Salinity limits of vegetation in Cienega de Santa Clara, an oligotrophic marsh in the delta of the Colorado River, Mexico

Implications for an increase in salinity

Kimberly Baeza, Laura López-Hoffman, Edward P. Glenn, Karl Flessa, Jaqueline Garcia-Hernandez

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Greenhouse and field trials were conducted to determine the salinity limits for main vegetation types in Cienega de Santa Clara, an oligohaline marsh in the delta of the Colorado River in Mexico. The Cienega is the largest brackish marsh in the Sonoran Desert and supports numerous bird, mammal and invertebrate species, including threatened or endangered marsh birds. It is supported by brackish agricultural return flows from the USA and Mexico, and operation of the Yuma Desalting Plant (YDP) could reduce the volume and increase the salinity of inflows. Current inflows average 4m3s-1 at 2.8gL-1 Total Dissolved Solids (TDS), and the dominant vegetation type is Typha domingensis, with subdominant stands of Schoenoplectus americanus and other emergent species distributed amidst the Typha stands. A greenhouse experiment showed that under flooded-soil conditions, T. domingensis had a linear reduction in relative growth rate based on biomass production (RGRBiomass) with salinity, with zero RGRBiomass at 8.3gL-1 TDS and a 50% reduction at 4.0gL-1 TDS. S. americanus was about twice as salt-tolerant, with zero RGRBiomass at 12.5gL-1 TDS and 50% RGRBiomass at 9gL-1 TDS. The results are consistent with other studies that show a mean reduction in RGRBiomass of 13.3% per g L-1 TDS for Typha spp. and 4.3% per g L-1 TDS for Schoenoplectus spp. Field surveys showed that T. domingensis stands were restricted to salinities of 6.5gL-1 TDS or less, and that annual biomass production was reduced by 85% in a stand at 5.9gL-1 TDS compared to a stand at 3.0gL-1 TDS. Normalized Difference Vegetation Index (NDVI) values of T. domingensis stands from satellite imagery showed a linear decline with increasing salinity in the marsh. It was concluded that 6gL-1 TDS is the approximate upper limit for vigorous stands of T. domingensis, and that replacement by S. americanus is a possibility if salinities increase. Implications for marsh vegetation structure and habitat value are discussed under different possible operating scenarios for the YDP.

Original languageEnglish (US)
Pages (from-to)157-166
Number of pages10
JournalEcological Engineering
Volume59
DOIs
StatePublished - Sep 2012

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marsh
Rivers
salinity
vegetation
river
Biomass
biomass
Salt removal
Greenhouses
Birds
vegetation type
inflow
bird
flooded soil
Mammals
Satellite imagery
vegetation structure
NDVI
satellite imagery
field survey

Keywords

  • California black rail
  • Constructed wetland
  • Salinity tolerance
  • Schoenoplectus
  • Typha
  • Yuma clapper rail

ASJC Scopus subject areas

  • Environmental Engineering
  • Management, Monitoring, Policy and Law
  • Nature and Landscape Conservation

Cite this

Salinity limits of vegetation in Cienega de Santa Clara, an oligotrophic marsh in the delta of the Colorado River, Mexico : Implications for an increase in salinity. / Baeza, Kimberly; López-Hoffman, Laura; Glenn, Edward P.; Flessa, Karl; Garcia-Hernandez, Jaqueline.

In: Ecological Engineering, Vol. 59, 09.2012, p. 157-166.

Research output: Contribution to journalArticle

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abstract = "Greenhouse and field trials were conducted to determine the salinity limits for main vegetation types in Cienega de Santa Clara, an oligohaline marsh in the delta of the Colorado River in Mexico. The Cienega is the largest brackish marsh in the Sonoran Desert and supports numerous bird, mammal and invertebrate species, including threatened or endangered marsh birds. It is supported by brackish agricultural return flows from the USA and Mexico, and operation of the Yuma Desalting Plant (YDP) could reduce the volume and increase the salinity of inflows. Current inflows average 4m3s-1 at 2.8gL-1 Total Dissolved Solids (TDS), and the dominant vegetation type is Typha domingensis, with subdominant stands of Schoenoplectus americanus and other emergent species distributed amidst the Typha stands. A greenhouse experiment showed that under flooded-soil conditions, T. domingensis had a linear reduction in relative growth rate based on biomass production (RGRBiomass) with salinity, with zero RGRBiomass at 8.3gL-1 TDS and a 50{\%} reduction at 4.0gL-1 TDS. S. americanus was about twice as salt-tolerant, with zero RGRBiomass at 12.5gL-1 TDS and 50{\%} RGRBiomass at 9gL-1 TDS. The results are consistent with other studies that show a mean reduction in RGRBiomass of 13.3{\%} per g L-1 TDS for Typha spp. and 4.3{\%} per g L-1 TDS for Schoenoplectus spp. Field surveys showed that T. domingensis stands were restricted to salinities of 6.5gL-1 TDS or less, and that annual biomass production was reduced by 85{\%} in a stand at 5.9gL-1 TDS compared to a stand at 3.0gL-1 TDS. Normalized Difference Vegetation Index (NDVI) values of T. domingensis stands from satellite imagery showed a linear decline with increasing salinity in the marsh. It was concluded that 6gL-1 TDS is the approximate upper limit for vigorous stands of T. domingensis, and that replacement by S. americanus is a possibility if salinities increase. Implications for marsh vegetation structure and habitat value are discussed under different possible operating scenarios for the YDP.",
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