eprintid: 13768 rev_number: 9 eprint_status: archive userid: 353 dir: disk0/00/01/37/68 datestamp: 2016-08-26 06:49:08 lastmod: 2021-08-27 17:41:35 status_changed: 2016-08-26 06:49:08 type: article metadata_visibility: show item_issues_count: 1 creators_name: Tian, S. creators_name: Youssef, M.A. creators_name: Richards, R.P. creators_name: Liu, J. creators_name: Baker, D.B. creators_name: Liu, Y. creators_id: 8187 title: Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA ispublished: pub divisions: prog_esm keywords: Land use; land cover; climate change; nitrate export; agricultural lands; urbanization abstract: Land use/land cover is a critical factor affecting temporal dynamics of nitrate export from watersheds. Based on a long-term(>30 years) water quality monitoring program in the Western Lake Erie area, United States, this study compared seasonal variation of nitrate export from an agricultural watershed and an urbanized watershed. A seasonality index was adapted to quantitatively characterize seasonal variation of nitrate export from the two watersheds. Results showed that monthly nitrate concentrations from the two watersheds exhibited different seasonal variation. Seasonality index of monthly nitrate loading for the agricultural watershed is approximately 3 times of that from the urbanized watershed and the difference is statistically significant (p<0.0001). Meanwhile, calculated historical seasonality indexes of monthly nitrate loading for both watersheds exhibited significant (p<0.05) decreasing trends according to the non-seasonal Mann-Kendall test. The identified differences in seasonal nitrate export from the two watersheds were mainly attributed to their distinct nitrogen sources, physical and biogeochemical settings. The declining seasonality index of monthly nitrate loading from the agricultural watershed could be partially caused by historical climate change in the study region, especially increased temperature during winter. Urbanization could be one key factor contributing to the declining seasonality index of monthly nitrate loading from the urbanized watershed. Information derived from this study have practical implications for developing proper management practices to mitigate nitrate pollution in Midwestern United States. date: 2016-08-26 date_type: published publisher: Elsevier id_number: 10.1016/j.jhydrol.2016.08.042 creators_browse_id: 184 full_text_status: none publication: Journal of Hydrology volume: 541 number: Part B pagerange: 1375-1384 refereed: TRUE issn: 1879-2707 coversheets_dirty: FALSE fp7_project: no fp7_type: info:eu-repo/semantics/article citation: Tian, S., Youssef, M.A., Richards, R.P., Liu, J. , Baker, D.B., & Liu, Y. (2016). Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA. Journal of Hydrology 541 (Part B) 1375-1384. 10.1016/j.jhydrol.2016.08.042 .