Field soil respiration rate on a Sub-Antarctic island : its relation to site characteristics and response to added C, N and P

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dc.contributor.authorLubbe, Andrea
dc.contributor.authorSmith, Valdon R.
dc.date.accessioned2012-07-27T13:03:01Z
dc.date.issued2012-06
dc.descriptionThe original publication is available at http://www.scirp.org/journal/ojss/en_ZA
dc.descriptionPublication of this article was funded by the Stellenbosch University Open Access Fund.
dc.description.abstractBotanical, soil chemistry and soil microbiology variables were tested as predictors of in situ soil respiration rate in the various terrestrial habitats on sub-Antarctic Marion Island (47oS, 38oE). Inorganic P and total N concentration were the best predictors amongst the chemistry variables and bacteria plate count the best of the microbiology variables. However, while these chemistry and microbiology variables could accurately predict soil respiration rate for particular habitats, they proved inadequate predictors across the whole range of habitats. The best suite of predictors comprised only botanical variables (relative covers of five plant guilds) and accounted for 94% of the total across-habitat variation in soil respiration rate. Mean field soil respiration rates (2.1 - 15.5 mmol CO2 m-2 h-1) for habitats not influenced by seabirds or seals are similar to rates in comparable Northern Hemisphere tundra habitats. Seabird and seal manuring enhances soil respiration rates to values (up to 27.6 mmol CO2 m-2 h-1) higher than found at any tundra site. Glucose, N, P or N plus P were added to three habitats with contrasting soil types; a fellfield with mineral, nutrient-poor soil, a mire with organic, nutrient-poor soil and a shore-zone herbfield heavily manured by penguins and with organic, nutrient-rich soil. Glucose addition stimulated soil respiration in the fellfield and mire (especially the former) but not in the coastal herbfield soil. N and P, alone or together, did not stimulate respiration at any of the habitats, but adding glucose to fellfield soils that had previously been fortified with P or NP caused a similar increase in respiration rate, which was greater than the increase when adding glucose to soils fortified only with N. This suggests that fellfield soil respiration is limited by P rather than N, and that there is no synergism between the two nutrients. For the mire and coastal herbfield, adding glucose to soils previously fortified with N, P or NP did not enhance rates more than adding glucose to soils that had received no nutrient pre-treatment.en_ZA
dc.description.versionPublishers' Versionen_ZA
dc.embargo.lift2050-12-31
dc.embargo.terms2050-12-31en_ZA
dc.format.extentp. 187-195, ill.en_ZA
dc.identifier.citationLubbe, A. & Smith, V. 2012. Field Soil Respiration Rate on a Sub-Antarctic Island: Its Relation to Site Characteristics and Response to Added C, N and P. Open Journal of Soil Science, 2(2), 187-195, doi: 10.4236/ojss.2012.22023.en_ZA
dc.identifier.issn2162-5379 (online)
dc.identifier.issn2162-5360 (print)
dc.identifier.otherdoi: 10.4236/ojss.2012.22023
dc.identifier.urihttp://hdl.handle.net/10019.1/21876
dc.language.isoen_ZAen_ZA
dc.publisherScientific Research Publishing Incen_ZA
dc.rights.holderScientific Research Publishingen_ZA
dc.subjectSoil respirationen_ZA
dc.subjectSub-Antarctic islanden_ZA
dc.subjectSoil moisture contenten_ZA
dc.subjectSoil nutrient statusen_ZA
dc.subjectSeal and seabird manuringen_ZA
dc.titleField soil respiration rate on a Sub-Antarctic island : its relation to site characteristics and response to added C, N and Pen_ZA
dc.typeArticleen_ZA
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