tailieunhanh - Báo cáo lâm nghiệp:"Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence" | Ann. For. Sci. 60 2003 419-426 INRA EDP Sciences 2003 DOI forest 2003034 419 Original article Relationships between soil factors Quercus robur health Collybia fusipes root infection and Phytophthora presence Cécile Camy Claude Delatour Benoit Marqais Unité de Pathologie Forestiere INRA Centre de Nancy 54280 Champenoux France Received 22 March 2002 accepted 5 August 2002 Abstract - About sixty oaks Quercus robur with different status of crown health located in three plots in north eastern France were assessed for their degree of infection by . Baiting of Phytophthora spp. from soil was carried out at different seasons in a sub sample of these oaks. The variability of soil characteristics such as depth to waterlogging signs and depth to a gravel layer limiting rooting was evaluated. Soil factors were tightly correlated. Infection induced by was significantly more severe in non-waterlogged conditions. In two plots Phytophthora spp. were present at the base of the majority of trees investigated. Success of Phytophthora isolation was significantly linked with the season. The crown health status deteriorates with increasing severity of infection by C. fusipes and with the depth to waterlogging. Conversely Phytophthora was not correlated with crown health status. Quercus Collybiafusipes root rot fungus Phytophthora sp. oak decline Résumé - Relations entre les facteurs du sol l état du houppier de Quercus robur les infections racinaires induites par Collybia fusipes et la présence de Phytophthora. Le niveau d infection induit par Collybia fusipes a été évalué sur environ 60 chênes pédonculés Quercus robur présentant différents états sanitaires situés dans trois parcelles du nord-est de la France. Le piégeage des Phytophthora spp. présents dans le sol a été effectué sur un sous-échantillon de chênes à différentes saisons. La variabilité des facteurs du sol concernant la profondeur d apparition des traces d hydromorphie et la profondeur d .