TAILIEUCHUNG - Báo cáo lâm nghiệp: "Are ecophysiological responses influenced by crown position in cork-oak?"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Are ecophysiological responses influenced by crown position in cork-oak?. | 235 Ann Sci For 1996 53 235-241 Elsevier INRA Short note Are ecophysiological responses influenced by crown position in cork-oak G Oliveira c Werner o Correia Secọão de Ecologia e Sistemática dos Vegetais Dep de Biologia Vegetal Faculdade de Cienclas de Lisboa Campo Grande C2 4 1700 Lisbon Portugal Received 31 October 1994 accepted 18 July 1995 Summary Montados and dehesas of Quercus ilex and Quercus Suber occupy large areas in the Iberian Peninsula and are characterized by a low-density tree cover. The variability of responses within tree canopies in such open stands has been little studied. We investigated the variation of stomatai conductance within the crown of a cork-oak O Suber L by studying its diurnal and seasonal courses at two different heights and four directions within the canopy. Height did not strongly affect leaf response as a consequence of the crown structure. Differences were found in microclimatic conditions and maximum stomatai conductance among directions. However overall daily stomatai conductance was similar among different crown sections suggesting that leaves develop different mechanisms to accomodate the microclimatic constraints which affect the particular position they occupy in the crown of cork-oak. cork-oak isolated tree I microclimate I stomatai conductance I within-crown variability Resume Les réponses écophysiologiques sont-elles influencees par la position des feuilles dans la couronne du chêne-liège Les montados ef dehesas de Quercus ilex et Quercus suber constituent une partie importante du couvert vegetal de la péninsule Ibérique et se caractérlsent par une basse densité d arbres. La variabilité de réponses au sein des canopées de ces arbres a été peu étudiée jusqu a present. L evolution journaliere et saisonnière de la conductance stomatique à differentes hauteurs et expositions a été étudiée au sein de la canopée d un chêne-liège Q suber L . La hauteur n a pas influence la réponse des feuilles. En revanche on a trouvé des .

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