首页 | 期刊简介 | 编委会 | 投稿指南 | 常用下载 | 联系我们 | 期刊订阅 | In English
引用本文:吴丰昌,万国江,黄荣贵.云贵高原湖泊沉积物─水界面碱度扩散通量研究.海洋与湖沼,1997,28(1):66-71.
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 1580次   下载 1461 本文二维码信息
码上扫一扫!
分享到: 微信 更多
云贵高原湖泊沉积物─水界面碱度扩散通量研究
吴丰昌, 万国江, 黄荣贵
中国科学院地球化学研究所环境地球化学国家重点实验室 贵阳 550002
摘要:
于1991-1995年间5次在云贵高原泸沽湖、洱海湖和贵州阿哈湖、百花湖的湖心采集沉积物柱芯、界面水和湖水样品,通过其pH值和HCO3-浓度剖面及界面碱度扩散通量的研究,首次定量评估高原湖泊界面扩散作用上覆水体碱度的影响程度。研究结果表明,云贵高原某些湖水寄宿时间相对较长、湖水深度相对小的湖泊,界面扩散作用是水体碱度的重要来源之一;湖水寄宿时间较短、深度较小的湖泊,界面扩散对上覆水体的影响可以忽略不计。
关键词:  扩散通量  碱度  沉积物-水界面  云贵高原湖泊
DOI:
分类号:
基金项目:国家自然科学基金资助项目,49503050和49333040号
附件
STUDY ON ALKALINITY DIFFUSION FLUX AT THE WTERFACE OF SEDIMENT AND WATER OF LAKES FROM YUNGUI PLATEAU, CHINA
Wu Fengchang, Wan Guojiang, Huang Ronggui
State Key Laboratory of Environmental Geochemistry,Instituteof Geochemistry,Chinese Acodmy of Sciences,Guiyang 550002
Abstract:
In 1991 - 1995, sediment was cored and interface water and overlying water are sampled several times in the center area of 4 lakes from southwestern Plateau of China Seasonal profiles of pH value and HCO3- and alkalinity fluxes which had been corrected by using the upward oxidation fluxes of Fe2+ and Mn2+ ions in pore water at the sediment water interface were studied. The extent of the effect of diffusion on the overlying water was calculated quantitatively for the first time. The extent is related to the alkalinity diffusion flux (Ja), the water residence time (Tw), water depth (h) and alkalinity concentration (C) in overlying water. This study showed that there was obvious gradient of many ions such as Fe2+, Mn+, Ca2+, Mg2+, K+, Na+, SO42-, NO3- and HCO3-, and molecular diffusion near the interface, resulting from biogeochemical processes during diagenesis, including sulfate reduction, denitrification, reduction-dissolution of iron, manganese oxidation, decomposition of organic matter, and carbonate dissolution. Upward alkalinity diffusion fluxes from the sediments is an important source to the overlying water in lakes with long residence time and shallow depth. For example, in Lugu Lake, 33% of the alkalinity came from diffusion from deep sediments, but it can be negligible for lakes with short residence time and deep water depth, 10 percent of water alkalinity in Erhai Lake and Baihua Lake, and only 0.52 percent in Aha Lake came from interface diffusion.
Key words:  Diffusion flux, Alkalinity, Sediment-water interface, Lakes of Yungui Plateau
版权所有 海洋与湖沼 Oceanologia et Limnlolgia Sinica Copyright©2008 All Rights Reserved
主管单位:中国科协技术协会 主办单位:中国海洋湖沼学会
地址:青岛市海军路88号  邮编:266400  电话:0532-82898753  E-mail:ols@qdio.ac.cn
技术支持:北京勤云科技发展有限公司