DOI: 10.1016/j.watres.2018.05.040
Scopus记录号: 2-s2.0-85047956123
论文题名: Nitrate and phosphorus transport through subsurface drains under free and controlled drainage
作者: Saadat S. ; Bowling L. ; Frankenberger J. ; Kladivko E.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 142 起始页码: 196
结束页码: 207
语种: 英语
英文关键词: ANCOVA
; ARMA errors
; Drainage water management
; Nitrate
; Phosphorus
; Subsurface drain
Scopus关键词: Nitrates
; Phosphorus
; Water management
; Water quality
; ANCOVA
; Conservation practices
; Drainage water management
; Management practices
; Phosphorus transport
; Soluble reactive phosphorus
; Subsurface drains
; Water quality impact
; Quality control
; nitrate
; phosphorus
; agricultural runoff
; drain
; drainage
; error analysis
; monitoring system
; nitrate
; phosphorus
; transport process
; water management
; water quality
; Article
; controlled study
; fertilizer application
; measurement error
; nutrient concentration
; priority journal
; rank sum test
; seasonal variation
; statistical analysis
; surface property
; water quality
; water sampling
; water supply
; water table management
; Indiana
; United States
英文摘要: Controlled drainage (CD) is a structural conservation practice in which the drainage outlet is managed in order to reduce drain flow volume and nutrient loads to water bodies. The goal of this study was to evaluate the potential of CD to improve water quality for two different seasons and levels of outlet control, using ten years of data collected from an agricultural drained field in eastern Indiana with two sets of paired plots. The Rank Sum test was used to quantify the impact of CD on cumulative annual drain flow and nitrate-N and phosphorus loads. CD plots had a statistically significant (at 5% level) lower annual drain flow (eastern pair: 39%; western pair: 25%) and nitrate load (eastern pair: 43%; western pair: 26%) compared to free draining (FD) plots, while annual soluble reactive phosphorus (SRP) and total phosphorus (TP) loads were not significantly different. An ANCOVA model was used to evaluate the impact of CD on daily drain flow, nitrate-N, SRP and TP concentrations and loads during the two different periods of control. The average percent reduction of daily drain flow was 68% in the eastern pair and 58% in the western pair during controlled drainage at the higher outlet level (winter) and 64% and 58% at the lower outlet level (summer) in the eastern and western pairs, respectively. Nitrate load reduction was similar to drain flow reduction, while the effect of CD on SRP and TP loads was not significant except for the increase in SRP in one pair. These results from a decade-long field monitoring and two different statistical methods enhance our knowledge about water quality impacts of CD system and support this management practice as a reliable system for reducing nitrate loss through subsurface drains, mainly caused by flow reduction. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112606
Appears in Collections: 气候减缓与适应
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作者单位: Dept. of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, United States; Dept. of Agronomy, Purdue University, West Lafayette, IN 47907, United States
Recommended Citation:
Saadat S.,Bowling L.,Frankenberger J.,et al. Nitrate and phosphorus transport through subsurface drains under free and controlled drainage[J]. Water Research,2018-01-01,142