TAILIEUCHUNG - Báo cáo lâm nghiệp: "Excess nitrogen affects the frost sensitivity of the inner bark of Norway spruce"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Excess nitrogen affects the frost sensitivity of the inner bark of Norway spruce. | Ann. For. Sci. 61 2004 293-298 INRA EDP Sciences 2004 DOI forest 2004022 293 Original article Excess nitrogen affects the frost sensitivity of the inner bark of Norway spruce Anna Maria Jonsson Ulrika Rosengren Bengt Nihlgảrd Department of Ecology Plant Ecology and Systematics Lund University Ecology Building 223 62 Lund Sweden Received 15 February 2002 accepted 16 June 2003 Abstract - The sensitivity to frost in the living inner bark of trees have been hypothesised to be influenced by acid rain and N deposition through changes in nutrient balance and carbon metabolism. At the Skogaby experimental site situated in southern Sweden Norway spruce in control plots plots fertilized with ammonium sulphate and plots fertilized with mineral nutrients except N were compared in this respect. Frost sensitivity was measured by electrolytic leakage and expressed as an index of injury. The results showed increased sensitivity to frost in the bark of trees treated with continuous applications of ammonium sulphate for 11 years. This was probably not only a direct effect of high nitrogen availability but also caused by insufficient levels of other nutrients due to the rapid growth and changes in soil chemistry induced by the addition of ammonium sulphate. Mainly Mg and K seemed to be of importance for retaining a good frost resistance supporting the hypothesis that nutrient imbalances increases the risk for development of frost related bark lesions in southern Sweden. carbohydrates index of injury nutrient status Picea abies Skogaby stem damage Résumé - Effets d un excès d azote sur la sensibilité au froid de l écorce interne de l Epicéa. On a émis l hypothese selon laquelle la sensibilité au froid de la partie vivante interne de l écorce des arbres serait influencée par les pluies acides et les dégâts azotés par suite de changements de l équilibre d azote et du métabolisme du carbone. A la station expérimentale de Skogaby située en Suède méridionale on a comparé le .

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