Nitrate concentration and 15N signal of Streamwater and Precipitation from Archived Samples: Watershed 3
TITLE
Nitrate concentration and 15N signal of Streamwater and Precipitation from Archived Samples: Watershed 3
PRINCIPAL INVESTIGATOR(s)
Susana Bernal
Center for Advanced Studies of Blanes, Consejo Superior de Investigaciones Cientificas (CEAB-CSIC)
17300 Blanes
Girona
SPAIN
Lars Hedin
Princeton University
Department of Ecology and Evolutionary Biology
Princeton, NJ 08542
USA
Gene E. Likens
Institute of Ecosystem Studies
2801 Sharon Turnpike
Millbrook, NY 12545
USA
Stefan Gerber
University of Florida
Soil and Water Science Department
Gainesville, FL 32611
USA
Don Buso
Institute of Ecosystem Studies
234 Mirror Lake Road
North Woodstock, NH 03262
USA
ABSTRACT:
This data set includes the analysis of 18 Oxygen isotopes in precipitation and streamwater archived samples from watershed 3.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
HBEF Watershed 3, HBR, Hubbard Brook LTER, isotope, nitrate, stream, watershed.
KEYWORD SET: LTER Core Research Areas
inorganic nutrients.
BEGIN DATE
1990
END DATE
2007
LOCATION
HBEF watershed 3 (WS3)
West bounding coordinate: -71.725029
East bounding coordinate: -71.716533
North bounding coordinate: 43.962196
South bounding coordinate: 43.954650
ARCHIVED SAMPLES
Stream water and bulk deposition samples from the different weirs and meteorological stations at HBEF have been stored at the US Department of Agriculture, Forest Service headquarters from as early as 1963. These archived samples have been kept at room temperature after adding reagent-grade chloroform for preservation (3) (1 mL L−1). We had access to archived samples from 1982 to 2007 collected at the weir of W3 (the hydrological reference watershed at HBEF) and bulk de-position samples from the rain gauge station 1 (43d57mN, 71d44mW).
ANALYTICAL PROTOCOL
All water samples were analyzed for nitrate with a Dionex ionic chromatograph, and the δ15N-NO3− isotopic signatures were analyzed using the denitrifier method. To minimize the influence of any storage effects on the isotopic signature of nitrate, we considered only archived samples for which there was no evidence that nitrate levels had changed significantly since they were first measured. Our criterion was fulfilled only in 19 of 100 samples and comprised 11 stream water samples and 8 bulk deposition samples from winter and early spring (January to April) for the period of 1990–2007
REFERENCES
  • Bernal, S., Hedin, L.O., Likens, G.E., Gerber, S., and Buso, D.C.. 2012. Complex response of the forest nitrogen cycle to climate change. Proceedings of the National Academy of Sciences of the United States of America 109(9):3406-3411.
DATA ACCESS GUIDELINES
Data Use Policy



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Citation example: Holmes, R.T. 2012. Bird Abundances at Hubbard Brook (1969-2010) and on three replicate plots (1986-2000) in the White Mountain National Forest. Durham, NH. Hubbard Brook Data Archive [Database]. http://hubbardbrook.org/data/dataset.php?id=81 (23 July 2012)

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Acknowledgment example: Data on [topic] were provided by [name of PI] on [date]. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station, Newtown Square, PA. Significant funding for collection of these data was provided by [agency]-[grant number], [agency]-[grant number], etc.

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CONTACT PERSON

Information Manager, Hubbard Brook LTER
234 Mirror Lake Road
North Woodstock, NH 03262
USA

Phone: (603) 726-8902
Email: hbr-im@lternet.edu

Data file: W3stm_precip_no3.txt
Description: Archived stream and bulk precipitation data for Watershed 3 at Hubbard Brook LTER
Notes on Data: These samples are stored in the Sample Archive Building at the Robert S. Pierce Ecosystem Laboratory, Hubbard Brook Experimental Forest, North Woodstock, NH.
ColumnVariableDescriptionUnitsCoded?Missing value label
1SiteSample locationnoneynone
2SampleDateDate of sample collectionYYYY-MM-DDnnone
3TypeType of sample analysednoneynone
4NO3ppbnitrate concentration in ppb N-NO3 partPerBillionnnone
5delta_15N-NO3delta 15 N in nitrate measured in parts per thousand (o/oo)perMilnnone

CODES

Variable: Site
Code
Description
W3
Watershed 3
RG1
Rain Gage 1
Variable: Type
Code
Description
Stream
Streamwater sample
Precip
Bulk precipitation sample