Comprehensive analysis of nitrogen distributions and ammonia nitrogen release fluxes in the sediments of Baiyangdian Lake, China

论文摘要

The condition of Baiyangdian Lake（BYDL） will improve as the Xiongan New Area evolves and fulfills its role of easing overcrowding and supporting economic growth. Water and sediment samples from BYDL were analyzed to provide information on nitrogen（N） contamination in BYDL. The mean ammonium N（NH4+-N）, nitrate N, and total N concentrations in the water samples were 0.36, 0.12, and 2.22 mg/L, respectively, and the ranges were 0.003–8.38, 0.06–0.30,and 1.25–10.34 mg/L, respectively. The N concentrations in water gradually increased from the north to the south of BYDL. Sediment at 90% of the sampling sites was in or above the moderately contaminated class（1000–2000 mg/kg） defined in US Environmental Protection Agency total N pollution standards. Positive NH4+-N fluxes were found for 28 of the 34 sediment core samples, so the potential for NH4+-N being released from sediment was relatively high. The NH4+-N fluxes were 5.35–48.76 mg/m2/day, and the mean and maximum fluxes were 8.71 and 48.76 mg/m2/day, respectively. Benthic organisms will be affected more by NH4+-N and NH3·H2O in the surface sediment pore water（mean concentrations 4.93 and 0.13 mg/L, respectively） than by the other forms of N.

论文目录

• Introduction
• 1. Materials and methods
•   1.1. Study area and sampling
•   1.2. Methods of N analysis
•   1.3. Calculating the NH4+-N flux and the un-ionized ammonia concentration
•   1.4. Benthic invertebrate community
•   1.5. Statistical analysis
• 2. Results and discussion
•   2.1. N distribution in the BYDL sediments
•   2.2. Release of NH4+-N from the sediments in BYDL
•   2.3. Effects of N on benthic invertebrate communities in the BYDL sediments
• 3. Conclusions

文章来源

类型: 期刊论文

作者: Yaoyao Zhu,Xin Jin,Wenzhong Tang,Xin Meng,Baoqing Shan

来源: Journal of Environmental Sciences 2019年02期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,University of Chinese Academy of Sciences

基金: supported by the Youth Innovation Promotion Association CAS (No.2017059,Wenzhong Tang),the special fund of the State Key Joint Laboratory of Environment Simulation and Pollution Control (No.17L02ESPC),the Public Service Special Project of the Environmental Protection Ministry of China (No.201509027)

分类号: X524

页码: 319-328

总页数: 10

文件大小: 898K

下载量: 72