TAILIEUCHUNG - Báo cáo khoa học: "The growth of spruce (Picea abies (L) Karst) in the Krkonoše-(Giant) Mountains as indicated by ring width and wood density"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"The growth of spruce (Picea abies (L) Karst) in the Krkonoše-(Giant) Mountains as indicated by ring width and wood density. | Ann Sci For 1995 52 401 -410 Elsevier INRA 401 Original article The growth of spruce Picea abies L Karst in the Krkonose- Giant Mountains as indicated by ring width and wood density c Sander1 D Eckstein 1 J Kyncl 2 J Dobrý 2 11nstitute for Wood Biology University of Hamburg LeuschnerstraBe 91 D-21031 Hamburg Germany 2 Institute of Botany Czech Academy of Sciences CZ-252 43 Pruhonice Czech Republic Received 8 July 1994 accepted 23 November 1994 Summary The spruce forests near the upper tree line in the Krkonose Mountains Czech Republic are damaged by air pollution. Along an altitudinal transect 141 spruces have been investigated to find out whether pollution has affected cambial activity indicated by changes in tree-ring width maximum latewood density and a changing growth response to climate. Under severe pollution impact a decline in both tree-ring width and maximum density was apparent. Correlation and multiple regression analyses of growth and climate point to a reduced length of the growth period in the last 2 decades. A possible relation to pollution impact is discussed. Norway spruce tree ring latewood density I pollution climate Resume Croissance de répicéa commun Picea abies L Karst dans les monts Krkonose determination par la mesure de la largeur des cemes et de la densité du bois. Les peuplements d epicea common Picea abies L Karst situés à proximité de la limite altitudinale des arbres dans les monts Krkonose République tchèque sont affectes par la pollution atmosphérique. Un échantillon de 141 arbres a été sélectionné le long fun gradient altitudinal pour examiner I effet de la pollution sur I acti-vité cambiale par le biais des variations de la largeur des cemes de croissance de la densité maximale du bois final ainsi que de la réponse de ces 2 paramètres au climat. Les niveaux élevés de pollution sont associés à une baisse de la largeur des cernes de croissance ainsi que de la densité maximale. Des analyses de correlation et des regressions multiples

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