Abstract
The mechanisms that cause the rapid and abundant release of nitrogen from hill slope farmlands into streams are still poorly understood. In hilly areas composed of purple soils high in nitrogen pollution content, TN, NO3-N, NH4-N, NO2-N, PN, and D/H, isotopic ratios loss processes were monitored in two sloping farmland plots over the course of two storms. The results show that the dominant transportation pathway of nitrogen loss involved NO3-N movement was through the subsurface flow both vertically and laterally. Subsurface flow can also contribute to significant degrees of PN loss. TN and PN peaks occurred before the subsurface flow peak was reached in every case. However, NO3-N peaks occurred both before and after flow peaks occurred. Hydrograph separation using δD shows that preferential flows dominated the generation of subsurface flows with low NO3-N concentrations. The δD profile response to rainwater shows that piston flows caused the accumulation of high soil water quantities in the outflow. Most of the samples demonstrated that dissolved inorganic nitrogen concentrations are positively correlated with outflow soil water proportions. Consequently, the piston flow type is assumed to have caused high degrees of dissolved nitrogen loss in the examined sloping farmlands. After being dispelled by the piston flow, preferential flows acted as the main transportation carrier of nitrogen in the runoff. These results suggest that the soil water proportions in flows significantly influence levels of dissolved nitrogen loss.
Similar content being viewed by others
Abbreviations
- DIN:
-
dissolved inorganic nitrogen
- N:
-
nitrogen
References
Allred BJ (2008) Cation effects on nitrate mobility in an unsaturated soil. T ASABE 51:1997–2012
Allred BJ, Brown GO, Bigham JM (2007) Nitrate mobility under unsaturated flow conditions in four initially dry soils. Soil Sci 172:27–41
American Public Health Association (1998) Standard methods for the examination of water and wastewater. American Public Health Association, Washington, DC 1268
Bernal S, Butturini A, Sabater F (2005) Seasonal variations of dissolved nitrogen and DOC:DON ratios in an intermittent Mediterranean stream. Biogeochemistry 75:351–372
Bernal S, Butturini A, Sabater F (2006) Inferring nitrate sources through end member mixing analysis in an intermittent Mediterranean stream. Biogeochemistry 81:269–289
Buda AR, DeWalle DR (2009) Dynamics of stream nitrate sources and flow pathways during stormflows on urban, forest and agricultural watersheds in central Pennsylvania, USA. Hydrol Process 23:3292–3305
Burns DA, Hooper RP, McDonnell JJ, Freer JE, Kendall C, Beven K (1998) Base cation concentrations in subsurface flow from a forested hillsope: the role of flushing frequency. Water Resour Res 34:3535–3544
Buttle JM, Lister SW, Hill AR (2001) Controls on runoff components on a forested slope and implications for N transport. Hydrol Process 15:1065–1070
Coplen TB, Herczeg AL, Barnes C (2000) Isotope engineering—using stable isotopes of the water molecule to solve practical problems. Environmental tracers in subsurface hydrology. Springer, pp 79–110
Creed IF, Band LE (1998) Export of nitrogen from catchments within a temperate forest: evidence for a unifying mechanism regulated by variable source area dynamics. Water Resour Res 34:3105–3120
Durand P, Torres J (1996) Solute transfer in agricultural catchments: the interest and limits of mixing models. J Hydrol 181:1–22
Ehleringer JR, Osmond CB (1989) Stable isotopes. In: Pearcy RW, Ehleringer J, Mooney HA, Rundel PW (eds) Plant physiological ecology, field methods and instrumentation. Chapman and Hall, New York, pp 281–300
Elliott J, Cesna A, Best K, Nicholaichuk W, Tollefson L (2000) Leaching rates and preferential flow of selectedherb icides through tilled and untilled soil. J Environ Qual 29:1650–1656
Elrashidi MA, Mays MD, Fares A, Seybold CA, Harder JL, Peaslee SD, VanNeste P (2005) Loss of nitrate-nitrogen by runoff and leaching for agricultural watersheds. Soil Sci 170:969–984
Fomsgaard I, Spliid N, Fielding G (2003) Leaching of pesticides through normal-tillage and low-tillage soil—a lysimeter study. II. Glyphosate. J Environ Sci Health B 38:19–35
Gao M, Zhu B, Chen K, Li Q (2004) Study on environment features of N and P of water in watershed in Hilly area of purple soil. Adv Earth Sci 19:487–490 (in Chinese with English abstract)
Gong ZT (1999) Chinese soil taxonomy. Science Press, Beijing (in Chinese with Englsih abstract)
Greenan CM, Moorman TB, Parkin TB, Kaspar TC, Jaynes DB (2009) Denitrification in wood chip bioreactors at different water flows. J Environ Qual 38:1664–1671
Hao C, Yan D, Xiao W, Shi M, He D, Sun Z (2014) Impacts of typical rainfall processes on nitrogen in typical rainfield of black soil region in Northeast China. Arab J Geosci 1–13
Hangen E, Lindenlaub M, Leibundgut C, Von Wilpert K (2001) Investigating mechanisms of stormflow generation by natural tracers and hydrometric data: a small catchment study in the Black Forest, Germany. Hydrol Process 15:183–199
He Y (1991) Purple soils in China (2). Science Press, Beijing (in Chinese)
Hill A (1996) Nitrate removal in stream riparian zones. J Environ Qual 25:743–755
Hill AR, Kemp WA, Buttle JM, Goodyear D (1999) Nitrogen chemistry of subsurface storm runoff on forested Canadian shield hillslopes. Water Resour Res 35:811–821
Hornberger GM, Bencala KE, McKnight DM (1994) Hydrological controls on dissolved organic carbon during snowmelt in the Snake River near Montezuma, Colorado. Biogeochemistry 25:147–165
Huang W, Heifner R, Taylor H, Uri N (2000) Timing nitrogen fertilizer application to reduce nitrogen losses to the environment. Water Resour Manag 14:35–58
Jarvis N (2007) A review of non-equilibrium water flow and solute transport in soil macropores: principles, controlling factors and consequences for water quality. Eur J Soil Sci 58:523–546
Jia HY, Lei A, Lei J, Ye M, Zhao JZ (2007) Effects of hydrological processes on nitrogen loss in purple soil. Agric Water Manag 89:89–97
Konohira E, Muneoki Y, Kubota J, Yagi K, Akiyama H (2001) Effects of riparian denitrification on stream nitrate-evidence from isotope analysis and extreme nitrate leaching during rainfall. Water Air Soil Pollut 130:667–672
Kroeze C, Aerts R, van Breemen N et al (2003) Uncertainties in the fate of nitrogen I: an overview of sources of uncertainty illustrated with a Dutch case study. Nutr Cycl Agroecosyst 66:43–69
McDonnell JJ, Borga M, Stewart KM, Pearce JA (1990) Deuterium variations in storm rainfall: implications for stream hydrograph separation. Water Resour Res 26:455–458
McHale MR, McDonnell JJ, Mitchell MJ, Cirmo CP (2002) A field-based study of soil water and groundwater nitrate release in an Adirondack forested watershed. Water Resour Res 38:1031. doi:10.1029/2000WR000102
Neal C, Hill T, Hill S, Reynolds B (1997) Acid neutral ization capacity measurements in surface and groundwaters in the Upper River Severn, Plynlimon: from hydrograph splitting to water flow pathways. Hydrol Earth Syst Sci 1:687–696
Peterson EW, Davis RK, Brahana JV, Orndorff HA (2002) Movement of nitrate through regolith covered karst terrane, northwest Arkansas. J Hydrol 256:35–47
Pionke HB, Gburek WJ, Sharpley AN (2000) Critical source area controls on water quality in an agricultural watershed located in the Chesapeake Basin. Ecol Eng 14:325–335
Smith VH, Tilman GD, Nekola JC (1999) Eutrophication: impacts of excess nutrient inputs on freshwater, marine, and terrestrial ecosystems. Environ Pollut 100:179–196
Soulsby C, Petry J, Brewer M, Dunn S, Ott B, Malcolm I (2003) Identifying and assessing uncertainty in hydrological pathways: a novel approach to end membr mixing in a Scottish agricultural catchment. J Hydrol 274:109–128
Stumpp C, Maloszewski P (2010) Quantification of preferential flow and flow heterogeneities in an unsaturated soil planted with different crops using the environmental isotope d18O. J Hydrol 394:407–415
Tomer MD, Wilson CG, Moorman TB, Cole KJ, Heer D, Isenhart TM (2010) Source-pathway separation of multiple contaminants during a rainfall-runoff event in an artificially drained agricultural watershed. J Environ Qual 39:882–895
van Verseveld WJ, McDonnell JJ, Lajtha K (2008) A mechanistic assessment of nutrient flushing at the catchment scale. J Hydrol 358:268–287
van Verseveld WJ, McDonnell JJ, Lajtha K (2009) The role of hillslope hydrology in controlling nutrient loss. J Hydrol 367:177–187
Wang T, Zhu B, Gao M, Xu T, Kuang F (2006) Nitrate pollution of groundwater in a typical small watershed in the central Sichuan hully region. J Ecology Rural Environ 22:84–87 (in Chinese with English abstract)
Wilcock RJ, Nagels JW, Rodda HJE, O'Connor M, Thorrold B, Barnett J (1999) Water quality of a lowland stream in a New Zealand dairy farming catchment. New Zeal J Mar Fresh 33:683–696
Xiao M, Yu S, She D, Hu X, Chu L (2014) Nitrogen and phosphorus loss and optimal drainage time of paddy field under controlled drainage condition. Arab J Geosci doi:. doi:10.1007/s12517-014-1540-6
Zhao P, Tang X, Zhao P, Wang C, Tang J (2013) Identifying the water source for subsurface flow with deuterium and oxygen-18 isotopes of soil water collected from tension lysimeters and cores. J Hydrol 503:1–10
Zhu B, Wang T, Kuang FH, Luo ZX, Tang JL, Xu TP (2009) Measurements of nitrate leaching from a hillslope cropland in the Central Sichuan Basin, China. Soil Sci Soc Am J 73:1419–1426
Acknowledgments
This study was supported by the National Basic Research Program of the Ministry of Science and Technology of China (No. 2012CB417101, National Natural Science Foundation of China (41471188, 41371241), the Hundred Talents Program of the Chinese Academy of Sciences and Sichuan Province. We thank the anonymous reviewers and the editors for their significant assistance with this manuscript.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhao, P., Tang, X., Tang, J. et al. The nitrogen loss flushing mechanism in sloping farmlands of shallow Entisol in southwestern China: a study of the water source effect. Arab J Geosci 8, 10325–10337 (2015). https://doi.org/10.1007/s12517-015-1983-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12517-015-1983-4