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Báo cáo khoa học: "Effects of desiccation and freezing on vitality and field performance of broadleaved tree species"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Effects of desiccation and freezing on vitality and field performance of broadleaved tree species. | 59 Ann. For. Sci. 58 2001 59-68 INRA EDP Sciences 2001 Original article Effects of desiccation and freezing on vitality and field performance of broadleaved tree species Kalliopi Radoglou and Yannis Raftoyannis Forest Research Institute Vassilika GR-57006 Thessaloniki Greece Received 23 November 1999 accepted 15 May 2000 Abstract - Seedlings of Acer pseudoplatanus L. Fraxinus ornus L. and Castanea sativa Miller. were exposed to desiccating conditions 15 C 50 RH air movement 0.3 ms-1 photosynthetic active radiation 350 1 mol m-2 s-1 and freezing -5 C darkness . The effect of stress factors on seedling quality was assessed using root electrolyte leakage water potential and moisture content of fine roots. After treatments seedlings were outplanted in a field site. The effects of desiccation and freezing on planting stock quality and field performance varied and depended upon the length of exposure and species. Root electrolyte leakage values were significantly related to field performance rates of seedlings exposed to both stress factors. Root moisture content and root water potential were related to survival only in the case of desiccation treatment. seedling quality survival planting stock desiccation freezing Résumé - Effets du dessèchement et de la congelation sur la vitalité et la performance des plants d especes arborées platy-phylles. Des plants d Acer pseudoplatanus L. Fraxinus ornus L. et Castanea sativa Miller ont été soumis à des traitements condi-tionnés contrôlés de dessèchement 15 C 50 HR mouvement d air 0.3 ms-1 PAR 350 gmol m-2 s-1 et de congélation à -5 C dans l obscurité . Les effets de ces facteurs de stress sur la qualité des plants ont été établis par la mesure de la perte relative en élec-trolyte du potentiel hydrique et de la teneur en eau des racines fines. Après ces traitements les plants ont été installés en plantation. Les effets du dessèchement et de la congélation sur la qualité et la performance des plants varient et dépendent du temps d