NDLI: A chronosequence of bauxite residue sand: weathering and vegetation response

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A chronosequence of bauxite residue sand: weathering and vegetation response

Content Provider	Semantic Scholar
Author	Dobrowolski, Mark P. Phillips, Ian R. Fey, Martin V.
Copyright Year	2010
Abstract	Abstract We aimed to identify the edaphic characteristics limiting vegetation performance on rehabilitated bauxite residue storage areas. A chronosequence (up to 25 y) of rehabilitation sites was investigated at Alcoa of Australia’s residue storage areas at Kwinana and Pinjarra, Western Australia, where gypsum-amended residue sand has been rehabilitated with native vegetation or pasture. Vegetation diversity and biomass were assessed within 6-m squares from which soil samples from different depths in the residue profile were taken for analysis. An exponential decline with time in maximum electrical conductivity (EC) was demonstrated using quantile regression while a progressive reduction in spatial variability of EC with time was also evident. Vegetation biomass index was more strongly related to age of residue than to period since establishment, indicating a diminishing limitation with time of some edaphic factor such as salinity. Additional sites will allow identification of such factors systematically through the environmental envelope approach using quantile regression. The present data, in confirming that simple parameters for assessing rehabilitation progress show consistent trends with time, indicate the potential value of these sites for providing additional more complex chronosequences such as evolution of secondary minerals, accumulation and humification of organic matter, and the development of complex microbial communities, all of which probably have an effect on ecosystem stability.
Starting Page	1
Ending Page	4
Page Count	4
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://iuss.org/19th%20WCSS/Symposium/pdf/1030.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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