Air-plant/soil exchange process and flux of polycyclic aromatic hydrocarbons in winter in the typical water-level-fluctuation zone of the Three Gorges Reservoir region, China
XIE Dong-hang1,2, WANG Feng-wen1,2, LIU Wen-xing1,2, ZHANG Si-yuan1,2
1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Department of Environmental Science, Chongqing University, Chongqing 400044, China
Abstract:Affected by the seasonal "storage-discharge" of the Three Gorges Dam, the water level fluctuation zone (WLFZ) of the Three Gorges Reservoir Region (TGRR) show a periodic change of "submergence-exposure" each year, and the environmental geochemical processes of organic matter in this area changed accordingly. This study took polycyclic aromatic hydrocarbons (PAHs) as the targeted compounds. The coupled air, plant and soil samples (n=40) were consecutively collected. These samples were analyzed for USEPA 16PAHs to explore their composition characters and estimate the air-plant/soil exchange flux. The concentration of PAHs in air, soil and plants were 5.65~13.47ng/m3, 70.86~135.44ng/g, 78.23~1084.72ng/g, with an average of (8.58±2.78) ng/m3, (90.10±22.18) ng/g and (360.36±309.54) ng/g respectively. 2 to 3 ring PAHs dominated in the air, contributing 62.3% of the total. 3 to 4 ring PAHs dominated in plants, with a contribution of 73.3%. 3 and 5 ring PAHs in dominated soil, accounting for 52.1% of the total. The molecular diagnostic ratio of PAHs indicated that petroleum could be the main source of PAHs in plant. Biomass and fossil fuel combustion were the main sources of PAHs in air and soil. "One-compartment model" indicated that the main way for plants to absorb PAHs was gaseous deposition which was restricted by the plant-gas dynamic equilibrium. The fugacity model showed that the air-soil exchange flux of 3-ring, 4-ring and 5~6-rings PAHs were -19.20, -0.14 and 0.89, respectively. 3~4rings PAHs in the soil were mainly re-volatile into the atmosphere, while 5~6 rings in the atmosphere mainly deposited into the soil. The dry deposition flux of PAHs was between 293.35 and 833.61ng/(m2·d), with an average of 517.82ng/(m2·d) and dominated by 5~6 rings (59.02%). As investigating the multi-medium exchange process of PAHs in winter, this study could reveal the absorption and deposition role of different monomial PAHs by plants and soil. These datasets provide important basis for further study on environmental geochemical cycle of PAHs in different seasons in the TGRR.
谢东杭, 王锋文, 刘文欣, 张思远. 三峡库区典型消落带冬季多环芳烃大气-植物/土壤交换过程与通量[J]. 中国环境科学, 2022, 42(12): 5864-5876.
XIE Dong-hang, WANG Feng-wen, LIU Wen-xing, ZHANG Si-yuan. Air-plant/soil exchange process and flux of polycyclic aromatic hydrocarbons in winter in the typical water-level-fluctuation zone of the Three Gorges Reservoir region, China. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5864-5876.
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