Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5951
Título: Remediation of a mine soil with insoluble polyacrylate polymers enhances soil quality and plant growth
Autor: Guiwei, Q.
Varennes, A.
Cunha-Queda, C.
Palavras-chave: orchardgrass
mine soils
polyacrylate polymers
soil quality
enzymatic activities
Data: 2008
Editora: British Society of Soil Science
Citação: "Soil Use and Management". ISSN 0266-0032. 24 (2008) 350-356
Resumo: We investigated the effects of different application rates of insoluble hydrophilic polyacrylate polymers on plant growth and soil quality from a Pb-contaminated mine soil. The polymer increased the waterholding capacity of the soil from about 250 g ⁄ kg in unamended soil to almost 1000 g ⁄ kg in soil with 0.6% polymer. However, the capacity of the polymer to retain water decreased progressively, presumably as the polymer sorbed Pb. Growth of orchardgrass (Dactylis glomerata L. cv. Amba) was stimulated in the polymer-amended soil. The greatest accumulated biomass over four cuts was obtained in soil amended with 0.4% of polymer. After orchardgrass had been growing for 101 days, the amounts of CaCl2-extractable Pb present in the polymer-amended soil were 15–66% of those in the unamended soil, depending on polymer application rate. The number of bacteria culturable on agar enriched with ‘Nutrient’ and yeast extract, and the activities of dehydrogenase, phosphatase, b-glucosidase, protease and cellulase increased following polymer application. In contrast, urease activity was impaired by polymer application, presumably due to the presence of ammonium as a counter ion. Principal component analysis was used to compare the effects of the different rates of polymer application. Overall, the application of 0.2 or 0.4% polymer resulted in closer values for the indicators of soil quality used than the treatment with 0.6% polymer.
Peer review: yes
URI: http://hdl.handle.net/10400.5/5951
ISSN: 0266-0032
Versão do Editor: doi: 10.1111/j.1475-2743.2008.00173.x
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