Biogeochemical responses to nutrient, moisture and temperature manipulations of soil from Signy Island, South Orkney Islands in the Maritime Antarctic

Sun, Benhua, Dennis, P. G., Laudicina, V. A., Ord, V. J., Rushton, S. P., O'Donnell, A. G., Newsham, K. K. and Hopkins, D. W. (2014) Biogeochemical responses to nutrient, moisture and temperature manipulations of soil from Signy Island, South Orkney Islands in the Maritime Antarctic. Antarctic Science, 26 5: 513-520. doi:10.1017/S0954102014000030


Author Sun, Benhua
Dennis, P. G.
Laudicina, V. A.
Ord, V. J.
Rushton, S. P.
O'Donnell, A. G.
Newsham, K. K.
Hopkins, D. W.
Title Biogeochemical responses to nutrient, moisture and temperature manipulations of soil from Signy Island, South Orkney Islands in the Maritime Antarctic
Journal name Antarctic Science   Check publisher's open access policy
ISSN 1365-2079
0954-1020
Publication date 2014-10
Year available 2014
Sub-type Article (original research)
DOI 10.1017/S0954102014000030
Open Access Status
Volume 26
Issue 5
Start page 513
End page 520
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Collection year 2015
Language eng
Abstract We have investigated how the microbially-driven processes of carbon (C) mineralization (respiration) and nitrogen (N) mineralization/immobilization in a soil from the northern Maritime Antarctic respond to differences in water availability (20% and 80% water-holding capacity) and temperature (5°C and 15°C) in the presence and absence of different organic substrates (2 mg C as either glucose, glycine or tryptone soy broth (TSB) powder (a complex microbial growth medium)) in a controlled laboratory experiment over 175 days. Soil respiration and N mineralization/immobilization in the presence of a C-rich substrate (glucose) increased with increases in water and temperature. These factors were influential individually and had an additive effect when applied together. For the N-rich substrates (glycine and TSB), microbial responses to increased water or temperature alone were weak or not significant, but these factors interacted to give significantly positive increases when applied together. These data indicate that under the expected changes in environmental conditions in the Maritime Antarctic, where temperature and the availability of water and organic substrates will probably increase, soil microbial activity will lead to more rapid C and N cycling and have a positive feedback on these biogeochemical processes, particularly where or when these factors increase concurrently.
Keyword Carbon mineralization
Nitrogen mineralization
Organic substrates
Soil respiration
Warming
Water addition
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Advanced Water Management Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 14 Dec 2014, 01:32:18 EST by System User on behalf of Advanced Water Management Centre