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- Title
Effects of Elevated CO and Pb on Phytoextraction and Enzyme Activity.
- Authors
Sunghyun Kim; Hojeong Kang
- Abstract
The wide-ranging impacts of globally increasing carbon dioxide (CO) concentration and rising metal-contaminated soils are serious problems in terrestrial ecosystems. In this study, we investigated the effects of elevated CO on the lead (Pb) uptake of pine seedlings and the microbial activity in Pb-contaminated soil. Three-year-old pine seedlings were exposed to ambient, as well as elevated levels of CO (380 and 760 ppmv, respectively) in 500 mg/kg Pb-contaminated soil. Growth rates, C/N ratios and Pb uptake of the pine seedlings were determined. Dissolved organic carbon (DOC) content and microbial activity were also measured in the rhizosphere soil. Elevated CO significantly increased the total biomass and accumulation of Pb in roots and shoots. In addition, the accumulation of Pb in the roots under elevated CO concentration was four times higher than those in the roots under ambient CO concentration. Elevated CO levels also affected C/N ratios in the pine seedlings and soil enzyme activities. Decline in the overall nitrogen content and increases in the C/N ratios of pine needles were observed. Soil enzyme activity increased in the rhizosphere soils, including those of β-glucosidases, N-acetylglucosaminidases, and phosphatases. Quality of the DOC was affected by elevated CO, while the quantity of DOC was affected by Pb additions under elevated CO conditions. Two major conclusions can be drawn from this study: (1) elevated CO significantly increased biomass and metal uptake of pine seedlings and (2) chemical metabolism on pine tissue and processes of organic decomposition were more affected by elevated CO levels than by Pb contamination.
- Subjects
SOIL pollution; LEAD &; the environment; CARBON dioxide &; the environment; PINE seed; BIOMASS; ENZYME activation; RHIZOSPHERE
- Publication
Water, Air & Soil Pollution, 2011, Vol 219, Issue 1-4, p365
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-010-0713-5