COMPARATIVE-STUDY OF WATER-UPTAKE AND PHOTOSYNTHETIC GAS-EXCHANGE BETWEEN SCRUB AND FRINGE RED MANGROVES, RHIZOPHORA-MANGLE L

dc.contributor.authorLin, G. H.zh_CN
dc.contributor.authorSternberg, L. D. L.zh_CN
dc.contributor.author林光辉zh_CN
dc.date.accessioned2013-12-12T02:24:12Z
dc.date.available2013-12-12T02:24:12Z
dc.date.issued1992zh_CN
dc.description.abstractThe red mangrove (Rhizophora mangle L.) occurs frequently in both scrub and fringe mangrove forests. Our previous study demonstrated that individuals of this mangrove species growing in scrub and fringe forests differ significantly in both morphological and physiological characteristics. To further characterize physiological differences between scrub and fringe mangroves, we compared their differences in water uptake and photosynthetic gas exchange during different seasons. In the wet season (June-October, 1990), scrub mangroves showed lower delta-D and delta-O-18 values of stem water than fringe mangroves, indicating more usage of rain-derived freshwater. In the dry season (Jan-April, 199 1), however, scrub mangroves utilized the same water source as fringe mangroves, reflected by their similar delta-D and delta-O-18 values of stem water. Consistently, there were significant differences in predawn water potentials between scrub and fringe mangroves in the wet season (October 1990) with higher values for scrub mangroves, but no significant differences in the dry season (January 1991). Higher elevation in the scrub forest seems to be the major factor responsible for the shift of water sources in scrub mangroves. On Apr. 27 and Aug. 8, 1990, scrub mangroves showed lower CO2 assimilation rate, stomatal conductance, and intercellular CO2 concentration than fringe mangroves. There were no differences in these gas exchange characteristics on the other two measuring dates: Oct. 17, 1990 and Jan. 11, 1991. Instantaneous water use efficiency was significantly higher for scrub mangroves than for fringe mangroves on three of the four sampling dates. Similarly, leaf carbon isotope discrimination of scrub mangroves was always significantly lower than that of fringe mangroves, indicating higher long-term water use efficiency. Higher water use efficiency in scrub mangroves is a result of stomatal limitation on photosynthesis, which may entail considerable carbon cost to the plants.zh_CN
dc.identifier.citationOecologia,90(3):399-403zh_CN
dc.identifier.issn0029-8549zh_CN
dc.identifier.otherISI:A1992HW29400012zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/65282
dc.language.isoen_USzh_CN
dc.subjectWATER UPTAKEzh_CN
dc.subjectPHOTOSYNTHETIC GAS EXCHANGEzh_CN
dc.subjectSTABLE ISOTOPE RATIOSzh_CN
dc.subjectWATER USE EFFICIENCYzh_CN
dc.subjectSCRUB MANGROVESzh_CN
dc.titleCOMPARATIVE-STUDY OF WATER-UPTAKE AND PHOTOSYNTHETIC GAS-EXCHANGE BETWEEN SCRUB AND FRINGE RED MANGROVES, RHIZOPHORA-MANGLE Lzh_CN
dc.typeArticlezh_CN

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