Abstract
Irrigated agriculture can modify the cycling and transport of nitrogen (N), due to associated water diversions, water losses, and changes in transport flow-paths. We investigate dominant processes behind observed long-term changes in dissolved inorganic nitrogen (DIN) concentrations and loads of the extensive (465,000 km2) semi-arid Amu Darya River basin (ADRB) in Central Asia. We specifically considered a 40-year period (1960-2000) of large irrigation expansion, reduced river water flows, increased fertilizer application and net increase of N input into the soil-water system. Results showed that observed decreases in riverine DIN concentration near the Aral Sea outlet of ADRB primarily were due to increased recirculation of irrigation water, which extends the flow-path lengths and enhances N attenuation. The observed DIN concentrations matched a developed analytical relation between concentration attenuation and recirculation ratio, showing that a fourfold increase in basin-scale recirculation can increase DIN attenuation from 85 to 99%. Such effects have previously only been observed at small scales, in laboratory experiments and at individual agricultural plots. These results imply that increased recirculation can have contr...Continue Reading
References
Dec 10, 2002·Reproductive Biomedicine Online·Y VerlinskyA Kuliev
Dec 19, 2002·Environmental Science & Technology·Liping WengWillem H Van Riemsdijk
May 6, 2003·Environmental Science and Pollution Research International·Val H Smith
May 28, 2005·The Science of the Total Environment·Howard D PassellEdward J Bedrick
Jul 26, 2005·Science·Jonathan A FoleyPeter K Snyder
Jan 19, 2006·Environmental Science and Pollution Research International·Giuseppe CrosaAlessandro Fumagalli
Apr 6, 2006·Water Science and Technology : a Journal of the International Association on Water Pollution Research·T HitomiE Shiratani
May 23, 2006·Water Research·G CrosaD Calamari
Aug 19, 2006·Environmental Monitoring and Assessment·J CausapéR Aragüés
Jan 9, 2007·Ecological Applications : a Publication of the Ecological Society of America·S SeitzingerG Van Drecht
Feb 28, 2007·Physical Chemistry Chemical Physics : PCCP·Yann GarciaJuliusz A Wolny
Mar 1, 2008·Trends in Ecology & Evolution·Line J GordonElena M Bennett
Feb 10, 2009·Journal of Environmental Quality·Chris van KesselJan Willem van Groenigen
Sep 10, 2009·The Science of the Total Environment·Luis LassalettaJosé V Rovira
Sep 23, 2010·Environmental Monitoring and Assessment·Gajanan K KhadsePawan K Labhsetwar
Dec 7, 2010·Environment International·Rebecka TörnqvistBakhtiyor Karimov
Aug 16, 2011·Journal of Environmental Monitoring : JEM·Pingping LuoYosuke Yamashiki
Sep 14, 2011·The Science of the Total Environment·Fayçal Bouraoui, Bruna Grizzetti
Mar 30, 2012·Journal of the American Water Resources Association·Juliane B BrownJean A Dupree
Jun 12, 2012·Water Research·Sebastian SchimmelpfennigUwe Dünnbier
Sep 15, 2012·Journal of Environmental Monitoring : JEM·Josefin ThorslundEkaterina V Belozerova
Citations
Jul 21, 2016·Environmental Science & Technology·Jacob G MortensenDavid James Van Horn
Aug 7, 2018·The Science of the Total Environment·Elisa SoanaGiuseppe Castaldelli
Jun 2, 2021·Environmental Pollution·Peifang LengSayidjakhon Khasanov
Jun 15, 2021·Journal of Environmental Management·Elisa SoanaGiuseppe Castaldelli