Geographical variation on cone and seed production of natural Pinus halepensis Mill. forests in Tunisia

Ayari, Abdelaziz; Moya, Daniel; Rejeb, Mohamed Néjib; Mansoura, A. Ben; Albouchi, Ali; Heras, Jorge de las; Fezzani, Tarek; Henchi, Belgacem

doi:10.1016/j.jaridenv.2011.01.001

Cited by 25 publications

(30 citation statements)

References 21 publications

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“…In our study, the sub-humid areas produced substantially heavier cones with better seed fills in comparison to the lower semiarid zones. Other previous studies showed that stand density also affects the cone production per tree, reducing the production due to the higher tree densities within the stand (Ayari et al, 2010;2011a), that is associated with an increased tree competition (Arista and Talavera, 1996;Karlsson and Orlander, 2002). In the present study, stand density affected negatively the crown dimension of the average tree, especially CrS and CrV.…”

Section: Discussionsupporting

confidence: 45%

“…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: 45%

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.

Self Cite

View full text Add to dashboard Cite

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“…Variation within and between species was also observed between the two years, and can be explained by the differences in climatic conditions, geographic variables, soil conditions, site quality, genetic factors and genotypes used (García, Zamora, Gómez, Jordano, & Hódar, 2000;Susko & Lovett-Doust, 2000;Ayari et al 2011;Podleśny & Podleśna, 2012). Legumes have a very high yielding dependency on weather conditions with temperature and drought primarily affecting critical stages of plant development such as flowering to pod set …”

Section: Seed Productionmentioning

confidence: 99%

“…thus altering the growth season, impeding seed maturation consequently affecting seed production (Thuzar, Puteh, Abdullah, Lassim, & Jusoff, 2010;Valtuéna, Ortega-Olivencia, Rodríguez-Riaño, & López, 2010;Ayari et al, 2011;Podleśny & Podleśna, 2012). Regeneration failure may be expected in years where climatic conditions favour species to produce more pods but initiate and fill less seeds, ultimately leading to species extinction in accordance with García et al (2000).…”

Section: Germination (%)mentioning

confidence: 99%

Natural Fecundity and Germination Characteristics of Selected Cyclopia (Honeybush) Species: Preliminary Findings

Motsa¹,

Bester²,

Slabbert³

et al. 2017

JAS

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Cyclopia Vent. (honeybush) is a South African herbal tea legume endemic to the Cape Floristic Region of South Africa. At present, knowledge of reproductive fitness (fecundity) between cultivated and undomesticated Cyclopia species is scant. Cultivated genotypes of C. genistoides (L.) R.Br. and C. subternata Vogel were evaluated for their potential to produce fruit and seeds in different localities spanning two years. Fecundity and germination were also determined from natural environment of each species and compared to cultivated species in order to determine the variation between species and between cultivated and non-cultivated species. Seeds collected were weighed to determined seed mass and evaluated for germination rate and cumulative germination per individual site. A fifth of flowers developing into a pod, averaged more initiated and filled seeds per pod in C. subternata than C. genistoides. Germination percentage was directly proportional to rate of germination in both species. Cyclopia subternata had a higher fecundity and germination than C. genistoides in both cultivated and natural environments. The study results assist in the further improvement of the genus through breeding new cultivars for seed with desired qualities for improving commercial characteristics; planning of seed orchards for seed production, selecting of best sites, assisting in choosing progenies for seed production and rehabilitation of degraded sites for the sustainable production of honeybush.

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“…If the cone collection time is delayed too long, most of the cones may shatter and distribute their seeds. Therefore, the best cone collection time depends on many factors, such as species (Johnson et al, 2003), bioclimatic conditions (Ayari et al, 2011), and geographic variables (Karaşahin et al, 2000). Temperature and the moisture content of seed during storage also significantly (P < 0.001) affects the germination of Nordmann fir (Karaşahin et al, 2001).…”

Section: Germination Variationmentioning

confidence: 99%

Variation in needle and cone characteristics and seed germination ability of Abies bornmuelleriana and Abies equi-trojani populations from Turkey

Kurt¹,

Frampton²,

Isik³

et al. 2016

Turk J Agric For

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Geographical variation on cone and seed production of natural Pinus halepensis Mill. forests in Tunisia

Cited by 25 publications

References 21 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

Natural Fecundity and Germination Characteristics of Selected Cyclopia (Honeybush) Species: Preliminary Findings

Variation in needle and cone characteristics and seed germination ability of Abies bornmuelleriana and Abies equi-trojani populations from Turkey

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