TAILIEUCHUNG - Báo cáo lâm nghiệp: "Physiological, morphological and growth responses to rhizosphere hypoxia by seedlings of North American bottomland oaks"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Physiological, morphological and growth responses to rhizosphere hypoxia by seedlings of North American bottomland oaks. | Ann Sci For 1996 53 303-316 Elsevier INRA 303 Original article Physiological morphological and growth responses to rhizosphere hypoxia by seedlings of North American bottomland oaks ES Gardiner JD Hodges Forest and Wildlife Research Center Mississippi state University Mississippi State MS 36762 USA Received 2 November 1994 accepted 29 June 1995 Summary Bottomland oak species of the southern United States are distributed along topographical gradients in floodplains. Because differences in soil aeration are associated with these gradients we tested the hypothesis that oak species will exhibit diverging resistances to rhizosphere hypoxia. Four species which occupy different sites in floodplains Quercus lyrata Q laurifolia Q phellos and o nigra were used in two experiments designed to examine seedling responses during establishment and late in the first growing season. In both experiments hypoxia tolerance was evaluated through measurements of gas exchange biomass accumulation and shoot and root growth. Evidence of oaks differing in resistance to rhizosphere hypoxia is presented and results are discussed in relation to species distribution in floodplains. rhizosphere hypoxia Quercus lyrata I Quercus laurifolia I Quercus phellos I Quercus nigra I eco-physiology Resume Réponses physiologiques et morphologiques et de croissance à I hypoxie rhizo-sphérique de chênes des plaines inondables d Amerique du Nord. Certaines espèces de chênes du sud des États-Unis sont distribuées le long de gradients topographiques dans les plaines inon-dables. Du fait des differences dans I aeration des sols assoclées à ces gradients nous avons teste 1 hypothèse que ces espèces présentent des resistances differentes à I hypoxie rhizospherique. Quatre espèces occupant differents sites des plaines inondables Quercus lyrata Q laurifolia Q phellos et Q nigra ont été soumises à deux experimentations pour évaluer les réponses des plantes au début et à la fin de la premiere saison. Dans les deux .

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