Boron accumulation and tolerance of hybrid poplars grown on a B-laden mixed paper mill waste landfill.
Autor: | Rees R; Institute of Terrestrial Ecosystems, ETH Zürich, Universitätsstrasse 16, 8092 Zürich, Switzerland. rainer.rees@env.ethz.ch, Robinson BH, Rog CJ, Papritz A, Schulin R |
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Jazyk: | angličtina |
Zdroj: | The Science of the total environment [Sci Total Environ] 2013 Mar 01; Vol. 447, pp. 515-24. Date of Electronic Publication: 2012 Jun 22. |
DOI: | 10.1016/j.scitotenv.2012.05.089 |
Abstrakt: | Paper mill wastes are a mixture of by-products from pulp production and on-site energy production, consisting of paper mill sludge, ash and cinders. Landfilling of these highly boron (B) and heavy metal laden waste products carries environmental risks. Poplars have been successfully employed in the phytomanagement and hydraulic control of B contaminated sites. Here, we assess the performance of hybrid poplars on a paper-mill waste landfill, investigate the accumulation of B by the trees and explore the relationship between local-scale root growth and substrate properties. Leaf and root tissue samples were collected on three plots and analyzed for their chemical properties and root traits. Additionally, we sampled four soil cores in the vicinity of each of the trees and determined chemical and physical properties. Using a principal component analysis followed by a cluster analysis, we identified three substrate types. This method delineated the soil effects on tree survival and growth, although correlations with individual soil element concentrations were weak. Despite signs of B toxicity in some leaves, B was not the key limiting factor for poplar growth. Instead, Ca deficiency caused by a Mg:Ca imbalance was the primary reason for the poor performance of some trees. Root growth was not limited by toxicity effects of soil contaminants. Our results show that hybrid poplars perform well under the harsh growing conditions on a multi-contaminated, B-laden substrate in a hemiboreal climate. Exploiting the differences in the performance of the four clones in relation to the soil types, could increase the success of revegetation on this and other landfills. (Copyright © 2012 Elsevier B.V. All rights reserved.) |
Databáze: | MEDLINE |
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