Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water

doi:10.1016/j.jenvman.2021.113376

	Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water
	Liao, Anran 1,2; Han, Dongmei 1,2,3; Song, Xianfang 1,2,3; Yang, Shengtian 4
刊名	JOURNAL OF ENVIRONMENTAL MANAGEMENT
	2021-11-01
卷号	297 页码:12
关键词	Chlorophyll-a Algal bloom Storm event Temperature Reclaimed water
ISSN号	0301-4797
DOI	10.1016/j.jenvman.2021.113376
通讯作者	Han, Dongmei(handm@igsnrr.ac.cn)
英文摘要	Harmful algal bloom is prevalent in the reclaimed-water-source (RWS) river caused by the excessive nutrient's inputs. Rainfall water may be the sole nutrient-diluted water source for the RWS river. However, the effects of storm events on the algal bloom in the RWS river are poorly understood. This study presents chlorophyll-a (Chla) variations before, during, and after the initial storm events (Pre-storm, In-storm, and Post-storm) at four representative sites with distinct hydraulic conditions in a dam-regulated RWS river system, Beijing. The response of Chl-a to the initial storm events mostly depends on the ecosystem status that caused by the river hydraulic properties. The upstream is more river-like and downstream is more lake-like. In the river-like system, elevated water temperature (WT, increased by 2 %) could support the dominating algae (diatom) growth (Chl-a increased by 130 %) from Pre-storm to In-storm period. In the lake-like system, the dominant algae (blue algae) declined (Chl-a sharply decreased by 96%-99 %) due to the lower WT (decreased by 3%-7%) and increased flow velocities from Pre-storm to In-storm period. During the Post-storm period, the dominant algae break out (Chl-a surged by 20%-319 %) in the lake-like system caused by the recovered WT (increased by 3%-6%) and flow velocity. The occurrence of algal bloom can be predicted by the Random Forest (RF) model based on water quality parameters such as total nitrogen (TN). The thresholds of algal bloom for the Pre-storm, In-storm, and Post-storm periods were identified as 30 mu g/L, 10 mu g/L, and 10 mu g/L, respectively. The two driven factors were WT and nitrate (NO3-N) for the Pre-storm period and were WT and TN for the In- & Post-storm periods. A higher risk of algal bloom is highlighted during the initial storm events in the RWS river. We propose recommendations for improving water quality in the RWS river systems under the climatic change.
资助项目	National Natural Science Foundation of China, China[41730749] ; Beijing Municipal Natural Science Foundation, China[8212035]
WOS关键词	CHAOBAI RIVER ; COMMUNITY COMPOSITION ; RELATIVE IMPORTANCE ; URBAN RIVER ; INTAKE AREA ; LAKE TAIHU ; PHYTOPLANKTON ; NUTRIENT ; RESERVOIR ; TEMPERATURE
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
WOS记录号	WOS:000691273600007
资助机构	National Natural Science Foundation of China, China ; Beijing Municipal Natural Science Foundation, China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/165011]
专题	中国科学院地理科学与资源研究所
通讯作者	Han, Dongmei
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 3.Univ Chinese Acad Sci UCAS, Sino Danish Coll SDC, Beijing 100049, Peoples R China 4.Beijing Normal Univ, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Liao, Anran,Han, Dongmei,Song, Xianfang,et al. Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2021,297:12.
APA	Liao, Anran,Han, Dongmei,Song, Xianfang,&Yang, Shengtian.(2021).Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water.JOURNAL OF ENVIRONMENTAL MANAGEMENT,297,12.
MLA	Liao, Anran,et al."Impacts of storm events on chlorophyll-a variations and controlling factors for algal bloom in a river receiving reclaimed water".JOURNAL OF ENVIRONMENTAL MANAGEMENT 297(2021):12.