Dissipation of polycyclic aromatic hydrocarbons and microbial activity in a field soil planted with perennial ryegrass

doi:10.1007/s11783-011-0366-7

Front Envir Sci Eng

2012, Vol. 6

Issue (3) : 330-335 https://doi.org/10.1007/s11783-011-0366-7

RESEARCH ARTICLE

Dissipation of polycyclic aromatic hydrocarbons and microbial activity in a field soil planted with perennial ryegrass

Dengqiang FU¹, Ying TENG¹, Yuanyuan SHEN¹, Mingming SUN¹, Chen TU¹, Yongming LUO¹(

), Zhengao LI¹, Peter CHRISTIE²

1. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; 2. Agri-Environment Branch, Agri-Food and Biosciences Institute, Newforge Lane, Belfast BT9 5PX, UK

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Abstract

Dissipation and plant uptake of polycyclic aromatic hydrocarbons (PAHs) in contaminated agricultural soil planted with perennial ryegrass were investigated in a field experiment. After two seasons of grass cultivation the mean concentration of 12 PAHs in soil decreased by 23.4% compared with the initial soil. The 3-, 4-, 5-, and 6-ring PAHs were dissipated by 30.9%, 25.5%, 21.2%, and 16.3% from the soil, respectively. Ryegrass shoots accumulated about 280 μg·kg^-1, shoot dry matter biomass reached 2.48 × 10⁴ kg·ha^-1, and plant uptake accounted for about 0.99% of the decrease in PAHs in the soil. Significantly higher soil enzyme activities and microbial community functional diversity were observed in planted soil than that in the unplanted control. The results suggest that planting ryegrass may promote the dissipation of PAHs in long-term contaminated agricultural soil, and plant-promoted microbial degradation may be a main mechanism of phytoremediation.

Keywords perennial ryegrass polycyclic aromatic hydrocarbon bioremediation plant uptake soil microbial activity

Corresponding Author(s): LUO Yongming,Email:ymluo@issas.ac.cn

Issue Date: 01 June 2012

Cite this article:

Dengqiang FU,Ying TENG,Yuanyuan SHEN, et al. Dissipation of polycyclic aromatic hydrocarbons and microbial activity in a field soil planted with perennial ryegrass[J]. Front Envir Sci Eng, 2012, 6(3): 330-335.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-011-0366-7
https://academic.hep.com.cn/fese/EN/Y2012/V6/I3/330

Tab.1 Concentrations of PAHs in unplanted and vegetated soil over time

Tab.2 Plant biomass and total PAH accumulation in ryegrass shoots

Fig.1 Mean concentrations of PAHs with different ring numbers in ryegrass shoots in both growing seasons

Tab.3 Activities of two soil oxidoreductases in planted and unplanted soil

Fig.2 Variation in average well–color development (AWCD) for soil samples from both treatments after 20 months of ryegrass growth. CK: unplanted plots (◇); PR: plots planted with perennial ryegrass (?)

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