Abstract:
To identify and quantify soil N species over a full growth season, small volumes of soil were removed from each sampling site 5 times during the field season and extracted in the laboratory. Bare soil at higher elevations, namely Observation Bluff, Factory Bluffs, Jane Col and lower parts of Spindrift Col; Soils from below mosses on the Backslope and on Moss Braes. Soils from below higher plant species at Bernsten Point, Factory Bluffs, Moss Braes and North Point. Orthinogenic soils from around penguin colonies at Gourlay Peninsula, Spindrift Rocks and North Point and disturbed soil from around Signy Base were collected. At the same time, soil pore water was extracted using Rhizon soil water samplers.
DON (Dissolved organic Nitrogen) and Microbial biomass measurements were made by standard CHCl3 fumigation-extraction techniques. Turnover of DON in the soil was determined by the addition of 14C-labelled plant protein (purified from 14C-labelled algal cells) or 14C-labelled glucose to the soil at a range of concentrations, and their turnover (soil label depletion in combination with NH4 +, NO3-and 14CO2 production) was determined. Gross rates of N mineralization and nitrification were determined using 15N isotope dilution methodology. Laboratory analysis of N speciation and quantification, 14C uptake and respiration, 13C PLFA signatures and 15N analysis was done. Amino acid turnover times have been determined using 14C labelled amino acids. For the final stage of the project a mathematical model to describe plant-soil-microbial N fluxes in Antarctic soils was constructed.
Keywords:
Nitrogen cycle, Signy Island, bare soil, mosses, orthinogenic soil, soil chemical composition, soil pore water
| Access Constraints: | Requests for data can be made via the UK Polar Data Centre (UK PDC) at BAS. |
|---|---|
| Use Constraints: | Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ |
| Creation Date: | 2012-02-29 |
|---|---|
| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
|
| Parameters: |
|
| 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 Paula Roberts |
| Role(s) | Investigator, Technical Contact |
| Organisation | University of Bangor |
| Parent Dataset: | N/A |
| Reference: | Boddy, E; Roberts, P; Hill, PW, Roberts, P, Farrar JF, Jones DL, 2008. Turnover of low molecular weight dissolved organic C (DOC) and microbial C exhibit different temperature sensitivities in Arctic tundra soils. Soil Biology and Biochemistry 40 1557-1566. Roberts P and Jones DL, 2008. Critical evaluation of methods for determining total protein in soil solution. Soil Biology and Biochemistry 40 1485-1495. Roberts, P; Newsham, KK; Bardgett, RD, Jones DL, 2009. Vegetation cover regulates the quantity, quality and temporal dynamics of dissolved organic carbon and nitrogen in Antarctic soils. POLAR BIOLOGY 32 999-1008. Jones, DL; Kielland, K; Sinclair, FL, et al., 2009. Soil organic nitrogen mineralization across a global latitudinal gradient. GLOBAL BIOGEOCHEMICAL CYCLES 23 GB1016. 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 reference: AFI 05/32 - Dissolved organic nitrogen cycling in the Antarctic |
|
|---|---|---|
| Lineage: | ||
| Project: |
|
|
| Temporal Coverage: | |
|---|---|
| Start Date | 2005-07-28 |
| End Date | 2008-01-27 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -60.725 |
| Northernmost | -60.683 |
| Longitude | |
| Westernmost | -45.628 |
| Easternmost | -45.583 |
| Altitude | |
| Min Altitude | ~0m |
| Max Altitude | ~300m |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Signy Island |
| Sensor(s): |
|
|---|---|
| Source(s): |
|
| Distribution: | |
|---|---|
| Distribution Media | N/A |
| Distribution Size | 200MB |
| Distribution Format | N/A |
| Fees | See Natural Environment Research Council (NERC) Data Policy |
| Distribution Media | N/A |
| Distribution Size | ~300 vials of soil extracts |
| Distribution Format | N/A |
| Fees | See Natural Environment Research Council (NERC) Data Policy |
| Data Storage: | These data are managed by Bangor University. |