Uptake of selected PAHs from contaminated soils by rice seedlings ( Oryza sativa) and influence of rhizosphere on PAH distribution

• Published in: Environmental pollution (1987) Vol. 155; no. 2; pp. 359 - 365
• Main Authors: Su, Yu-Hong, Zhu, Yong-Guan
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.2008; Elsevier
• Subjects: Aged soil; Agronomy. Soil science and plant productions; bioaccumulation; biodegradation; Biodegradation, Environmental; Biological and medical sciences; Biomass; China; Ecology - methods; Fundamental and applied biological sciences. Psychology; losses from soil; mass balance; naphthalene; Naphthalenes - analysis; Naphthalenes - metabolism; Oryza - metabolism; Oryza sativa; PAHs; phenanthrene; Phenanthrenes - analysis; Phenanthrenes - metabolism; Plant Roots - chemistry; Plant Roots - metabolism; Plant Shoots - chemistry; Plant Shoots - metabolism; polycyclic aromatic hydrocarbons; Polycyclic Aromatic Hydrocarbons - analysis; Polycyclic Aromatic Hydrocarbons - metabolism; pyrene (hydrocarbon); Pyrenes - analysis; Pyrenes - metabolism; rhizosphere; Rhizosphere effect; rice; Rice ( Oryza sativa); roots; Seedlings; shoots; Soil and water pollution; Soil Microbiology; soil microorganisms; Soil Pollutants - analysis; Soil Pollutants - metabolism; soil pollution; Soil science; soil solution; Uptake; Volatilization; PAHs; Rice ( Oryza sativa); Rhizosphere effect; Aged soil; Uptake; Monocotyledones; Organic matter; Cultivated soil; Plant juvenile growth stage; Soil pollution; Cereal crop; Environmental engineering; Rice (Oryza sativa); Persistent organic pollutant; Oryza sativa; Absorption; Polluted soil; Gramineae; Angiospermae; Soil science; Soil interaction; Bioremediation; Soil solution; Influence factor; Age; Phenanthrene; Ecotoxicology; Root; Pollutant behavior; Polycyclic aromatic compound; Sporophyte; Paddy soil; Agroecosystem; Phytoremediation; Persistence; Pyrene; Rhizosphere; Naphthalene; Soil biology; Spermatophyta; Soil plant relation; Shoot; Chemical contamination; Concentration distribution
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2007.11.008

The uptake of selected polycyclic aromatic hydrocarbons (PAHs) by rice ( Oryza sativa) seedlings from spiked aged soils was investigated. When applied to soils aged for 4 months, naphthalene, phenanthrene, and pyrene exhibited volatilization loss of 98, 95, and 30%, respectively, with the remaining fraction being fixed by soil organic matter and/or degraded by soil microbes. In general, concentrations of the three PAHs in rice roots were greater than those in the shoots. The concentrations of root associated PHN and PYR increased proportionally with both soil solution and rhizosphere concentrations. PAH concentrations in shoots were largely independent of those in soil solution, rice roots, or rhizosphere soil. The relative contributions of plant uptake and plant-promoted rhizosphere microbial biodegradation to the total mass balance were 0.24 and 14%, respectively, based on PYR concentrations in rhizosphere and non-rhizosphere soils, the biomass of rice roots, and the dry soil weight. Contributions of plant uptake and rhizosphere effect on removal of PAHs from soils are relatively insignificant.