Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Influence of environmental conditions on radial patterns of sap flux density of a 70-year Fagus crenata trees in the Naeba Mountains, Japan" | Ann. For. Sci. 62 2005 289-296 INRA EDP Sciences 2005 DOI forest 2005023 289 Original article Influence of environmental conditions on radial patterns of sap flux density of a 70-year Fagus crenata trees in the Naeba Mountains Japan Mitsumasa KUBOTAa John TENHUNENb Reiner Zimmermann0 Markus ScHMiDTb Yoshitaka KAKUBARia a Institute of Silviculture of Forest Resources Faculty of Agriculture University of Shizuoka Ohya 836 Shizuoka 422-8529 Japan b Department of Plant Ecology University of Bayreuth 95440 Bayreuth Germany c Max Planck Institute for Biogeochemistry PO Box 100164 07743 Jena Germany Received 27 May 2004 accepted 18 October 2004 Abstract - Sap flux density SFD was measured continuously during 1999 with the heat dissipation method in natural Fagus crenata Blume Japanese beech forests growing at 900 m on the northern slope of the Kagura Peak of the Naeba Mountains near the Sea of Japan. Radial variations in xylem daily SFD SFDday on three trees were investigated during the growing season. The radial pattern of SFDday that reached a maximum just behind of the cambium layer and then decreased exponentially was described by applying the Weibull function based on sensor measurements at 20 mm intervals. SFDday ratio of 20-40 mm depth the value of 0-20 mm depth was 100 increased by 10-32 because of soil drying. The peak value of the Weibull function shifted to 2-10 interior by those changes in the relative xylem depth. The variation of the radial pattern of SFDday under different environmental conditions was expressible as the shift of the peak position of the Weibull function. diffuse-porous Granier sensor soil moisture drought Weibull function Résumé - Influences des conditions environnementales sur les patrons radiaux de densités de flux de sève de Fagus crenata âgés de 70 ans dans les montagnes de Naeba au Japon. La densité de flux de sève SFD a été mesurée en continu pendant l annee 1999 avec la méthode de dissipation de chaleur dans une forêt .
