NDLI: Phytoremediation for soils contaminated by phenanthrene and pyrene with multiple plant species

Content Provider	Springer Nature Link
Author	Wei, Shiqiang Pan, Shengwang
Copyright Year	2010
Abstract	The remediation of soil polluted by polycyclic aromatic hydrocarbons (PAHs) is of great importance due to the persistence and carcinogenic properties of PAHs. Phytoremediation has been regarded as a promising alternative among suggested approaches. For the establishment of highly effective remediation method and better understanding of the remediation mechanisms by plants, the potentials of three plant species and their planting patterns on the remediation efficacy were studied by pot experiments.Soils were amended with phenanthrene (Phe) or pyrene (Pyr) at five levels ranging from 0∼322 mg kg$^{–1}$, then incubated for 30 days. At each level of PAHs, four treatments were set as: (a) treatments 1, no plant and microbe-inhibited with addition of 0.1%NaN$_{3}$; (b) treatments 2, no plant and without the addition of NaN$_{3}$; (c) treatments 3, microbe-inhibited and planted; (d) treatments 4, planted and without inhibition of microbes. For each planted treatment, single cropping of rape (Medicago sativa), alfalfa (Brassica campestris), and white clover (Trifolium repens), and mixed cropping of rape with alfalfa and white clover were adapted. Seedlings of 7 days old were then cultivated. After 70 days cultivation, soil and plant of each treatment were sampled for analyses of PAHs.Rape, alfalfa, and white clover all significantly promoted the degradation of PAHs in soils; alfalfa and white clover showed higher efficiencies for the removal of PAHs. Averagely, about 41.46% of Phe or 33.69% of Pyr were removed from soils after 70-day plantation of alfalfa, and 38.75% of Phe or 36.29% of Pyr removed by white clover, as compared to the much lower degradation rates of 22.57% of Phe or 18.24% of Pyr for non-planted controls. Mixed cropping significantly enhanced the remediation efficiencies as compared to single cropping; about 74.87% of Phe or 62.81% of Pyr were removed by mixed cropping of rape and alfalfa, and 72.01% of Phe or 68.44% of Pyr by mixed cropping of rape and white clover.The presence of vegetation significantly promoted the dissipation of Phe or Pyr in soils and remediation efficiency varied greatly among plant species and cropping patterns. Rape had the lowest ability for the removal of PAHs, while alfalfa showed highest ability for the remediation of Phe and white clover was most effective for Pyr. Mixed cropping of rape with alfalfa or white clover was however far better for the remediation of soil PAHs than single cropping.
Starting Page	886
Ending Page	894
Page Count	9
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	10
Issue Number	5
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-31
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cropping pattern PAHs Phenanthrene Phytoremediation Pyrene Soil Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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