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	UTILIZATION OF SURFACE-WATER BY RED MANGROVE (RHIZOPHORA-MANGLE L) - AN ISOTOPIC STUDY
	Lin, G. H. ; Sternberg, L. D. L. ; Lin GH(林光辉)
	1994
关键词	STOMATAL RESPONSES AVICENNIA-MARINA FRESH-WATER SALINITY PLANT PHOTOSYNTHESIS FLORIDA RATIOS TREES SCRUB
英文摘要	Physiological 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.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/65259]
专题	生命科学－已发表论文
推荐引用方式 GB/T 7714	Lin, G. H.,Sternberg, L. D. L.,Lin GH. UTILIZATION OF SURFACE-WATER BY RED MANGROVE (RHIZOPHORA-MANGLE L) - AN ISOTOPIC STUDY[J],1994.
APA	Lin, G. H.,Sternberg, L. D. L.,&林光辉.(1994).UTILIZATION OF SURFACE-WATER BY RED MANGROVE (RHIZOPHORA-MANGLE L) - AN ISOTOPIC STUDY..
MLA	Lin, G. H.,et al."UTILIZATION OF SURFACE-WATER BY RED MANGROVE (RHIZOPHORA-MANGLE L) - AN ISOTOPIC STUDY".(1994).

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