TAILIEUCHUNG - Báo cáo lâm nghiệp: "Responses of photosynthesis and stomatal conductance to atmospheric humidity in some mediterranean Abies specie"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Responses of photosynthesis and stomatal conductance to atmospheric humidity in some mediterranean Abies species. | 401s Ann. Sci. For. 1989 46 suppl. 401s-405s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Responses of photosynthesis and stomatai conductance to atmospheric humidity in some mediterranean Abies species . Guehl1 J. Bouachrine1 R. Zimmermann2 and E. Dreyer1 If-aboratoire de Bioclimatologie-Ecophysiologie Forestiere station de Sylviculture et Production INRA Centre de Nancy F-54280 Seichamps France and 2Lehrstuhl fur Pfanzenokologie Universităt Bayreuth Postfach 3003 D-8580 Bayreuth . Introduction Leaf gas-exchange has long been shown to be sensitive to changes in the water vapor mole fraction difference between the leaf and the air Aw Sandford and Jarvis 1986 Schulze 1986 . It has been proposed Guehl and Aussenac 1987 Grieu et al. 1988 that decreasing co2 assimilation in response to increasing Aw is not only due to stomatai closure but could be at least partially a consequence of altered mesophyll photosynthetic capacity. However that interpretation is not consensual Terashima et al. 1988 . We report herein results providing further evidence for the existence of a mesophyll effect in response to increasing Aw in some mediterranean Abies species. The study was also aimed at determining whether the different species examined exhibit differences in their water use efficiencies. Materials and Methods Responses of co2 assimilation rate A and transpiration rate E to varying Aw were as sessed under controlled environmental conditions with an open gas-exchange measurement system on intact or excised shoots of different mediterranean coniferous species stomatai conductance gg and intercellular co2 concentration Cj were calculated from the gasexchange data using classical equations see Guehl and Aussenac 1987 . Prior to Aw being increased the short-term response of gasexchange to increasing ambient co2 concentration Ca was assessed and the corresponding A C functions were determined thus allowing the analysis of co2 assimilation in terms of mesophyll .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp