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Báo cáo toán học: "quality and field performance of Douglas fir seedlings under varying degrees of water stress"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: quality and field performance of Douglas fir seedlings under varying degrees of water stress. | 501 Ann. For. Sci. 56 1999 501-510 Inra Elsevier Paris Original article stock quality and field performance of Douglas fir seedlings under varying degrees of water stress Benoit Généréa Didier Garriouab 11 Forest planting stock and genetic resources division Cemagref domaine des Barres 45290 Nogent-sur-Vernisson France bInstitut Jules Guyot université de Bourgogne BP 138 21004 Dijon France Received 3 February 1998 accepted 31 May 1999 Abstract - An experiment was carried out on 12 Douglas fir seedling lots that were 3 years old and had all originated from the same seed lot. Treatments consisted in combining stock type with three different height to diameter ratios storage duration and method long at 2 C or short in various conditions and protection from desiccation by bagging or not . Seedling lots were assessed at planting by root electrolyte leakage REL root moisture content RMC and predawn shoot water potential Ỵ They were planted simultaneously in well-watered or water-stressed conditions. Performance level was based on survival and height growth at the end of the growing season. Slender seedlings not bagged had the lowest values of RMC tgwp and field performance. The sturdier stock type was less sensitive to desiccation and had 100 survival in all stress conditions. In contrast to RMC and Vwp REL was not influenced by stock type. RMC and vwp values were highly correlated on a seedling basis as on a batch basis. RMC was the best predictor of the field performance parameters survival and growth for both water regimes which were all well correlated. Moreover lower stock quality resulted mainly in slower growth in the well-watered field trial and in poor survival under drought conditions. Inra Elsevier Paris. planting stock plant water status Pseudotsuga menziesii I seedling morphology transplanting shock Resume - Qualite et performance de plants de douglas soumis à differentes contraintes hydriques. L experience décrite com-prenait 12 lots de plants de douglas .