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Description
Large quantities of sodic and alkaline bauxite residue are produced globally as a by-product from alumina refineries. Ecological stoichiometry of key elements [nitrogen (N) and phosphorus (P)] plays a critical role in establishing vegetation cover in bauxite residue sand (BRS). Here we examined how changes in soil chemical properties over time in rehabilitated sodic and alkaline BRS affected leaf N to P stoichiometry of native species used for rehabilitation. Both Ca and soil pH influenced the shifts in leaf N:P ratios of the study species as supported by consistently significant positive relationships (P < 0.001) between these soil indices and leaf N:P ratios. Shifts from N to P limitation were evident for N-fixing species, while N limitation was consistently experienced by non-N-fixing plant species. In older rehabilitated BRS embankments, soil and plant indices (Ca, Na, pH, EC, ESP and leaf N:P ratios) tended to align with those of the natural ecosystem, suggesting improved rehabilitation performance. These findings highlight that leaf N:P stoichiometry can effectively provide a meaningful assessment on understanding nutrient limitation and productivity of native species used for vegetating highly sodic and alkaline BRS, and is a crucial indicator for assessing ecological rehabilitation performance.
ContributorsGoloran, Johnvie B. (Author) / Chen, Chengrong (Author) / Phillips, Ian R. (Author) / Elser, James (Author) / College of Liberal Arts and Sciences (Contributor) / School of Life Sciences (Contributor)
Created2015-10-07
ContributorsDi Russo, Michelle (Conductor) / Alpizar, Mark (Conductor) / Shaker, Shannon (Conductor) / Gupta, Kamna (Conductor) / ASU Library. Music Library (Publisher)
Created2017-11-29
ContributorsPercussion Jazz Ensemble (Performer) / ASU Library. Music Library (Publisher)
Created2017-11-20
ContributorsSmith, J. B., 1957- (Director) / Mancuso, Simone (Director) / Contemporary Percussion Ensemble (Performer) / ASU Library. Music Library (Contributor)
Created2017-11-19
ContributorsSmith, Aaron (Performer) / Solari, John (Performer) / Hammond, Marinne (Performer) / Shaner, Hayden (Performer) / Kempton, Emily (Performer) / Wills, Grace (Performer) / Rumney, Emily (Performer) / Neff, Megyn (Performer) / DiBarry, Michael (Performer) / ASU Library. Music Library (Publisher)
Created2017-11-17
ContributorsWorld Percussion Ensemble (Performer) / ASU Library. Music Library (Publisher)
Created2017-11-14