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作 者 ：凌婉婷,朱利中,高彦征,熊巍

期 刊 ：生态学报 2005年 25卷 9期 页码：2320~2325

关键词：多环芳烃；土壤；植物吸收；模型；

Keywords:Polycyclic aromatic hydrocarbons （PAHs）, soil, plant uptake, model,

摘 要 ：研究了多种植物根对土壤中多环芳烃(PAHs)的吸收作用,阐述了根系吸收与土壤污染强度、污染物性质、植物组成等的关系,并用实验数据检验了限制分配模型对植物吸收土壤中PAHs的预测性能。供试土壤中菲和芘的起始浓度分别为0~457和0~489mg/kg;45d后,随土壤中菲和芘浓度提高,根中菲和芘含量明显增大,根系富集系数则减小。不同植物根中菲和芘含量和根系富集系数与根的脂肪含量呈显著正相关。由于芘的Kow较大,同种植物根中芘含量、芘的根系富集系数则远大于菲。经45d处理,尽管土壤中菲浓度变化很大(从不足1mg/kg到约45mg/kg),限制分配模型能较好地预测供试植物根中菲的含量,黑麦草和菜心根中菲含量的预测误差低于81%。作为限制分配模型预测植物吸收的关键参数,不同植物根吸收菲的αpt值与根脂肪含量显著正相关。

Abstract:Plant root uptake of phenanthrene and pyrene was evaluated using the data collected from a greenhouse study. Correlations of root uptake with soil contamination levels, physiochemical properties of organic contaminants, and plant compositions were investigated, and the results were used to evaluate a partition-limited model for plant uptake of organic chemicals from soils to plant. Results show that root concentrations of phenanthrene and pyrene dramatically increased with increasing contaminant concentrati...

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