Ecophysiology of salt- and waterlogging tolerance in selected species of Halosarcia

Jeremy English

Research output: ThesisDoctoral Thesis

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Abstract

Factors contributing to the zonation of Halosarcia (Chenopodiaceae) species on the margins of an ephemeral salt lake in the semi-arid zone of Western Australia were investigated. Germination and survival of seedlings, tissue solute concentrations, and soil properties were monitored for 30 months at Hannan Lake. Soil conditions and germination were also monitored on a highly saline mine rehabilitation site near Hannan Lake. Additionally, glasshouse experiments were conducted to investigate various aspects of the salinity- and waterlogging-tolerance of selected species of Halosarcia. At Hannan Lake, H. indica subsp. bidens (henceforth H. indica) occurred on low dunes bordering the lake playa, H. doleiformis occurred in the dunes and on the foreslope of the first dune bordering the playa, and H. pergranulata subsp. pergranulata (henceforth H. pergranulata) occurred in the dunes and on the playa. Soil salinity was generally higher on the lake playa compared with the dunes, and at times the playa was submerged (for up to 10 months). Germination of Halosarcia at Hannan Lake occurred on soil exposed as lake water receded during spring. Mortality of seedlings coincided with periods of declining soil water content and increasing soil water salinity, but also with periods of submergence. Once established, H. pergranulata were relatively tolerant of submergence, for example 17 month-old seedlings survived 9 months submergence. At the mine rehabilitation site, H. pergranulata and H. doleiformis were applied as part of a halophytic seed mix. Germination of Halosarcia only occurred when waste-water of low salinity was pumped onto the site. Successful germination and establishment of other halophytic species, initiated by rainfall alone, indicates the site may be more suited to species adapted to drier conditions than H. pergranulata and H. doleiformis.
Original languageEnglish
QualificationDoctor of Philosophy
Publication statusUnpublished - 2004

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ecophysiology
flooded conditions
playas
salts
lakes
dunes
submergence
germination
seedlings
salinity
Bidens
Amaranthaceae
semiarid zones
soil salinity
water salinity
Western Australia
solutes
wastewater
soil water content
soil quality

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title = "Ecophysiology of salt- and waterlogging tolerance in selected species of Halosarcia",
abstract = "Factors contributing to the zonation of Halosarcia (Chenopodiaceae) species on the margins of an ephemeral salt lake in the semi-arid zone of Western Australia were investigated. Germination and survival of seedlings, tissue solute concentrations, and soil properties were monitored for 30 months at Hannan Lake. Soil conditions and germination were also monitored on a highly saline mine rehabilitation site near Hannan Lake. Additionally, glasshouse experiments were conducted to investigate various aspects of the salinity- and waterlogging-tolerance of selected species of Halosarcia. At Hannan Lake, H. indica subsp. bidens (henceforth H. indica) occurred on low dunes bordering the lake playa, H. doleiformis occurred in the dunes and on the foreslope of the first dune bordering the playa, and H. pergranulata subsp. pergranulata (henceforth H. pergranulata) occurred in the dunes and on the playa. Soil salinity was generally higher on the lake playa compared with the dunes, and at times the playa was submerged (for up to 10 months). Germination of Halosarcia at Hannan Lake occurred on soil exposed as lake water receded during spring. Mortality of seedlings coincided with periods of declining soil water content and increasing soil water salinity, but also with periods of submergence. Once established, H. pergranulata were relatively tolerant of submergence, for example 17 month-old seedlings survived 9 months submergence. At the mine rehabilitation site, H. pergranulata and H. doleiformis were applied as part of a halophytic seed mix. Germination of Halosarcia only occurred when waste-water of low salinity was pumped onto the site. Successful germination and establishment of other halophytic species, initiated by rainfall alone, indicates the site may be more suited to species adapted to drier conditions than H. pergranulata and H. doleiformis.",
keywords = "Chenopodiaceae, Ecophysiology, Western Australia, Hannan Lake, Effect of salt on, Effect of water levels on, Halophytes",
author = "Jeremy English",
year = "2004",
language = "English",

}

Ecophysiology of salt- and waterlogging tolerance in selected species of Halosarcia. / English, Jeremy.

2004.

Research output: ThesisDoctoral Thesis

TY - THES

T1 - Ecophysiology of salt- and waterlogging tolerance in selected species of Halosarcia

AU - English, Jeremy

PY - 2004

Y1 - 2004

N2 - Factors contributing to the zonation of Halosarcia (Chenopodiaceae) species on the margins of an ephemeral salt lake in the semi-arid zone of Western Australia were investigated. Germination and survival of seedlings, tissue solute concentrations, and soil properties were monitored for 30 months at Hannan Lake. Soil conditions and germination were also monitored on a highly saline mine rehabilitation site near Hannan Lake. Additionally, glasshouse experiments were conducted to investigate various aspects of the salinity- and waterlogging-tolerance of selected species of Halosarcia. At Hannan Lake, H. indica subsp. bidens (henceforth H. indica) occurred on low dunes bordering the lake playa, H. doleiformis occurred in the dunes and on the foreslope of the first dune bordering the playa, and H. pergranulata subsp. pergranulata (henceforth H. pergranulata) occurred in the dunes and on the playa. Soil salinity was generally higher on the lake playa compared with the dunes, and at times the playa was submerged (for up to 10 months). Germination of Halosarcia at Hannan Lake occurred on soil exposed as lake water receded during spring. Mortality of seedlings coincided with periods of declining soil water content and increasing soil water salinity, but also with periods of submergence. Once established, H. pergranulata were relatively tolerant of submergence, for example 17 month-old seedlings survived 9 months submergence. At the mine rehabilitation site, H. pergranulata and H. doleiformis were applied as part of a halophytic seed mix. Germination of Halosarcia only occurred when waste-water of low salinity was pumped onto the site. Successful germination and establishment of other halophytic species, initiated by rainfall alone, indicates the site may be more suited to species adapted to drier conditions than H. pergranulata and H. doleiformis.

AB - Factors contributing to the zonation of Halosarcia (Chenopodiaceae) species on the margins of an ephemeral salt lake in the semi-arid zone of Western Australia were investigated. Germination and survival of seedlings, tissue solute concentrations, and soil properties were monitored for 30 months at Hannan Lake. Soil conditions and germination were also monitored on a highly saline mine rehabilitation site near Hannan Lake. Additionally, glasshouse experiments were conducted to investigate various aspects of the salinity- and waterlogging-tolerance of selected species of Halosarcia. At Hannan Lake, H. indica subsp. bidens (henceforth H. indica) occurred on low dunes bordering the lake playa, H. doleiformis occurred in the dunes and on the foreslope of the first dune bordering the playa, and H. pergranulata subsp. pergranulata (henceforth H. pergranulata) occurred in the dunes and on the playa. Soil salinity was generally higher on the lake playa compared with the dunes, and at times the playa was submerged (for up to 10 months). Germination of Halosarcia at Hannan Lake occurred on soil exposed as lake water receded during spring. Mortality of seedlings coincided with periods of declining soil water content and increasing soil water salinity, but also with periods of submergence. Once established, H. pergranulata were relatively tolerant of submergence, for example 17 month-old seedlings survived 9 months submergence. At the mine rehabilitation site, H. pergranulata and H. doleiformis were applied as part of a halophytic seed mix. Germination of Halosarcia only occurred when waste-water of low salinity was pumped onto the site. Successful germination and establishment of other halophytic species, initiated by rainfall alone, indicates the site may be more suited to species adapted to drier conditions than H. pergranulata and H. doleiformis.

KW - Chenopodiaceae

KW - Ecophysiology

KW - Western Australia

KW - Hannan Lake

KW - Effect of salt on

KW - Effect of water levels on

KW - Halophytes

M3 - Doctoral Thesis

ER -