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Tree ring research on conifers in the Alps (France and Italy).Dendroecology, climatic studies nav = navigator.appName.substring(0,3); ver = navigator.appVersion.substring(0,1) function addFav() {if (nav == "Mic" && ver>= 4) {url_site="http://www.christian.rolland.free.fr"; titre_site = "Tree-rings and climate, dendroecology (www.christian.rolland.free.fr)"; document.write('Add this web site in your favorites links')} else{document.write('CTRL+D to add this web site to your favorites')}}  Tree ring research on conifers in the Alps Dendroecology, dendroclimatology and climatic studies  [ Home ] [ Publications ] [ Abstracts ] [ Wood samples ] [ European wood species ] [ Contact us ] [ Links ] [ List of trees ] Tree-ring research on conifers in the FrenchAlpsDuring last decades, many dendroecological and dendroclimatological studieshave been carried out by our research team on coniferous species. Our laboratory, the "Centre d'Ecologie Alpine" is located in Grenoble,France (Laboratoire Ecosystèmes Alpins).We investigated with dendroecological techniques several forests located in theFrench and Italian alpine mountains.Our work deals with tree growth, climatic change, dendroecology (such as insectimpact) and dendroclimatology.  A detailed list of our publications is available here, with abstracts for most articles in different languages see our publication list     Wood samplesThis web site also shows pictures of many woodspecies.       See the photographies of 25 different wood species from Europe (radial, and tangential cut) You can also see pictures of many wood samples of tropical tree species (from Africa, and Southern America) and from Northern America, Europe...  French alphabetical index ( to select the wood species by french names) acajou, aubépine, bouleau, charme, charme, chataignier, chêne, cyprès, épicéa, frêne, if, hêtre, mélèze, noyer, orme, padouk, palissandre, pin, platane, poirier, robinier, sapelli, sapin, sorbier, teck, tilleu, wengé... et bien d'autres. English, German and Scientific names (to chose a wood sample). afrormosia, apple tree, aspen, avodire, balsa , beech, birch, cedar , cocobolo, douglas, ebony, fir, hawthorn, hornbeam, juniper, larch, lime, mahogany, mansonia, mapple, oak, pear, pine, poplar, rosewood , sequoia, spruce, teck, tulip wood, walnut, whitebeam, yew, zebrano.... and so on. see the tree species list Studied speciesThe 6 main coniferous species (Table 1)growing in South Eastern French Alps have been investigated: Pinus uncinata Mill. ex Mirb. Mountain Pine Pin à crochets, Vercors  © Rolland Picea abies(L.) Karst. Norway Spruce Epicéa commun, Savoie  © Rolland Pinus sylvestrisL. Scotch Pine Pin sylvestre, Maurienne  © Rolland Abies albaMill. White Fir Sapin pectiné  Pinus cembraL. Stone Pine (Cembrian Pine) Pin cembro, Maurienne  © Rolland Larix deciduaMill. European Larch Mélèze d'Europe, Briançonnais  © Rolland Sampling areasMany sampled sites were compared in several alpine valleys, mainly located inthe south eastern French Alps: Trièves, Vercors,Chartreuse, Oisans,Belledonne, Tarentaise,Briançonnais, Queyras, and Maurienne, or in the FrenchPyrennes.Some other areas were also analysed in Italy: the Susa valley (Bardoneccia), and the Trentino & Alto-Adige (South Tirol)regionResearch Our main research subjects were: 1 Reconstruction of radial tree growth We used tree-ring width measurements to compare species, and to analyse radial tree growth in various ecological conditions. Thus, the tree ecological requirements were obtained for several species. 2 Tree ring and climate relationships The tree-ring and climate relationships of many species were investigated with classical dendroclimatological tools, such as the response functions, the correlation functions, the 'gleichlaufigkeit' method, and pointer years analysis. The densitometrical method (with X-rays) was also performed to find what climatic factors were significant during ring formation. 3 Impact of insects and pathogens on tree growth Growth reductions and tree dieback caused by some insect species were studied using ring-width analysis. The European larch is periodically infested by larch bud moth caterpillars (Zeiraphera diniana Gn., Lepidoptera: Tortricidae), every 8 - 9 years. Intense tree defoliation during spring lead to a photosynthesis decline, and hence to a reduced radial growth. Therefore, larch extreme narrow rings permited us to date larch bud moth past ourbreaks. Consequences on tree growth were also measured. The Norway spruce is infested by Dendroctonus micans Kug. (Coleoptera, Scolytidae) in the Ardèche region. The bark borer attacks lead to tree dieback and mortality. This phenomenon had also been studied with ring width measurements. Our research team Our research team Laboratory address Christian ROLLAND Véronique PETITCOLAS Carole DESPLANQUE Richard MICHALET Jeanne FLORENCE SCHUELLER Dr. Christian ROLLAND Laboratoire Ecosystèmes Alpins Centre d'Ecologie Alpine Université Joseph Fourier BP 53 X F - 38 041 GRENOBLE Cedex (France)   Contact us: Don't hesitate to contact us if you have some suggestions for improving this web site ! addFav();  Theses pages areinstalled on :   Please, give us your advice about these webpages. Statistiques XITI://  Return  addFav(); |
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