Denitrification and the controlling factors in Yunnan Plateau Lakes(China): Exploring the role of enhanced internal nitrogen cycling by algal blooms

论文摘要

Denitrification plays an important role in nitrogen(N) removal in freshwater ecosystems.This internal process regulates the fluctuations of N concentration, especially for lakes with high nutrients concentrations and long residence time. Lakes in Yunnan plateau(southwestern China) provide typical cases, while studies in this region have been rare.Therefore, we studied denitrification of two lakes(Lake Dianchi in hypereutrophic state and Lake Erhai in mesotrophic) in this region. We used acetylene inhibition technique to quantify potential denitrification rate(PDR) of these lakes in April and August, 2015 and 2016. PDR of the sediments ranged 0–1.21 μmol/(N·m~2·hr), and that of overlying water ranged 0–0.24 μmol/(N·L·hr). Then, we used Least Angle Regression to determine the controlling factors for denitrification. Nutrients controlled PDR from two aspects: providing essential nitrogen sources; and affecting the richness and metabolism of denitrifying bacteria. In April, both aspects limited PDR; while only nitrogen sources limited PDR in August, due to depleted nitrate and enhanced denitrifying bacteria activity. Ammonia was most significant to denitrification, indicating that nitrate from nitrification transported to the bottom of wellmixed lake provide major N source by denitrification. The high PDR and low nitrate concentrate in August were evidence of an enhanced internal N cycling by algal blooms.

论文目录

文章来源

类型: 期刊论文

作者: Sifeng Wu,Zhen Wu,Zhongyao Liang,Yong Liu,Yilin Wang

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: College of Environmental Sciences and Engineering,Key Laboratory of Water and Sediment Sciences (MOE),Peking University,College of Environmental Sciences and Engineering,Key Laboratory of Water and Sediment Sciences(MOE),Peking University

基金: supported by the National Basic Research Program (973) of China (No.2015CB458900),the National Natural Science Foundation of China (No.51779002)

分类号: X524

页码: 349-358

总页数: 10

文件大小: 288K

下载量: 29

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