Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo lâm nghiệp:" Hydrological and climatic responses of Pinus elliottii var. densa in mesic pine flatwoods Florida, USA"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Hydrological and climatic responses of Pinus elliottii var. densa in mesic pine flatwoods Florida, USA" | 385 Ann. For. Sci. 60 2003 385-392 INRA EDP Sciences 2003 DOI 10.1051 forest 2003030 Original article Hydrological and climatic responses of Pinus elliottii var. densa in mesic pine flatwoods Florida USA Chelcy Rae FORDa b Jacqueline Renée Brooksc a Department of Biology University of South Florida Tampa FL 33620-5150 USA b Present address Warnell School of Forest Resources University of Georgia Athens GA 30602-2152 USA c U.S. EPA NHEERL Western Ecology Division Corvallis OR 97333 USA Received 4 January 2002 accepted 18 September 2002 Abstract - Pinus elliottii Engelm. var. densa Little Dorman is the only native sub-tropical pine in the US and is now restricted to an estimated 4.5 of its original area. To understand how this species might respond to changing environments we examine the relationship between two hydrologic variables and growth of three stands of P. elliottii var. densa occurring along a hydrologic gradient using tree-ring records. The two variables were a short-term indicator of water status precipitation minus potential evapotranspiration P-PET and a long-term indicator of water status runoff R . Growth at all sites was positively correlated to current growing season P-PET and R and strongly negatively correlated with previous winter R. The positive correlation with spring R was greater in the site with the deepest water table than in sites with shallower water tables. We discuss the potential for root dynamics to explain the relationships between growth and R. south Florida slash pine Pinus elliottii var. densa dendrochronology tree-ring runoff potential evapotranspiration Résumé - Reaction de Pinus elliottii var. densa aux conditions hydrologiques et climatiques dans les forêts de plaine mésoique. Pinus elliottii Engelm. Var densa Little et Dorman est la seule espèce de pin subtropicale des Etats-Unis. Elle n occupe plus que 4 5 de son aire d origine. Afin de comprendre comment cette essence pourrait réagir face à un changement des conditions de .