Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA

Tian, S.1; Youssef, M. A.1; Richards, R. P.2; Liu, J.3,4; Baker, D. B.2; Liu, Y.1

2016-10

10.1016/j.jhydrol.2016.08.042

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

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. (C) 2016 Elsevier B.V. All rights reserved.

Land use Land cover Climate change Nitrate export Agricultural lands Urbanization

SCI ; EI

英语

其他

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000386410400055

ELSEVIER SCIENCE BV

20164402969752

Agriculture ; Climate change ; Lakes ; Land use ; Nitrates ; Water quality ; Watersheds

Urban and Regional Planning and Development:403 ; Atmospheric Properties:443.1 ; Surface Water:444.1 ; Water Analysis:445.2 ; Water Pollution:453 ; Inorganic Compounds:804.2 ; Agricultural Equipment and Methods; Vegetation and Pest Control:821

ENGINEERING

Web of Science

1.North Carolina State Univ, Dept Biol & Agr Engn, Raleigh, NC 27695 USA
2.Heidelberg Univ Tiffin, Natl Ctr Water Qual Res, Tiffin, OH 44883 USA
3.South Univ Sci & Technol China, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
4.Int Inst Appl Syst Anal, Ecosyst Serv & Management Program, Schlosspl 1, A-2361 Laxenburg, Austria

Tian, S.,Youssef, M. A.,Richards, R. P.,et al. Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA[J]. JOURNAL OF HYDROLOGY,2016,541:1375-1384.

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,541,1375-1384.

Tian, S.,et al."Different seasonality of nitrate export from an agricultural watershed and an urbanized watershed in Midwestern USA".JOURNAL OF HYDROLOGY 541(2016):1375-1384.