tailieunhanh - Báo cáo lâm nghiệp: "Modeling the impact of thinning on height development of dominant and codominant loblolly pine trees"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Modeling the impact of thinning on height development of dominant and codominant loblolly pine trees" | Ann. For. Sci. 63 2006 349-354 INRA EDP Sciences 2006 DOI forest 2006015 349 Original article Modeling the impact of thinning on height development of dominant and codominant loblolly pine trees Mahadev SHARMAa Michael SMlTHb Harold E. BURKHARTc Ralph L. Amateisc a Ontario Forest Research Institute Ministry of Natural Resources 1235 Queen Street E Sault Ste Marie P6A 2E5 ON Canada b White Earth Indian Reservation in White Earth Minnesota USA c Department of Forestry Virginia Polytechnic Institute and State University Blacksburg VA 24061 Received 24 June 2005 accepted 3 October 2005 Abstract - Data collected from loblolly pine thinning study plots established in plantations on cutover site-prepared lands were used to evaluate thinning impact on height growth of dominant and codominant loblolly pine trees. Height growth was reduced initially by thinning but was increased after 3 years following thinning. The average total height of dominant and codominant trees in thinned stands exceeded its counterpart in unthinned stands 12 years after thinning. Initial growth response to thinning was less at older stand ages than at younger ages. A model was constructed to characterize the development of height in thinned and unthinned stands. This model reflects the initial suppression of dominant and codominant height growth followed by an acceleration as a result of thinning. site index thinning shock thinning response function Pinus taeda Résumé - Modélisation de l impact de l éclaircie sur le développement en hauteur des arbres dominants et codominants chez Pinus taeda L. Des données récoltées dans des dispositifs expérimentaux d étude des éclaircies installés dans des plantations de Pinus taeda ont été utilisées pour évaluer l impact del éclaircie surlacroissance en hauteur des arbres dominants et co-dominants. Lacroissance en hauteur a été initialement réduite par éclaircie mais s est accrue dans les 3 ans suivant l éclaircie. La moyenne de la hauteur totale des .