TAILIEUCHUNG - Báo cáo khoa học: "A comparison of five indirect methods for characterizing the light environment in a tropical fores"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: A comparison of five indirect methods for characterizing the light environment in a tropical forest. | Ann. For. Sci. 58 2001 877-891 INRA EDP Sciences 2001 877 Original article A comparison of five indirect methods for characterizing the light environment in a tropical forest Anne Fermenta Nicolas Picarda Sylvie Gourlet-Fleurya and Christopher Baralotob a Cirad-Forêt TA 10 B 34398 Montpellier Cedex 5 France b Department of Biology University of Michigan Ann Arbor MI 48109-1048 USA Received 23 August 2000 accepted 6 September 2001 Abstract -We compared five methods for measuring light availability in the tropical forest understorey the LAI-2000 PCA an empirical LAI-metre a densiometre photosensitive diazo paper metres and hemispherical photographs. Measurements were made along three 250 m transects and adjacent to 95 seedlings on four logged or virgin plots of a French Guianese forest. Correlation analysis showed that more mobile and less expensive methods such as the LAI metre and diazo paper metres can provide similar information to more cumbersome or expensive equipment such as the LAI-2000 metre or hemispherical photographs. All instruments except the densiometre detected differences among seedlings from different post-logging microsites. Few significant correlations were found between light measures and the number of trees or their basal area within 10 m which may reflect an increase in the density of smaller stems and lianas during post-logging succession. light measure tropical forest leaf area index seedling hemispherical photography diazo paper Résumé - Comparaison de cinq méthodes pour caractériser l environnement lumineux de plantules en forêt tropicale. Cinq methodes de mesure de la quantité de lumière disponible dans le sous-bois d une forêt tropicale sont comparées le LAI-2000 PCA un ap-pareil de mesure empirique du LAI un densiomètre des papiers diazo photosensibles et un appareil de photographie hémisphérique. Les mesures ont été effectuées le long de trois transects de 250 m et à proximité de 95 plantules dans quatre parcelles exploitées ou vierges

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