uid=BNZ,o=lter,dc=ecoinformatics,dc=org all public read knb-lter-bnz.146.10 Jonathan A. O'Donnell Reseach Hydrologist

3215 Marine St. Suite E-127 Boulder CO 80303 United States

303-541-3097 303-541-3084 jodonnell@usgs.gov Bonanza Creek LTER Data Manager

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 jpdowning@alaska.edu http://www.lter.uaf.edu Jeremy Jones Assistant Professor of Biology

Institute of Arctic Biology; Department of Biology and Wildlife; University of Alaska Fairbanks Fairbanks AK 99775 Unites States

(907) 474-7972 (907) 474-6967 Associated investigator 2006-01-01 Prior to this investigation, denitrification had not been intensively measured in headwater catchments of interior Alaska. The primary purpose of this database was to estimate the importance of denitrification as a mechanism of nitrogen retention in the riparian zone of watersheds underlain by discontinuous permafrost. caribou poker creeks research watershed (CPCRW) watersheds denitrification Biogeochemistry

While metadata will be freely available to those requesting it, the data manager will assure that any restrictions on access to data sets in the database will be enforced. Data will not be released without proper permission first being obtained from the investigator who generated the data.

Researchers should receive adequate acknowledgment for the use of their data by others and should be provided with copies of publications using their data. Users of data from the data base must be aware that data is not to be sold or redistributed.

It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set.

http://www.lter.uaf.edu/data_detail.cfm?datafile_pkey=146 Site information unavailable -147.603928 -147.5713145 65.15876438 65.14329713 2004-05-01 2004-10-28

Completed

Bonanza Creek LTER Data Manager

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 jpdowning@alaska.edu http://www.lter.uaf.edu Bonanza Creek LTER

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 Bonanza Creek LTER

Denitrification rate was measured on riparian soils on five dates from May 25 and September 1, 2004 using the acetylene block technique on intact soil cores constructed of ABS pipe (3.8 cm ID x 25 cm length). Soil cores were collected from randomly-selected points to a depth of 15 cm in the valley bottom of each watershed (25 to 30 cores per watershed per date).

Field Methods: After collecting soil, cores were capped with rubber stoppers. One stopper was modified with a sampling port for sampling gas in the headspace. After capping with rubber stoppers, cores were amended with 50 ml of stream water and 20 ml of acetylene (10% by total volume), and then shaken vigorously to aid equilibration between aqueous and gaseous phases. Cores were stored in a cooler to maintain the temperature near in situ conditions during the incubation (2 - 6 ºC). Gas samples for nitrous oxide measurement were collected at 2 (initial) and 6 hours (final) following the acetylene addition with a 60 ml syringe and transferred to an evacuated serum vial until analysis. Lab methods: Nitrous oxide concentration was measured using a Varian CP-3800 gas chromatograph equipped with an electron capture detector. Following incubations, soil was dried at 95 ºC in order to calculate denitrification on a soil dry mass basis. Processing procedures: Denitrification rate was calculated as the difference between final and initial nitrous oxide concentration (corrected for gas volume in headspace, soil water volume, and nitrous oxide dissolved in aqueous phase, Bunsen coefficient = 0.02 moles N2O L-1 H2O).

geoReference 2004-05-01 2004-10-28

every 3-4 weeks

riparian_denitrification_CPCRW_2004.txt riparian_denitrification_CPCRW_2004.txt 1 \n \n column \t http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-bnz..&urlTail=/ascii/files/riparian_denitrification_CPCRW_2004.txt Date Date Sample date for each measurement string dd/mm/yy -999 Missing Value Watershed Watershed Watershed site name string Watershed site name -999 Missing Value Sample No Sample No Sample replicate number integer Sample replicate number -999 Missing Value DN Rate Mass DN Rate Mass dentirification reported on a soil mass basis float ngN20gsoil-1h-1 real -999 Missing Value DN Rate Area DN Rate Area dentirification reported on a area basis float ngN20m-2h-1 real -999 Missing Value