L.) jouent un rôle important dans le paysage du sud de la Suède en procurant un habitat pour un large éventail d'espèces, une grande proportion d'entre elles étant actuellement dans les Listes rouges nationales.• Pour appuyer la gestion de ces arbres, nous avons examiné les données relatives à la mortalité des chênes et formulons un modèle stochastique de mortalité analysant les interactions entre taux de mortalité, taux de recrutement des chênes dans les classes 100-150 ans et total des chênes plus vieux que 200 ans.• Les taux empiriques de mortalité ont varié entre 0 et 13 % avec une moyenne de 1,68 %. Les arbres de plus de 200 ans présentaient un taux de mortalité de 1,1 %. Dans les plus fortes densités forestières les chênes montraient une mortalité plus élevée (3,2 %) comparativement aux arbres poussant dans des forêts de densité plus faible (1,2 %). Des exercices de modélisation sur 400 ans ont indiqué qu'en dessous d'un taux courant de mortalité (mortalité courante annelle centrée autour de 1 % et mortalité irrégulière de 7 % avec un temps de retour de 13 ans) la maintenance à long terme de 20 vieux arbres par hectare demanderait u...

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Individual-tree diameter growth and mortality models for bottomland mixed-species hardwood stands in the lower Mississippi alluvial valley

Cited by 96 publications

References 36 publications

Modeling Stem Diameter Increment in Individual Pinus occidentalis Sw. trees in La Sierra, Dominican Republic

Modeling Stem Diameter Increment in Individual Pinus occidentalis Sw. trees in La Sierra, Dominican Republic

Competição assimétrica e o incremento diamétrico de árvores individuais de Cedrela odorata L. na Amazônia ocidental

Lifespan and mortality of old oaks — combining empirical and modelling approaches to support their management in Southern Sweden

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