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Publication Type J
Authors Romero, IC; Feakins, SJ
Author Full Name Romero, Isabel C.; Feakins, Sarah J.
Title Spatial gradients in plant leaf wax D/H across a coastal salt marsh in southern California
Source ORGANIC GEOCHEMISTRY
Language English
Document Type Article
Keywords Plus RATIO MASS-SPECTROMETRY; DELTA-D VALUES; HYDROGEN-ISOTOPIC VARIABILITY; N-ALKANES; LIPID BIOSYNTHESIS; INFRARED-SPECTROSCOPY; SURFACE SEDIMENT; ORGANIC-MATTER; AQUATIC PLANTS; WATER-UPTAKE
Abstract Coastal salt marsh ecosystems contain strong environmental gradients that are anticipated to influence the D/H ratios recorded in the leaf waxes of salt-tolerant plants. We characterized the molecular and hydrogen isotopic composition of alkanes in plant and sediment samples as well as the D/H ratios of environmental and plant waters across an elevation and inundation gradient in a southern Californian, coastal salt marsh. We sampled the dominant salt marsh plant species: Salicornia virginica, Arthrocnemum subterminale and Jamuea carnosa (all succulents), as well as Monanthochloe littoralis and Limonium californicum (nonsucculents). Plant xylem water hydrogen isotopic compositions indicate a shift in source waters from meteoric influences at upland sites (delta D value -20 parts per thousand) to seawater dominated values (0 parts per thousand) at lowland areas. We found leaf water D enrichment relative to xylem water ranging from mean dD values of +54 parts per thousand(upland) to +28 parts per thousand (lowland), interpreted as a reduction of transpiration with increasing inundation time. This has the effect of increasing the net fractionation between source water and leaf wax product across the environmental gradient from mean values of -101 parts per thousand (upland) to -134 parts per thousand (lowland), with an attenuated signal recorded in the dD values of plant leaf wax n-alkanes (-122 parts per thousand to -136 parts per thousand). These results constrain the hydrogen isotopic composition of salt marsh organic matter that may contribute to marine carbon budgets of the Santa Barbara Basin, and further indicate the potential for plant leaf waxes to resolve paleoenvironmental change, including sea level change, in sediment cores from salt marsh ecosystems. (C) 2011 Elsevier Ltd. All rights reserved.
Author Address [Romero, Isabel C.; Feakins, Sarah J.] Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA
Reprint Address Romero, IC (reprint author), Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA.
E-mail Address iromero@usc.edu
ResearcherID Number Feakins, Sarah/K-4149-2012
ORCID Number Feakins, Sarah/0000-0003-3434-2423
Funding Agency and Grant Number State California Resources Agency [OCA 6A478]; University of Southern California
Funding Text Our study was conducted at the University of California Natural Reserve System's Carpinteria Salt Marsh Reserve. We thank A.J. Brooks of the UCNRS for support and tour of the reserve, and R. Hechinger for providing images of the study area. We thank L. Sternberg for advice on plant and sediment water extractions, the Laboratory of Stable Isotope Ecology of Tropical Ecosystems (L7) at the University of Miami for isotope analysis of water samples via IRMS, M. Rincon for lab assistance, K. Culbert for field assistance, and G. Toro for GIS support. We appreciate comments from Alex Sessions, Associate Editor Lorenz Schwark and two anonymous reviewers, whose suggestions improved the manuscript. This research was supported by funding from State California Resources Agency Sea Grant Advisory Panel (RASGAP, award number OCA 6A478) and from the University of Southern California to S.F.
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Cited Reference Count 54
Times Cited 15
Total Times Cited Count (WoS, BCI, and CSCD) 15
Publisher PERGAMON-ELSEVIER SCIENCE LTD
Publisher City OXFORD
Publisher Address THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN 0146-6380
29-Character Source Abbreviation ORG GEOCHEM
ISO Source Abbreviation Org. Geochem.
Publication Date JUL
Year Published 2011
Volume 42
Issue 6
Beginning Page 618
Ending Page 629
Digital Object Identifier (DOI) 10.1016/j.orggeochem.2011.04.001
Page Count 12
Web of Science Category Geochemistry & Geophysics
Subject Category Geochemistry & Geophysics
Document Delivery Number 789FD
Unique Article Identifier WOS:000292498900005
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