Transpirational Characteristics of Mangrove Species in Southern Thailand.
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概要
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In order to investigate the seasonal change of transpiration in mangrove species, the sap flow rates (<I>F</I><SUB>s</SUB>) in <I>Bruguiera cylindrica</I> were measured in southern Thailand, with a stem heat balance method. From the result, the transpiration rates (<I>T</I><SUB>r</SUB>) normalized by leaf area in wet and dry seasons were estimated to be 0.50 and 1.04 kg m<SUP>-2</SUP> d<SUP>-1</SUP> on the average, respectively. <I>T</I><SUB>r</SUB> in the dry season was rather high compared to that in the wet season. This was probably caused by the difference of meteorological conditions, such as solar radiation and air humidity. Moreover, stomatal conductance (<I>g</I>s) in 4 species, Rhizophora apiculata, Ceriops decandra, Xylocarpus moluccensis and B. cylindrica, was measured in the wet season with a porometry to investigate its interspecific difference. In all the species, <I>g</I><SUB>s</SUB> reached a plateau at the PPFD of 200 to 400μmol m<SUP>-2</SUP> s<SUP>-1</SUP>. The plateau in <I>R. apiculata</I> was estimated to be between 150 and 250 mmol m<SUP>-2</SUP> s<SUP>-1</SUP> ; the level is similar to that in evergreen trees in Japan. However, <I>g</I><SUB>s</SUB> in the remaining 3 species was rather low.
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