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Báo cáo lâm nghiệp: "Spatio-temporal pattern of bog pine (Pinus uncinata var. rotundata) at the interface with the Norway spruce (Picea abies) belt on the edge of a raised bog in the Jura Mountains, Switzerland"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Spatio-temporal pattern of bog pine (Pinus uncinata var. rotundata) at the interface with the Norway spruce (Picea abies) belt on the edge of a raised bog in the Jura Mountains, Switzerland. | Ann. For. Sci. 61 2004 309-318 INRA EDP Sciences 2004 DOI 10.1051 forest 2004024 309 Original article Spatio-temporal pattern of bog pine Pinus uncinata var. rotundata at the interface with the Norway spruce Picea abies belt on the edge of a raised bog in the Jura Mountains Switzerland Francois FRELÉCHOUXa b c Alexandre BUTTLERb d Fritz H. SCHWEiNGRUBERe Jean-Michel GOBATa a Laboratoire d Écologie végétale et de Phytosociologie Institut de Botanique de l Université de Neuchâtel rue Émile-Argand 11 2007 Neuchâtel Switzerland b WSL Antenne romande Swiss Federal Research Institute Case postale 96 1015 Lausanne Switzerland c Laboratoire d Écologie et Évolution Département de Biologie Pérolles Chemin du Musée 10 1700 Fribourg Switzerland d Laboratoire de Chrono-écologie UMR 6565 CNRS UFR des Sciences et Techniques 16 route de Gray Université de Franche-Comté 25030 Besanẹon France e WSL Swiss Federal Research Institute Zurcherstrasse 111 8903 Birmensdorf Switzerland Received 17 February 2003 accepted 24 April 2003 Abstract - In a bog site in way of paludification a pine stand is declining which presently is an infrequent phenomenon on the Swiss Jura scale. A transect was positioned in the bog from the external and driest part pine-spruce stand towards the central and wettest part pine stand . Water table tree structure tree age structure and pine radial growth were analysed with spatial and temporal references. The ground water level is very shallow and the hydrologic gradient is obvious during dry periods. Tree structure height and diameter is strongly linked to the hydrologic gradient. Two cohorts have invaded the bog with a 70-year-time period between them. The first one concerned the whole transect it started around 1840 and could be related to a clear cutting on the fringe of the bog. After a quick initial radial growth the pines reduced their radial growth abruptly 1870-1885 more quickly and strongly in the centre of the bog where an important mortality was .