TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effects of resource availability on condensed tannins and nitrogen in two Quercus species differing in leaf life span"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effects of resource availability on condensed tannins and nitrogen in two Quercus species differing in leaf life span. | Ann. For. Sci. 64 2007 439-445 INRA EDP Sciences 2007 DOI forest 2007021 Available online at Original article Effects of resource availability on condensed tannins and nitrogen in two Quercus species differing in leaf life span Marc ESTlARTEa Montserrat De CASTROb Josep Maria ESPELTAb a Unitat d Ecofisiologia CSIC-CEAB-CREAF CREAF Centre de Recerca Ecològica i Aplicacions Forestals Universitat Autònoma de Barcelona 08193 Bellaterra Catalonia Spain b Centre de Recerca Ecològica i Aplicacions Forestals CREAF Universitat Autònoma de Barcelona 08193 Bellaterra Catalonia Spain Received 2 June 2006 accepted 8 November 2006 Abstract - Seedlings of Quercus ilex and Q. cerrioides an evergreen and a winter-deciduous oak co-occurring in western-Mediterranean forests were grown at two light regimes 8 and 36 of photosynthetically active radiation at two water regimes 500 and 800 mm and with two nutrient availabilities standard substrate and 7 increase in soil N . The concentrations of soluble condensed tannins CT and nitrogen in the leaves were analyzed to test the phenotypic plasticity of these commonly related parameters in two con-generic species with contrasting leaf habit. Q. ilex contains seven times more CT and a few less N than Q. cerrioides. Light increased CT whereas neither fertilization nor water had an effect on CT. N concentration was decreased by light increased by fertilization and not affected by water treatment. Plant growth was increased by light but not affected by fertilization or water treatment. CT were negatively correlated with N concentration. CT of the evergreen species exhibited greater plasticity than the deciduous one as reflected by a steeper negative correlation among nitrogen and CT concentrations in Q. ilex. Given the antiherbivory activity of CT this implies that in less shaded environments . canopy aperture by disturbances leaf tissue quality for herbivores will be much more reduced in Q. ilex than in Q. .

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