TAILIEUCHUNG - Báo cáo lâm nghiệp:"Succession from bog pine (Pinus uncinata var. rotundata) to Norway spruce (Picea abies) stands in relation to anthropic"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Succession from bog pine (Pinus uncinata var. rotundata) to Norway spruce (Picea abies) stands in relation to anthropic" | Ann. For. Sci. 60 2003 347-356 INRA EDP Sciences 2003 DOI forest 2003025 347 Original article Succession from bog pine Pinus uncinata var. rotundata to Norway spruce Picea abies stands in relation to anthropic factors in Les Saignolis bog Jura Mountains Switzerland Franẹois FRELÉCHOUXa b Alexandre BUTTLERb c Franẹois GiLLETa Jean-Michel GOBATa and Fritz H. SCHWEiNGRUBERd a Laboratoire d Écologie végétale et de Phytosociologie Institut de Botanique de l Université de Neuchâtel rue Emile-Argand 11 2007 Neuchâtel Switzerland b WSL Antenne romande Swiss Federal Research Institute Case postale 96 1015 Lausanne Switzerland c Laboratoire de Chrono-écologie UMR 6565 CNRS UFR des Sciences et Techniques 16 route de Gray Université de Franche-Comté 25030 Besanẹon France d WSL Swiss Federal Research Institute Zurcherstrasse 111 8903 Birmensdorf Switzerland Received 25 February 2002 accepted 23 May 2002 Abstract - In Jura bogs on deep and nutrient-poor peat the ecotone between bog pine forest and Norway spruce forest is sharp and in a few disturbed situations no succession pine forest-spruce forest occurs. The bog Les Saignolis lies at the top of an anticline on thin and oligotrophic peat. Several documents attest some anthropic disturbances clear cut and drainage . Beside these historical data and with the aim of reconstructing vegetation dynamics and tree growth we realised synusial phytosociological relevés and in a mixed pine-spruce stand we studied tree radial growth. Following the clear cut the bog pine the pubescent birch and the Norway spruce settled simultaneously. The birch disappeared rapidly. The present cohort of pine settled and grew rapidly and then declined because of the competition by spruce. Spruce settled progressively and increased its growth regularly except when pine settled and grew. Interspecific competition between pines and spruces and intraspecific competition between dominant and sub-dominant spruces were put into evidence by radial growth .

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