tailieunhanh - Báo cáo toán học: "Structure and fractal dimensions of root systems of four co-occurring fruit tree species from Botswana"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Structure and fractal dimensions of root systems of four co-occurring fruit tree species from Botswana. | 463 Ann. For. Sci. 57 2000 463-475 INRA EDP Sciences Original article Structure and fractal dimensions of root systems of four co-occurring fruit tree species from Botswana Armin L. Oppelt 1 Winfried Kurthb Helge Dzierzonb Georg Jentschkec and Douglas L. Godboldc a Georg-August-Universitat Gottingen Institut fur Forstbotanik Busgenweg 2 D-37077 Gottingen Germany b Georg-August-Universitat Gottingen Institut fur Forstliche Biometrie und Informatik Busgenweg 4 D-37077 Gottingen Germany c School of Agriculture and Forest Science University of Wales Bangor Gwynedd LL57 2UW UK Received 1 February 1999 accepted 29 October 1999 Abstract - Coarse root systems of four different fruit tree species from southern Africa were completely excavated and semi-auto-matically digitized. Spatial distributions of root length were determined from the digitally-reconstructed branching systems. Furthermore the fractal characteristic of the coarse root systems was shown by determining the box-counting dimensions. These quantitative methods revealed architectural differences between the species probably due to different ecophysiological strategies. For fine root samples which were taken before digging out the whole systems fractal analysis of the planar projections showed no significant inter-species differences. Methodologically the study underlines the usefulness of digital 3-D reconstruction in root research. root digital reconstruction fractal architectural analysis coarse root Résumé - Structures et dimensions fractales des systèmes racinaires provenant de quatre espèces d arbres fruitiers de Botswana. Des systèmes de grosses racines provenant de quatre espèces differentes d arbres fruitiers d Afrique du Sud ont été com-plètement déterrés et digitalises semi-automatiquement. Les distributions spatiales des longueurs de racines ont été calculées à partir des maquettes informatiques reconstituées. En outre le caractère fractal des systèmes de grosses racines a été prouvé par une .