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Salinity and sodicity effects on respiration and microbial biomass of soil

Wong, Vanessa; Dalal, Ram; Greene, Richard

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An understanding of the effects of salinity and sodicity on soil carbon (C) stocks and fluxes is critical in environmental management, as the areal extents of salinity and sodicity are predicted to increase. The effects of salinity and sodicity on the soil microbial biomass (SMB) and soil respiration were assessed over 12weeks under controlled conditions by subjecting disturbed soil samples from a vegetated soil profile to leaching with one of six salt solutions; a combination of low-salinity...[Show more]

dc.contributor.authorWong, Vanessa
dc.contributor.authorDalal, Ram
dc.contributor.authorGreene, Richard
dc.date.accessioned2015-12-10T22:21:54Z
dc.identifier.issn0178-2762
dc.identifier.urihttp://hdl.handle.net/1885/52418
dc.description.abstractAn understanding of the effects of salinity and sodicity on soil carbon (C) stocks and fluxes is critical in environmental management, as the areal extents of salinity and sodicity are predicted to increase. The effects of salinity and sodicity on the soil microbial biomass (SMB) and soil respiration were assessed over 12weeks under controlled conditions by subjecting disturbed soil samples from a vegetated soil profile to leaching with one of six salt solutions; a combination of low-salinity (0.5dSm-1), mid-salinity (10dSm -1), or high-salinity (30dSm-1), with either low-sodicity (sodium adsorption ratio, SAR, 1), or high-sodicity (SAR 30) to give six treatments: control (low-salinity low-sodicity); low-salinity high-sodicity; mid-salinity low-sodicity; mid-salinity high-sodicity; high-salinity low-sodicity; and high-salinity high-sodicity. Soil respiration rate was highest (56-80mg CO2-C kg-1 soil) in the low-salinity treatments and lowest (1-5mg CO2-C kg-1 soil) in the mid-salinity treatments, while the SMB was highest in the high-salinity treatments (459-565mg kg-1 soil) and lowest in the low-salinity treatments (158-172mg kg-1 soil). This was attributed to increased substrate availability with high salt concentrations through either increased dispersion of soil aggregates or dissolution or hydrolysis of soil organic matter, which may offset some of the stresses placed on the microbial population from high salt concentrations. The apparent disparity in trends in respiration and the SMB may be due to an induced shift in the microbial population, from one dominated by more active microorganisms to one dominated by less active microorganisms.
dc.publisherSpringer
dc.sourceBiology and Fertility of Soils
dc.subjectKeywords: biomass; environmental management; environmental stress; population dynamics; respiration; salinity; sodicity; soil microorganism; soil profile; soil respiration Labile carbon; Leaching; Microbial biomass; Saline; Sodic; Soil respiration
dc.titleSalinity and sodicity effects on respiration and microbial biomass of soil
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume44
dc.date.issued2008
local.identifier.absfor050304 - Soil Chemistry (excl. Carbon Sequestration Science)
local.identifier.ariespublicationU4279067xPUB246
local.type.statusPublished Version
local.contributor.affiliationWong, Vanessa, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationDalal, Ram, CRC for Greenhouse Accounting
local.contributor.affiliationGreene, Richard, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage943
local.bibliographicCitation.lastpage953
local.identifier.doi10.1007/s00374-008-0279-1
dc.date.updated2015-12-09T08:58:43Z
local.identifier.scopusID2-s2.0-47549101248
local.identifier.thomsonID000257713800005
CollectionsANU Research Publications

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