DOI: 10.1016/j.watres.2018.11.074
Scopus记录号: 2-s2.0-85059555337
论文题名: Do reductions in agricultural field drainage during the growing season impact bacterial densities and loads in small tile-fed watersheds?
作者: Wilkes G. ; Sunohara M.D. ; Topp E. ; Gottschall N. ; Craiovan E. ; Frey S.K. ; Lapen D.R.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 423
结束页码: 438
语种: 英语
英文关键词: Agriculture
; Drainage water management
; Fecal indicator bacteria
; Tile drainage
; Watershed
Scopus关键词: Agriculture
; Catchments
; Cultivation
; Decision making
; Escherichia coli
; Nutrients
; Reservoirs (water)
; River pollution
; Surface testing
; Water management
; Watersheds
; Waterworks
; Before-after control impacts
; Beneficial management practices
; Clostridium perfringens
; Drainage water management
; Fecal indicator bacteria
; Most probable number
; Subsurface tile drainage
; Tile drainage
; Surface waters
; rain
; surface water
; agricultural land
; bacterium
; best management practice
; catchment
; decision making
; drainage water
; growing season
; surface water
; tile drain
; water pollution
; water quality
; watershed
; Article
; autumn
; bacterial load
; Clostridium perfringens
; Enterococcus
; Escherichia coli
; fecal coliform
; growing season
; land use
; maize
; nonhuman
; priority journal
; ruminant
; soybean
; water management
; water supply
; watershed
; weather
; Bacteria (microorganisms)
; Clostridium perfringens
; Enterococcus
英文摘要: Predicting bacterial levels in watersheds in response to agricultural beneficial management practices (BMPs) requires understanding the germane processes at both the watershed and field scale. Controlling subsurface tile drainage (CTD) is a highly effective BMP at reducing nutrient losses from fields, and watersheds when employed en masse, but little work has been conducted on CTD effects on bacterial loads and densities in a watershed context. This study compared fecal indicator bacteria (FIB) [E. coli, Enterococcus, Fecal coliform, Total coliform, Clostridium perfringens] densities and unit area loads (UAL) from a pair of flat tile-drained watersheds (∼250–467 ha catchment areas) during the growing season over a 10−year monitoring period, using a before-after-control-impact (BACI) design (i.e., test CTD watershed vs. reference uncontrolled tile drainage (UCTD) watershed during a pre CTD intervention period and a CTD-intervention period where the test CTD watershed had CTD deployed on over 80% of the fields). With no tile drainage management, upstream tile drainage to ditches comprised ∼90% of total ditch discharge. We also examined FIB loads from a subset of tile drained fields to determine field load contributions to the watershed drainage ditches. Statistical evidence of a CTD effect on FIB UAL in the surface water systems was not strong; however, there was statistical evidence of increased FIB densities [pronounced when E. coli >200 most probable number (MPN) 100 mL −1 ] in the test CTD watershed during the CTD-intervention period. This was likely a result of reduced dilution/flushing in the test CTD watershed ditch due to CTD significantly decreasing the amount of tile drainage water entering the surface water system. Tile E. coli load contributions to the ditches were low; for example, during the 6-yr CTD-intervention period they amounted to on average only ∼3 and ∼9% of the ditch loads for the test CTD and reference UCTD watersheds, respectively. This suggests in-stream, or off-field FIB reservoirs and bacteria mobilization drivers, dominated ditch E. coli loads in the watersheds during the growing season. Overall, this study suggested that decision making regarding deployment of CTD en masse in tile-fed watersheds should consider drainage practice effects on bacterial densities and loads, as well as CTD's documented capacity to boost crop yields and reduce seasonal nutrient pollution. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122036
Appears in Collections: 气候变化事实与影响
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作者单位: Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ONT K1A 0C6, Canada; London Research and Development Centre, Agriculture and Agri-Food Canada, London, ONT N5V 4T3, Canada; Aquanty Inc., Waterloo, ONT N2L 5C6, Canada
Recommended Citation:
Wilkes G.,Sunohara M.D.,Topp E.,et al. Do reductions in agricultural field drainage during the growing season impact bacterial densities and loads in small tile-fed watersheds?[J]. Water Research,2019-01-01