摘要
依据3a定位研究数据,采用气相色谱法对樟树林生态系统水文过程中PAHs的迁移转化机理进行了研究,结果表明:大气降水中携带的PAHs有10种,总含量为288.662μg.L-1;林内穿透水中PAHs有6种,总含量为101.901μg.L-1;树干茎流水中有5种,总含量为82.069μg.L-1;灌木层和草本层穿透水中只有4种,总含量分别为49.049μg.L-1和74.938μg.L-1。大气降水中的PAHs经过树冠、树干、灌木和草本层的吸收、淋溶和淋洗作用后,有的种类表现为完全被吸收而消失,有的种类浓度大幅度降低,而有的种类则浓度增大。随地表径流迁移水中PAHs有5种,总含量为36.866μg.L-1,与大气降水相比,PAHs种类减少50%,浓度降低87%。同时阐述了水文学过程中PAHs迁移转化机理和樟树林具有较高的净化效能。该项研究为城市森林的铲污机制提供了理论依据。
The characterizations of polycyclic aromatic hydrocarbons （PAHs） compositions in the hydrological processes were examined in Camphor forest ecosystems, Zhuzhou, China. The concentrations of PAHs in rainfall above forest canopy, throughfall, stemflow, and surface runoff components were measured by gas chromatography （GC-HP6890）. A total of 10 PAHs were detected in rainfall above canopy, and the number of the detected PAHs was 6 and 5 in throughfall and stemflow,respectively. The concentrations of total PAHs in rainfall above canopy was 288.662μg· L^-1 , which was approximately 2.8 and 3.5 times as high as that in throughfall （101.901μg·L^-1） and stemflow （82.069μg·L^-1）, respectively. The amount and concentration of total PAHs were further decreased in water samples taken beneath the shrub and herb stratums. Compared to the rainfall, PAHs in runoff were lost 87 % in composition and 50 % in concentration, respectively. Our results demonstrate that the Camphor forest ecosystems have a strong ability for purifying PAHs that are known to be hazardous substances in the environment.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第6期1882-1888,共7页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(30571487
30271043)
国家科技部平台建设资助项目(20021220)
国家林业局重点资助项目(2001-07
2004-163
2005-203)~~
