Abstract:
Field measurements were used to determine the availability of peptide nitrogen to photosynthetic organisms and soil microbes. In order to fully understand their significance in the Maritime Antarctic nitrogen cycle it was also necessary to examine the ability of organisms to utilise the available peptides. For this reason, isotopically-labelled (15N and 13C) nitrogen compounds, including various peptides, were used to determine their rate of uptake by soil microorganisms and plants. These experiments were carried out on Signy to minimise any changes to organisms during transit.
Keywords:
N cycle, Signy Island, isotopic labelling, peptides, soil microbiota
| Access Constraints: | These data are currently managed by Dr Paul Hill at Bangor University. |
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| Use Constraints: | These data are governed by the NERC data policy. |
| Creation Date: | 2012-03-13 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Prof David Jones |
| Role(s) | Investigator |
| Organisation | University of Bangor |
| Name | Dr Kevin Newsham |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Prof John Farrar |
| Role(s) | Investigator |
| Organisation | University of Bangor |
| Name | Dr Paul Hill |
| Role(s) | Investigator, Technical Contact |
| Organisation | University of Bangor |
| Parent Dataset: | N/A |
| Reference: | Hill, PW; Farrell, M; Roberts, P ; Farrar, J; Grant, H; Newsham, KK; Hopkins, DW; Bardgett, RD; Jones DL, 2011. Soil- and enantiomer-specific metabolism of amino acids and their peptides by Antarctic soil microorganisms. SOIL BIOLOGY and BIOCHEMISTRY 43 2410-2416. Farrell, M; Hill, PW; Wanniarachchi, SD; Farrar, J; Bardgett, RD; Jones, DL, 2011. Rapid peptide metabolism: A major component of soil nitrogen cycling? GLOBAL BIOGEOCHEMICAL CYCLES 25 GB3014. Hill, PW; Farrar, J; Roberts, P; Farrell, M; Grant, H; Newsham, KK; Hopkins, DW; Bardgett, RD; Jones, DL, 2011. Vascular plant success in a warming Antarctic may be due to efficient nitrogen acquisition. NATURE CLIMATE 1 50-53. Jones, DL; Nguyen, C; Finlay, RD, 2009. Carbon flow in the rhizosphere: carbon trading at the soil-root interface. Plant and Soil 321 5-33. Project ref: AFI 08/08 - Challenging the paradigm for plant-microbial resource partitioning in Antarctic ecosystems |
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| Lineage: | Microbial uptake was determined by adding labelled solutions to freshly collected soil (n=3) at a rate of 0.35 ml to 0.24 g DW soil followed by centrifugal removal of solution after 30 min at about 7 °C. Microbial uptake was calculated as label in soils after subtraction of label retained abiotically in autoclaved controls. | |
| Temporal Coverage: | |
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| Start Date | 2008-12-16 |
| End Date | 2009-03-04 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -60.4 |
| Northernmost | -60.4 |
| Longitude | |
| Westernmost | -45.36 |
| Easternmost | -45.36 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Signy Island |
| Source(s): |
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| Data Collection: | See field report |
| Data Storage: | These data are managed by Dr Paul Hill at the University of Bangor |
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