Effect of growth form, salinity, nutrient and sulfide on photosynthesis, carbon isotope discrimination and growth of red mangrove (Rhizophora mangle L.)

Lin Guanghui Lin, Leonel Sternberg

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Abstract

Red mangrove, a dominant mangrove species in Florida, frequently occurs in two distinct growth forms, scrub and tall trees. These two growth forms show significant differences in physiology in the field, with lower CO2 assimilation rate, stomatal conductance, and carbon isotope discrmination or higher transpiration efficiency for the scrub form. High salinity, low nutrient level, and high sulfide concentration all significantly decreased CO2 assimilation, stomatal conductance, and plant growth, but only salinity significantly decreased intercellular CO2 concentration and leaf carbon isotope discrimination, suggesting that the lower carbon isotope discrimination, or higher transpiration efficiency, observed for scrub mangroves in the field is caused only by high salinity during the dry season. Hypersalinity thus seems to be one of the stressful environmental conditions common to all scrub red mangrove forests studied in S Florida. -from Authors

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalAustralian Journal of Plant Physiology
Volume19
Issue number5
StatePublished - Dec 1 1992

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ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

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