段丹丹;李海燕;郑太辉;黄文;杨余;冉勇;

• 1:中国科学院广州地球化学研究所
• 2:中国科学院大学

摘要(Abstract)：

氢指数(HI)是重要的有机质评价参数,能够反映沉积有机质中脂肪大分子物质的相对含量,并用于反演水生生态系统的历史初级生产力,有助于研究藻类生产力对污染物的富集作用。为了探讨氢指数的环境指示作用,选择了亚热带的3座水库作为研究对象,采用Rock-Eval热解与生物标志物-中性糖方法相结合的研究技术,研究了沉积钻孔有机质的来源与特征;并结合210Pb和137Cs定年技术,综合运用氢指数和总糖含量对水库的初级生产力进行了重建。结果表明:中富营养的增塘和联安水库沉积有机质主要来源于浮游藻类,且受降解的程度较小,而贫营养的新丰江水库钻孔下层有机质主要是受降解作用或陆源高等植物等的影响。近年来,3个水库的HI值都有显著性的增加,且与其对应的总糖含量以及近50年来的滑动平均温度都高度的相关,说明这些水库都经历了气候变暖所引起的初级生产力增长。同时,升高的水库生产力扩大了沉积物剖面中重金属和多环芳烃的累积。

关键词(KeyWords)： 亚热带水库;沉积有机质;氢指数;中性糖;气候变化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金-广东省联合基金(U1201235)资助

作者(Author): 段丹丹;李海燕;郑太辉;黄文;杨余;冉勇;

Email:

DOI:

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