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Evidence of climate effects on the height-diameter relationships of tree species / Mathieu Fortin in Annals of Forest Science, vol 76 n° 1 (March 2019)  

Public [article]  inAnnals of Forest Science > vol 76 n° 1 (March 2019) Titre : Evidence of climate effects on the height-diameter relationships of tree species Type de document : Article/Communication Auteurs : Mathieu Fortin, Auteur ; Rosalinde van Couwenberghe, Auteur ; Vincent Perez, Auteur Année de publication : 2019 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] allométrie [Termes IGN] changement climatique [Termes IGN] diamètre à hauteur de poitrine [Termes IGN] diamètre des arbres [Termes IGN] France (végétation) [Termes IGN] gestion forestière [Termes IGN] hauteur des arbres [Termes IGN] modèle de mélange multilinéaire [Termes IGN] précipitation [Termes IGN] température [Termes IGN] variable régionalisée [Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Key message : The mean temperature from March to September affects the height-diameter relationship of many tree species in France. For most of these species, the temperature effect is nonlinear, which makes the identification of an optimal temperature possible. Increases in mean temperature could impact the volume supply of commercial species by the end of the twenty-first century. Context : Height-diameter (HD) relationships are central in forestry since they are essential to estimate tree volume and biomass. Since the late 1960s, efforts have been made to generalize models of HD relationships through the inclusion of plot- and tree-level explanatory variables. In some recent studies, climate variables such as mean annual temperature and precipitation have been found to have a significant effect on HD allometry. However, in these studies, the effects were all considered to be linear or almost linear, which supposes that there is no optimal temperature and no optimal precipitation. Aims : In this study, we tested the hypothesis that an optimum effect of temperature and precipitation exists on tree heights. Methods : We fitted generalized models of HD relationships to 44 tree species distributed across France. To make sure that the climate variables would not hide some differences in terms of the local environment, the models included explanatory variables accounting for competition, tree social status and other plot-level factors such as slope inclination and the occurrence of harvesting in the last five years. Results : It turned out that the temperature effect was significant for 33 out of 44 species and an optimum was found in 26 cases. The precipitation effect was linear and was found to be significant for only seven species. Although the two climate variables did not contribute as much as the competition and the social status indices to the model fit, they were still important contributors. Under the representative concentration pathway (RCP) 2.6 and the assumptions of constant form factors and forest conditions in terms of competition and social statuses, it is expected that approximately two thirds of the species with climate-sensitive HD relationships will generally be shorter. This would induce a decrease in volume ranging from 1 to 5% for most of these species. Conclusion : Forest practitioners should be aware that the volume supply of some commercial species could decrease by the end of the twenty-first century. However, these losses could be partly compensated for by changes in the form factors and the species distributions. Numéro de notice : A2019-045 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s13595-018-0784-9 Date de publication en ligne : 19/12/2018 En ligne : https://doi.org/10.1007/s13595-018-0784-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92051 [article]

Abundance response of western European forest species along canopy openness and soil pH gradients / Rosalinde van Couwenberghe in Forest ecology and management, vol 262 n° 8 ([15/10/2011])  

Public [article]  inForest ecology and management > vol 262 n° 8 [15/10/2011] . - pp 1483 - 1490 Titre : Abundance response of western European forest species along canopy openness and soil pH gradients Type de document : Article/Communication Auteurs : Rosalinde van Couwenberghe, Auteur ; Catherine Collet, Auteur ; Eric Lacombe, Auteur ; Jean-Claude Gégout, Auteur Année de publication : 2011 Article en page(s) : pp 1483 - 1490 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] base de données naturalistes [Termes IGN] composition floristique [Termes IGN] flore locale [Termes IGN] forêt tempérée [Termes IGN] inventaire de la végétation [Termes IGN] régénération (sylviculture) [Termes IGN] relations plante - sol [Vedettes matières IGN] Foresterie Résumé : (auteur) In order to better understand the structure and composition of forest plant communities, we aimed to predict the abundance of understory herbaceous species locally at the stand level and according to different environments. For this, we seeked to model species distributions of abundance at a regional scale in relationship with the local stand structure (canopy openness) and regional soil resources (soil pH). Floristic inventories, performed in different light and soil conditions located in 1202 records of north eastern France, were used to analyze the combined effect of canopy openness and soil pH on the abundance of 12 common western European forest species: Anemone nemorosa, Deschampsia flexuosa, Festuca altissima, Hedera helix, Lamium galeobdolon, Lonicera periclymenum, Molinia caerulea, Oxalis acetosella, Pteridium aquilinum, Rubus fruticosus, Rubus idaeus, and Vaccinium myrtillus. Ordinal regression models relating species abundance responses to their environment were developed. For most species (eight out of 12), distribution was significantly affected by canopy openness and soil pH. Differences among low-abundance (i.e. cover 25%) responses were noted for 11 species along the canopy openness gradient and four species along the pH gradient. The present study quantifies optimal light and soil nutrient requirements for high-abundance responses and quantifies light and soil nutrients tolerance conditions for low-abundance responses. The combination of both factors highlights the pre-eminence of pH conditions occurrence and canopy openness for species abundance. The models developed by this study may be used to define canopy openness thresholds in function of soil characteristics to control the development of species during forest regeneration. The species-specific reactions on local canopy openness along a regional soil gradient illustrate the need for a species-specific management approach. Numéro de notice : A2011-564 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.foreco.2011.06.049 En ligne : https://doi.org/10.1016/j.foreco.2011.06.049 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76393 [article]