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Harvard Forest Data Archive

HF243

Partitioning the Components of Soil Respiration in a Trenching Experiment at Harvard Forest 2009-2010

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Data

Overview

  • Lead: Jim Tang, Kathleen Savage, Eric Davidson
  • Investigators:
  • Contact: Kathleen Savage
  • Start date: 2009
  • End date: 2010
  • Status: completed
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.539 to +42.542
  • Longitude: -72.185 to -72.180
  • Elevation: 355 to 380 meter
  • Taxa:
  • Release date: 2015
  • Revisions:
  • EML file: knb-lter-hfr.243.4
  • DOI: digital object identifier
  • Related links:
  • Study type: short-term measurement
  • Research topic: forest-atmosphere exchange
  • LTER core area: inorganic nutrients
  • Keywords: carbon cycling, roots, soil moisture, soil respiration, soil temperature
  • Abstract:

    Total soil respiration (Rt) is a combination of autotrophic (Ra) and heterotrophic respiration (Rh). Several methods have been developed to tease out the components of Rt, such as isotopic analyses, and removing Ra input through tree girdling and root exclusion experiments. Trenching involves severing the rooting system surrounding a plot to remove the Ra component within the plot. This method has some potential limitations. Reduced water uptake in trenched plots could change soil water content, which is one of the environmental controllers of Rt in many ecosystems. Eliminating root inputs could reduce heterotrophic decomposition of SOM via lack of priming. On the other hand, the severed dead roots may temporarily increase available carbon substrate for Rh. We utilized the trenching method to partition the autotrophic and heterotrophic components of soil respiration in an oak dominated forest with the footprint of the LPH tower.

  • Methods:

    Automated Chamber Respiration

    Within the footprint of the LPH eddy covariance tower, automated respiration chambers were utilized in conjunction with the trenching method to partition Rt into its components, Rh and Ra. In the late fall of 2008, a trench was dug (to 1m depth) around a 5x5m area, severing all roots leading into the treatment plot. Plastic tarp was placed along the walls of the trench and then backfilled. Three automated chambers were placed in each of the trenched and un-trenched plot. Fluxes, along with soil temperature and moisture, were measured at hourly rates from early spring through late fall of 2009 and 2010. Measurements from the non-trenched plot represent the combined Rh and Ra components, Rt. Fluxes from the trenched plot represent, Rh and the difference (Rt-Rh) represents Ra.

  • 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:

    Tang J, Savage K, Davidson E. 2015. Partitioning the Components of Soil Respiration in a Trenching Experiment at Harvard Forest 2009-2010. Harvard Forest Data Archive: HF243.

Detailed Metadata

hf243-01: soil respiration

  1. datetime: date and time
  2. year: year
  3. doy: day of year (unit: nominalDay / missing value: NA)
  4. time: time
  5. doy.time: day of year, time (unit: nominalDay / missing value: NA)
  6. carbon.flux: carbon flux (unit: milligramPerMeterSquaredPerHour / missing value: NA)
  7. treatment: treatment
    • T: trenched
    • C: control
  8. soil.temp.10: soil temperature at 10 cm (unit: celsius / missing value: NA)
  9. soil.mois.2.8: percent soil moisture at 2-8 cm (unit: dimensionless / missing value: NA)
  10. soil.mois.8.16: percent soil moisture at 8-16 cm (unit: dimensionless / missing value: NA)
  11. airt.temp: air temperature (unit: celsius / missing value: NA)