Articles | Volume 15, issue 13
Biogeosciences, 15, 3953–3965, 2018
Biogeosciences, 15, 3953–3965, 2018

Research article 02 Jul 2018

Research article | 02 Jul 2018

Stable isotopes of nitrate reveal different nitrogen processing mechanisms in streams across a land use gradient during wet and dry periods

Wei Wen Wong et al.

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Cited articles

Barnes, R. T. and Raymond, P. A.: Land-use controls on sources and processing of nitrate in small watersheds: insights from dual isotopic analysis, Ecol. Appl., 20, 1961–1978,, 2010. 
Bateman, A. S. and Kelly S. D.: Fertilizer nitrogen isotope signatures, Isot. Environ. Healt. S., 43, 237–247,, 2007. 
Battaglin, W. A., Kendall, C., Chang, C. C. Y., Silva, S. R., and Campbell, D. H.: Chemical and isotopic evidence of nitrogen transformation in the Mississippi River, 1997–1998, Hydrol. Process., 15, 1285–1300,, 2001. 
Billy, C., Billen, G., Sebilo, M., Birgand, F., and Tournebize, J.: Nitrogen isotopic composition of leached nitrate and soil organic matter as an indicator of denitrification in a sloping drained agricultural plot and adjacent uncultivated riparian buffer strips, Soil Biol. Biochem., 42, 108–117,, 2010. 
Buchwald, C. and Casciotti, K. L.: Oxygen isotopic fractionation and exchange during bacterial nitrite oxidation, Limnol. Oceanogr., 55, 1064–1074,, 2010. 
Short summary
Over-enrichment of nitrate can pose substantial risk to the quality of freshwater ecosystems. Hence, understanding the dynamics of nitrate is the key to better management of waterways. This study evaluates the relationship between the effects of land use and rainfall on the major sources and processing of nitrate within and between five streams in five catchments spanning an agricultural land use gradient. We found that rainfall exerted significant control over the fate of nitrate.
Final-revised paper