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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.accessioned2013-12-12T02:24:11Z
dc.date.available2013-12-12T02:24:11Z
dc.date.issued1994zh_CN
dc.identifier.citationBulletin of Marine Science,54(1):94-102zh_CN
dc.identifier.issn0007-4977zh_CN
dc.identifier.otherISI:A1994NG91900009zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/65259
dc.description.abstractPhysiological responses of mangroves to salinity changes in the field are difficult to quantify, partly because it is still not clear whether mangroves utilize mostly surface water, as believed by many researchers based on the shallow distribution of mangrove roots in anaerobic soils. To test this axiom, we analyzed oxygen isotope ratios of possible water sources in different soil layers and stem water from red mangroves (Rhizophora mangle L.), a dominant mangrove species in Florida, which occurs frequently in two distinct growth forms: dwarf and tall mangroves. deltaO-18 values of stem water from both dwarf and tall mangroves always matched those of surface water, indicating that they utilize mostly the surface water. Consistently, most fine roots (about 70%) of dwarf mangroves occur in this upper soil layer. deltaO-18 values of stem water from both dwarf and tall mangroves showed significant changes from the dry season (high values) to the wet season (low values), corresponding to the isotopic and salinity variation in surface water during this period. Fine root biomass also showed a significant increase in the wet season as response to the decrease in salinity of soil surface water. Predawn water potentials decreased with increasing deltaO-18 values of stem water, while midday water potentials did not show such relationship. The dependence of mangroves on surface water as their sole water source has significant implications for plant water relations, and may explain growth form differentiation in some mangrove species of southern Florida.zh_CN
dc.language.isoen_USzh_CN
dc.subjectSTOMATAL RESPONSESzh_CN
dc.subjectAVICENNIA-MARINAzh_CN
dc.subjectFRESH-WATERzh_CN
dc.subjectSALINITYzh_CN
dc.subjectPLANTzh_CN
dc.subjectPHOTOSYNTHESISzh_CN
dc.subjectFLORIDAzh_CN
dc.subjectRATIOSzh_CN
dc.subjectTREESzh_CN
dc.subjectSCRUBzh_CN
dc.titleUTILIZATION OF SURFACE-WATER BY RED MANGROVE (RHIZOPHORA-MANGLE L) - AN ISOTOPIC STUDYzh_CN
dc.typeArticlezh_CN


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