A new bioclimatic model calibrated with vegetation for Mediterranean forest areas

Vennetier, M.; Ripert, C.; Maillé, E.; Blanc, Laurence; Torre, F. Jason; Roche, Philip; Tatoni, Thierry; Brun, Jean‐Jacques

doi:10.1051/forest:2008050

Cited by 17 publications

(16 citation statements)

References 28 publications

(22 reference statements)

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“…Moreover, the two sampling approach methodologies were confirmed as easier and cheaper estimators for natural Aleppo pine forests in southern Mediterranean Basin which have been described as more vigorous in growth and fructification than northern or eastern populations (Climent et al, 2008). Furthermore, Vennetier et al (2008) proved that P. halepensis was well adapted to the studied climatic zones and the obtained signif icant differences were supporting studies carried out in Tunisia (Khouja et al, 2000), Algeria (Harfouche et al, 2003;Bentouati and Bariteau, 2005) and Morocco (Belghazi et al 2000). Finally, the complexity of climatic influences on pine tree density resides in the structural and spatial distribution of pine trees (Vilà et al, 2003;Condés and Sterba 2008).…”

Section: Discussionmentioning

confidence: 90%

Alternative sampling methods to estimate structure

Ayari

Moya²,

Rejeb

et al. 2011

For. syst.

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Aleppo pine had a large forest cover in North Africa and along the Mediterranean basin which management is not fully developed and new forest tools are required. In this research, the forest structure, epidometric characteristics and allometric relationships were studied in 79 plots covering four bioclimatic zones from natural even aged forests of Aleppo pine located between eastern Algeria to the western coastal part of Tunisia. To characterize the forest structure three sampling methods were carried out: classical inventories (recording all pine trees), and two simplified approach using one average size or five dominant pine tree per plot. Annual growth increment and cone production were only calculated for the average size tree. Furthermore, the analysis of variance showed non-significant differences recorded between bioclimatic zones in trunk or crown diameter using the two simplified approach. Moreover, a significant decrease from wetter to drier areas in total height, crown height, cone seed production was observed only for average size tree method. However, the analysis of covariance showed significant differences between both approaches in total height, trunk diameter and crown coverage which were largely influenced by the pine tree density. In future investigations, we confirmed previous research that the dominant tree is a good sampling method to examine the site fertility, whereas the average size tree constitutes a valuable approach to study the population growth and reproduction.Key words: Pinus halepensis Mill.; bioclimatic zones; forest structure; sampling approach; increment; reproductive characteristics. ResumenMétodos alternativos de muestreo para estimar la estructura y caracteres reproductivos de bosques de pino carrasco en Túnez El pino carrasco muestra una gran cobertura forestal, tanto en el norte de África como en toda la Cuenca Mediterránea, cuyo manejo no está totalmente desarrollado lo que requiere nuevas herramientas de manejo. En esta investigación, se estudiaron la estructura forestal, las características epidométricas y las relaciones alométricas de 79 parcelas distribuidas a lo largo de cuatro zonas bioclimáticas en bosques regulares de pino carrasco situados entre el este de Argelia y la costa este de Túnez. Para caracterizar la estructura forestal se aplicaron tres métodos de muestreo: inventario clásico (midiendo todos los pies) y dos propuestas más sencillas, usando un árbol medio o cinco pies dominantes por parcela. El análisis de varianza no mostraba diferencias significativas de las mediciones de diámetro de tronco y de copa realizadas entre las distintas zonas bioclimáticas usando ambos métodos. Por otra parte, se observó una disminución significativa de las zonas más húmedas a las más secas en altura toral, altura de copa y producción de semillas fue observada aplicando el método de árbol medio. Además, el análisis de covarianzas mostraba diferencias significativas, usando ambas metodologías, en los valores medios de altura total, diámetro de tronco y cobertura de...

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Section: Discussionmentioning

confidence: 90%

Alternative sampling methods to estimate structure

Ayari

Moya²,

Rejeb

et al. 2011

For. syst.

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“…The Font-Blanche forest is dominated by irregular stands of 12-14 m-high Aleppo pines aged between 35 and 115 years (dominant class = 58 years), mixed with a 6 mhigh Quercus ilex L. coppice. The understory is a dense thicket, 1-3 m in height, of Quercus coccifera L. and Phyllirea latifolia L. According to the bioclimatic index (BI) designed by Vennetier et al (2008), site conditions and water balance at Font-Blanche (BI = 8) are very close to the mean value for the French Mediterranean area (BI span = -80 to ?80, mean = 0). Accordingly, the site index for Aleppo pine calculated from tree height/age ratio is exactly in the middle of the average fertility class for this species in France .…”

Section: Study Sitementioning

confidence: 92%

Pinus halepensis Mill. crown development and fruiting declined with repeated drought in Mediterranean France

et al. 2011

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Les objectifs de ce projet étaient de décrire et quantifier les processus de croissance primaire aérienne du pin d'Alep et d'évaluer leur relation avec le climat. La croissance primaire (allongement des branches, taux de ramification, polycyclisme, nombre et atille d'aiguilles, fructification) c'est à dire le développement architectural du houppier et la fructification, ont été reconstitués pour les 16 dernières années en région méditerranéenne française. De 1998 à 2007, le climat de la zone d'étude a été beaucoup plus chaud et sec que la normale. Toutes les variables relatives au développement du houppier et la fructification, de même que la croissance en diamètre, ont décliné significativement après la canicule de 2003 et durant les années de sécheresses répétées qui ont suivi de 2004 à 2007. Une reprise partielle a été observée de 2008 à 2010 sur les branches vigoureuses, tandis que les branches faibles montraient moins d'amélioration. Le développement limité du houppier durant les années défavorables réduit significativement le potentiel photosynthétique des arbres durant plusieurs années suivantes et contribue à une convalescence plus longue que prévue ou à la mort différée des arbres. / The objectives of this study were to describe and quantify Aleppo pine aerial primary growth processes and to assess their relationships with climate. Primary growth (branch length growth, branching rate, polycyclism, needle number and size, fruiting), i.e. crown development and reproduction, was reconstructed for the last 16 years in Mediterranean France. From 1998 to 2007, climate has been far hotter and drier than normal in South-eastern France. All variables related to crown development and fruiting, as well as radial growth, significantly declined after 2003 heat-wave and during repeated droughts from 2004 to 2007. A partial recovery of most parameters occurred from 2008 to 2010 on vigorous branches while frail branches showed less improvement. The limited crown development during unfavourable years may significantly hold back tree potential photosynthetic biomass for several following years and contribute to a slower than expected recovery of tree growth or to delayed die-back

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“…The three Sainte-Baume plots are situated on a limestone substrate. They were chosen as representative of three levels of site quality according to the site index developed for the French Mediterranean area by Vennetier et al (2008), which proved to be closely related to forest productivity and water availability for plants. This index is computed from six variables describing soil (depth, % of coarse fragments and rock, water holding capacity of fine earth), topography (at local and landscape scale), and geology (mother rock outcrops).…”

Section: Study Sitesmentioning

confidence: 99%

Response of Pinus sylvestris L. to recent climatic events in the French Mediterranean region

Thabeet

Vennetier

Gadbin-Henry³

et al. 2009

Trees

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Exceptional climatic events from 2003 to 2005 (scorching heat and drought) affected the whole of the vegetation in the French Mediterranean region and in particular the Scots pine (Pinus sylvestris L.), one of the most important forest tree species in this area. To understand its response to these extreme conditions, we investigated its radial growth, branch length growth, architectural development and reproduction for the period 1995-2005, and linked these variables to climatic parameters. We used four plots situated in southeastern France and presenting different levels of site quality and potential forest productivity. The results show that: (1) the climatic episode 2003-2005 was highly detrimental to the growth (bole and branches), crown development, and cone production but favored the production of male flowers; (2) these variables depend on climatic factors of both the current and previous years; (3) the 2003 scorching heat impact was strong but was mainly apparent from 2004; it was part of a 6-year-long unfavorable cycle beginning in 2000, characterized by high minimum and maximum temperatures and very dry springs; (4) in spite of a significant effect of site quality, the Scots pine's response to extreme climatic conditions was homogeneous in the French Mediterranean area; and (5) the stress induced by poor site conditions generally resulted in the same consequences for tree growth, architecture, and reproduction as in unfavorable climatic conditions.

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A new bioclimatic model calibrated with vegetation for Mediterranean forest areas

Cited by 17 publications

References 28 publications

Alternative sampling methods to estimate structure

Alternative sampling methods to estimate structure

Pinus halepensis Mill. crown development and fruiting declined with repeated drought in Mediterranean France

Response of Pinus sylvestris L. to recent climatic events in the French Mediterranean region

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