[Parameters: Topic='BIOSPHERE', Term='ECOLOGICAL DYNAMICS', Variable_Level_1='ECOSYSTEM FUNCTIONS', Variable_Level_2='PHOTOSYNTHESIS']
Natural spatial subsidies in continental Antarctic soilEntry ID: K052_2001_2005_NZ_1
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Abstract: The soils of the McMurdo Dry Valleys are hypothesized to rely on external sources of nutrients (carbon, nitrogen, etc). The importance of these spatial subsidies on productivity and biological diversity of dry valley soils was investigated over several seasons in the Garwood Valley. Sampling of the soil, microbial mats and foam from each identified landform and from Lake Colleen was undertaken for ... analysis of a variety of soil biological and chemical properties in order to gain an idea of the general spatial variation of these properties (before experimental work) and to determine the size of the soil microbial communities, the rates of microbial respiration and the abundance of selected invertebrate groups. Soil samples were collected and analysed to quantify carbon and nitrogen pools, potential decomposition and nitrogen release under optimal conditions and potential microbial use of a variety of test C and N substrates. The importance of spatial subsidy materials on the four different landforms was tested with the addition of lakeshore foam and algal mats at two levels of application, plus appropriate treatment controls. Pre-treatment soil samples were taken for a variety of chemical analysis to establish baseline parameters. After subsidy applications, field measurements were made of the short -term changes (over the first six days after treatment application) in in-situ microbial activity and the composition of gases being released into the atmosphere. After six days, a second set of soil samples were collected for post treatment measurements of soil community composition and diversity, potential microbial activity and decomposer processes. Soil samples were again taken 2 years later for medium term respiratory processes but also for laboratory controlled replicate experiment for in-situ confirmation of initial nitrogen limitation and later carbon limitation. Studies were in the 01/02, 02/03 and 04/05 seasons in the Garwood Valley.
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