tailieunhanh - Báo cáo khoa học: "The study of tree fine root distribution and dynamics using a combined trench and observation window method"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "The study of tree fine root distribution and dynamics using a combined trench and observation window method. | Ann. Sci. For. 19S9 46 3 283-290 Elsevier INRA 283 Original article The study of tree fine root distribution and dynamics using a combined trench and observation window method M. Bédéneau and D. Auclair INRA Station de Sylviculture Centre de Recherches d Orleans Ardon F 45160 Olivet France received 5 tévrier 1988 accepted 6 décembre 1988 Summary Root distribution and growth were studied in a natural oak-birch coppice by combining the trench and observation window methods. Root weight was estimated while digging the trench showing that 90 percent of dry weight is situated in the upper 50 centimetres of soil. Root position was analyzed using variograms a cluster effect was observed around 50 cm for old roots and 20 cm for new roots. Oak and birch appeared to have different seasonal root elongation patterns. The results are discussed in relation to the methods employed. Tree - root - distribution - profile - spatial distribution - coppice - birch - oak Résumé Etude de la distribution et de la dynamique des fines racines combinant les techniques de tranchée et de fenetre d observation en forêt. Dittérentes méthodes ont été utilisées pour observer in situ et caractériser le système racinaire d arbres forestiers dans un taillis mélangé de chênes et de bouleaux. La biomasse racinaire estimée au moment du creusement de la tranche se trouve localisée en grande partie 90 dans les 50 centimètres supérieurs. La position des ratines étudiée à I aide de variogrammes montre des phénomènes d agrdgation de I ordre de 50 cm pour les vieilles ratines et de 20 cm pour les ratines jeunes. Chêne et bouleau présentent des vagues de croissance ratinaire differentes. Ces résultaís sont discutés en fonction des techniques utilisées. Arbre - racine - distribution - profit - distribution spatiale - taillis - Betula - Quercus Introduction The great majority of studies concerning forest tree root systems has been carried out on artificially cultivated young plants. Only a few studies have dealt

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