Seasonal variation of potential denitrification rates of surface sediment from
Meiliang Bay, Taihu Lake, China |
| |
Authors: | Jicheng Zhong Chengxin Fan Guofeng Liu Lei Zhang Jingge Shang and Xiaozhi Gu |
| |
Institution: | State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences,Nanjing 210008, China |
| |
Abstract: | The regulatory e ects of environmental factors on denitrification were studied in the sediments of Meiliang Bay, Taihu Lake, in a
monthly sampling campaign over a one-year period. Denitrification rates were measured in slurries of field samples and enrichment
experiments using the acetylene inhibition technique. Sediment denitrification rates in inner bay and outer bay ranged from 2.8 to 51.5
nmol N2/(g dw (dry weight) hr) and from 1.5 to 81.1 nmol N2/(g dw hr), respectively. Sediment denitrification rates were greatest
in the spring and lowest in the summer and early autumn, due primarily to seasonal di erences in nitrate concentration and water
temperature. For each site, positive and linear relationships were regularly observed between denitrification rate and water column
nitrate concentration. Of various environmental factors on denitrification that we assessed, nitrate was determined to be the key factor
limiting denitrification rates in the sediments of Meiliang Bay. In addition, at the two sites denitrification rates were also regulated by
temperature. The addition of organic substrates had no significant e ect on denitrification rate, indicating that sediment denitrification
was not limited by organic carbon availability in the sediments. Nitrate in the water column was depleted during summer and early
autumn, and this suppressed e ective removal of nitrogen from Taihu Lake by denitrification. |
| |
Keywords: | denitrification sediment environmental factors Taihu Lake |
本文献已被 CNKI 万方数据 ScienceDirect PubMed 等数据库收录! |
| 点击此处可从《环境科学学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《环境科学学报(英文版)》下载免费的PDF全文 |
|