三峡库区干湿交替过程中消落带土壤多环芳烃的扩散行为  

Diffusion Behavior of PAHs in the Soil of Water Level Fluctuation Zone during the Dry-Wet Alternation Process in the Three Gorges Reservoir Area

作　　者：张傲然 邱霖萱 陈婧怡 聂汇雨 胥焘[1,3] 罗玉红 席颖[1,2] ZHANG Aoran;QIU Linxuan;CHEN Jingyi;NIE Huiyu;XU Tao;LUO Yuhong;XI Ying(Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,Hubei,China;College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei,China;College of Biological and Pharmaceutical Sciences,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002 [3]三峡大学生物与制药学院,湖北宜昌443002

出　　处：《武汉大学学报（理学版）》2024年第1期17-26,共10页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(42107441,42177397);国家地方高校能源和环境材料化学学科创新引智项目(D20015)。

摘　　要：以三峡库区香溪河库湾消落带土壤为研究对象,通过室内模拟干湿交替过程,利用逸度扩散模型,研究了三峡库区土壤典型多环芳烃(PAHs)单体菲(PHE)和芘(PYR)的扩散行为。结果显示,土壤PHE和PYR浓度随着干湿交替过程的进行逐渐降低,最终趋于平稳;PHE和PYR的逸度分数经过了两个干湿交替过程逐渐增大,且PHE的逸度分数大于PYR,具有更高的释放风险。土壤理化性质变化显著:pH经过两个淹没期分别升高了约11.48%和12.30%;总有机碳(TOC)分别降低了约40.90%和24.75%;粒径在>2~50μm范围的土壤颗粒占比经过两个淹没期分别降低了约7.70%和4.90%,而粒径在≤2μm范围的土壤颗粒占比经过两个淹没期分别增加了约7.20%和5.30%。受干湿交替过程中PAHs和TOC浓度变化的影响,土壤过氧化氢酶(CAT)和β-葡萄糖苷酶(BGL)活性整体呈现降低的趋势,分别在0.14~0.07、67.42~43.01μmol·h^(-1)·g^(-1)范围内变化。Pearson相关性分析显示,土壤PHE、PYR浓度与TOC浓度均呈极显著正相关性(P<0.01),与BGL浓度呈显著正相关性(P<0.05),与粒径在>2~50μm范围的土壤颗粒占比呈显著正相关性(P<0.05),而与粒径在≤2μm范围的土壤颗粒占比呈显著负相关性(P<0.05)。The study,by using a fugacity-diffusion model,investigated the diffusion behavior of typical polycyclic aromatic hydrocarbons(PAHs)monomer phenanthrene(PHE)and pyrene(PYR)in soil in water fluctuation zone of Xiangxi Bay in the Three Gorges Reservoir Area.The results demonstrated that the concentrations of PHE and PYR in the soil gradually decreased during the dry-wet alternating processes,eventually reaching a stable state.The fugacity fraction of PHE and PYR increased gradually after two cycles of wetting and drying,with PHE having a higher fugacity fraction and a higher risk of release than PYR.Significant changes were observed in the physical and chemical properties of the soil:pH increased by approximately 11.48%and 12.30%after two inundation periods,while total organic carbon(TOC)decreased by 40.90%and 24.75%,respectively.The proportion of soil particles with a particle size of>2~50μm decreased by approximately 7.70%and 4.90%after two inundation periods,whereas the proportion of soil particles with a particle size rang of≤2μm increased by approximately 7.20%and 5.30%,respectively.The activities of catalase(CAT)andβ-glucosidase(BGL)decreased in the range of 0.14~0.07 and 67.42~43.01μmol·h^(-1)·g^(-1),respectively,due to the changes in PAHs and TOC concentrations during the dry-wet alternating process.Pearson correlation analysis revealed extremely significant positive correlations between the concentrations of PHE and PYR in the soil with TOC concentration(P<0.01),and significant positive correlations with BGL concentration(P<0.05)and with the proportion of soil particles with a particle size range of>2~50μm(P<0.05).Conversely,a significant negative correlation was observed with the proportion of soil particles with a particle size range of≤2μm(P<0.05).

关 键 词：三峡库区 消落带 干湿交替 多环芳烃 扩散行为 

分 类 号：X53[环境科学与工程—环境工程]