uid=BNZ,o=lter,dc=ecoinformatics,dc=org all public read knb-lter-bnz.190.10 Isla Myers-Smith

405 CW Biological Sciences Building, Dept. Biological Sciences University of Alberta, , AB, T6G 2E9 Edmonton Aberta T6G 2E9 Canada

(780) 492-1295 myerssmi@ualberta.ca http://www.ualberta.ca/~myerssmi/home.html 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 F.S. Stuart Chapin Professor of Ecology

Department of Biology and Wildlife; Institute of Arctic Biology: University of Alaska Fairbanks 193 Arctic Health P.O. Box 757000 Fairbanks AK 99775 United States

(907) 474-7922 (907) 474-6967 Associated investigator Jennifer W. Harden USGS, Adjunct Professor of Soil Science, University of Alaska Fairbanks

U.S. Geological Survey 345 Middlefield Road, MS 962 Menlo Park CA 94025 United States

(650) 329-4949 (650) 329-4920 Associated investigator A. David McGuire Assistant Professor of Landscape Ecology

Alaska Cooperative Fish and Wildlife Research Unit University of Alaska Fairbanks Irving I Building Fairbanks AK 99775 United States

(907) 474-6242 (907) 474-7872 Associated investigator 2005-11-12 This data set contains flux measurements for the transect from the center of the BBC collapse scar (0m) into the surrounding fire scar (30m) of the Survey Line Fire (burned in June-July 2001). We measured CO2, H2O and CH4 fluxes every one to two weeks throughout the growing season of 2004. We measured fluxes at permanent plots established from the center of the bog into the surrounding burn at 0, 6, 12, 18, 24, and 30 m on the east and west side of the transect. Flux measurements on either side of the transect were treated as replicates. CO2 and H2O fluxes were measured using a Li-840 infrared gas analyzer (Licor Inc., Lincoln, NB, USA). The IRGA was calibrated before each trip to the field using a span of 400 ppm and a zero of N2 gas. We logged data every 0.5 seconds for 2 min. To account for measurement variability, we conducted two measurements in succession at each location, after flushing the chamber for accumulated CO2 and H2O. For the flux measurements, we built plexiglass chambers with pipe insulation bases with dimensions of 61 × 61 × 30.5 cm, 61 × 61 × 61 cm, or 61 × 61 × 122 cm. The shorter chambers were used in the collapse portion of the transect. Chambers included fans for air circulation, inlet and outlet ports for CO2 measurements, or just outlet ports for CH4 measurements (Carroll and Crill 1997). We placed chambers directly on the soil surface and used pipe insulation and plastic sheeting to make a solid seal during the measurement. To estimate the volume for each chamber measurement, we measured the distance to the soil surface from a 6 cm grid suspended 30 cm above each plot, the surface area was then used to calculate the chamber volume for each measurement. Dark measurements were used to determine CO2 derived from soil and root respiration (ecosystem respiration) using a two-layer cloth shroud with a reflective surface to exclude solar radiation. To estimate net ecosystem exchange (NEE) of CO2, we conducted chamber measurements of plant and soil respiration and plant uptake. NEE data are not reported as NEEmax (NEE at PAR > 1000 µmol m-2 s-1) as PAR only once surpassed 1000 µmol m-2 s-1 during field measurement trips in 2004. Smoke from wildfires through July and August reduced PAR and likely influenced relationships between PAR and NEE. After experimenting with different incubation lengths, we conducted 40 min methane flux measurements to compensate for low flux rates and large chambers. Syringe samples were taken after deploying the chamber and at 8 min intervals, yielding 6 gas samples. We analyzed gas samples using a Varian CP-3800 gas chromatograph with a flame ionization detector (Varian Inc., Palo Alto, CA, USA). We calibrated the GC before each use using standard gases (CH4: 99.9 and 1020 ppb; CO2: 284 and 10195 ppm). We calculated CO2, H2O and CH4 flux rates using linear regressions of gas concentrations over time. We excluded all data sets that did not exhibit initial linear fluxes (r2 < 0.9). fluxes water carbon dioxide methane PAR active layer soil moisture biomass soil temperature 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.

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http://www.lter.uaf.edu/data_detail.cfm?datafile_pkey=190 Site information unavailable -148.3334833 -148.3334833 64.6408 64.6408 2003-08-06 2004-09-18

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

We measured fluxes at permanent plots established from the center of the bog into the surrounding burn at 0, 6, 12, 18, 24, and 30 m on the east and west side of the transect. Flux measurements on either side of the transect were treated as replicates.

Field methods: We measured CO2, H2O and CH4 fluxes every one to two weeks throughout the growing season of 2004. Lab methods: CO2 and H2O fluxes were measured using a Li-840 infrared gas analyzer (Licor Inc., Lincoln, NB, USA). The IRGA was calibrated before each trip to the field using a span of 400 ppm and a zero of N2 gas. We logged data every 0.5 seconds for 2 min. To account for measurement variability, we conducted two measurements in succession at each location, after flushing the chamber for accumulated CO2 and H2O. For the flux measurements, we built plexiglass chambers with pipe insulation bases with dimensions of 61 × 61 × 30.5 cm, 61 × 61 × 61 cm, or 61 × 61 × 122 cm. The shorter chambers were used in the collapse portion of the transect. Chambers included fans for air circulation, inlet and outlet ports for CO2 measurements, or just outlet ports for CH4 measurements (Carroll and Crill 1997). We placed chambers directly on the soil surface and used pipe insulation and plastic sheeting to make a solid seal during the measurement. To estimate the volume for each chamber measurement, we measured the distance to the soil surface from a 6 cm grid suspended 30 cm above each plot, the surface area was then used to calculate the chamber volume for each measurement. Dark measurements were used to determine CO2 derived from soil and root respiration (ecosystem respiration) using a two-layer cloth shroud with a reflective surface to exclude solar radiation. To estimate net ecosystem exchange (NEE) of CO2, we conducted chamber measurements of plant and soil respiration and plant uptake. NEE data are not reported as NEEmax (NEE at PAR > 1000 µmol m-2 s-1) as PAR only once surpassed 1000 µmol m-2 s-1 during field measurement trips in 2004. Smoke from wildfires through July and August reduced PAR and likely influenced relationships between PAR and NEE. After experimenting with different incubation lengths, we conducted 40 min methane flux measurements to compensate for low flux rates and large chambers. Syringe samples were taken after deploying the chamber and at 8 min intervals, yielding 6 gas samples. We analyzed gas samples using a Varian CP-3800 gas chromatograph with a flame ionization detector (Varian Inc., Palo Alto, CA, USA). We calibrated the GC before each use using standard gases (CH4: 99.9 and 1020 ppb; CO2: 284 and 10195 ppm). We calculated CO2, H2O and CH4 flux rates using linear regressions of gas concentrations over time. We excluded all data sets that did not exhibit initial linear fluxes (r2 < 0.9). Instrumentation used: Li-840 infrared gas analyzer (Licor Inc., Lincoln, NB, USA) and Varian CP-3800 gas chromatograph with a flame ionization detector (Varian Inc., Palo Alto, CA, USA)

geoReference 2003-08-06 2004-09-18

bi-weekly

flux_data.txt flux_data.txt 1 \n \n column \t http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-bnz..&urlTail=/ascii/files/flux_data.txt Year Year Year (yyyy) of measurement integer yyyy -9999 Missing Value DOY DOY Day of year of measurement integer DOY -9999 Missing Value Distance (m) Distance (m) Distance along the transect (0-30m) Integer Distance along the transect (0-30m) -9999 Missing Value NEE_CO2_light measurement (umol/m2/s) NEE_CO2_light measurement (umol/m2/s) Net Ecosystem Exchange, a light measurement of the flux of CO2 from the ecosystem surface (in micromoles per m2 per second) float umol/m2/s real -9999 Missing Value ER_CO2_dark measurement (umol/m2/s) ER_CO2_dark measurement (umol/m2/s) Ecosystem Exchange, a dark measurement of the flux of CO2 from the ecosystem surface indicating soil and plant respiration primarily and excluding photosynthetic plant activity (in micromoles per m2 per second) float umol/m2/s real -9999 Missing Value H2O_Flux (mmol/m2/s) H2O_Flux (mmol/m2/s) Water flux from the ecosystem surface (in millimoles per m2 per second) float mmol/m2/s real -9999 Missing Value CH4_Flux (mg/m2/d) CH4_Flux (mg/m2/d) Methane flux from the ecosystem surface (in millig per m2 per day) float mg/m2/d real -9999 Missing Value Temperature_CO2 (ºC) Temperature_CO2 (ºC) Air Temperature at 240cm height from the ground at the nearest half-hour increment to the CO2 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Temperature_CH4 (ºC) Temperature_CH4 (ºC) Air Temperature at 240cm height from the ground at the nearest half-hour increment to the CH4 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Par_CO2 (umol/m2/s) Par_CO2 (umol/m2/s) PAR at 240cm height from the ground at the nearest half-hour increment to the CO2 flux measurment (in micromoles per m2 per second) float umol/m2/s real -9999 Missing Value Par_CH4 (umol/m2/s) Par_CH4 (umol/m2/s) PAR at 240cm height from the ground at the nearest half-hour increment to the CH4 flux measurment (in micromoles per m2 per second) float umol/m2/s real -9999 Missing Value Soil_Moisture_CO2 (cm3/cm3) Soil_Moisture_CO2 (cm3/cm3) Mean soil moisture at the nearest half-hour increment to the CO2 flux measurment (in cm3 of water per cm3 of soil) float cm3/cm3 real -9999 Missing Value Soil_Moisture_CH4 (cm3/cm3) Soil_Moisture_CH4 (cm3/cm3) Mean soil moisture at the nearest half-hour increment to the CH4 flux measurment (in cm3 of water per cm3 of soil) float cm3/cm3 real -9999 Missing Value Active_Layer (cm) Active_Layer (cm) Active layer depth for the day of the measurement (in cm) double centimeter real -9999 Missing Value Water_Level_CO2 (m) Water_Level_CO2 (m) Water level at the nearest half-hour increment to the CO2 flux measurment (in m) double meter real -9999 Missing Value Water_Level_CH4 (m) Water_Level_CH4 (m) Water level at the nearest half-hour increment to the CH4 flux measurment (in m) double meter real -9999 Missing Value Soil_Temp_5cm_CO2 (ºC) Soil_Temp_5cm_CO2 (ºC) Soil Temperature at 5cm depth in the soil profile at the nearest half-hour increment to the CO2 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_5cm_CH4 (ºC) Soil_Temp_5cm_CH4 (ºC) Soil Temperature at 5cm depth in the soil profile at the nearest half-hour increment to the CH4 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_10cm_CO2 (ºC) Soil_Temp_10cm_CO2 (ºC) Soil Temperature at 10cm depth in the soil profile at the nearest half-hour increment to the CO2 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_10cm_CH4 (ºC) Soil_Temp_10cm_CH4 (ºC) Soil Temperature at 10cm depth in the soil profile at the nearest half-hour increment to the CH4 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_20cm_CO2 (ºC) Soil_Temp_20cm_CO2 (ºC) Soil Temperature at 20cm depth in the soil profile at the nearest half-hour increment to the CO2 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_20cm_CH4 (ºC) Soil_Temp_20cm_CH4 (ºC) Soil Temperature at 20cm depth in the soil profile at the nearest half-hour increment to the CH4 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_50cm_CO2 (ºC) Soil_Temp_50cm_CO2 (ºC) Soil Temperature at 50cm depth in the soil profile at the nearest half-hour increment to the CO2 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Soil_Temp_50cm_CH4 (ºC) Soil_Temp_50cm_CH4 (ºC) Soil Temperature at 50cm depth in the soil profile at the nearest half-hour increment to the CH4 flux measurment (in degrees celcius) double celsius real -9999 Missing Value Biomass (g/m2) Biomass (g/m2) Projected biomass for the day of the measurement (in g per m2) float gramsPerSquareMeter real -9999 Missing Value