2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 12:00 PM - 12:15 PM | DECADAL TRENDS AND DRIVERS OF NITROGEN CONCENTRATIONS IN GRASSLAND STREAMS | 330 B
DECADAL TRENDS AND DRIVERS OF NITROGEN CONCENTRATIONS IN GRASSLAND STREAMS
Grasslands are highly threatened biomes and there is little information on how pristine grassland streams have been modified over time. Furthermore, headwater streams are critical predictors of downstream nutrient concentrations, and their nutrient export is influenced by factors including climate and land-use. We used water quality data from 1983-2016 from Konza Prairie Biological Station to examine how N export from a grassland watershed has changed on a decadal scale. Long term data from Konza Prairie allow examination of how N export is influenced by factors such as land-use, precipitation, and hydrology. Trend analysis showed an increasing trend for reduced N (as NH4+) at large spatial scale and decreasing trend for oxidized N (as NO3-) on a more local scale. Regression analysis indicated that atmospheric deposition of N is important for reduced and oxidized N, but hydrology and prairie restoration are more significant for oxidized N. Our results highlight varying scales of influence that impact water quality in low-order grassland streams. Local land-use variables appear to be crucial for oxidized N, while large-scale disturbances are more important for reduced N.
- Ecosystem
- Monitoring
- Intermittent
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Presenters/Authors
James Guinnip
(), Kansas State University, jguinnip@ksu.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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