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

作　　者：Dengqiang FU Ying TENG Yuanyuan SHEN Mingming SUN Chen TU Yongming LUO Zhengao LI Peter CHRISTIE 

机构地区：[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 BT95PX,UK

出　　处：《Frontiers of Environmental Science & Engineering》2012年第3期330-335,共6页环境科学与工程前沿（英文）

基　　金：Acknowledgements This work was supported by grants from the National High Technology Research and Development Program of China （863 Program） （No. 2007AA061110）, the Knowledge Innovation of the Chinese Academy of Sciences （Project KSCX2-YW-G-071） and the Natural Science Foundation of Jiangsu Province （Project BK2009016）.

摘　　要：Dissipation and plant uptake of polycyclic aromatic hydrocarbons （PAHs） in contaminated agricul- tural 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 ug.kg1, shoot dry matter biomass reached 2.48 x 104kg-ha1, 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.Dissipation and plant uptake of polycyclic aromatic hydrocarbons （PAHs） in contaminated agricul- tural 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 ug.kg1, shoot dry matter biomass reached 2.48 x 104kg-ha1, 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.

关 键 词：perennial ryegrass polycyclic aromatic hydrocarbon bioremediation plant uptake soil microbial activity 

分 类 号：X132[环境科学与工程—环境科学] S688.4[农业科学—观赏园艺]