Shifts in leaf N: P stoichiometry during rehabilitation in highly alkaline bauxite processing residue sand

Johnvie B. Goloran, Chengrong Chen, Ian R. Phillips, James Elser

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number14811
JournalScientific Reports
Volume5
DOIs
StatePublished - Oct 7 2015

Fingerprint

processing residues
stoichiometry
sand
leaves
indigenous species
aluminum oxide
ecological restoration
soil chemical properties
vegetation cover
soil pH
soil
bauxite
phosphorus
ecosystems
nutrients
nitrogen

ASJC Scopus subject areas

  • General

Cite this

Shifts in leaf N : P stoichiometry during rehabilitation in highly alkaline bauxite processing residue sand. / Goloran, Johnvie B.; Chen, Chengrong; Phillips, Ian R.; Elser, James.

In: Scientific Reports, Vol. 5, 14811, 07.10.2015.

Research output: Contribution to journalArticle

@article{d979837b6a5043609dc03bb09f2fe717,
title = "Shifts in leaf N: P stoichiometry during rehabilitation in highly alkaline bauxite processing residue sand",
abstract = "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.",
author = "Goloran, {Johnvie B.} and Chengrong Chen and Phillips, {Ian R.} and James Elser",
year = "2015",
month = "10",
day = "7",
doi = "10.1038/srep14811",
language = "English (US)",
volume = "5",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Shifts in leaf N

T2 - P stoichiometry during rehabilitation in highly alkaline bauxite processing residue sand

AU - Goloran, Johnvie B.

AU - Chen, Chengrong

AU - Phillips, Ian R.

AU - Elser, James

PY - 2015/10/7

Y1 - 2015/10/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84943311481&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84943311481&partnerID=8YFLogxK

U2 - 10.1038/srep14811

DO - 10.1038/srep14811

M3 - Article

AN - SCOPUS:84943311481

VL - 5

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 14811

ER -