tailieunhanh - Báo cáo khoa học: "Measuring the impact of Collybia fusipes system of oak trees"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Measuring the impact of Collybia fusipes system of oak trees. | 227 Ann. For. Sci. 56 1999 227-235 Inra Elsevier Paris Original article Measuring the impact of Collybia fusipes on the root system of oak trees Benoit Marẹais Olivier Cael Claude Delatour Unite des ecosystèmes forestiers laboratoire de pathologie forestiere Inra 54280 Champenoux France Received 8 July 1998 received 15 September 1998 Abstract - This work describes the aetiology of Collybia fusipes root rot and the impact of the parasite on the structure of mature oak root systems. The collar roots were examined and rated for c. fusipes infection at the base of 26 Quercus robur and 20 Q. rubra trees. Trees were then felled and their root systems were up-rooted with a mechanical shovel. Number and infection status of the roots present were recorded at 40 60 and 80 cm from the trunk base. c. fusipes drastically reduced the number of living roots. At 80 cm from the trunk base on cylinder 3 Q. robur rated as lightly and heavily damaged had only 52 and 25 respectively the frequency of living roots of undamaged trees the values were 72 and 25 respectively for lightly and heavily damaged Q. rubra trees c. fusipes impacted especially the vertical roots just under the collar. Inra Elsevier Paris. Quercus Collybia fusipes root rot incidence Resume - Mesure de Pimpact de Collybia fusipes sur le système racinaire des chênes. Ce travail décrit rétiologie du pourridié à Collybia fusipes et 1 impact du parasite sur le système racinaire des chênes. Le depart des racines mattresses a été examine et note pour 1 infection par la collybie chez 26 Quercus robur et 20 Q. rubra. Les arbres ont ensuite été abattus et leur système racinaire extrait avec une pelle mécanique. Le nombre de racines présentes et leur état sanitaire ont été determine à 40 60 et 80 cm du collet. La collybie diminuait fortement le nombre de racines Vivantes présentes. Les arbres gravement attaqués à 1 examen précédant 1 arra-chage n avaient plus à 80 cm de la base du tronc que 25 du nombre de racines Vivantes des .