Delimiting soil chemistry thresholds for nickel hyperaccumulator plants in Sabah (Malaysia)
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- 作者：Antony van der Ent ; Guillaume Echevarria ; Mark Tibbett
- 关键词：Diffusion sink ; Nickel speciation ; Labile pools ; Root exudates
- 刊名：Chemoecology
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：26
- 期：2
- 页码：67-82
- 全文大小：1,532 KB
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Guillaume Echevarria (2)
Mark Tibbett (3)
1. Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, St Lucia, QLD, 4072, Australia
2. Laboratoire Sols et Environnement, UMR 1120, Université de Lorraine – INRA, 54000, Nancy, France
3. Centre for Agri-Environmental Research & Soil Research Centre, School of Agriculture, Policy and Development, University of Reading, RG6 6AR, Reading, UK - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Ecology
Nature Conservation - 出版者：Birkh盲user Basel
- ISSN：1423-0445
文摘
Nickel hyperaccumulator plants have been the focus of considerable research because of their unique ecophysiological characteristics that can be exploited in phytomining technology. Comparatively little research has focussed on the soil chemistry of tropical nickel hyperaccumulator plants to date. This study aimed to elucidate whether the soil chemistry associated with nickel hyperaccumulator plants has distinctive characteristics that could be indicative of specific edaphic requirements. The soil chemistry associated with 18 different nickel hyperaccumulator plant species occurring in Sabah (Malaysia) was compared with local ultramafic soils where nickel hyperaccumulator plants were absent. The results showed that nickel hyperaccumulators in the study area were restricted to circum-neutral soils with relatively high phytoavailable calcium, magnesium and nickel concentrations. There appeared to be a ‘threshold response’ for the presence of nickel hyperaccumulator plants at >20 μg g−1 carboxylic-extractable nickel or >630 μg g−1 total nickel, and >pH 6.3 thereby delimiting their edaphic range. Two (not mutually exclusive) hypotheses were proposed to explain nickel hyperaccumulation on these soils: (1) hyperaccumulators excrete large amounts of root exudates thereby increasing nickel phytoavailability through intense rhizosphere mineral weathering; and (2) hyperaccumulators have extremely high nickel uptake efficiency thereby severely depleting nickel and stimulating re-supply of Ni from diffusion from labile Ni pools. It was concluded that since there was an association with soils with highly labile nickel pools, the available evidence primarily supports hypothesis (2).