| 滇池沉积物有机质沉积特征与来源解析 |
| 摘要点击 2014 全文点击 821 投稿时间：2016-06-08 修订日期：2016-08-26 |
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| 中文关键词 TOC 正构烷烃 沉积物 沉积通量 来源解析 |
| 英文关键词 TOC n-alkanes sediments sediment fluxes source apportion |
| 作者 | 单位 | E-mail | | 韩秀秀 | 江苏省地理信息资源开发与利用协同创新中心, 南京 210023
江苏省物质循环与污染控制重点实验室, 南京 210023
南京师范大学地理科学学院, 南京 210023 | 18021419609@163.com | | 黄晓虎 | 南京师范大学地理科学学院, 南京 210023 | | | 余丽燕 | 南京师范大学地理科学学院, 南京 210023 | | | 杨浩 | 南京师范大学地理科学学院, 南京 210023 | | | 黄昌春 | 江苏省地理信息资源开发与利用协同创新中心, 南京 210023
江苏省物质循环与污染控制重点实验室, 南京 210023
南京师范大学地理科学学院, 南京 210023 | huangchangchun@njnu.edu.cn | | 黄涛 | 江苏省地理信息资源开发与利用协同创新中心, 南京 210023
江苏省物质循环与污染控制重点实验室, 南京 210023
南京师范大学地理科学学院, 南京 210023 | | | 余艳红 | 云南省环境科学研究院, 中国昆明高原湖泊国际研究中心, 昆明 650000 | | | 罗玉 | 云南省环境科学研究院, 中国昆明高原湖泊国际研究中心, 昆明 650000 | |
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| 中文摘要 |
| 以滇池湖泊东南部和东部沉积柱为研究对象，对沉积柱中不同层的沉积物样品使用210Pb定年，分析不同年代沉积物中总有机碳（TOC）和正构烷烃的含量及沉积通量，利用正构烷烃相关指标示踪有机质来源.结果表明：①两采样点沉积物中TOC含量和沉积通量随时间增长均表现为总体上升的变化趋势；正构烷烃沉积通量随沉积年代的变化，分为上升期、下降期与再次上升期这3个阶段.②正构烷烃与TOC沉积通量均增大时，两者来源具有一致性，均来自于湖泊内部和入湖河流携带的泥沙物质之中；20世纪80年代至20世纪末，正构烷烃沉积通量在减小，TOC沉积通量在增大，说明该时期两者来源存在较大差异，湖泊内的细菌、藻类对正构烷烃的贡献较大，而TOC受湖泊内部与入湖泥沙的影响较大.③两采样点检测到的正构烷烃碳数范围为C12~C35，由正构烷烃基本特征与源解析指标分析得出：挺水植物对滇池湖泊沉积物中有机质来源贡献较大，浅层深度，细菌和藻类的贡献突出. |
| 英文摘要 |
| Sediment columns in the southeast and east of Dianchi Lake were taken as the object of the study to determine ages by 210 Pb dating method.The contents and sediment fluxes of total organic carbon (TOC) and n-alkanes of the sediments were investigated,and organic sources were tracked according to the relevant indexes of n-alkanes.The results indicated that TOC contents and sediment fluxes of two sampling sediments both presented an increasing trend on the whole;Sediment fluxes of n-alkanes varied as three stages:increasing period,decreasing period and re-increasing period.When the sediment fluxes of n-alkanes and TOC both went up,it showed that they had the same sources:sediments in the lake and carried by the rivers;From 1980s to the end of 20th century,sediment fluxes of n-alkanes were going down while those of TOC were going up.This result means there was a big difference in the sources of n-alkanes and TOC.The bacteria and algae in the lake made a great contribution to n-alkanes while TOC was mainly influenced by sediments in the lake and carried by the rivers.n-alkanes of the two sampling sites both ranged from C12 to C35.Based on the basic features and relevant indexes of n-alkanes,we proposed that emergent plants made big contributions to the sources of organic matter in the sediments of Dianchi Lake,simultaneously,bacteria and algae had significant contributions to the sources of organic matter in shallow depth of Dianchi Lake. |
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