TAILIEUCHUNG - Báo cáo khoa học: "Foliation of spruce in the Giant Mts. and its coherence with growth and climate over the last 100 years"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Foliation of spruce in the Giant Mts. and its coherence with growth and climate over the last 100 years. | 155 Ann. For. Sci. 58 2001 155-164 INRA EDP Sciences 2001 Original article Foliation of spruce in the Giant Mts. and its coherence with growth and climate over the last 100 years Constantin Sander and Dieter Eckstein Institute for Wood Biology University of Hamburg 21031 Hamburg Germany Received 3 January 2000 accepted 12 July 2000 Abstract - Five spruces Picea abies L. Karst. in the Giant Mts. Czech Republic were investigated to reconstruct variations in their foliation over the last 100 years and to establish possible coherences with growth and climate. Foliation was assessed by means of the needle traces in the main trunk. The annual average needle production of 355 needles per shoot correlated with the annual shoot length and was affected by the temperature prevailing in March and October of the previous year. A determination of needle production by the length of the vegetation period is discussed. The needle retention of the trees was needle sets on average but there were considerable long-term variations and maximum needle age even reached years. Needle shed was between and needle sets per year and no connection was revealed between needle shed and radial increment or shoot growth. Needle retention and annual needle shed were independent of climate. Norway spruce foliation growth needle traces climate Résumé - Les feuillages de sapins dans les Monts Kroknose et la relation entre croissance et climat au cours des 100 dernières années. Les variations du feuillage de cinq sapins Picea abies L. Karst. provenant des Monts Kroknose en République Tchèque ont été étudiées sur une période couvrant les 100 dernières années afin d établir une possible relation existant entre la croissance et le climat. Le feuillage a été évalué d après les traces laissées par les aiguilles dans le tronc principal. La production moyenne annuelle d aiguilles de 355 aiguilles par pousse qui est corrélée avec la longueur annuelle de pousse a été affectée par les températures

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