Effect of variable annual precipitation and nutrient input on nitrogen and phosphorus transport from two Midwestern agricultural watersheds
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- 作者：S.J. Kalkhoffa ; sjkalkho@usgs.gov" class="auth_mail" title="E-mail the corresponding author ; L.E. Hubbardc ; M.D. Tomerb ; D.E. Jamesb
- 关键词：CC ; continuous corn ; CS ; corn-soybean rotation ; CV ; coefficient of variation (standard deviation divided by mean) ; LCR ; Little Cobb River ; Mg ; megagrams ; NO3-N ; dissolved nitrate-plus nitrite nitrogen ; RL ; reporting limit ; SFIR ; South Fork of the Iowa River ; SRP ; soluble reactive phosphorus ; TN ; total nitrogen ; TP ; total phosphorus ; WRTDS ; weighted regressions on time ; discharge ; and season
- 刊名：Science of the Total Environment
- 出版年：2016
- 出版时间：15 July 2016
- 年：2016
- 卷：559
- 期：Complete
- 页码：53-62
- 全文大小：1252 K
文摘
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Data were collected over a complete wet/dry climatic cycle of about 11 years
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Differentiated precipitation from land use impacts on nutrient transport in streams
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About 65% of NO3-N and 50% of TP loads were transported during April through June
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Differences in precipitation impacted timing of transport
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NO3-N yield in relation to runoff was greater in watershed with greater nutrient input