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Authors PEZESHKI, SR; DELAUNE, RD
Author Full Name PEZESHKI, SR; DELAUNE, RD
Title EFFECTS OF SOIL HYPOXIA AND SALINITY ON GAS-EXCHANGE AND GROWTH OF SPARTINA-PATENS
Source MARINE ECOLOGY PROGRESS SERIES
Language English
Document Type Article
Keywords Plus PHASEOLUS-VULGARIS L; PHYSIOLOGICAL-RESPONSES; ALTERNIFLORA-LOISEL; STOMATAL BEHAVIOR; AVICENNIA-MARINA; TOMATO PLANTS; LEAF TISSUE; PHOTOSYNTHESIS; MANGROVE; REDUCTION
Abstract Laboratory experiments were conducted to evaluate the effects of increased soil salinity on gas exchange functioning and growth of the brackish-marsh grass Spartina patens (Ait) Muhl. under controlled soil redox potentials (Eh) which were maintained at either aerobic (+489 mV) or hypoxic (-40 mV) conditions, Plants were subjected to salinities of 0, 5, 15 and 25 ppt gradually over a 7 d period and leaf tissue chlorophyll content, gas exchange and growth responses were measured. Leaf tissue chlorophyll content was not affected by the treatments. Gas exchange of S. patens was adversely influenced by increases in salinity. Leaf conductance was reduced by 36 % and net photosynthesis by 23 % of control plants under aeration plus 25 ppt salinity, and water use efficiency increased to 161 % of control plants. When increased salinity accompanied hypoxia, leaf conductance and net photosynthesis were reduced by 60 and 44 % of control plants, respectively. The interaction between salinity and hypoxia was not significant. Salinity of 25 ppt reduced root dry weight, leaf dry weight and height growth significantly. Salinity and hypoxia combined affected various biomass components while hypoxia primarily affected root dry weights. Elevated salinity and hypoxia also adversely affected gas exchange functions and growth. Results presented suggested that saltwater intrusion is a major factor contributing to the rapid rate of marsh deterioration in coastal Louisiana (USA) brackish marshes which are dominated by S. patens.
Reprint Address PEZESHKI, SR (corresponding author), LOUISIANA STATE UNIV, CTR COASTAL ENERGY & ENVIRONM RESOURCES, WETLAND BIOGEOCHEM INST, BATON ROUGE, LA 70803 USA.
ResearcherID Number DeLaune, R.D./A-2058-2012
Times Cited 27
Total Times Cited Count (WoS, BCI, and CSCD) 29
Publisher INTER-RESEARCH
Publisher City OLDENDORF LUHE
Publisher Address NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY
ISSN 0171-8630
29-Character Source Abbreviation MAR ECOL PROG SER
ISO Source Abbreviation Mar. Ecol.-Prog. Ser.
Publication Date JUN
Year Published 1993
Volume 96
Issue 1
Beginning Page 75
Ending Page 81
Digital Object Identifier (DOI) 10.3354/meps096075
Page Count 7
Web of Science Category Ecology; Marine & Freshwater Biology; Oceanography
Subject Category Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography
Document Delivery Number LH806
Unique Article Identifier WOS:A1993LH80600007
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