Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11179
Title: Soil properties on sub-Antarctic Macquarie Island: fundamental indicators of ecosystem function and potential change
Authors: Wilson, BR
Wilson, SC
Sindel, B
Williams, LK
Hawking, KL
Shaw, J
Tighe, M
Hua, Q
Kristiansen, P
Keywords: Birds
Soils
Nutrients
Isotopes
Ecosystems
Carbon 14
Issue Date: Jun-2019
Publisher: Elsevier
Citation: Wilson, B. R., Wilson, S. C., Sindel, B., Williams, L. K., Hawking, K. L., Shaw, J., Tighe, M., Hua, Q. & Kristiansen, P. (2019). Soil properties on sub-Antarctic Macquarie Island: fundamental indicators of ecosystem function and potential change. Catena, 177, 167-179. doi:10.1016/j.catena.2019.02.007
Abstract: We examined the nature and properties of soils on Australian sub-Antarctic Macquarie Island to determine key environmental factors driving their distribution, development and change. We provide the first classification of these soils using Australian and international (WRB) systems while combining elemental, stable and radio-isotope analysis to interpret processes of soil formation and key controlling environmental factors. Soil organic carbon (SOC) and total nitrogen (TN) concentrations across the island were influenced largely by elevation and topographic position with coastal soils and wetter depressions containing more SOC and TN compared with drier and higher elevation locations. Soils on the high, exposed plateau of the island contained low SOC and TN concentrations by comparison. Results suggested that soils of the coastal zone are subject to ongoing aggradation with significant inputs of nutrient, particularly extractable P (Ext P), from oceanic and especially avifauna sources. Nutrient subsidy was concentrated on coastal margins and the more sheltered eastern side of the island, diminishing significantly with increasing elevation and distance from the coast. Soils of the central plateau contained very low Ext P concentrations throughout the profile and appear to be relic if not degrading. Further comprehensive soil mapping, classification and monitoring across Macquarie Island will elucidate the important role that soils serve for healthy ecosystem function in these sub-Antarctic environments and provide early warning indicators of significant environmental change. © 2019 Elsevier B.V.
URI: https://doi.org/10.1016/j.catena.2019.02.007
https://apo.ansto.gov.au/dspace/handle/10238/11179
ISSN: 0341-8162
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.