tailieunhanh - Báo cáo lâm nghiệp: "Survival and acclimatation of Populus nigra to drier conditions after damming of an alpine river, southeast France"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Survival and acclimatation of Populus nigra to drier conditions after damming of an alpine river, southeast France" | Ann. For. Sci. 63 2006 377-385 INRA EDP Sciences 2006 DOI forest 2006018 377 Original article Survival and acclimatation of Populus nigra to drier conditions after damming of an alpine river southeast France Luc LAMBSa Mathieu LOUBIATa Jacky GlRELb Jérôme TlSSIERb Jean-Paul PELTIERb Gérard MARIGOb a Laboratoire Dynamique et Biodiversité-CNRS FR Écologie 29 rue Marvig 31055 Toulouse Cedex 05 France b Laboratoire d Écologie Alpine UMR 5553 Université Joseph Fourier BP 53 38041 Grenoble Cedex 9 France Received 23 June 2005 accepted 12 October 2005 Abstract - Poplars occur in riparian areas where the water table depth generally varies with the elevation of the adjacent river. Changes in stream flow caused by diversion projects can affect the riparian community this may lower the water table below the rooting zone of some tree species and cause then to suffer from a water shortage. Obligate riparian trees require access to a permanent water supply and are usually intolerant to low water potentials being poorly adapted to water stress. In this paper the survival of black poplars Populus nigra downstream of a dam constructed in the 1960s on the Drac river at the foot of the French Alps is reported. The growth water consumption and water status of some of these trees are compared with those of other poplars located downstream and growing under wetter conditions. Although water consumption and development were quite different for both their method of water regulation seemed to be quite similar. Populus nigra dendrochronological studies sap flow drought tolerance Résumé - Survie et adaptation de Populus nigra à des conditions plus sèches suite à la construction d un barrage sur une rivière des Alpes dans le sud-est de la France. Les peupliers poussent le long des rivières où la profondeur de la nappe varie avec le niveau de la rivière adjacente. Les changements de débit suite aux modifications de l écoulement peuvent affecter les forêts riveraines ceci peut faire .