2017
DOI: 10.1016/j.scitotenv.2017.04.174
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Patterns of nitrogen export from a seasonal freezing agricultural watershed during the thawing period

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Cited by 18 publications
(11 citation statements)
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“…Spring 2014 was lacking a large snowmelt event and the smaller freshet storms (71-77) mainly diluted NO 3 -N concentration. The NO 3 -N concentration experienced only a moderate increase after the ice clearance in March 2014 and did not rise as high as during the spring thaw in 2010-2013, which might have been influenced by the deeper than the average soil frost depth during February 2014 (Table S1) (Zhao et al, 2017). The results are inconsistent compared to those reported by Fitzhugh et al (2001) who found that soil freezing accelerated NO 3 -N leaching from forests.…”
Section: Implications Of Warmer Winters On Concentrations and Loadsmentioning
confidence: 77%
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“…Spring 2014 was lacking a large snowmelt event and the smaller freshet storms (71-77) mainly diluted NO 3 -N concentration. The NO 3 -N concentration experienced only a moderate increase after the ice clearance in March 2014 and did not rise as high as during the spring thaw in 2010-2013, which might have been influenced by the deeper than the average soil frost depth during February 2014 (Table S1) (Zhao et al, 2017). The results are inconsistent compared to those reported by Fitzhugh et al (2001) who found that soil freezing accelerated NO 3 -N leaching from forests.…”
Section: Implications Of Warmer Winters On Concentrations and Loadsmentioning
confidence: 77%
“…10). The C-Q response suggests flushing of a finite source of NO 3 -N from soil and snowpack into the river (Ohte et al, 2004;Pellerin et al, 2012;Zhao et al, 2017) and that unfrozen soil NO 3 -N pools have gradually increased under the snowpack. The result does not support the suggestion by Brooks et al (1998) that microbial biomass developed in snowcovered soil acted as a significant buffer limiting NO3-N flushing from soils into surface waters during early snowmelt.…”
Section: Response Of Turbidity No 3 -N and Cod To Snowmeltmentioning
confidence: 99%
“…Nitrogen is the key element for maize yield (Evenson and Gollin, 2003;Rubin et al, 2016;Abera et al, 2017;Ning et al, 2018). To achieve high yield in China and other countries, farmers frequently apply N fertilizers in excess of crop requirements (Richter and Roelcke, 2000;Peng et al, 2010;Chen et al, 2011;Zhang et al, 2013;Zhang et al, 2015), which reduces N use efficiency (NUE; Noor, 2017;Chen et al, 2018;Yong et al, 2018) and contributes to N losses and environmental pollution Zhao et al, 2017;Zhang et al, 2017;Chen et al, 2017). Previous studies have shown that increased plant density is among the major factors associated with increases in maize yield (Tollenaar and Lee, 2002;Tokatlidis and Koutroubas, 2004;Long et al, 2006;Meng et al, 2013) and NUE (Cheng et al, 2015;Ren et al, 2017;Wei et al, 2017).…”
Section: Researchmentioning
confidence: 99%
“…Additional evidence is shown with the positive relationship between Ca 2+ + Mg 2+ and HCO 3 − with pCO 2 (Figure 8c,d), denoting that a higher pCO 2 level in water promotes higher carbonate dissolution rates. Figure 8f also shows a net pCO 2 decrease from end-of-summer to winter, probably due to the increase in water flow level and to the decrease of temperature [136,137]. But outside the dilution effect during the high flow period, the lower content of bicarbonate could be attributed to the consumption of DIC by secondary formation of CaCO 3 and also to losses by CO 2 degassing into the atmosphere (inverse reaction of Equation (4)).…”
Section: Role Of Discharge Temperature and Vegetation On Stream Watementioning
confidence: 94%