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通过研究辽河口芦苇湿地土壤有机碳、石油类、阴离子表面活性剂(LAS)、多环芳烃(PAHs)及脂肪酸的垂直分布特征,探讨了不同来源有机物在芦苇湿地的埋藏和降解规律。土壤样品采集于2009年3月,研究发现,有机碳含量范围为0.3%～9.3%,石油烃含量范围为19.04～482.31mg/kg(干重)之间,LAS含量范围为0.84～19.28mg/kg(干重),PAHs含量范围为2.59～4.40mg/kg(干重),总脂肪酸含量范围为5.72～190.69mg/kg(干重)。表层有机碳含量丰富,来源广泛。辽河油田不同年代的采油环保措施可能是芦苇湿地土壤中石油类聚集量多寡的主要因素,芦苇根际的调控调节作用和微生物的选择性降解也对土壤石油类化合物分布起到重要作用。LAS含量从土壤表层向下迅速降低了67.0%,是所研究有机物中降解最迅速的一种。PAHs自表层至底层没有明显的变化趋势。细菌是辽河芦苇湿地土壤有机碳再生产的主要承担者,在次表层以下,细菌生产所利用的有机碳主要来自现场的生产。
Abstract：In order to demonstrate the preservation and degradation of organic matters in the reed wetland,vertical distributions of total organic carbon(TOC),oil,linear alkylbenzene sulfonates(LAS),PAHs and fatty acids(FAs) in the soil were studies in the Liaohe Estuary in March,2009.The TOC,oil,LAS,PAHs and FAs ranged at 0.39.3 %,19.04~482.31 mg/kg(dry weight),0.84~19.28 mg/kg(dry weight),2.594.40 mg/kg(dry weight) and 5.72~190.69 mg/kg(dry weight),respectively.The TOC varied and originated from multiple sources.The development on waste treatment helped to decrease the oil aggregation in the soil,associated with the transportation by the reed root system and the selective degradation by microorganisms.LAS decreased significantly by 67.0 % from surface to subsurface,which was the most rapid degradation among the detected organic matters,whereas PAHs varied little from surface to bottom.Bacteria played a key role in TOC degradation,preferring the organic matter produced in situ under subsurface layer.
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基本信息:
DOI：10.16441/j.cnki.hdxb.2012.05.005
中图分类号:X131.3
引用信息:
[1]彭溶,邹立,万汉兴,等.辽河口芦苇湿地土壤有机碳的积累特征研究[J].中国海洋大学学报(自然科学版),2012,42(05):28-34.DOI:10.16441/j.cnki.hdxb.2012.05.005.
基金信息:
国家自然科学基金项目(41176064);; 国家水体污染控制与治理科技重大专项(2012ZX07202-007)资助
2012-05-15
2012-05-15