DEPOSITIONAL RECORDS OF ENVIRONMENTAL EVOLUTION DURING THE RECENT 150 YEARS IN THE INTERTIDAL ZONE OF LONGMEN ISLAND, GUANGXI PROVINCE
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摘要: 在广西龙门岛潮间带取得了长度为97 cm的LM01柱,在210Pb定年的基础上对沉积物的粒度、生源要素(TOC、TN、TP)、油类以及重金属(Hg、Cu、Pb、Zn、Cd、Cr和As)等指标进行了综合分析。研究发现,潮间带沉积物的粒度在近60年来有明显的"细化"趋势;各种污染要素的含量在近30年来也急剧增加,但仅Cu和营养盐在近期轻微超标。C/N比值揭示了近70年来陆源有机质的贡献量逐年减少的原因,可能与潮间带红树林系统的衰退有关。龙门岛潮间带近150年来的环境演变主要分为两个阶段:即20世纪70年代末以前、70年代末至今,龙门岛潮间带分别经历了未污染期和轻度污染期。Abstract: A sediment Core LM01 was collected in May, 2007 from the intertidal zone of the Longmen Island, Guangxi province. Grain size, biogenic elements (TOC, TN and TP)and heavy metals (Hg, Cu, Pb, Zn, Cd, Cr, As)were analyzed for the core sediment in order to study the environmental evolution in the recent 150 years. Vertical grain size distribution shows a finer trend upwards from 40 cm in depth, indicating the decrease in sedimentary dynamics in the recent 60 years. Enrichment factors indicated that natural inputs prevailed up to the late 1970s, and since then the excess fluxes of heavy metals have showed a consistently increasing trend. The molar C/N ratio revealed that terrigenous organic matters decrease toward the surface, due to the decreases in mangrove forest by human activities recently. Integrated from all indicators, the environmental evolution of the Longmen Island in the recent 150 years can be divided into two stages:(1)before the 1970s, it was characterized by the relatively low heavy metal pollution and scarce eutrophication; (2)after the 1970s, the concentrations of heavy metals, total phosphorus and oil-related organic matters increase significantly, indicating the anthropogenic impact.
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Key words:
- heavy metals /
- biogenic elements /
- environmental evolution /
- intertidal zone /
- Longmen Island
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