tailieunhanh - Báo cáo lâm nghiệp: "Growth and yield model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Growth and yield model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain. | Ann. For. Sci. 61 2004 9-24 INRA EDP Sciences 2004 DOI forest 2003080 9 Original article Growth and yield model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia north-east Spain Antoni TRASOBARESa Timo PUKKALAb Jari MIINAc a Centre Tecnològic Forestal de Catalunya Pujada del seminari s n 25280 Solsona Spain b University of Joensuu Faculty of Forestry PO Box 111 80101 Joensuu Finland c Finnish Forest Research Institute Joensuu Research Centre PO Box 68 80101 Joensuu Finland Received 13 May 2002 accepted 18 October 2002 Abstract - A distance-independent diameter growth model a static height model an ingrowth model and a survival model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia north-east Spain were developed. Separate models were developed for P. sylvestris and P. nigra. These models enable stand development to be simulated on an individual tree basis. The models are based on 922 permanent sample plots established in 1989 and 1990 and remeasured in 2000 and 2001 by the Spanish National Forest Inventory. The diameter growth models are based on 8058 and 5695 observations the height models on 8173 and 5721 observations the ingrowth models on 716 and 618 observations and the survival models on 7823 and 5244 observations respectively for P. sylvestris and P. nigra. The relative biases for the height models are for P. sylvestris and for P. nigra. The biases for the diameter growth models are zero due to the applied Snowdon correction. The biases of the ingrowth models are zero due to the applied fitting method. The relative RMSE values for the P. sylvestris and P. nigra models respectively are and for diameter growth and for height and and for ingrowth. growth and yield mixed-species stand uneven-aged stand mixed models simulation Résumé - Modèle de croissance pour des peuplements irréguliers et melanges de Pinus sylvestris L. et Pinus nigra Arn. en .