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DOI	10.1007/s10533-019-00631-z
	A ten year record of nitrate retention and solute trends in a Wisconsin sand plains stream: temporal variation at multiple scales
	Stelzer R.S.; Parr T.B.; Coulibaly M.
发表日期	2020
ISSN	1682563
卷号	147 期号:2
英文摘要	Nitrate retention is an important ecosystem service provided by streams which reduces nitrogen loads to downstream ecosystems. However, most inferences about nitrate retention and uptake in streams are based on measurements at sub-annual scales. Our objective was to evaluate variation in nitration retention and solute concentrations at weekly to decadal time scales. We measured nitrate and chloride concentration, nitrate flux and nitrate retention in Emmons Creek, a groundwater-dominated, nitrate-rich stream in central Wisconsin during a 10-year period. We used a two-station mass balance approach to measure nitrate retention while accounting for groundwater inputs. Surface water nitrate concentration, nitrate yield and nitrate retention exhibited strong seasonal variation. Seasonal Kendall tests revealed positive trends for surface water discharge, nitrate and chloride concentrations and groundwater chloride concentration, but not nitrate retention. Generalized additive mixed models (GAMM), accounting for serial autocorrelations, also indicated positive trends in surface water nitrate and chloride concentrations but no trend for nitrate retention. Nitrate retention averaged 370 mg NO3-N m−2 d−1 (± 316 SD) and was highest during the spring (512 mg NO3-N m−2 d−1 ± 319), followed by summer (460 ± 322), fall (340 ± 281) and winter (165 ± 212). Nitrate retention rates in Emmons Creek were relatively high compared to most published estimates. However, our results suggest that Emmons Cr. may have saturated its capacity to retain nitrate during a period when nitrate yield from its watershed increased, which is an important finding given the increases in N availability in many regions of earth. © 2019, Springer Nature Switzerland AG.
英文关键词	Groundwater; Long-term data; Mass balance; Nitrate retention; Time series modeling; Trend analysis
学科领域	autocorrelation; chemical mass balance; ecosystem service; groundwater resource; nitrate; reduction; solute; surface water; temporal variation; time series analysis; trend analysis; Emmons Creek; United States; Wisconsin; Wisconsin
语种	英语
scopus关键词	autocorrelation; chemical mass balance; ecosystem service; groundwater resource; nitrate; reduction; solute; surface water; temporal variation; time series analysis; trend analysis; Emmons Creek; United States; Wisconsin; Wisconsin
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120395
作者单位	Department of Biology, University of Wisconsin Oshkosh, 800 Algoma Blvd, Oshkosh, WI 54901, United States; Oklahoma Biological Survey, University of Oklahoma, 111 Chesapeake St, Norman, OK 73019, United States; Department of Geography, University of Wisconsin Oshkosh, 800 Algoma Blvd, Oshkosh, WI 54901, United States
推荐引用方式 GB/T 7714	Stelzer R.S.,Parr T.B.,Coulibaly M.. A ten year record of nitrate retention and solute trends in a Wisconsin sand plains stream: temporal variation at multiple scales[J],2020,147(2).
APA	Stelzer R.S.,Parr T.B.,&Coulibaly M..(2020).A ten year record of nitrate retention and solute trends in a Wisconsin sand plains stream: temporal variation at multiple scales.Biogeochemistry,147(2).
MLA	Stelzer R.S.,et al."A ten year record of nitrate retention and solute trends in a Wisconsin sand plains stream: temporal variation at multiple scales".Biogeochemistry 147.2(2020).