Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/24198

Pre-mining pattern of soils on Nauru, Central Pacific

File Size Format  
PacSci_523-540.pdf 167.14 kB Adobe PDF View/Open

Item Summary

dc.contributor.author Morrison, R.J.
dc.contributor.author Manner, Harley I.
dc.date.accessioned 2012-09-24T19:23:56Z
dc.date.available 2012-09-24T19:23:56Z
dc.date.issued 2005-10
dc.identifier.citation Morrison RJ, Manner HI. Pre-mining pattern of soils on Nauru, Central Pacific. Pac Sci 59(4): 523-540.
dc.identifier.issn 0030-8870
dc.identifier.uri http://hdl.handle.net/10125/24198
dc.description.abstract The environment of Nauru, a raised atoll located in the central Pacific Ocean (0° 32' S, 166° 56' W), was devastated by mining of phosphate "rock" during the twentieth century. Some 100 million tonnes of phosphate material has been removed, leaving more than 80% of the island as a dolomite pinnacle-dominated karrenfeld. Based on fieldwork examining sites unmined at that time, laboratory studies on undisturbed profiles, aerial photographs, and old mining maps, a picture of what the soil pattern on Nauru was before mining has been developed. Four major soil associations were identified: the coastal fringe carbonate-dominated soils set on a recent fringing reef; deep and relatively deep phosphate-dominated soils free of substantial influence from the underlying dolomite pinnacles occurring on the NE, NW, SE, and SW sectors of the uplifted section of the island (known locally as "Topside"); a complex set of soils found on Topside and on the scarp where the pinnacle influence is important but containing some deep soils where phosphate material accumulated between the pinnacles; and a complex set of soils in low-lying areas around the old lagoon at Buada. Distribution of soils is discussed and physical, chemical, and mineralogical properties of the soils are presented. Soils were basically AC profiles, with coarse textures, free drainage, and limited moisture-retention capacities. Organic matter accumulated to various depths from about 5 to 50 cm. Soil pH was generally above 6, cation exchange capacities were closely aligned to organic matter contents, but trace element deficiencies would have been common. Cadmium concentrations were relatively high in Nauru soils. The soils are likely to have been of limited fertility, with moisture being a major limitation in many years. Classification of the soils indicated a dominance of Ustropepts and Ustolls, with smaller areas of Ustipsamments and Ustorthents, and very small areas of soils showing aquic features. The postmining situation is also discussed; only very limited areas of three of the original soil associations remain (the relatively deep profiles free of pinnacle influence have completely disappeared). Limitations to rehabilitation are also briefly reviewed.
dc.format.extent 18 pages
dc.language.iso en-US
dc.publisher University of Hawaii Press
dc.relation.ispartofseries vol. 59, no. 4
dc.subject.lcsh Natural history--Periodicals.
dc.subject.lcsh Science--Periodicals.
dc.subject.lcsh Natural history--Pacific Area--Periodicals.
dc.title Pre-mining pattern of soils on Nauru, Central Pacific
dc.type Article
dc.type.dcmi Text
dc.identifier.doi 10.1353/psc.2005.0050
local.identifier.callnumber QH1 .P33
Appears in Collections: Pacific Science Volume 59, Number 4, 2005


Please email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.

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