College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2012;47(2):319-25. doi: 10.1080/10934529.2012.640912.
Microbial respiration is considered to be one of the most sensitive factors in soil; however, it might be altered by soil pollution. To clarify the potential impact of low levels of total petroleum hydrocarbons (TPHs) on soil microbial respiration (SMR) in tidal wetland in Jiuduansha, Shanghai, the distribution and characteristics of TPHs in the typical zones of the Jiuduansha Wetland and nearby watershed were analyzed, and the relationship between soil microbial respiration and TPH was studied. The results showed that the average concentration of TPHs in the soil was 23.98 mg·kg(-1), which was a relatively low pollution level. Moreover, the concentration of TPHs in the soil changed significantly with tidal elevation. The main petroleum pollutants in the soil were alkane and aromatic hydrocarbons with less than 10 carbons. The average concentration of TPHs of the surrounding watershed of Jiuduansha was about 0.26 mg·L(-1), indicating that it was grade III seawater. The concentration of the inner watershed was higher than that of the outer watershed, indicating that Jiuduansha wetland could enrich TPHs to some extent. Based on the results of regression analysis and a pot experiment, there was a relationship between TPHs and soil microbial respiration. The input of TPHs from the surrounding watershed over long term periods might improve the SMR of the Jiuduansha tidal wetland.
微生物呼吸被认为是土壤中最敏感的因素之一；然而，它可能会被土壤污染所改变。为了阐明低水平的总石油烃（TPHs）对上海九段沙潮汐湿地土壤微生物呼吸（SMR）的潜在影响，分析了九段沙湿地及其附近流域典型区域 TPHs 的分布和特征，并研究了土壤微生物呼吸与 TPH 的关系。结果表明，土壤中 TPHs 的平均浓度为 23.98mg·kg(-1)，属于相对较低的污染水平。此外，土壤中 TPHs 的浓度随潮汐高程变化显著。土壤中的主要石油污染物是烷烃和芳香烃，碳原子数小于 10。九段沙周边流域的 TPHs 平均浓度约为 0.26mg·L(-1)，表明其为 III 类海水。内流域的浓度高于外流域，表明九段沙湿地在一定程度上可以富集 TPHs。基于回归分析和盆栽实验的结果，TPHs 与土壤微生物呼吸之间存在一定的关系。长期来自周边流域的 TPHs 的输入可能会提高九段沙潮汐湿地的 SMR。
