[Location: Location_Category='CONTINENT', Location_Type='ANTARCTICA', Detailed_Location='WRIGHT VALLEY']
The legacy model vs the subsidy model to explain soil organic matter in the McMurdo Dry ValleysEntry ID: K052_2004_2006_NZ_1
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Abstract: The Dry Valleys of Victoria Land, Antarctica, contain naturally simple ecosystems operating under extreme climatic conditions. Nutrients are limited and are thought to come from external sources from more productive parts of the landscape or from other ecosystems entirely, such as the lakes occurring in the valleys. A ?legacy? model suggests the origin of present day soil organic matter to be ... material laid down in ancient lake beds rather than aeolian dispersal from modern aquatic environments, as previously thought. This does not appear to hold true for smaller dry valleys and instead a ?subsidy? model was investigated by testing several hypotheses with a combination of: a survey of the physical and biological characteristics of the eight key landscape elements identified in the valley, experimentally measuring the benefit of wind-blown subsidies to terrestrial microbial populations and the nature of the beneficial component of the subsidies. In each of the landscapes, the soil respiration, terrestrial photosynthesis (moss colonies and cyanobacterial mats on the soil), terrestrial nitrogen fixation, approximate area covered by communities undertaking carbon and nitrogen fixation and the transfer of organic material between aquatic and terrestrial environments was quantified. The results of these measurements will be a carbon and nitrogen budget for terrestrial communities in the valley system. The parameters and landscape scale resource budgets were tested by comparing the conditions in the Garwood Valley with those in the western Wright Valley, which is characterised by an entirely internal drainage system (the Onyx River flowing into Lake Vanda), a much less productive lake that occupies a much smaller areal proportion of the total valley floor, and a climate more influenced by the extremes of arid katabatic winds. Studies were in the 04/05 and 05/06 seasons in the Garwood Valley (Lake Colleen and Buddha Lake) and the Wright Valley (Lake Vanda).
Start Date: 2005-01-22Stop Date: 2005-01-28
Start Date: 2006-01-10Stop Date: 2006-01-21
AGRICULTURE > SOILS > CARBON
AGRICULTURE > SOILS > DENITRIFICATION RATE
AGRICULTURE > SOILS > NITROGEN
AGRICULTURE > SOILS > ORGANIC MATTER
AGRICULTURE > SOILS > SOIL FERTILITY
AGRICULTURE > SOILS > SOIL GAS/AIR
AGRICULTURE > SOILS > SOIL MOISTURE/WATER CONTENT
AGRICULTURE > SOILS > SOIL RESPIRATION
AGRICULTURE > SOILS > SOIL TEMPERATURE
AGRICULTURE > SOILS > MICROFLORA
BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > BIODIVERSITY FUNCTIONS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOGEOCHEMICAL CYCLES
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > NUTRIENT CYCLING
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > DECOMPOSITION
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > RESPIRATION RATE
BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > COMMUNITY STRUCTURE
Quality This is an ongoing investigation. The soil samples are held at the Scottish Crop Research Institute, Dundee, Scotland. Please contact Professor David Hopkins for more details. The data is archived with Associate Professor Ashley Sparrow, Professor David Hopkins and Dr Ed Gregorich. Please contact them for more information or please refer to the publications.
Data Set Progress
Phone: +01 775 784 1107
Fax: +01 775 784 4583
Email: asparrow at cabnr.unr.edu
Natural Resources and Environmental Science University of Nevada, Reno Mail Stop 186 1000 Valley Road
Province or State: Nevada
Postal Code: 89512
Hopkins D.W., Sparrow, A.D., Gregorich, E.G., Elberling, B., Novis, P., Fraser, F., Scrimgeour, C., Dennis, P.G.. Meier-Augenstein W. & Greenfield, L.G. 2009. Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys. Environmental Microbiology, doi:10.1111/j.1462-2920.2008.01830.x
Hopkins, D.W., Sparrow, A.D., Shillam, L.L., English, L.C., Dennis, P.G., Novis, P., Elberling, B., Gregorich, E.G. & Greenfield, L.G. 2008. Enzymatic activities and microbial communities in an Antarctic dry valley soil: Responses to C and N supplementation. Soil Biology and Biochemistry, 40: 2130-2136.
Hopkins, D.W., Sparrow, A.D., Gregorich, E.G., Novis, P., Elberling, B. & Greenfield, L.G. 2008. Redistributed lacustrine detritus as a spatial subsidy of biological resources for soils in an Antarctic dry valley. Geoderma, 144: 86-92.
Novis, P.M., Whitehead, D., Gregorich, E.G., Hunt, J.E., Sparrow, A.D., Hopkins, D.W., Elberling, B., & Greenfield, L.G. 2007. Annual carbon fixation in terrestrial populations of Nostoc commune (Cyanobacteria) from an Antarctic dry valley is driven by temperature regime. Global Change Biology 13: 1224-1237.
Hopkins, D.W., Sparrow, A.D., Novis, P.M., Gregorich, E.G., Elberling, B. & Greenfield, L.G. 2006. Controls on the distribution of productivity and organic resources in Antarctic dry valley soils. Proceedings of the Royal Society Series B: Biological Sciences 273: 2687-2695. [Invited review]
Elberling, B., Gregorich, E.G., Hopkins, D.W., Sparrow, A.D., Novis, P., & Greenfield, L.G. 2006. Distribution and dynamics of soil organic matter in an Antarctic dry valley. Soil Biology and Biochemistry 38: 3095-3106.
Gregorich, E.G., Hopkins, D.W., Elberling, B., Novis, P., Sparrow, A.D., Greenfield, L.G. & Rochette, P. 2006. Biogenic gas emission from lakeshore soils in an Antarctic dry valley. Soil Biology and Biochemistry 38: 3120-3129.
Hopkins, D.W., Sparrow, A.D., Elberling, B., Gregorich, E.G., Novis, P., Greenfield, L.G., & Tilston, E.L.. 2006. Carbon, nitrogen and temperature controls on microbial activity in soils from an Antarctic dry valley. Soil Biology and Biochemistry 38: 3130-3140.
Hopkins, D.W., Elberling, B., Greenfield, L.G., Gregorich, E.G., Novis, P., O?Donnell, A.G. & Sparrow, A.D. 2005. Soil micro-organisms in Antarctic dry valleys: resource supply and utilization. In: G.M. Gadd, K.T. Semple & H.M. Lappin-Scott (eds). SGM Symposium 65: Micro-organisms and Earth Systems ? Advances in Geomicrobiology. Cambridge University Press, Cambridge. pp.71-84.
Hopkins, D., Sparrow, A., et al. 2008. Biogeochemical transformations and responses to change of soils organisms in Antarctic dry valleys. Joint Scientific Committee on Antarctic Research (SCAR)/International Arctic Science Committee (IASC) International Polar Year Conference, St Petersburg, Russia, 8-11 July, 2008.
Novis, P., Smissen, R., Sparrow, A., Whitehead, D., Hunt, J., Gregorich, E., Hopkins, D., Elberling, B., Broady, P., & Greenfield, L. 2007. Nostoc commune in Victoria Land. Antarctica New Zealand Latitudinal Gradient Workshop, Wellington, NZ, 2 July 2007.
Elberling, B., Gregorich E.G., Hopkins D.W., Sparrow A.D., Novis P. & Greenfield L.G. 2007. Controls on soil organic matter decomposition in an Antarctic dry valley. International Symposium on Soil Processes Under Extreme Meteorological Conditions. Bayreuth, Germany, 25-28 February 2007.
Hopkins, D.W., Sparrow, A.D., Gregorich, E.G., Elberling, B., Greenfield, L.G. & Novis, P. 2006. Controls on biological activity in soils from Antarctic dry valleys. 18th World Congress of Soil Science. Philadelphia, USA, 9-16 July 2006.
Sparrow, A., Elberling, B., Greenfield, L., Gregorich, E., Hopkins, D., Novis, P. & Wardle, D. 2005. Antarctic dry valley soil organic matter and microbial communities: within-valley heterogeneity of composition and function. Ecological Society of America Annual Conference, Montreal, 8-12 August, 2005.
Hopkins, D., Greenfield, L., Wardle, D., Novis, P., Sparrow, A., Gregorich, E., Elberling, B., O?Donnell,T., & English, L. 2005. Resources and diversity. Synthesis of Soil Biodiversity and Ecosystem Functioning in Victoria Land, Antarctica: An NSF-Sponsored Workshop. Jekyll Island, USA, 21-23 April, 2005.
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Creation and Review Dates
DIF Creation Date: 2009-04-16
Last DIF Revision Date: 2017-08-24