Cone production in young post-fire Pinus contorta stands in Greater Yellowstone (USA)

Turner, Monica G.; Turner, Devin M.; Romme, William H.

doi:10.1016/j.foreco.2006.12.032

Cited by 38 publications

(46 citation statements)

References 49 publications

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“…But, according to equation (11) the seed yields produced by the average tree may also be linked to cone characteristics such as C#/T and CMT since they were good explanatory variables of seed production. These results corroborate that tree size is the overriding factor in determining its reproduction and fructification ability, as previously demonstrated by others researchers (Greene et al, 1999;Ordonez et al, 2005;Turner et al 2007, Carrasquinho et al, 2010. Thus, it is obvious that any factor affecting tree/crown dimension will at the same time affect the cone/seed production.…”

Section: Discussionsupporting

confidence: 91%

“…In the same line, Ordonez et al (2005) found that large pine trees of Pinus nigra Arnold grown in Spain produced more cones than small trees and that the cone production varied with tree location. In a later study conducted by Turner et al (2007) with Pinus contorta, a complementary result was found, showing a strong positive relationship between mean tree size (stem diameter) and the average number of cones per tree. In other studies the fructification of coniferous tree species has been explained by the complexity of the interaction between the temporal and the spatial variation of the individual tree size characteristics (Ayari et al, 2010;Krannitz and Duralia, 2004;Menccucini et al, 1995).…”

Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 73%

“…Tapias et al (2001) showed that the number of cones tended to increase with age, as was observed in our results (Figure 2). Numerous authors showed proportional correlations between cone and seed production of pine with its DBH and height (Moya et al, 2008;Messaoud et al, 2007;Turner et al, 2007;Oliva and Colinas, 2007). Croker et al (1975) demonstrated that a tree with large crowns growing in open stands was the best cone producer.…”

Section: Discussionmentioning

confidence: 99%

“…In other studies the fructification of coniferous tree species has been explained by the complexity of the interaction between the temporal and the spatial variation of the individual tree size characteristics (Ayari et al, 2010;Krannitz and Duralia, 2004;Menccucini et al, 1995). It has also been found that there exists a correlation between pine seed cone production and the climatic factors expressed through the geographic coordinates such as longitude, altitude and latitude (Harfouch et al, 2003;Nasri et al, 2004;Turner et al, 2007;Messaoud et al, 2007;Ayari et al, 2011a).…”

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: Discussionsupporting

confidence: 91%

Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Fructification Of Aleppo Pine Forests In North Africamentioning

confidence: 99%

See 2 more Smart Citations

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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“…However, in the face of well-documented variation in the fecundity of single parent trees (e.g. Greenberg 2000;Turner et al 2007), such a belief may be quite misleading. Given small dispersal distances and a rapidly decreasing probability of seed fall with increasing distance from the parent, variation in ground seed density may be additionally enhanced by heterogeneity in local stand density, as for example in multi-layered forests or stands regenerated by an irregular shelterwood method.…”

Section: Introductionmentioning

confidence: 99%

Ground seed density patterns under conditions of strongly overlapping seed shadows in Abies alba Mill. stands

Paluch¹

2011

Eur J Forest Res

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In three subsequent years, seeds were collected from 66 to 75 seed traps in three Abies alba stands that differed in vertical structure and the number of potentially reproducing trees. The objective was to compare empirical patterns of seed density with a random (Poisson) model, which assumes that seed density would be the same in every location, and a binomial negative model that is appropriate for over-dispersed data. The seed density patterns were tested for spatio-temporal independence. The effect of some dispersal variables (number of mother trees and seed fall seasons, dispersal distance, fecundity rate) on seed density pattern was studied in a simple simulation experiment. Several local stand density measures (stem density, basal area, distance-weighted indices, canopy openness) were also tested for their ability to predict local seed density. The Poisson model was rejected in all the stands studied, and a much better fit achieved using the binomial negative model. The simulation study revealed that random seed distribution may occur only at considerable dispersal distances, concave seed shadows, and at very low fecundity rates. The seed density patterns identified exhibited both spatial and temporal correlation, which can probably be linked to the arrangement of mother trees and variation in their seed output. To a minor degree, this seed density pattern also correlated with local stand density.

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Factors limiting the potential range expansion of lodgepole pine in Interior Alaska

Walker,

Hart,

Hansen

et al. 2024

Ecological Applications

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Understanding the factors influencing species range limits is increasingly crucial in anticipating migrations due to human‐caused climate change. In the boreal biome, ongoing climate change and the associated increases in the rate, size, and severity of disturbances may alter the distributions of boreal tree species. Notably, Interior Alaska lacks native pine, a biogeographical anomaly that carries implications for ecosystem structure and function. The current range of lodgepole pine (Pinus contorta var. latifolia) in the adjacent Yukon Territory may expand into Interior Alaska, particularly with human assistance. Evaluating the potential for pine expansion in Alaska requires testing constraints on range limits such as dispersal limitations, environmental tolerance limits, and positive or negative biotic interactions. In this study, we used field experiments with pine seeds and transplanted seedlings, complemented by model simulations, to assess the abiotic and biotic factors influencing lodgepole pine seedling establishment and growth after fire in Interior Alaska. We found that pine could successfully recruit, survive, grow, and reproduce across our broadly distributed network of experimental sites. Our results show that both mammalian herbivory and competition from native tree species are unlikely to constrain pine growth and that environmental conditions commonly found in Interior Alaska fall well within the tolerance limits for pine. If dispersal constraints are released, lodgepole pine could have a geographically expansive range in Alaska, and once established, its growth is sufficient to support pine‐dominated stands. Given the impacts of lodgepole pine on ecosystem processes such as increases in timber production, carbon sequestration, landscape flammability, and reduced forage quality, natural or human‐assisted migration of this species is likely to substantially alter responses of Alaskan forest ecosystems to climate change.

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Cone production in young post-fire Pinus contorta stands in Greater Yellowstone (USA)

Cited by 38 publications

References 49 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

Ground seed density patterns under conditions of strongly overlapping seed shadows in Abies alba Mill. stands

Factors limiting the potential range expansion of lodgepole pine in Interior Alaska

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