La Trobe
2015 ZhangCJ Plant Soil 397,331.pdf (567 kB)

Contrasting effects of organic amendments on phytoextraction of heavy metals in a contaminated sediment

Download (567 kB)
journal contribution
posted on 06.01.2021, 00:55 by C Zhang, Gary Clark, AF Patti, N Bolan, M Cheng, Peter Sale, Caixian Tang
© 2015, Springer International Publishing Switzerland. Background and aims: Soil amendments are often added to polluted soils to increase phytoremediation efficiency. Here we investigated the potential of a range of organic amendments for phytoextraction of heavy metals in a contaminated sediment. Methods: Two experiments compared adsorption and phytoextraction of heavy metals by a Cd-hyperaccumulator Carpobrotus rossii grown in the contaminated sediment amended with six organic amendments. Results: The adsorption capacity as measured by Langmuir adsorption maximum followed the order of Cr > Zn > Cu > Cd, and the effect of organic amendments followed the order of chicken manure > cow manure > brown coal > golden wattle biochar > blue gum biochar > radiata pine biochar. The addition of amendments increased the adsorption of heavy metals, with brown coal resulting in the lowest concentrations of water-extractable Cd, Cu and Zn. Two manures resulted in the highest concentrations of these water-extractable heavy metals in the rhizosphere soil of C. rossii. Furthermore, brown coal resulted in higher shoot accumulation of these heavy metals than three wood-derived biochars, whilst the manures generally had the lowest accumulation of Cd and Cu although they increased shoot biomass. Conclusions: The addition of brown coal decreased whereas manure addition increased the mobility (water-extractable fraction) of heavy metals in rhizosphere soil. Phytoextraction of Cd and Cu was greater with brown coal than with biochars or manures. Brown coal is suitable for enhancing phytoextraction of these heavy metals because it could increase their accumulation in shoots of C. rossii and decrease the risk of leaching of these heavy metals into groundwater.

Funding

We thank Dr. Augustine Doronila for his assistance to collect the sediment, Drs. Xiaojuan Wang and Gaelle Ng Kam Chuen for their assistance in chemical analysis and Mr. Rob Evans for setting up the experiment. We also thank an anonymous reviewer for the constructive comments. This research was supported by an Australian Research Council Linkage Project (LP100100800).

History

Publication Date

01/01/2015

Journal

Plant and Soil: international journal on plant-soil relationships

Volume

397

Issue

1-2

Pagination

15p. (p. 331-345)

Publisher

Springer Verlag (Germany)

ISSN

0032-079X

Rights Statement

The Author reserves all moral rights over the deposited text and must be credited if any re-use occurs. Documents deposited in OPAL are the Open Access versions of outputs published elsewhere. Changes resulting from the publishing process may therefore not be reflected in this document. The final published version may be obtained via the publisher’s DOI. Please note that additional copyright and access restrictions may apply to the published version.