TY  - JOUR
T1  - Changing nitrogen deposition with low δ15N−NH4 + and δ15N−NO3 − values at the Experimental Lakes Area, northwestern Ontario, Canada
AU  - Venkiteswaran, J.J.
AU  - Schiff, S.L.
AU  - Paterson, M.J.
AU  - Flinn, N.A.P.
AU  - Shao, H.
AU  - Elgood, R.J.
Y1  - 2017/01/01
PY  - 2017
DA  - 2017/01/01
N1  - doi: 10.1139/facets-2016-0060
DO  - 10.1139/facets-2016-0060
T2  - FACETS
JF  - FACETS
SP  - 249
EP  - 266
VL  - 2
PB  - Canadian Science Publishing
N2  - Ammonium deposition at the International Institute for Sustainable Development Experimental Lakes Area (IISD?ELA), in northwestern Ontario, Canada, has doubled in the last 45 years and thus is no longer among the low nitrogen (N) deposition sites in North America. This may be related to the concurrent intensification of Manitoba agriculture to the west and upwind of the ELA. Large increases in ammonium deposition at the ELA were important in driving the observed trend and increased the NH4 + to NO3 ? ratio of input to aquatic and terrestrial systems. Stable isotope analyses of two years of bulk (wet and dry) atmospheric deposition revealed very large ranges in δ15N?NH4 + (22? range), δ15N?NO3 ? (18?), and δ18O?NO3 ? (19?). Few other δ15N?NH4 +, δ15N?NO3 ?, and δ18O?NO3 ? values have been published for Canadian precipitation. Increases in δ15N of NH4 + and NO3 ? in July occurred with increases in total N deposition. The wide range and seasonal trends of δ15N and δ18O values in ELA precipitation mean that studies characterizing N inputs to watersheds and lakes require an ongoing and comprehensive annual sampling regime. Global trends of declining δ15N of N deposition evident in lake sediment records may be a result of increases in NH4 + deposition with lower δ15N?NH4 + values. Similarly, the relationship in Lake Superior between increasing NO3 ? and lower δ15N?NO3 ? values may be explained by increased atmospheric deposition of N with low δ15N values.
AB  - Ammonium deposition at the International Institute for Sustainable Development Experimental Lakes Area (IISD?ELA), in northwestern Ontario, Canada, has doubled in the last 45 years and thus is no longer among the low nitrogen (N) deposition sites in North America. This may be related to the concurrent intensification of Manitoba agriculture to the west and upwind of the ELA. Large increases in ammonium deposition at the ELA were important in driving the observed trend and increased the NH4 + to NO3 ? ratio of input to aquatic and terrestrial systems. Stable isotope analyses of two years of bulk (wet and dry) atmospheric deposition revealed very large ranges in δ15N?NH4 + (22? range), δ15N?NO3 ? (18?), and δ18O?NO3 ? (19?). Few other δ15N?NH4 +, δ15N?NO3 ?, and δ18O?NO3 ? values have been published for Canadian precipitation. Increases in δ15N of NH4 + and NO3 ? in July occurred with increases in total N deposition. The wide range and seasonal trends of δ15N and δ18O values in ELA precipitation mean that studies characterizing N inputs to watersheds and lakes require an ongoing and comprehensive annual sampling regime. Global trends of declining δ15N of N deposition evident in lake sediment records may be a result of increases in NH4 + deposition with lower δ15N?NH4 + values. Similarly, the relationship in Lake Superior between increasing NO3 ? and lower δ15N?NO3 ? values may be explained by increased atmospheric deposition of N with low δ15N values.
M3  - doi: 10.1139/facets-2016-0060
UR  - https://doi.org/10.1139/facets-2016-0060
Y2  - 2024/04/24
ER  - 


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AU  - Alewell, C
AU  - Arp, P
AU  - Bailey, S
AU  - Clair, T
JO  - Environmental Monitoring and Assessment
Y1  - 2005
VL  - 109
SP  - 1
ER  - 

TY  - JOUR
T1  - 18O isotopic separation of stream nitrate sources in mid-Appalachian forested watersheds
AU  - Williard, KWJ
AU  - DeWalle, DR
AU  - Edwards, PJ
AU  - Sharpe, WE
JO  - Journal of Hydrology
Y1  - 2001
VL  - 252
SP  - 174
ER  - 

TY  - JOUR
T1  - Recent ecological and biogeochemical changes in alpine lakes of Rocky Mountain National Park (Colorado, USA): a response to anthropogenic nitrogen deposition
AU  - Wolfe, AP
AU  - Van Gorp, AC
AU  - Baron, JS
JO  - Geobiology
Y1  - 2003
VL  - 1
SP  - 153
ER  - 

TY  - JOUR
T1  - Isotopic composition of water-soluble nitrate in bulk atmospheric deposition at Dongsha Island: sources and implications of external N supply to the northern South China Sea
AU  - Yang, J-YT
AU  - Hsu, S-C
AU  - Dai, MH
AU  - Hsiao, SS-Y
AU  - Kao, S-J
JO  - Biogeosciences
Y1  - 2014
VL  - 11
SP  - 1833
ER  - 

TY  - JOUR
T1  - Multiyear dual nitrate isotope signatures suggest that N-saturated subtropical forested catchments can act as robust N sinks
AU  - Yu, L
AU  - Zhu, J
AU  - Mulder, J
AU  - Dörsch, P
JO  - Global Change Biology
Y1  - 2016
VL  - 22
SP  - 3662
ER  - 

TY  - JOUR
T1  - Sensitive measurement of NH4+ 15N/14N (δ15NH4+) at natural abundance levels in fresh and saltwaters
AU  - Zhang, L
AU  - Altabet, MA
AU  - Wu, T
AU  - Hadas, O
JO  - Analytical Chemistry
Y1  - 2007
VL  - 79
SP  - 5297
ER  - 

TY  - JOUR
T1  - Nitrogen inputs and isotopes in precipitation in the North China Plain
AU  - Zhang, Y
AU  - Liu, XJ
AU  - Fangmeier, A
AU  - Goulding, KTW
AU  - Zhang, FS
JO  - Atmospheric Environment
Y1  - 2008
VL  - 42
SP  - 1436
ER  -