tailieunhanh - Báo cáo lâm nghiệp: "Site index in relation to edaphic variables in stone pine (Pinus pinea L.) stands in south west Spain"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Site index in relation to edaphic variables in stone pine (Pinus pinea L.) stands in south west Spain" | Ann. For. Sci. 62 2005 61-72 INRA EDP Sciences 2005 DOI forest 2004086 61 Original article Site index in relation to edaphic variables in stone pine Pinus pinea L. stands in south west Spain Andrés BRAVO-OVIEDOa b Gregorio MONTEROa a Forest Research Centre CIFOR-INIA Ctra. A Coruna km. 7 5 28040 Madrid Spain b Current address Universidad de Valladolid Dpto Production Vegetal y Recursos Forestales Avda. Madrid s n Edificio E 34004 Palencia Spain Received 30 July 2003 accepted 19 April 2004 Abstract - In this study the capacity of contingency tables and correspondence analysis CA to determine graphically what categories of edaphic variables vary with Site Index SI is analysed. The categories that show association with SI are those related to textural type and water holding capacity. Furthermore 66 discriminant rules are tested for their ability to classify plots into SI classes using edaphic data. A discriminant rule for classifying observations into two SI classes according to elevation and soil texture represented by the silt and clay content is presented for stone pine Pinus pinea L. . This model was chosen based on a cross-validation. The error rate was for the best quality group and for the lowest quality group. correspondence analysis discriminant analysis site index edaphic variable categorical data Pinus pinea L. Résumé - Site index en relation avec les variables du sol pour les peuplements de pin pignon Pinus pinea L. dans le sud-ouest de l Espagne. On a étudié l intérêt des tables de contingence et l analyse de correspondance pour definir d une facon graphique quelles sont les variables du sol les plus reliées aux caractéristiques des stations. Les variables qui sont corrélées avec SI site index sont celles qui sont en relation avec le type de texture et la capacité de rétention en eau. Différentes équations discriminantes basées sur des données édaphologiques ont été testées pour classer les parcelles selon la qualité de station. L .