Sediment denitrification in Yangtze lakes is mainly influenced by environmental conditions but not biological communities

The Science of the Total Environment
Wenzhi LiuGuihua Liu

Abstract

Globally, shallow lakes have suffered from excessive nitrogen (N) loading due to increased human activities in catchments, resulting in water quality degradation and aquatic biodiversity loss. Sediment denitrification, which reduces nitrate (NO3-) to N gaseous products, is the most important mechanism for permanent N removal in freshwater lakes. However, the relative contribution of abiotic and biotic factors to the sediment denitrification is highly variable. Here, we determined the unamended denitrification rate and nitrous oxide (N2O) production rate of 74 sediment samples from 22 eutrophic lakes in the Yangtze River basin. We also quantified the diversity and abundance of denitrifying communities using nirK and nirS genes. The results of variance partitioning analyses showed that water physicochemical properties (e.g., dissolved oxygen) and nutrients (e.g., NO3- concentration) but not denitrifier communities and submerged vegetation were the major factor groups predicting denitrification and N2O production rates. Path analyses further revealed that water physicochemical properties and nutrients could affect denitrification and N2O production rates both directly and indirectly, and the direct effects were considerably higher...Continue Reading

Citations

Feb 20, 2019·Environmental Science and Pollution Research International·Pan FanJing-Chan Zhao
Sep 6, 2020·The Science of the Total Environment·Sabina RakhimbekovaClare E Robinson
Dec 29, 2020·The Science of the Total Environment·Shan ZhaoLeimin Yang
Oct 12, 2020·The Science of the Total Environment·Haoping WuWei Xing
Jul 27, 2018·The Science of the Total Environment·Shan HuangPeter R Jaffé
Apr 13, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhang DanYuan Xingzhong

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