Algal Accumulation Decreases Sediment Nitrogen Removal by Uncoupling Nitrification-Denitrification in Shallow Eutrophic Lakes

	Algal Accumulation Decreases Sediment Nitrogen Removal by Uncoupling Nitrification-Denitrification in Shallow Eutrophic Lakes
	Zhu, Lin; Shi, Wenqing; Van Dam, Bryce; Kong, Lingwei; Yu, Jianghua; Qin, Boqiang
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2020
卷号	54 期号:10 页码:6194-6201
英文摘要	In eutrophic lakes, the decay of settled algal biomass generates organic carbon and consumes oxygen, favoring sediment nitrogen loss via denitrification. However, persistent winds can cause algae to accumulate into dense mats, with uncertain impacts on sediment nitrogen removal. In this study, we investigated the effects of algal accumulation on sediment nitrogen removal in a shallow and eutrophic Chinese lake, Taihu. We found that experimental treatments of increased algal accumulation were associated with decreased sediment nitrogen losses, indicating the potential for a break in coupled nitrification-denitrification. Likewise, field measurements indicated similar decreases in sediment nitrogen losses when algal accumulation occurred. It is possibly caused by the decay of excess algal biomass, which likely depleted dissolved oxygen, and could have inhibited nitrification and thereby denitrification in sediments. We estimate that if such algal accumulations occurred over 20% or 10% of lake area in Taihu, sediment nitrogen removal rates decreased from 835.6 to 167.2 and 77.2 mu mol N m(-2) h(-1), respectively, during algal accumulation period. While nitrogen removal may recover later, the apparent nitrogen removal decrease may create a window for algal proliferation and intensification. This study advances our knowledge on the impacts of algal blooms on nitrogen removal in shallow eutrophic lakes.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20243]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Zhu, Lin,Shi, Wenqing,Van Dam, Bryce,et al. Algal Accumulation Decreases Sediment Nitrogen Removal by Uncoupling Nitrification-Denitrification in Shallow Eutrophic Lakes[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(10):6194-6201.
APA	Zhu, Lin,Shi, Wenqing,Van Dam, Bryce,Kong, Lingwei,Yu, Jianghua,&Qin, Boqiang.(2020).Algal Accumulation Decreases Sediment Nitrogen Removal by Uncoupling Nitrification-Denitrification in Shallow Eutrophic Lakes.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(10),6194-6201.
MLA	Zhu, Lin,et al."Algal Accumulation Decreases Sediment Nitrogen Removal by Uncoupling Nitrification-Denitrification in Shallow Eutrophic Lakes".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.10(2020):6194-6201.