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Harvard Forest Data Archive

HF221

Respiration of Coarse Woody Debris in the Clearcut Site at Harvard Forest in 2011

Related Publications

Data

Overview

  • Lead: Melanie Vanderhoof, Christopher Williams
  • Investigators:
  • Contact: Christopher Williams
  • Start date: 2011
  • End date: 2011
  • Status: completed
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.534 to +42.546
  • Longitude: -72.183 to -72.174
  • Elevation: 360 to 403 meter
  • Taxa:
  • Release date: 2014
  • Revisions:
  • EML file: knb-lter-hfr.221.4
  • DOI: digital object identifier
  • Related links:
  • Study type: short-term measurement
  • Research topic: forest-atmosphere exchange
  • LTER core area: organic matter
  • Keywords: clearcuts, coarse woody debris, decomposition, respiration, timber harvest
  • Abstract:

    This study explored the effects of log position and microclimate variability on the rates of coarse woody debris (CWD) respiration. The rates of respiration of downed Norway spruce (Picea abies) logs were repeatedly measured in-situ using an LI-6200 gas analyzer. Treatments included native logs in the clearcut site, native logs in a neighboring mature spruce stand, and logs transferred from the clearcut site to the mature spruce stand.

  • Methods:

    Sampled logs were Norway spruce, 50 cm in length (cut to size in April 2011), within two diameter size classes (8-13 cm and 15-20 cm), and two decay classes (decay class 2 and 3) (as defined by Harmon and Sexton (1996)). Log-level respiration and associated measurements for each log were measured seven times in varying environmental conditions between 26-May-2011 and 20-July-2011. The sample consisted of 48 logs, comprising three treatment groups of 16 logs each (four logs of two size classes of two decay classes). The treatment groups consisted of, 1) mature spruce stand, 2) transfer (spruce logs transferred from clearcut to mature forest site), and 3) clearcut site. Measurements were taken in-situ under ambient conditions to simulate existing conditions to the extent possible. Logs were placed one at a time inside an air tight plastic chamber with a wire rack at the bottom of the chamber to allow for air circulation around the log. An LI-6200 infrared gas analyzer pumped air through the chamber in a closed loop at a set rate. A fan was installed inside the chamber to ensure adequate air circulation. Log-level respiration was calculated as grams of CO2 emitted per unit of wood surface per unit of time.

  • Use:

    This dataset is released to the public under Creative Commons license CC BY (Attribution). Please keep the designated contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement.

  • Citation:

    Vanderhoof M, Williams C. 2014. Respiration of Coarse Woody Debris in the Clearcut Site at Harvard Forest in 2011. Harvard Forest Data Archive: HF221.

Detailed Metadata

HF221-01: respiration

  1. tag: number on metal tag attached to each log section
  2. datetime: date and time of measurement
  3. date: date of measurement
  4. time: time of measurement
  5. site: study site
  6. treatment: treatment groups
  7. log.weight: wet weight of log at time of each measurement (unit: gram / missing value: NA)
  8. dry.weight: oven dried weight of log (unit: gram / missing value: NA)
  9. water.content: percent log water content derived from dry and wet log weights (unit: dimensionless / missing value: NA)
  10. weather: weather condition at time of measurement
  11. last.rain: time since last rain
    • 1: less than eight hours
    • 2: less than twenty four hours
    • 3: between twenty four and forty eight hours
    • 4: more than forty eight hours
  12. log.temp: log temperature (unit: celsius / missing value: NA)
  13. air.temp: air temperature (unit: celsius / missing value: NA)
  14. air.rh: air relative humidity (unit: dimensionless / missing value: NA)
  15. soil.temp: soil temperature (unit: celsius / missing value: NA)
  16. co2.ppm: change in CO2 from start to end of measurement (unit: dimensionless / missing value: NA)
  17. co2.mol: change in CO2 from start to end of measurement (unit: mole / missing value: NA)
  18. air.pressure: air pressure (unit: pascal / missing value: NA)
  19. system.vol: system volume (unit: cubicMeter / missing value: NA)
  20. log.surface: log surface area (unit: squareMeter / missing value: NA)
  21. log.volume: log volume (unit: cubicMeter / missing value: NA)
  22. meas.time: measurement total time (unit: second / missing value: NA)
  23. respiration1: rate of log respiration (unit: gramsPerMeterSquaredPerSecond / missing value: NA)
  24. respiration2: rate of log respiration (unit: gramsPerMeterSquaredPerHour / missing value: NA)