An empirical ecological-type model for predicting stone pine (Pinus pinea L.) cone production in the Northern Plateau (Spain)

Calama, Rafael; Gordo, F.J.; Mutke, Sven; Montero, Gregorio

doi:10.1016/j.foreco.2007.09.079

Cited by 57 publications

(53 citation statements)

References 30 publications

(31 reference statements)

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“…This fact has given impetus to several studies on the variables explaining cone and seed production for this species (Calama et al 2008 and2011;Mutke et al 2005Mutke et al , 2007Carrasquinho et al 2010). Most of these studies show significant relationship between cone and/or seed production and the climate and soil variables, sometimes expressed as ecological units.…”

Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 99%

“…Most of these studies show significant relationship between cone and/or seed production and the climate and soil variables, sometimes expressed as ecological units. Tree and stand characteristics have also been shown to be well related to cone production (Calama et al, 2008 and2011;Carrasquinho et al…”

Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 99%

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Stand, tree and crown variables affecting cone crop and seed yield of Aleppo pine forests in different bioclimatic regions of Tunisia

Ayari

Zubizarreta-Gerendiain

Tomé³

et al. 2012

For. syst.

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In Tunisia, the Aleppo pine seed has a great importance, since in the last decades human consumption has risen considerable. Thus its regeneration and seed production capacities are important factors to take into account to reach the necessities of the country. To study the production of cones and seeds of Aleppo pine, Tunisia's native Aleppo pine forests were surveyed in summer 2006, using 79 plots (40 × 25 m: 1,000 m²) spread over four bioclimatic zones. Stand and tree characteristics, crown dimensions and cone/seed variables were measured from an average tree of each plot (i.e. a total of 79 trees). Recorded data were submitted to simple and multiple regression analyses for explaining the variability in crown volume and crown surface, cone number and seed yield per average tree. Results showed a negative correlation between the stand density, crown characteristics and number of cones and seeds harvested from the average tree. For crown volume and surface, age, stand density, tree height, diameter at breast height, crown diameter and crown height were important explanatory variables under multiple regression analyses. For cone number per tree, only the age, stand density and total height were the most determinant variables. Matures cone number per tree and cone mass per tree were the most informative parameters for the total seed yields per tree. Finally, forest managers should know that crown size affects cone and seed crop of the Aleppo pine individual tree grown in Tunisia, but has no effects on seed number per cone and seed mass per cone.Key words: Aleppo pine; crown dimensions; cone number; seed yields; bioclimatic zones; Tunisia. ResumenVariables de parcela, árbol y copa que afectan la producción de piñas y piñones en bosques de pino carrasco de Túnez En Túnez, la producción de piñones del pino carrasco tiene una gran importancia, ya que en las últimas décadas su consumo ha aumentado de forma considerable. Por ello, su regeneración y capacidad de producción de piñas/piñones en un factor a tener en cuenta en Túnez. En verano del 2006 se eligieron 79 parcelas de 1.000 m² (40 × 25 m) situadas en cuatro zonas bioclimáticas representativas de Túnez para el estudio de la capacidad de producción de piñas/piñones del pino carrasco. Teniendo en cuenta todos los árboles de las parcelas, se identificó el árbol promedio, del que posteriormente se medirían variables de árbol, dimensión de copa y producción de piñas/piñones. Los resultados demuestran una correlación negativa entre la densidad de la parcela, características de la copa y el número de piñas/piñones recolectados por cada árbol promedio. Para la descripción del volumen y superficie de copa, las variables más importantes fueron edad, densidad de parcela, altura y diámetro del árbol, y altura y diámetro de la copa. Las variables edad, densidad de parcela y altura del árbol fueron las más significativas para la determinación de nú-mero de piñas por árbol. Para el cálculo del total de piñones por árbol, las variables más informativas fueron el nú-mero ...

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Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 99%

Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 99%

Stand, tree and crown variables affecting cone crop and seed yield of Aleppo pine forests in different bioclimatic regions of Tunisia

Ayari

Zubizarreta-Gerendiain

Tomé³

et al. 2012

For. syst.

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“…Finally, zero-inflated modeling allows a simultaneous and correlated estimation of the parameters explaining both processes (Calama et al, 2011). It also prevents us from violating basic statistical assumptions derived from zero abundance, non-normality and inherent correlation among observations, factors which have been identified as the main impediments to modelling annual fruit production (Calama et al, 2008). Both of our modelling approaches (Electronic Appendix, Table 2) allowed us to accurately predict pod production at the tree level.…”

Section: Flowering (Temperatures In November and December) Fruiting mentioning

confidence: 99%

Inter-annual variability in Prosopis caldenia pod production in the Argentinean semiarid pampas: A modelling approach

Risio

Calama

Bogino

et al. 2016

Journal of Arid Environments

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The driest part of the Argentinean pampas is occupied by semiarid woodlands dominates by Prosopis caldenia Burkart (Calden). Calden pods are a highly valuable fodder supplement for livestock but its production is highly variable. Our objective was to analyze and model the temporal pattern in inter-annual variability of Calden pod production. Our key hypothesis is that weather conditions are the main determinant of the pod masting behavior. Tree size and climatic variables were evaluated as explanatory covariates using a zero-inflated log-normal modelling approach. The proposed final model structure incorporated 25 parameters, including four variance components, two intercepts for both the logistic and the log-normal parts of the model, and nineteen parameters associated with fixed effects. Climate had a strong influence on the flowering-fruiting Calden process and on the inter-annual variability of the final pod production at the tree level. Temperatures during bud breaking, flowering and fruit shedding, together with the precipitation from the final month of fruit shedding and the total amount of the prior vegetative cycle, were the main weather covariates that affect the processes. KeywordsZero-inflated, fruit, non-wood forest product, calden.Abbreviation list g per crown area square metre grams per square metre of crown area; ZILN zero inflated log normal

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“…Models to estimate stone pine cone production have been developed including different tree or forest stand variables (García Güemes, 1999;Cañadas, 2000;Piqué, 2003;Calama and Montero, 2007;Calama et al, 2008b). Climatic factors such as rainfall and temperature before flowering explain much of the yearly variation in yield (Mutke et al, 2005;Calama et al, 2010).…”

Section: Non-timber Product Functionsmentioning

confidence: 99%

Growth and yield models in Spain: Historical overview, Contemporary Examples and perspectives

Bravo

Álvarez‐González

Rı́o³

et al. 2011

For. syst.

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In this paper we present a review of forest models developed in Spain in recent years for both timber and non timber production and forest dynamics (regeneration, mortality). Models developed are whole stand, size (diameter) class and individual-tree. The models developed to date have been developed using data from permanent plots, experimental sites and the National Forest Inventory. In this paper we show the different sub-models developed so far and the friendly use software. Main perspectives of forest modeling in Spain are presented.Key words: timber production; non-wood production; recruitment; modeling; forest. Resumen Modelos de crecimiento y producción en España: historia, ejemplos contemporáneos y perspectivasEn el presente trabajo se presenta una revisión sobre los modelos forestales desarrollados en España durante los úl-timos años, tanto para la producción maderable como no maderable y, para la dinámica de los bosques (regeneración, mortalidad). Se presentan modelos tanto de rodal completo como de clases diamétricas y de árbol individual. Los modelos desarrollados hasta la fecha se han desarrollado a partir de datos procedentes de parcelas permanentes, ensayos y el Inventario Forestal Nacional. En el trabajo se muestran los diferentes submodelos desarrollados hasta la fecha,

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An empirical ecological-type model for predicting stone pine (Pinus pinea L.) cone production in the Northern Plateau (Spain)

Cited by 57 publications

References 30 publications

Stand, tree and crown variables affecting cone crop and seed yield of Aleppo pine forests in different bioclimatic regions of Tunisia

Stand, tree and crown variables affecting cone crop and seed yield of Aleppo pine forests in different bioclimatic regions of Tunisia

Inter-annual variability in Prosopis caldenia pod production in the Argentinean semiarid pampas: A modelling approach

Growth and yield models in Spain: Historical overview, Contemporary Examples and perspectives

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