TAILIEUCHUNG - Báo cáo lâm nghiệp: "Influence of fire and tree-fell on physiological parameters in Quercus ilex resprouts"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Influence of fire and tree-fell on physiological parameters in Quercus ilex resprouts. | Ann Sci For 1996 53 337-346 Elsevier INRA 337 Original article Influence of fire and tree-fell on physiological parameters in Quercus ilex resprouts I Fleck D Grau M Sanjose D Vidal Departament de Biologia Vegetal Unitat de Fisiologia Vegetal Facultat de Biologia Universitat de Barcelona Diagonal 645 08028 Barcelona Spain Received 14 November 1994 accepted 8 January 1996 Summary Variations in the physiology of two kinds of resprout originated after fire and after treefell of Quercus ilex were analyzed under field conditions and compared with respect to the original undisturbed vegetation located within a Mediterranean watershed northeast Spain . Resprouting vegetation of Quercus ilex after fire or after tree-fell showed during the next growing seasons enhanced photosynthesis leaf conductance and Rubisco activity with respect to the original vegetation especially under high temperature irradiance and vapor pressure deficit VPD . The lack of differences in nutrient N C P K and Ca and soluble carbohydrate concentrations in leaves of resprouts originated after fire or after tree-fell indicates the independence of nutrients released by the action of fire and the contribution of underground organs. Differences in leaf mass per area LMA were due to increased thickness in resprouts whereas density was the same. N investment in chlorophylls or Rubisco was not different in control or either kind of resprout. The increased amount of carotenoids in resprouts contributed to providing protection from photoinhibitory processes. Quercus ilex I fire I tree-fell I gas exchange I nutrients I photosynthetic pigments Resume Influence du feu et de I elagage des arbres sur les paramètres physiologiques des rejetons de Quercus ilex. On a étudié les caractéristiques physiologiques d une vegetation de Quer-cus ilex localisée dans une vallée méditerranéenne nord-est de I Espagne après un incendie et I sla-gage des arbres. Les résultats ont ainsi été compares avec ceux d une vegetation sans .

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