Effects of silvicultural treatments and seasonal patterns on foliar nutrients in young post-fire Pinus halepensis forest stands

López‐Serrano, Francisco R.; Heras, Jorge de las; González-Ochoa, Ana; Morote, Francisco Antonio García

doi:10.1016/j.foreco.2005.02.042

Cited by 48 publications

(48 citation statements)

References 28 publications

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“…This result was not confirmed in the present study. This difference was probably due to the relatively low density of our pine stands (< 1 600 stems.ha −1 versus 5 000-46 000 stems.ha −1 for Lopez-Serrano et al, 2005) which, in our case, resulted in high light transmittance. Keay et al (1968) did not observe a vertical gradient in nutrient concentrations in needles in a 13 year-old Pinus pinaster stand comprising 1950 stems.ha −1 .…”

Section: Distribution Within Each Tissuementioning

confidence: 66%

Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments

Augusto¹,

Meredieu

Bert

et al. 2008

Ann. For. Sci.

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, et al.. Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments. Annals of Forest Science, Springer Verlag/EDP Sciences, 2008, 65 (8), pp.1. Ann. For. Sci. 65 (2008) Abstract• The objective of this study was to explore the distribution of major nutrients (N, P, K, Ca and Mg) in the aboveground compartments of an intensively managed tree species (Pinus pinaster Ait.). A total of 53 trees were cut down in even-aged stands respectively 8, 16, 26, 32 and 40 years old. The nutrient concentrations of the aboveground compartments were analysed.• Nutrient concentrations of foliage did not vary with any of the variables used, except needle age. Nutrient concentrations of living branches, stem bark, stem sapwood, stem heartwood, stemwood and stem decreased with increasing branch diameter, bark thickness, sapwood thickness and heartwood thickness, respectively. Beyond a certain value of the predictive variable (stem diameter ≈ 15 cm; branch diameter ≈ 2.5 cm), the concentration of all the nutrients stabilised.• A 50 year-old pine stand was used to obtain a validation dataset for nitrogen concentration. For this nutrient, the regression relationships gave satisfactory estimates for most compartments (mean error = 12-25%) and particularly for the stem.• A procedure is proposed to estimate the nutrient exports associated with harvests of Pinus pinaster biomass. • L'objectif de cette étude est d'explorer la distribution des éléments majeurs (N, P, K, Ca, Mg) dans les compartiments aériens d'une essence gérée de manière intensive. Au total, 53 pins maritimes (Pinus pinaster Ait.) ont été abattus parmi des peuplements équiennes de 8, 16, 26, 32 et 40 ans. Mots-clés• Les concentrations en nutriments du feuillage ne varient pas pour une classe d'âge d'aiguilles donnée. Les concentrations des branches vivantes, de l'écorce, de l'aubier et du duramen décroissent lorsque le diamètre ou l'épaisseur du compartiment considéré augmente. La concentration de l'ensemble des nutriments devient constante lorsque la variable prédictive (diamètre ou épaisseur) atteint une valeur plateau.• Un jeu de données de validation pour les concentrations en azote, provenant d'un peuplement équienne de pins de 50 ans, permet de confirmer les performances satisfaisantes des modèles construits (erreur moyenne = 12-25 %) et en particulier pour le tronc.• Une procédure d'estimation des exportations de nutriments associées aux récoltes de biomasse de Pinus pinaster est présentée.

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Section: Distribution Within Each Tissuementioning

confidence: 66%

Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments

Augusto¹,

Meredieu

Bert

et al. 2008

Ann. For. Sci.

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“…lateral and principal twig growth) and leaf production are far more important than secondary growth (i.e. radial growth) (Lopez-Serrano et al 2005). Our goals in this study were (1) to describe polycyclism periodicity and frequency on Aleppo pine in the Mediterranean region and (2) to assess interrelationships between polycyclism frequency, twig status, twig growth and climate.…”

Section: Introductionmentioning

confidence: 99%

Polycyclism, a fundamental tree growth process, decline with recent climate change: the example of Pinus halepensis Mill. in Mediterranean France

Girard

Vennetier

Ouarmim

et al. 2010

Trees

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Polycyclism, the ability for a plant to produce several flushes in the same growing season, is a key process of plant development. Polycyclism frequency is likely to change with the anticipated climate trend, expected to impact plant growth over the next century. However, polycyclism processes are not well described in the literature, and an important lack of knowledge prevents any possible prediction for the twenty-first century. Aleppo pine is a good model to study polycyclism: it is known to produce up to four annual flushes in one growing season. In this study, we used architectural analysis to describe and reconstruct polycyclism processes, periodicity and frequency on Aleppo pine in a Mediterranean site for the last 15 years. We also assessed relationships between polycyclism frequency and climate. Since 1995, climate was far hotter and drier than normal in South-eastern France: polycyclism was significantly reduced, particularly after 2003 heat-wave, which delayed effect remains till 2008, exacerbated by repeated droughts. Morphologically, polycyclism is primarily influenced by twig vigour, status (principal/secondary and strong axes) and position (low, middle or top crown). Climatically, it depends on summer temperatures of the current and preceding year, rainfall of the first half of preceding year and winter rainfall. Previous year abundant rainfall combined with colder temperatures and high rainfall in spring or at the end of summer of the current year increase tricyclism frequency. Polycyclism is likely to decrease significantly in the twenty-first century due to a hotter and drier climate.

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“…This theory was confirmed by Makineci (2001) in a study carried out on Turkish oak coppices where total nitrogen amounts increased in top soil horizons after thinning. After thinning of Aleppo pine needles in South-Eastern Spain (Lopéz-Serrano et al, 2005) and old Ponderosa pine in Arizona (Wallin et al, 2004) it was found that foliar nitrogen concentration was higher where thinning had occurred. Improved soil water availability due to thinning was observed a few years after Douglas-fir thinning by Aussenac and Granier (1988) and by Stogsill et al (1992) in loblolly pine plantations.…”

Section: Discussionmentioning

confidence: 99%

Tree-ring Δ13C reveals the impact of past forest management on water-use efficiency in a Mediterranean oak coppice in Tuscany (Italy)

Matteo¹,

Angelis²,

Brugnoli³

et al. 2010

Ann. For. Sci.

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Abstract• The effects of thinning and heavy stand density reduction was investigated in Turkey oak (Quercus cerris L.) forests of central Italy, to evaluate the physiological responses and the growth status of trees that survived a past coppice cut and thinning to convert the stand to high-forest.• The working hypothesis was that a strong decrease in stand density would cause a decreasing in canopy-intrinsic water-use efficiency (measured as the ratio of CO 2 assimilation to stomatal conductance, A/g), thus an increase in tree-ring carbon isotopic discrimination (Δ 13 C).• The tree-ring Δ 13 C of the remaining trees ("survivors") was found to have significantly (P < 0.05) raised between year two and year seven since the coppice stand was thinned (high-forest conversion thinnings). This effect was mostly caused by a large decrease in tree-rings Δ 13 C at control site which was characterized by high density and competition by trees. An increase in survivors tree-rings Δ 13 C probably indicates an improved water availability, possibly induced by a decrease in competition and in stand density or a decrease in the precipitation intercepted by the canopy (i.e., a stronger increase in g over A since a decrease in A is highly unlikely). A change in foliar nitrogen, foliar Δ 13 C and content in chlorophylls was also recorded seven years after thinning.• Thinnings carried out to convert old abandoned coppices into high-forest stands induce short-term stimulation of Turkey oak growth by increasing light and water availability. We were able to make a detailed reconstruction of the impact of past silvicultural treatment on the stand using a tree-ring wood Δ 13 C time-series. Mots-clés :Quercus cerris / isotopes du carbone / cernes / accroissement de la surface terrière / traitements sylvicoles / taillis abandonnés Résumé -Le Δ 13 C des cernes révèle l'impact de la gestion forestière passée sur l'efficience d'utilisation de l'eau dans un taillis de chêne méditerranéen en Toscane (Italie).• Les effets de l'éclaircie et de la réduction importante de la densité du peuplement ont été étudiés dans des forêts de chêne de Turquie (Quercus cerris L.) de l'Italie centrale, afin d'évaluer les réac-tions physiologiques et l'état de croissance des arbres qui ont survécu à une coupe de taillis et à une éclaircie pour la conversion du peuplement en futaie.• L'hypothèse de travail était qu'une forte diminution de la densité du peuplement entraînerait une baisse de l'efficience intrinsèque d'utilisation de l'eau de la canopée (mesurée par le rapport de l'assimilation de CO 2 à la conductance stomatique, A/g), donc par une augmentation de la discrimination isotopique du carbone dans les cernes (Δ 13 C).• Les Δ 13 C des cernes des arbres restants (« survivants ») ont été trouvés significativement (P < 0, 05) augmentés entre deux ans et sept ans après que le peuplement de taillis a été éclairci (conversion en futaie). Cet effet a été principalement causé par une importante diminution du Δ 13 C des cernes dans le peuplement témoin qui se caracté...

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Effects of silvicultural treatments and seasonal patterns on foliar nutrients in young post-fire Pinus halepensis forest stands

Cited by 48 publications

References 28 publications

Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments

Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments

Polycyclism, a fundamental tree growth process, decline with recent climate change: the example of Pinus halepensis Mill. in Mediterranean France

Tree-ring Δ13C reveals the impact of past forest management on water-use efficiency in a Mediterranean oak coppice in Tuscany (Italy)

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