tailieunhanh - Báo cáo khoa học: "Germination behaviour of 3 species of the genus Pinus in relation to high temperatures suffered during forest fires"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Germination behaviour of 3 species of the genus Pinus in relation to high temperatures suffered during forest fires. | Ann Sci For 1995 52 385-392 Elsevier INRA 385 Original article Germination behaviour of 3 species of the genus Pinus in relation to high temperatures suffered during forest fires o Reyes M Casal Area de Ecologia Dpto de Biologia Fundamental Fac de Biologia Univ de Santiago de Compostela 15071 Santiago de Compostela Spain Received 17 May 1994 accepted 1st Feburary 1995 Summary The action of fire was simulated in the laboratory using thermic shocks. To this aim samples of seeds of Pinus pinaster p radiata and p sylvestris were subjected to high temperatures. Following the treatments both the treated and untreated seeds were sown under standard laboratory conditions. The results of the germination test demonstrated that significant differences exist between the behaviour of the 3 species but none of them were seen to be specially favoured by the high temperatures. germination fire high temperatures Pinus Resume Réponse germinative de 3 espèces de Pinus en relation avec les temperatures élevées atteintes au moment des feux de forets. On a simulé faction du feu en utilisant des chocs thermiques. Des échantillons de semences de Pinus pinaster p radiata et p sylvestris ont été exposes à de hautes temperatures. Ensuite les semences traitées et non traitées ont été semées en conditions standard au laboratoire. Les résultats des tests de germination ont montré des differences significatives entre les 3 espèces mais aucune d elles n a été spécialement stimulée sous faction des hautes temperatures. germination feu hautes temperatures Pin US INTRODUCTION Intensity is one of the most important characters of a disturbance regime and particularly that of fire Malanson 1984 Sousa 1984 . Two factors characterize the strength of a fire the period of time and the temperature reached. These 2 factors are very important as on these will depend the number of seeds available for germination the 386 o Reyes M Casal possibility of sprouting and the characteristics of the populations and .