scholarly journals Low stream nitrate concentrations associated with oak forests on the Allegheny high plateau of Pennsylvania

2000 ◽  
Vol 36 (10) ◽  
pp. 3091-3094 ◽  
Author(s):  
Gregory P. Lewis ◽  
Gene E. Likens
Keyword(s):  
Oak Forests ◽  
High Plateau ◽  
Nitrate Concentrations ◽  
Stream Nitrate

REGIONAL COHERENCE OF STREAM NITRATE CONCENTRATIONS: IMPLICATIONS FOR THEORY AND MANAGEMENT

2018 ◽  
Author(s):  
Lauren E. Koenig ◽  
◽  
William H. McDowell ◽  
Lisle E. Snyder ◽  
Jody D. Potter
Keyword(s):  
Nitrate Concentrations ◽  
Stream Nitrate

scholarly journals Reduction of stream nitrate concentrations by land management in contrasted landscapes

2019 ◽  
Vol 114 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Laurène Casal ◽  
Patrick Durand ◽  
Nouraya Akkal-Corfini ◽  
Cyril Benhamou ◽  
François Laurent ◽  
...  
Keyword(s):  
Land Management ◽  
Nitrate Concentrations ◽  
Stream Nitrate

scholarly journals Export flux of unprocessed atmospheric nitrate from temperate forested catchments: A possible new index for nitrogen saturation

2018 ◽  
Author(s):  
Fumiko Nakagawa ◽  
Urumu Tsunogai ◽  
Yusuke Obata ◽  
Kenta Ando ◽  
Naoyuki Yamashita ◽  
...  
Keyword(s):  
Soil Water ◽  
Nitrogen Saturation ◽  
Weighted Average ◽  
Deposition Flux ◽  
Forested Catchments ◽  
Export Flux ◽  
Stable Isotopic ◽  
Nitrate Concentrations ◽  
Atmospheric Nitrate ◽  
Stream Nitrate

Abstract. To clarify the biological processing of nitrate within temperate forested catchments using unprocessed atmospheric nitrate exported from each catchment as a tracer, we continuously monitored stream nitrate concentrations and stable isotopic compositions including 17O-excess (Δ17O) in three forested catchments in Japan (KJ, IJ1, and IJ2) for more than two years. The catchments showed varying flux-weighted average nitrate concentrations: 58.4, 24.4, and 17.1 µmol L−1 in KJ, IJ1, and IJ2, respectively. In addition to stream nitrate, nitrate concentrations and stable isotopic compositions in soil water were determined for comparison in the most nitrate-enriched catchment (the KJ site). While 17O-excess of nitrate in soil water showed significant seasonal variation, ranging from +0.1 to +5.7 ‰, stream nitrate showed small variation, from +0.8 to +2.0‰ in KJ, +0.7 to +2.8 ‰ in IJ1, and +0.4 to +2.2‰ in IJ2. We concluded that the major source of stream nitrate in each forested catchment was nitrate in groundwater, which buffered the seasonal variations in soil water nitrate. The estimated annual export flux of unprocessed atmospheric nitrate accounted for 9.4 ± 2.6 %, 6.5 ± 1.8 %, and 2.6 ± 0.6 % of the annual deposition flux of atmospheric nitrate in KJ, IJ1, and IJ2, respectively. The export flux of unprocessed atmospheric nitrate relative to the deposition flux showed a clear normal correlation with the flux-weighted average concentration of stream nitrate, indicating that reductions in the biological assimilation rates of nitrate in forested soils, rather than increased nitrification rates, are likely responsible for the enrichment of stream nitrate, probably due to nitrogen saturation. The export flux of unprocessed atmospheric nitrate relative to the deposition flux in each forest ecosystem is applicable as an index for nitrogen saturation.

Climate Effects on Stream Nitrate Concentrations at 16 Forested Catchments in South Central Ontario

2004 ◽  
Vol 38 (8) ◽  
pp. 2383-2388 ◽  
Author(s):  
Shaun A. Watmough ◽  
M. Catherine Eimers ◽  
Julian Aherne ◽  
Peter J. Dillon
Keyword(s):  
Forested Catchments ◽  
Climate Effects ◽  
South Central ◽  
Nitrate Concentrations ◽  
Stream Nitrate

Groundwater dynamics and channel activity as major controls of in-stream nitrate concentrations in a lowland catchment system?

2007 ◽  
Vol 343 (3-4) ◽  
pp. 154-168 ◽  
Author(s):  
Gunter Wriedt ◽  
Joris Spindler ◽  
Tina Neef ◽  
Ralph Meißner ◽  
Michael Rode
Keyword(s):  
Channel Activity ◽  
Groundwater Dynamics ◽  
Nitrate Concentrations ◽  
Stream Nitrate

Long-Term Trends in Stream Nitrate Concentrations and Losses Across Watersheds Undergoing Recovery from Acidification in the Czech Republic

Ecosystems ◽  
2008 ◽  
Vol 11 (3) ◽  
pp. 410-425 ◽  
Author(s):  
Filip Oulehle ◽  
William H. McDowell ◽  
Jacqueline A. Aitkenhead-Peterson ◽  
Pavel Krám ◽  
Jakub Hruška ◽  
...  
Keyword(s):  
Czech Republic ◽  
The Czech Republic ◽  
Nitrate Concentrations ◽  
Recovery From Acidification ◽  
Long Term Trends ◽  
Stream Nitrate

A simple model of stream nitrate concentrations in forested and deforested catchments in Mid-Wales

1994 ◽  
Vol 158 (1-2) ◽  
pp. 61-78 ◽  
Author(s):  
William T. Sloan ◽  
Alan Jenkins ◽  
Andrew Eatherall
Keyword(s):  
Simple Model ◽  
Nitrate Concentrations ◽  
Stream Nitrate
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