Site quality equations for <i>Pinus sylvestris</i> L. plantations in Galicia (northwestern Spain)

Diéguez-Aranda, Ulises; González, Juan Gabriel Álvarez; Barrio-Anta, Marcos; Alboreca, Alberto Rojo

doi:10.1051/forest:2005006

Cited by 39 publications

(27 citation statements)

References 36 publications

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“…The dominant height-age relationship was described using models based on those of Schumacher (1939) and Chapman-Richards (Richards, 1959) that have proved to be efficient for determining the site indexes of various conifer species (Castillo et al, 2013;Diéguez, Álvarez, Barrio, & Rojo, 2005; Vargas-Larreta, Álvarez-González, Corral-Rivas, & Aguirre-Calderón, cualquiera de los métodos descritos anteriormente ha generado gran polémica; sin embargo, en los últimos años se le ha dado mayor importancia al desarrollo de funciones de índices de sitio dinámicas con curvas polimórficas dependientes de un parámetro, pues se considera que las tendencias de las curvas modelan con mayor precisión el crecimiento en altura de los árboles (Goelz & Burk, 1992;Ker & Bowling, 1991;Payandeh & Wang, 1994).…”

Section: Models To Determine the J Deppeana Site Indexunclassified

“…The expression of these statistics is as follows: otras coníferas; no obstante, este trabajo representa la primera aproximación de análisis de J. deppeana. La relación altura dominante-edad se describió empleando los modelos base de Schumacher (1939) y el de Chapman-Richards (Richards, 1959) que han demostrado ser eficientes para la determinación de índices de sitio de diversas especies de coníferas (Castillo et al, 2013;Diéguez, Álvarez, Barrio, & Rojo, 2005; Vargas-Larreta, Álvarez-González, Corral-Rivas, & Aguirre-Calderón, 2010). El Cuadro 1 presenta dichos modelos probados en sus expresiones ADA y GADA, a partir de las ecuaciones base.…”

Section: Analysis and Comparison Of Modelsunclassified

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Modelo compatible de altura dominante - índice de sitio para táscate (Juniperus deppeana Steud.)

Rodríguez-Carrillo¹,

Cruz-Cobos²,

Vargas-Larreta³

et al. 2015

Rev Cha Se Cie For y del Amb

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T he aim of this study was to determine the site quality of juniper (Juniperus deppeana Steud.) in the San Dimas region of the state of Durango, Mexico, using the site index method. The database comes from stem analysis of 43 trees felled in harvesting activities. The Chapman-Richards and Schumacher models, by means of the algebraic difference and generalized algebraic difference approaches, were tested to determine the site index; in addition, the error structure was modeled with a second-order autoregressive model to remedy the dependency of existing longitudinal errors. The results showed that the Chapman-Richards model in generalized algebraic difference form provided the best fit according to the adjusted coefficient of determination (R 2 adj = 0.98) and root mean square error (RMSE = 0.46 m). Plotting of the quality curves generated with this model, superimposed on the observed heights, corroborated the goodness of fit of the model selected. The equation obtained with the generalized algebraic difference approach directly estimates the dominant height and site index at any height and base age.Resumen E l objetivo de este trabajo fue determinar la calidad de estación de táscate (Juniperus deppeana Steud.), a través del método de índice de sitio, en la región de San Dimas, Durango. La base de datos proviene de 43 análisis troncales de árboles derribados en actividades de aprovechamiento. Los modelos de Chapman-Richards y de Schumacher, mediante los procedimientos de diferencias algebraicas y diferencias algebraicas generalizadas, se probaron para determinar el índice de sitio; además, se modeló la estructura del error con un modelo autorregresivo de segundo orden para corregir la dependencia de errores longitudinales presentes. Los resultados mostraron que el modelo de ChapmanRichards en diferencias algebraicas generalizadas presentó el mejor ajuste de acuerdo con el coeficiente de determinación ajustado (R 2 adj = 0.98) y la raíz del cuadrado medio del error (RCME = 0.46 m). La representación gráfica de las curvas de calidad generadas con este modelo, sobrepuestas a las alturas observadas, corroboraron la bondad de ajuste del modelo seleccionado. La ecuación obtenida con la metodología de diferencias algebraicas generalizadas estima directamente la altura dominante y el índice de sitio a cualquier altura y edad de referencia.

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Section: Models To Determine the J Deppeana Site Indexunclassified

Section: Analysis and Comparison Of Modelsunclassified

Modelo compatible de altura dominante - índice de sitio para táscate (Juniperus deppeana Steud.)

Rodríguez-Carrillo¹,

Cruz-Cobos²,

Vargas-Larreta³

et al. 2015

Rev Cha Se Cie For y del Amb

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“…In addition, it can be included to project the growth of the species in a reliable way, as mentioned by Diéguez-Aranda et al (2005). This study's applicability is restricted to the local level (Diéguez-Aranda et al 2009) despite the high pressure of such equations demonstrated by Trincado and Leal (2006), a situation by which the tting of generalized height-diameter models, either traditionally or under the mixed-eects approach, is an alternative that extends the functionality of the information generated, reduces biases and better covers regional variability (Corral-Rivas et al 2014, Kulie²is et al 2014). Other similar works mention the goodness of t of such results in the collection of eld information and in the accuracy of the total height estimates to calculate the volume individually or by stand (Diéguez-Aranda et al , Vibrans et al 2015.…”

Section: Resultsmentioning

confidence: 99%

“…But the height curves generated with local allometric models are the most accurate in the estimates of forests or stands (Diéguez-Aranda et al 2009). Model 7, selected for being more stable, presents the smallest deviations when estimating the total height according to diameter at breast height, and according to Costas and Rodríguez (2003) it can be used reliably in estimating height and other derived variables such as the volume of the stands or for the characterization of the structure of the tree masses of this species, as well as for economizing on forest inventory costs (Trincado and Leal 2006).…”

Section: Resultsmentioning

confidence: 99%

Allometric height-diameter equations for Pinus pseudostrobus Lindl

Ramos

Magaña²,

Hernández-Ramos

et al. 2018

Ecosist. Recur. Agropec.

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ABSTRACT. Silvicultural practices used for forest management in the Indigenous Community of Nuevo San Juan Parangaricutiro (CINSJP for its initials in Spanish), Michoacan, Mexico, are important for the sustainability of its woodlands. For this purpose, techniques that provide reliable and current quantitative estimates are required. The aim was to t an equation that describes the allometric relationship between total height and normal diameter (Th-nd) of Pinus pseudostrobus in the CINJSP forests. Data were obtained from P. pseudostrobus stands that have been managed with the Silvicultural Development Method (SDM) at dierent stages according to the current forest management program. The research area is between 2,200 and 2 500 masl, has a temperate type C (w2) climate, and is located at southwest of the Purhépecha Plateau within the Trans-Mexican Volcanic Belt region. The sample size consisted of 169 total height-normal diameter (Th-nd) data pairs. Ten allometric models to evaluate the goodness of t were tested, choosing three models based on the lowest values of the sum of square errors of prediction (SSE) and the root mean squared error (RMSE), the highest adjusted coecients of determination and the signicance of their parameters. The deviations of the models were smaller than 0.01 m. The three-parameter equation T h = K + 38.06004 1+6.033101exp(0.066439dn) , proved to be statistically more stable than the rest, and it also shows deviations of less than one meter per tree and less than 1% for the entire population.Key words: Allometry, forest inventories, forest management, Pinus pseudostrobus RESUMEN. Las prácticas silvícolas empleadas para el manejo de los bosques en la Comunidad Indígena de Nuevo San Juan Parangaricutiro (CINSJP), Michoacán, México; son importantes para la sostenibilidad de sus áreas arboladas. Para ello, se requiere de técnicas que permitan realizar estimaciones cuantitativas conables y precisas. El objetivo fue ajustar una ecuación que describa la relación alométrica entre la altura total y el diámetro normal (Alt-dn) de Pinus pseudostrobus en los bosques de la CINJSP. Los datos provienen de rodales de P. pseudostrobus que han sido manejados con el Método de Desarrollo Silvicola (MDS) en diferentes etapas, de acuerdo con el programa de manejo forestal vigente. Los bosques bajo estudio se encuentran entre los 2 200 y 2 500 msnm, con clima templado tipo C (w 2 ), y se ubican al sur-occidente de la Meseta Purhépecha en el Eje Neovolcánico Transversal. El tamaño de muestra fue de 169 pares de datos de Alt-dn. Se analizaron diez modelos alométricos para evaluar su eciencia en la predicción, eligiendo tres con base a los valores menores de la suma de cuadrados del error y la raíz del cuadrado medio del error, el mayor coeciente de determinación ajustado y la signicancia de sus parámetros. La distribución fue normal y los residuales sin problemas de heterocedasticidad. Las desviaciones de los modelos fueron menores a 0.01 m. La ecuación:1+6.033101exp(0.066439dn) , de tres parámetros demostró ser ...

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“…Average wood production is around 4 to 5 m 3 ha −1 year −1 , with wide site variations [4]. Such variability seems to be caused by structure, site quality, diseases and competition [7].…”

Section: Introductionmentioning

confidence: 99%

Stand structure, competition and growth of Scots pine (Pinus sylvestris L.) in a Mediterranean mountainous environment

et al. 2007

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-The relationship between competition and tree growth was studied in four stands of Pinus sylvestris L. occurring in a continental Mediterranean mountain area (in the Guadarrama range, Spain), i.e., an uneven-aged stand, a stand with oak (Quercus pyrenaica Willd.) understorey, a plantation, and a mature even-aged stand. Competition was measured by a simple size-ratio distance-independent index and was negatively associated with tree diameter. This negative association was stronger in the uneven-aged, plantation and mature even-aged stands than in the stand with oak understorey. Competition was also negatively associated with current diameter increment. This relationship was moderately strong in the mature even-aged stand and weak in the uneven-aged stand and the plantation. In the uneven-aged and the mature even-aged stands, a weakly significant relationship was found between diameter growth and tree size, whereas these parameters were not associated in the stand with oak understorey. The competition index provided a better prediction of growth rate than the alternative use of diameter. Both diameter and basal area growth were greater in the uneven-aged than in the even-aged stands.competition / growth / Pinus sylvestris / Scots pine / stand structure Résumé -Structure des peuplements, compétition et croissance du pin sylvestre (Pinus sylvestris L.) dans un environnement montagneux méditerranéen. La relation entre compétition et croissance a été étudiée dans quatre peuplements de Pinus sylvestris L. que l'on rencontre dans la zone continentale des montagnes méditerranéennes (dans la région de Guadarrama en Espagne). Ont été pris en compte un peuplement inéquienne, un peuplement avec du chêne (Quercus pyrenaica Willd.) en sous-étage, une plantation, et un peuplement équienne âgé. La compétition a été mesurée par un index indépendant, simple rapport taille/distance, et était corrélée négativement avec le diamètre des arbres. Cette corrélation négative était plus forte dans le peuplement inéquienne, la plantation et le peuplement équienne âgé que dans le peuplement avec sous-étage de chêne. L'index de compétition était aussi corrélé négativement avec l'accroissement courant en diamètre. La relation était modérément forte dans le peuplement équienne âgé et faible dans le peuplement inéquienne et la plantation. Dans le peuplement inéquienne et le peuplement équienne âgé une relation faiblement significative a été trouvée entre croissance en diamètre et taille de l'arbre, alors que ces paramètres n'étaient pas corrélés dans le peuplement avec sous-étage de chêne. L'index de compétition fournit une meilleure prédiction du taux de croissance que le simple diamètre. La croissance en diamètre et en surface terrière était plus importante dans le peuplement inéquienne que dans le peuplement équienne âgé. compétition / croissance / pinus sylvestris / pin sylvestre / structure de peuplement

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Site quality equations for Pinus sylvestris L. plantations in Galicia (northwestern Spain)

Cited by 39 publications

References 36 publications

Modelo compatible de altura dominante - índice de sitio para táscate (Juniperus deppeana Steud.)

Modelo compatible de altura dominante - índice de sitio para táscate (Juniperus deppeana Steud.)

Allometric height-diameter equations for Pinus pseudostrobus Lindl

Stand structure, competition and growth of Scots pine (Pinus sylvestris L.) in a Mediterranean mountainous environment

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