干旱区生态环境知识资源中心(Arid): Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed

Arid

DOI	10.1016/j.scitotenv.2021.148382
	Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed
	Mihiranga, H. K. M.; Jiang, Yan; Li, Xuyong; Wang, Wei; De Silva, Koshila; Kumwimba, Mathieu Nsenga; Bao, Xin; Nissanka, S. P.
通讯作者	Jiang, Y (corresponding author), Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	791
英文摘要	Seasonal rainfall events reinforce the link between terrestrial and fluvial domains and are crucial for assessing hydrological control over riverine nutrient dynamics and pollutant source behaviors, especially in a semi-arid watershed. Taking the Qingshuihe river basin, a semi-arid mountainous basin in China, as an example, this paper investigated storm effects on riverine nitrogen (N) and phosphorus (P) dynamics (i.e. concentration, load, and composition changes) through continuous sampling of four storm events of the 2019 rainy season, including one small storm, two moderate storms, and a large storm. Pollutant sources and transport pathways were then examined over the storm sequence via hysteresis analysis. The results revealed a strong linkage between N/P dynamics and hydrological processes. Storm runoff caused a 6-fold increase in particulate-P (PP) and a 4-fold increase in ammonia-N (NH4-N) fluxes through four storms (most sensitive nutrients to storms). On average, PP shared 86% of P exports, and nitrate-N (NO3-N) contributed 79% of N exports. PP and NH4-N were delivered primarily from overland sources and transported by surface runoff. Nonetheless, mobilization of channel sediment reserves was also an important way of PP supply during storms. The results suggested groundwater as the principal NO3-N source in the watershed, and subsurface flow was important for NO3-N and total dissolved-P (TDP) delivery during storms. The large storm (>20 mm) often registered the highest N/P load exports. However, there were other influencing factors/processes on stormflow N/P dynamics in the semi-arid watershed, which complicate/override the effects of different storm magnitudes. Total suspended solids (TSS)/PP source availability and inter-and intra-storm export trends influenced P behaviors through storms. Moreover, impacts of mobilization processes on NO3-N behavior appeared over the storm sequence. These findings enhance our understanding of storm events induced N/P exports in water-scarce regions and provide references for water quality predictions and control in flood seasons. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Storm events N and P dynamics Hysteresis analysis Semi-arid mountainous watershed
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000686018500011
WOS关键词	2 LOWLAND STREAMS ; AGRICULTURAL WATERSHEDS ; SUSPENDED SEDIMENT ; PHYSICOCHEMICAL CONTROLS ; PHOSPHORUS DYNAMICS ; HYSTERESIS ANALYSIS ; RIVER ; NUTRIENT ; CATCHMENT ; NITRATE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368294
作者单位	[Mihiranga, H. K. M.; Jiang, Yan; Li, Xuyong; Wang, Wei; De Silva, Koshila; Kumwimba, Mathieu Nsenga; Bao, Xin] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China; [Mihiranga, H. K. M.; Jiang, Yan; Li, Xuyong; Wang, Wei; De Silva, Koshila; Kumwimba, Mathieu Nsenga; Bao, Xin] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Kumwimba, Mathieu Nsenga] Univ Lubumbashi, Fac Agron, Lubumbashi, DEM REP CONGO; [Nissanka, S. P.] Univ Peradeniya, Fac Agr, Dept Crop Sci, Peradeniya, Sri Lanka
推荐引用方式 GB/T 7714	Mihiranga, H. K. M.,Jiang, Yan,Li, Xuyong,et al. Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed[J],2021,791.
APA	Mihiranga, H. K. M..,Jiang, Yan.,Li, Xuyong.,Wang, Wei.,De Silva, Koshila.,...&Nissanka, S. P..(2021).Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed.SCIENCE OF THE TOTAL ENVIRONMENT,791.
MLA	Mihiranga, H. K. M.,et al."Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed".SCIENCE OF THE TOTAL ENVIRONMENT 791(2021).