气候变化领域集成服务门户(CCPortal): Evaluating the risk of phosphorus loss with a distributed watershed model featuring zero-order mobilization and first-order delivery

CCPortal

DOI	10.1016/j.scitotenv.2017.07.173
	Evaluating the risk of phosphorus loss with a distributed watershed model featuring zero-order mobilization and first-order delivery
	Li, Sisi; Zhang, Liang; Liu, Hongbin; Loaiciga, Hugo A.; Zhai, Limei; Zhuang, Yanhua; Lei, Qiuliang; Hu, Wanli; Li, Wenchao; Feng, Qi; Du, Yun
发表日期	2017
ISSN	0048-9697
EISSN	1879-1026
卷号	609
英文摘要	Many semi-distributed models that simulate pollutants' losses from watersheds do not handle well detailed spatially distributed and temporal data with which to identify accurate and cost-effective strategies for controlling pollutants issuing from non-point sources. Such models commonly overlook the flow pathways of pollutants across the landscape. This work aims at closing such knowledge gap by developing a Spatially and Temporally Distributed Empirical model for Phosphorus Management (STEM-P) that simulates the daily phosphorus loss from source areas to receiving waters on a spatially-distributed grid-cell basis. STEM-P bypasses the use of complex mechanistic algorithms by representing the phosphorus mobilization and delivery processes with zero-order mobilization and first-order delivery, respectively. STEM-P was applied to a 217 km(2) watershed with mixed forest and agricultural land uses situated in southwestern China. The STEM-P simulation of phosphorus concentration at the watershed outlet approximated the observed data closely: the percent bias (P-bias) was -7.1%, with a Nash-Sutcliffe coefficient (ENS) of 0.80 on a monthly scale for the calibration period. The Pbias was 18.1%, with a monthly ENS equal to 0.72 for validation. The simulation results showed that 76% of the phosphorus loadwas transported with surface runoff, 25.2% of which came from 3.4% of the watershed area (classified as standard A critical source areas), and 55.3% of which originated from 17.1% of the watershed area (classified as standard B critical source areas). The standard A critical source areas were composed of 51% residences, 27% orchards, 18% dry fields, and 4% paddy fields. The standard B critical source areas were mainly paddy fields (81%). The calculated spatial and temporal patterns of phosphorus loss and recorded flow pathways identified with the STEM-P simulations revealed the field-scale critical source areas and guides the design and placement of effective practices for non-point source pollution control and water quality conservation. (C) 2017 Elsevier B.V. All rights reserved.
关键词	Non-point source pollution Phosphorus Mobilization Delivery Critical source areas Flow path
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111909
作者单位	Chinese Acad Sci, Inst Geodesy & Geophys, Wuhan 430077, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Li, Sisi,Zhang, Liang,Liu, Hongbin,et al. Evaluating the risk of phosphorus loss with a distributed watershed model featuring zero-order mobilization and first-order delivery[J]. 中国科学院西北生态环境资源研究院,2017,609.
APA	Li, Sisi.,Zhang, Liang.,Liu, Hongbin.,Loaiciga, Hugo A..,Zhai, Limei.,...&Du, Yun.(2017).Evaluating the risk of phosphorus loss with a distributed watershed model featuring zero-order mobilization and first-order delivery.SCIENCE OF THE TOTAL ENVIRONMENT,609.
MLA	Li, Sisi,et al."Evaluating the risk of phosphorus loss with a distributed watershed model featuring zero-order mobilization and first-order delivery".SCIENCE OF THE TOTAL ENVIRONMENT 609(2017).