tailieunhanh - Báo cáo khoa học: "Five-year field performance of two types of Douglas fir mini-plug transplants in three forest sites in France"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Five-year field performance of two types of Douglas fir mini-plug transplants in three forest sites in France. | Ann. Sci. For. 55 1998 885-897 Inra Elsevier Paris 885 Original article Five-year field performance of two types of Douglas fir mini-plug transplants in three forest sites in France Benoit Généré Cemagref Forest planting stock and genetic resources division domaine des Barres 45290 Nogent-sur-Vernisson France Received 21 October 1997 accepted 18 February 1998 Abstract - To assess the respective abilities of two plant types of Douglas fir mini-plug transplants MPT namely MP 1 and MP 2 three field trials were established by Cemagref in 1991 on sites with very different soil fertility levels. The MPT had been grown at two different nursery sites and therefore were compared to standard seedlings from the same nursery which were 1 year older. Their field performance was followed from planting to age 5 when a complete assessment was made. The results depended on both stock type and planting site. MP 2 stock showed promise especially on medium and low-fertility soils where the cumulative 5-year height growth was increased by 60 and 80 respectively. In contrast MP 1 stock performed less well than its control on all sites and especially on low-fertility soils where the cumulative 5-year height growth was 50 less. Moreover on the medium-fertility soil severe wind-throw occurred at age 4 because of increased root deformities. The performance levels of both controls grown in different nursery sites in 2 or 3 years were actually rather similar irrespective of planting site and seed source. Inra Elsevicr. Paris. mini-plug transplants stock type Pseudotsuga menziesii I plantation soil fertility Resume - Performances de deux types de plants repiqués de Douglas issus de semis en miniplugs 5 ans après plantation sur trois sites forestiers. Pour évaluer Pintérêt de deux types de plants de Douglas semes en mini-plugs puis repiqués MP 1 et MP 2 trois essais en plantation ont été installés en 1991 dans des stations à fertilite variable. Ces deux types de plants ont été produits sur des