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Harvard Forest Data Archive

HF137

Mapped Trees in CRUI Land Use Project at Harvard Forest 1996-2006

Related Publications

Data

Overview

  • Lead: Timothy Sipe, Richard Bowden, Charles McClaugherty
  • Investigators: Zachary Buzzinotti, Richard Gordon, Mark Norris
  • Contact: Timothy Sipe
  • Start date: 1996
  • End date: 2006
  • Status: completed
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.53 to +42.55
  • Longitude: -72.20 to -72.17
  • Elevation: 335 to 357 meter
  • Taxa: Acer rubrum (red maple), Acer saccharum (sugar maple), Acer pensylvanicum (striped maple), Betula alleghaniensis (yellow birch), Betula lenta (black birch), Betula papyrifera (paper birch), Betula populifolia (grey birch), Castanea dentata (american chestnut), Fagus grandifolia (american beech), Fraxinus americana (white ash), Hamamelis virginiana (witch hazel), Pinus strobus (white pine), Populus grandidentata (bigtooth aspen), Prunus serotina (black cherry), Quercus alba (white oak), Quercus rubra (red oak), Quercus velutina (black oak), Tsuga canadensis (hemlock)
  • Release date: 2009
  • Revisions:
  • EML file: knb-lter-hfr.137.9
  • DOI: digital object identifier
  • Related links:
  • Study type: long-term measurement
  • Research topic: historical and retrospective studies; large experiments and permanent plot studies; physiological ecology, population dynamics and species interactions
  • LTER core area: populations, disturbance
  • Keywords: aboveground biomass, growth, land use, mortality, survival, tree maps, vegetation dynamics
  • Abstract:

    Numerous variables related to land use disturbance and recovery processes influence forest composition, structure, and growth. We measured forest communities in six sites that were formerly plowed, pastured, or continuously forested woodlots in Prospect Hill to test predictions about species composition, stand structure, and productivity in response to agricultural land use legacies.

    A permanent 30 x 50 m plot gridded in 5 x 5 m sub-plots was established in each of the 6 sites. All trees at least 2.5 cm DBH (diameter at breast height, 1.3 m) were mapped visually in the field, marked with an aluminum tag, and their DBH recorded in summer 1996. Individual boles of multi-stemmed trees were measured separately and a composite single DBH was calculated. Standing dead trees were also mapped and their DBH recorded as well. The 1996 data were used to determine above ground woody biomass using allometric equations for individual trees.

    The permanent plots were re-surveyed ten years later in fall 2006. The status of each tree mapped in 1996 was recorded (alive, dead standing, dead fallen, forked) and DBH’s were re-measured. Additional trees that grew across the 2.5 cm DBH threshold during the ten-year period were mapped and their DBH’s measured. Composite diameters and above ground woody biomass were determined for forked trees as in 1996.

    The 2006 re-measurements were used to analyze changes in species composition, stand structure (density, diameter distribution), and mortality patterns among species and size classes, and to calculate net changes in above ground woody biomass across the ten-year period.

  • Methods:

    Plot locations: Plow #1 Site: Prospect Hill Tract, Compartment # III, southern end. Plow #2 Site: Prospect Hill Tract, Compartment # III, southern end. Pasture #1 Site: Prospect Hill Tract, Compartment # I, southeastern edge. Pasture #2 Site: Prospect Hill Tract, Compartment # VIII, central edge. Woodlot #1 Site: Prospect Hill Tract, Compartment # VIII, northeastern edge. Woodlot #2 Site: Prospect Hill Tract, Compartment # VII, central.

  • 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:

    Sipe T, Bowden R, McClaugherty C. 2009. Mapped Trees in CRUI Land Use Project at Harvard Forest 1996-2006. Harvard Forest Data Archive: HF137.

Detailed Metadata

hf137-01: mapped trees

  1. site: site
    • P1: Plow 1
    • P2: Plow 2
    • S1: Pasture 1
    • S2: Pasture 2
    • W1: Woodlot 1
    • W2: Woodlot 2
  2. plot: plot number. Each permanent 30 x 50 m grid has 60 5 x 5 m plots. They are numbered from left to right and top to bottom across the grid. The upper left corner plot is 1 and the lower right corner plot is 60.
  3. tag: tag number. Unique aluminum tag number affixed to trees mapped in 1996 (2200 through 3200). New trees mapped in 2006 that were under the 2.5 cm DBH threshold in 1996 were assigned a unique tag number (4000-range) on the field maps, but no metal tag was affixed to the stems.
  4. grid.x: x-coordinate. Spatial coordinates for the locations of trees mapped in 1996. Coordinates for new trees in 2006 will be added in the future. (unit: meter / missing value: NA)
  5. grid.y: y-coordinate. Spatial coordinates for the locations of trees mapped in 1996. Coordinates for new trees in 2006 will be added in the future. (unit: meter / missing value: NA)
  6. species: species code. A 6-letter genus-species abbreviation for each tree recorded in the plots.
  7. bole1.dbh.1996: diameter at breast height of Bole 1 in 1996 (unit: centimeter / missing value: NA)
  8. bole2.dbh.1996: diameter at breast height of Bole 2 in 1996 (unit: centimeter / missing value: NA)
  9. bole3.dbh.1996: diameter at breast height of Bole 3 in 1996 (unit: centimeter / missing value: NA)
  10. bole4.dbh.1996: diameter at breast height of Bole 4 in 1996 (unit: centimeter / missing value: NA)
  11. bole5.dbh.1996: diameter at breast height of Bole 5 in 1996 (unit: centimeter / missing value: NA)
  12. bole6.dbh.1996: diameter at breast height of Bole 6 in 1996 (unit: centimeter / missing value: NA)
  13. tot.ba.1996: basal area per mapped tree in 1996 (unit: squareCentimeters / missing value: NA)
  14. comp.dbh.1996: diameter at breast height for all individual trees, including a composite DBH for forked trees (unit: centimeter / missing value: NA)
  15. awb.1996: aboveground woody biomass estimated for each tree in 1996 using published species-specific allometric equations (available upon request). (unit: kilogram / missing value: NA)
  16. status.2006: 2006 status for all trees mapped in 1996
    • A: alive
    • DS: dead but standing
    • F: fallen
  17. forked.2006: living and dead stems on forked trees were recorded individually in the field, but these designations are removed in the archived file so that AWB calculations can be made on all living and dead stems.
    • Y: yes for multi-stemmed trees as of 2006
  18. bole1.dbh.2006: diameter at breast height of Bole 1 in 2006 (unit: centimeter / missing value: NA)
  19. bole2.dbh.2006: diameter at breast height of Bole 2 in 2006 (unit: centimeter / missing value: NA)
  20. bole3.dbh.2006: diameter at breast height of Bole 3 in 2006 (unit: centimeter / missing value: NA)
  21. bole4.dbh.2006: diameter at breast height of Bole 4 in 2006 (unit: centimeter / missing value: NA)
  22. bole5.dbh.2006: diameter at breast height of Bole 5 in 2006 (unit: centimeter / missing value: NA)
  23. bole6.dbh.2006: diameter at breast height of Bole 6 in 2006 (unit: centimeter / missing value: NA)
  24. tot.ba.2006: basal area per mapped tree in 2006 (unit: squareCentimeters / missing value: NA)
  25. comp.dbh.2006: diameter at breast height for all individual trees in 2006, including a composite DBH for forked trees (unit: centimeter / missing value: NA)
  26. awb.2006: aboveground woody biomass estimated for each tree in 2006 using published species-specific allometric equations (available upon request). (unit: kilogram / missing value: NA)