tailieunhanh - Báo cáo toán học: "Root and shoot hydraulic conductance of seven Quercus specie"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Root and shoot hydraulic conductance of seven Quercus species. | 371 Ann. For. Sci. 56 1999 371-377 Inra Elsevier Paris Original article Root and shoot hydraulic conductance of seven Quercus species Andrea Nardinia Melvin T. Tyreeb a Dipartimento di Biologia Università di Trieste Via L. Giorgieri 10 34127 Trieste Italy bUSDA Forest Service Northeastern Forest Experiment Station 705 Spear Street Burlington VT 05402-0968 USA Received 13 November 1998 accepted 22 February 1999 Abstract - The root KR and shoot Ks hydraulic conductances of seven different Quercus species as well as the leaf blade hydraulic resistance RLL were measured in potted plants with the aim of understanding whether a relationship exists between the hydraulic architecture and the general ecological behaviour of different species of this genus. The KR values were scaled by dividing by root surface area KRR and by leaf surface area KRL and the Ks values were scaled by dividing by leaf surface area KSL . The likely drought-adapted species Quercus tuber Q. pubescent Q. petraea showed lower K t and KRR lower KSL and higher R with respect to the known water-demanding species g. alba Q. cerris Q. robur Q. rubra . The possible physiological and ecology cal significance of such differences are discussed. Inra Elsevier Paris. root hydraulic conductance shoot hydraulic conductance leaf blade resistance Quercus high pressure flow meter Resume - Les conductivités hydrauliques de la racine et de la tige de sept espèces de Quercus. Les conductivités hydrauliques de la racine KR et de la tige Ks et la resistance hydraulique des feuilles RLL des sept espèces de Quercus ont été mesurées avec pour objectif la comprehension de la relation qui existe entre récologie de 1 espèce et son architecture hydraulique. Les valeurs des Kr ont été divisées par les surfaces des feuilles KRL et des racines KRR celles des Ks par les surfaces des feuilles KSL . Les KRR Krl et Ksl des espèces adaptées aux environnements arides Q. tuber Q. pubescent Q. petraea sont inferieures et leurs R L .