Nitrification and denitrification response to varying periods of desiccation and inundation in a western Kansas stream |
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Authors: | Brad J Austin Eric A Strauss |
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Institution: | (1) Department of Biological Sciences, Fort Hays State University, 600 Park St., Hays, KS 67601, USA;(2) Department of Biology, River Studies Center, University of Wisconsin-La Crosse, 1725 State St., La Crosse, WI 54601, USA;(3) Department of Biological Sciences, University of Arkansas-Fayetteville, 601 Science and Engineering, Fayetteville, AR 72701, USA |
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Abstract: | Changing environmental conditions and increased water consumption have transformed many historically perennial stream systems
into intermittent systems. Multiple drying and wetting events throughout the year might impact many stream processes including
nitrification and denitrification, key components of the nitrogen (N) cycle. During summer 2007, an experimental stream was
used to dry and then rewet stream sediments to determine the effects of desiccation and rewetting of stream sediment on nitrification
and denitrification potentials. Mean (±SE) nitrification and denitrification rates in sediment not dried (controls) were 0.431 ± 0.017 μg
NO3
−–N/cm2/h and 0.016 ± 0.002 μg N2O–N/cm2/h, respectively. As sediment samples dried, nitrification rates decreased. Rates in sediments dried less than 7 d recovered
to levels equal or greater than those in the controls within 1 d of being rewetted. Denitrification rates were not affected
by 1 d of drying, but samples dried greater than 1 d experienced reduced rates of denitrification. Denitrification in sediments
dried 7 d or less recovered by day seven of being rewetted. Nitrification and denitrification processes failed to fully recover
in sediments dried more than 7 d. These results demonstrate that alterations in stream’s hydrology can significantly affect
N-cycle processes. |
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Keywords: | |
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