百年来滇池沉积物中不同形态氮分布及埋藏特征

发布时间：2018-01-09 23:23

本文关键词：百年来滇池沉积物中不同形态氮分布及埋藏特征?　出处：《环境科学》2017年02期 　论文类型：期刊论文

【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1 263.68~7 155.17 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255.80~5 644.25 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·(cm~2·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92 139.15 t,其中有机氮埋藏量为86 745.62 t,硝氮埋藏量为2 464.16 t,氨氮埋藏量为2 929.37 t.
[Abstract]:In order to study the composition, distribution and burial characteristics of nitrogen in sediment of Dianchi Lake in recent 100 years, 6 sediment columns were collected in July 2014 for nitrogen morphology and dating. The results show that the total nitrogen content in sediment of Dianchi Lake is high. The content of nitrate and ammonia was low, and it was 1 263.68 ~ 7 155.17 mg 路kg ~ (-1) ~ (-1) 路kg ~ (-1) 路kg ~ (-1) ~ (-1). The concentrations of organic nitrogen in sediments were 10.00 mg 路kg ~ (-1) and 9.20 ~ (14. 50 mg 路kg ~ (-1) ~ (-1)), respectively. The average content of total nitrogen was 91.26mg 路kg ~ (-1) ~ (-1) ~ 255.80 ~ 5644.25 mg 路kg ~ (-1) ~ (-1); The total nitrogen pollution in the sediments of Dianchi Lake was serious, which began to form in 70s and intensified in the later period of 90s, and showed the distribution characteristics of the northern and central part of Dianchi Lake. In the last 100 years, the average sedimentation rate of Dianchi Lake sediment is 0.092 ~ 0.187 g 路m ~ (2) 路a ~ (-1) ~ (-1), which increases at first and then decreases and then increases with time. From north to south, the burial rate of total nitrogen in sediment gradually increased with time, almost linearly increased after 1990, and gradually decreased from south to north. It is estimated that the total nitrogen burial capacity of Dianchi Lake sediments from 1900 to 2014 is 92 139.15 t, of which the organic nitrogen burial capacity is 86 745.62 t. The buried amount of nitrate and ammonia is 2 464.16 t and 2 929.37 t respectively.
【作者单位】：南京师范大学地理科学学院;江苏省地理信息资源开发与利用协同创新中心;江苏省物质循环与污染控制重点实验室;云南省环境科学研究院中国昆明高原湖泊国际研究中心;
【基金】：国家自然科学基金项目(41571324);国家自然科学基金青年科学基金项目(41503075) 中国博士后科学基金项目(2015M581826) 云南省环境科学研究院(中国昆明高原湖泊国际研究中心)开放基金项目
【分类号】：X524
【正文快照】： 昆明650000)沉积物是湖泊营养盐的重要储蓄库[1],在整个湖泊的氮循环中起着至关重要的作用.氮元素是造成湖泊水体富营养化的重要限制性因子,显著影响着湖泊生态系统的生产力水平,已成为国际全球变化问题研究的热点之一[2~4].湖泊沉积物氮具有多种存在形态,不同氮存在形态表现

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