| 百年来滇池沉积物中不同形态氮分布及埋藏特征 |
| 摘要点击 3538 全文点击 1256 投稿时间：2016-05-30 修订日期：2016-09-03 |
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| 中文关键词 滇池 沉积物 沉积速率 氮污染 氮埋藏 |
| 英文关键词 Danchi Lake sediment burial rate nitrogen pollution nitrogen bury |
| 作者 | 单位 | E-mail | | 吴亚林 | 南京师范大学地理科学学院, 南京 210023 | wylcdut@163.com | | 李帅东 | 南京师范大学地理科学学院, 南京 210023 | | | 江俊武 | 南京师范大学地理科学学院, 南京 210023 | | | 沈胤胤 | 南京师范大学地理科学学院, 南京 210023 | | | 黄昌春 | 南京师范大学地理科学学院, 南京 210023
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 | huangchangchun@njnu.edu.cn | | 黄涛 | 南京师范大学地理科学学院, 南京 210023 | huangtao198698@126.com | | 杨浩 | 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 |
| 为探讨百年来滇池沉积物氮的组成、分布以及埋藏特征，2014年7月在滇池采集6根沉积柱进行氮形态及年代测定.结果表明滇池沉积物总氮含量高，为1263.68~7155.17 mg·kg-1，硝氮及氨氮含量低，分别为10.00~144.00 mg·kg-1和9.20~146.50 mg·kg-1.沉积物中有机氮为主要存在形态，含量为255.80~5644.25 mg·kg-1，平均占总氮含量的91.26%；滇池沉积物总氮污染严重，于70年代开始形成且90年代后期加剧，并呈现滇池南部 > 北部 > 中部的分布特征；近100年来滇池沉积物平均沉积速率为0.092~0.187 g·（cm2·a）-1，随时间先增加后降低再升高，空间上由北向南逐渐降低.沉积物中总氮埋藏速率则随时间逐渐增加，在1990年后几乎呈直线增长，且由南向北逐渐降低；据估算，1900~2014年滇池沉积物总氮埋藏量达92139.15 t，其中有机氮埋藏量为86745.62 t，硝氮埋藏量为2464.16 t，氨氮埋藏量为2929.37 t. |
| 英文摘要 |
| In order to analyze the composition, distribution and burial characteristics of nitrogen in sediments of Dianchi Lake in the last hundred years, 6 sediment cores were sampled in July 2014 to determine the contents of different nitrogen species and sedimentary age sequence. The integrated results demonstrated a high content of total nitrogen in sediments ranging from 1263.68-7155.17 mg·kg-1. The contents of nitrate nitrogen and ammonium nitrogen were low, which were 10.00-144.00 mg·kg-1and 9.20-146.50 mg·kg-1, respectively. Organic nitrogen was the main component in the sediments, ranging from 255.80 to 5644.25 mg·kg-1, composing a large average percentage of 91.26%. In addition, the nitrogen pollution of sediment in Dianchi Lake has reached a high level and is becoming serious since 1970s, which surged in the late 1990s. The spatial difference of total nitrogen was obvious, with comparably the most in the south, less in the north and least in the center. The average deposition rate was changing from 0.092 g·(cm2·a)-1 to 0.187 g·(cm2·a)-1 in the last 100 years and increased first, then declined, finally showed a slight upward trend over time. The burial rate of total nitrogen in sediment increased over time and almost grew up straightly after 1990,which decreased from the south to the north of Dianchi Lake in space. It was estimated that the reserves of total nitrogen, organic nitrogen, nitrate nitrogen, ammonium nitrogen in the sediment were 92139.15 t, 86745.62 t, 2464.16 t, 2929.37 t, respectively, from 1900 to 2014. |
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