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821.
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Sébastien Denys Claire Rollin Francis Guillot Hafid Baroudi 《Water, Air, & Soil Pollution: Focus》2006,6(3-4):299-315
Phytoremediation of pollutants in soils is an emerging technology, using different soil-plant interaction properties. For
organic pollutants, such as polycyclic aromatic hydrocarbons (PAHs), phytodegradation seems to be the most promising approach.
It occurs mostly through an increase of the microbial activity in the plant rhizosphere, allowing the degradation of organic
substances, a source of carbon for soil microbes. Despite a large amount of available data in the literature concerning laboratory
and short term PAH phytodegradation experiments, no actual field application of such technique was previously carried out.
In the present study, a soil from a former coking plant was used to evaluate the feasibility and the efficiency of PAH phytodegradation
in the field during a three years trial and following a bioremediation treatment. Before the phytoremediation treatment, the
soil was homogenized and split into six independent plots with no hydrological connections. On four of these plots, different
types of common plant species were sowed: mixture of herbaceous species, short cut (P1), long cut (P2), ornamental plants
(P3) and trees (P4). Natural vegetation was allowed to grow on the fifth plot (P5), and the last plot was weeded (P6). Each
year, representative sampling of two soil horizons (0–50 and 50–100 cm) was carried out in each plot to characterize the evolution
of PAHs concentration in soils and in soils solution obtained by lixiviation. Possible impact of the phytoremediation technique
on ecosystems was evaluated using different eco- and genotoxicity tests both on the soil solid matrix and on the soil solution.
For each soil horizon, comparable decrease of soil total PAHs concentrations were obtained for three plots, reaching a maximum
value of 26% of the initial PAHs concentration. The decrease mostly concerned the 3 rings PAHs. The overall low decrease in
PAHs content was linked to a drastic decrease in PAHs availability likely due to the bioremediation treatment. However, soil
solutions concentration showed low values and no signficant toxicity was characterized. The mixture of the herbaceous species
seemed to be the most promising plants to be used in such procedure. 相似文献
823.
An analysis of the spatial distribution of large soil invertebrates at the “study point” level in three forest soils of the European part of the Russian Federation has demonstrated that the number of 76-cm2 soil cores necessary for obtaining representative data varies from 25 to 35. To estimate taxonomic diversity in peaty, soddy podzolic, and brown forest soils, 100–110, 70–80, and 90–100 soil cores, respectively, are required. Differences in the necessary number of cores of different forest soils are accounted for by differences in the distribution pattern of soil animals. 相似文献
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825.
The seasonal changes in the concentrations of aluminium (Al), calcium (Ca), cadmium (Cd), chromium (Cr), copper (Cu), magnesium (Mg), manganese (Mn), lead (Pb), and zinc (Zn) in the leaves of Taraxacum officianale, Plantago lanceolata and Plantago major are investigated. the most convenient periods for sampling are established when the elemental concentrations have minimal variation and are independent on the development of the plant itself. On this basis, the presumption is made that the most appropriate sampling period for herbaceous species for biomonitoring processes is the end of blossoming of the plant or immediately after that. 相似文献
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