TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effects of browsing on shoots and roots of naturally regenerated sessile oak seedlings"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effects of browsing on shoots and roots of naturally regenerated sessile oak seedlings. | Ann. For. Sci. 60 2003 173-178 INRA EDP Sciences 2003 DOI forest 2003010 173 Original article Effects of browsing on shoots and roots of naturally regenerated sessile oak seedlings Michael Drexhage and Francis Colin INRA Nancy Laboratoire d Étude des Ressources Forêt-Bois LERFOB UMR INRA-ENGREF Équipe Croissance et Production 54280 Champenoux France Received 14 January 2002 accepted 19 April 2002 Abstract - Comparison of 145 6- to 7-year-old seedlings of sessile oak Quercus petraea Matt. Liebl. sampled from adjacent fenced and nonfenced plots in an area of a natural regeneration showed only small but significant differences in plant form allometry between plants damaged by browsing and unbrowsed plants. Browsing reduced plant size and changed biomass distribution. Browsed plants had more branches and greater leaf biomass than unbrowsed plants and allocated a higher proportion of biomass to the root system particularly to coarse and tap roots while the stem biomass was not affected. The results suggest that the young tree may survive moderate animal browsing 10 roe-deer per 100 ha 68 of browsed plants with a mean of 4 shoots damaged although it reduces height growth and thus development towards a tree canopy height. browsing natural regeneration Quercus petraea root shoot seedling Résumé - Effets de l abroutissement sur les parties aérienne et racinaire de semis naturels de chêne sessile. Dans une regeneration naturelle de chêne sessile Quercuspetraea Matt. Liebl. nous avons compare la croissance de 145 semis âgés de 6 à 7 ans prélevés à l interieur et à l exterieur d enclos. Des differences significatives de forme et d allometrie ont été trouvées entre les plants abroutis et non abroutis. L abroutissement a réduit la taille du plant et modifie la repartition de la biomasse. Par rapport aux plants non abroutis les plants abroutis présentaient un nombre de branches et une biomasse foliaire plus grande et un rapport de la biomasse des racines plus élevé à .

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