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Harvard Forest Data Archive

HF253

Harvard Forest CTFS-ForestGEO Mapped Forest Plot since 2014

Related Publications

Data

Overview

  • Lead: David Orwig, David Foster, Aaron Ellison
  • Investigators:
  • Contact: David Orwig
  • Start date: 2014
  • End date: 2014
  • Status: ongoing
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.54
  • Longitude: -72.18
  • Elevation: 340 to 368 meter
  • Taxa: Acer rubrum (red maple), Ilex verticillata (winterberry), Kalmia latifolia (mountain laurel), Pinus strobus (white pine), Quercus rubra (red oak), Tsuga canadensis (eastern hemlock), Vaccinium corymbosum (highbush blueberry)
  • Release date: 2015
  • Revisions:
  • EML file: knb-lter-hfr.253.2
  • DOI: digital object identifier
  • Related links:
  • Study type: long-term measurement
  • Research topic: biodiversity studies; invasive plants, pests and pathogens; large experiments and permanent plot studies
  • LTER core area: populations, disturbance
  • Keywords: community composition, forest dynamics, hemlock, hemlock woolly adelgid, oak, tree maps
  • Abstract:

    To investigate the forest dynamics across a larger range of scales in which many processes operate, Harvard Forest (HF) researchers, with assistance from the Center for Tropical Forest Science (CTFS) and the Smithsonian Institute’s Forest Global Earth Observatory (ForestGEO), completed an initial census of all woody stems within a 35 ha plot located at the Harvard Forest in 2014. The HF MegaPlot is part of a global array of large-scale plots established by CTFS whose goals are to increase sampling efforts into temperate forests to explore ecosystem processes beyond population dynamics and biodiversity. The geography and size of the HF MegaPlot (500 m x 700 m) is designed to include a continuous, expansive, and varied natural forest landscape. The strategic plot location will yield opportunities for the study of forest dynamics and demography while capturing a large amount of existing NSF funded LTER (Long Term Ecological Research) science infrastructure (e.g. eddy flux towers, gauged sections of a small watershed, existing smaller permanent plots) and a century of observations and studies. The HF MegaPlot will enable an integrated study of ecosystem processes (e.g., biogeochemistry, hydrology, carbon dynamics) and forest dynamics by melding the past with current and future forest research.

  • Methods:

    Plot Establishment and Woody Stem Census

    During March 2010, a professional survey crew delineated a 500m x 700m forest plot with a continuous grid of 20 x 20 m quadrats using a Sokkia SET600 Total Station (Olathe, KS). Each of the 35 vertical columns contained twenty-five quadrats or 1 total ha in area. Half meter steel rods and labeled pvc posts (2.5 cm diam.) marked each of the 875, 20 x 20 quadrat corners and pvc posts (1.25 cm diam.) marked each 10 x 10 subsection. Elevation of each quadrat corner was also recorded using the total station.

    During the summers of 2010 and 2011, all woody stems at least 1 cm dbh were measured to the nearest 0.1 cm at 1.3 m height (called the point of measure or POM) and recorded using methods adopted from Condit (1998). If a stem was irregular or damaged at 1.3 m, then an alternative POM was recorded and used. Individual stems were tagged with uniquely numbered six digit metal tags (National Band and Tag Company, Newport, KY) and attached to the tree with an aluminum nail angled downward if at least 8 cm dbh or with plastic coated copper wire if less than 8 cm dbh. For multiple-stemmed individuals the dbh of the largest stem was considered the main stem, along with the number and dbh of other stems at least 1 cm dbh. Each stem’s POM was painted with a 2.5 cm by 15 cm horizontal stripe of yellow road paint. Species identification was recorded at the time of measurement. All dead stems at least 5 cm dbh, still standing, and greater than 45 degrees from horizontal were also recorded during this initial census period. The swamp section located in the center of the ForestGEO plot containing dense shrubs was sampled when frozen during the winter months of 2012-2014. Nomenclature follows Haines (2011).

    Stem Mapping

    Each tagged stem was mapped by hand within 10 x 10 m segments of each quadrat by estimating their location to within 0.1 m on a map data sheet drawn to scale with a dot. Each map was then scanned and converted into a jpeg for further analysis. Using Image J version 1.46, an open-source Java image processing program (Rasband 2012), each dot (stem) was digitized and then converted to local x,y coordinates within a quadrat using R (R Core Team 2013) and the CTFS R package (Condit 2012).

    References

    Condit, R. 1998. Tropical forest census plots: methods and results from Barro Colorado Island, Panama and a comparison with other plots. Springer-Verlag, Berlin and R.G. Landes Company, Georgetown, TX.

    Condit, R., 2012. CTFS R Package. http://ctfs.arnarb.harvard.edu/Public/CTFSRPackage.

    Haines, A. 2011. Flora Novae Angliae, a Manual for the Identification of Native and Naturalized Higher Vascular Plants of New England. Yale University Press, New Haven, CT.

    Rasband WS. 2012. ImageJ, U.S. National Institutes of Health, Bethesda, Maryland, USA (imagej.nih.gov/ij/).

    R Core Team. 2013. R: A language and environment for statistical computing. R Foundation for Statistical Computing. Vienna.

  • 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:

    Orwig D, Foster D, Ellison A. 2015. Harvard Forest CTFS-ForestGEO Mapped Forest Plot since 2014. Harvard Forest Data Archive: HF253.

Detailed Metadata

hf253-01: elevation

  1. col.x: x coordinate, matching gx of plot coordinate system in Tree and Stem tables, where called gx (unit: meter / missing value: NA)
  2. col.y: y coordinate, matching gy of plot coordinate system in Tree and Stem tables (unit: meter / missing value: NA)
  3. col.elev: elevation; in some plots, it is absolute elevation above-sea-level, but in other plots, relative elevation (unit: meter / missing value: NA)
  4. mat.1: matrix of elevation data in format needed by map, image, contour programs. The columns of the matrix are columns in the plot (x dimension), and rows of the matrix are rows in the plot (y dimension). Most plots have elevation recorded over a grid of 5x5 m, so the dimensions of the matrix [dim(elev$mat)] are 1+ydim/5, 1+xdim/5, with the 1 added because the elevation is recorded at all plot edges. Counterintuitively, image and contour functions of R require this matrix be transposed for the map to be right, ie, image(t(elev$mat)) works but image(elev$mat) is a faulty reflection of reality. (unit: meter / missing value: NA)
  5. mat.2: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  6. mat.3: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  7. mat.4: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  8. mat.5: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  9. mat.6: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  10. mat.7: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  11. mat.8: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  12. mat.9: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  13. mat.10: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  14. mat.11: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  15. mat.12: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  16. mat.13: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  17. mat.14: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  18. mat.15: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  19. mat.16: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  20. mat.17: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  21. mat.18: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  22. mat.19: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  23. mat.20: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  24. mat.21: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  25. mat.22: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  26. mat.23: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  27. mat.24: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  28. mat.25: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  29. mat.26: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  30. mat.27: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  31. mat.28: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  32. mat.29: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  33. mat.30: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  34. mat.31: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  35. mat.32: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  36. mat.33: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  37. mat.34: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  38. mat.35: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  39. mat.36: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  40. mat.37: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  41. mat.38: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  42. mat.39: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  43. mat.40: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  44. mat.41: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  45. mat.42: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  46. mat.43: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  47. mat.44: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  48. mat.45: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  49. mat.46: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  50. mat.47: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  51. mat.48: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  52. mat.49: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  53. mat.50: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  54. mat.51: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  55. mat.52: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  56. mat.53: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  57. mat.54: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  58. mat.55: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  59. mat.56: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  60. mat.57: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  61. mat.58: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  62. mat.59: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  63. mat.60: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  64. mat.61: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  65. mat.62: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  66. mat.63: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  67. mat.64: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  68. mat.65: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  69. mat.66: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  70. mat.67: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  71. mat.68: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  72. mat.69: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  73. mat.70: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  74. mat.71: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  75. mat.72: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  76. mat.73: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  77. mat.74: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  78. mat.75: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  79. mat.76: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  80. mat.77: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  81. mat.78: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  82. mat.79: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  83. mat.80: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  84. mat.81: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  85. mat.82: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  86. mat.83: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  87. mat.84: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  88. mat.85: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  89. mat.86: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  90. mat.87: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  91. mat.88: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  92. mat.89: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  93. mat.90: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  94. mat.91: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  95. mat.92: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  96. mat.93: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  97. mat.94: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  98. mat.95: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  99. mat.96: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  100. mat.97: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  101. mat.98: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  102. mat.99: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  103. mat.100: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  104. mat.101: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  105. mat.102: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  106. mat.103: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  107. mat.104: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  108. mat.105: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  109. mat.106: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  110. mat.107: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  111. mat.108: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  112. mat.109: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  113. mat.110: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  114. mat.111: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  115. mat.112: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  116. mat.113: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  117. mat.114: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  118. mat.115: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  119. mat.116: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  120. mat.117: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  121. mat.118: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  122. mat.119: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  123. mat.120: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  124. mat.121: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  125. mat.122: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  126. mat.123: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  127. mat.124: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  128. mat.125: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  129. mat.126: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  130. mat.127: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  131. mat.128: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  132. mat.129: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  133. mat.130: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  134. mat.131: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  135. mat.132: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  136. mat.133: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  137. mat.134: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  138. mat.135: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  139. mat.136: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  140. mat.137: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  141. mat.138: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  142. mat.139: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  143. mat.140: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  144. mat.141: matrix of elevation data in format needed by map, image, contour programs (unit: meter / missing value: NA)
  145. xdim: plot x dimension, corresponding to plot and matrix columns (unit: meter / missing value: NA)
  146. ydim: plot y dimension, corresponding to plot and matrix rows (unit: meter / missing value: NA)

hf253-02: species codes

  1. sp: The species mnemonic. Full Latin name can be found in the R Analytical Species Table (spptable) for each plot, or in the Taxonomy Report at http:/ctfs.arnarb.harvard.edu/CTFSReports. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table
  2. latin: full genus and species name
  3. genus: genus
  4. species: species
  5. family: family according to APG; Harvard Forest used Haines (2011) for taxonomic nomenclature, and therefore used the following nomenclature for several species mnemonics: viburnum lantanoides was used for vibual, viburnum nudum was used for vibuca, prunus pensylvanica was used for prupe, ilex mucronata was used for nemomu, cratsp and cratxx were combined to cratsp
  6. species.id: unique species identifier in MySQL database; seldom needed
  7. authority: taxanomic authority for species name
  8. id.level: level of identification: can be species, genus, or family; none means no identification at all; multiple indicates that a code includes a mix of more than one species
  9. syn: synonyms formerly used in the plot
  10. subsp: subspecies name
  11. db: database

hf253-03: trees 2014

  1. tree.id: unique tree identifier in CTFS database. Useful to be certain in matching trees.
  2. stem.id: unique stem identifier in CTFS database. Useful to be certain in matching stems.
  3. tag: tag number used in the field
  4. stem.tag: tag number on the individual stem, if present
  5. sp: species mnemonic. Full Latin name can be found in the R Analytical Species Table (spptable) for each plot, or in the Taxonomy Report at http:/ctfs.arnarb.harvard.edu/CTFSReports. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table.
  6. quadrat: quadrat designation
  7. gx: x coordinate within the plot, relative to one edge of the plot (unit: meter / missing value: NA)
  8. gy: y coordinate within the plot, relative to one edge of the plot (unit: meter / missing value: NA)
  9. dbh.id: unique identifier of a single measurement in the CTFS database
  10. census.id: numeric identifier of the census
  11. dbh: diameter of the stem (unit: centimeter / missing value: NA)
  12. pom: point-of-measure, where the diameter was taken, identical to hom, but a character variable with only 2 decimal places. Value is assumed to be at 1.3m, so appears often as 0, which means 1.3m. (unit: meter / missing value: NA)
  13. hom: height-of-measure, identical to pom but a numeric variable with full precision. Value is assumed to be at 1.3m, so it appears often as 0, which means 1.3m. (unit: meter / missing value: NA)
  14. exact.date: date on which the steam was measured
  15. df.status: status taken from the DFtemp table of the CTFS database: alive, dead, lost_stem, missing, or prior. Alive (A) and dead (D) refer to the entire tree, so if any stem is alive, the tree is alive, and a tree is only dead when every stem is dead. Status = 'lost_stem' indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem. Status = 'missing' (M) are cases where dbh are codes for a tree were not given, so it is not certain whether the tree was alive or dead. Status = 'prior' (P) indicates a tree had not yet recruited at this census. The lost_stem status is now deprecated, since it should always be safer to check stemID to determine whether a tree's measurement changed stems between censuses.
    • alive: refers to the entire tree, so if any stem is alive, the tree is alive
    • dead: a tree is only dead when every stem is dead
    • lost_stem: indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem stem
    • missing: dbh codes for a tree not given, so not certain whether tree is alive or dead
    • prior: tree had not yet recruited at this census
  16. codes: codes for the measurement as recorded in the field
    • M: Multiple: the parent/biggest stem in the multiple
    • L: Leaning: a stem that has a significant lean
    • P: Prone: stems that are growing parallel to the ground
    • U: Uproot: a stem's root ball is partially or fully uprooted. This code might be combined with Prone, if the stem is fully uprooted.
    • B: Broken Stem: a stem that has been snapped but is still attached
    • C: Crown Dead: a crown that has been defoliated or killed in some other way
    • D: Dead: all dead stems over 5cm at DBH get a tag and this code
    • N: Dendrometer: the stem has a dendro band attached
    • T: Other Tag: there is another tag present on stem. Tag number recorded in comments.
    • Q: Equipment: other science equipment is attached to the tree
    • S: Dead Re-Sprout: a stem that has sprouted from the roots of a dead stem
    • I: Irregular: stems that have misshapen boles. This code is used to help determine C storage.
    • O: Broken Top: stems that have the top or large part of the top missing. This code means that the broken piece is no longer attached to the stem.
  17. no.stems: number of living stems on the date of measurement (unit: number / missing value: NA)
  18. jd: julian date, for date arithmetic (unit: nominalDay / missing value: NA)
  19. status: abbreviated version of status, for compatibility with earlier versions of functions in the CTFS R package
    • A: alive
    • D: dead
    • M: missing
    • P: prior
  20. agb: above-ground-biomass of the stem, in Mg (= metric tons or 10^6 grams). Some are NA. agb calculation in this table based on volume allometry published for tropical trees, then uses published wood density for individual species. (unit: megagram / missing value: NA)

hf253-04: stems 2014

  1. tree.id: unique tree identifier in CTFS database. Useful to be certain in matching trees
  2. stem.id: unique stem identifier in CTFS database. Useful to be certain in matching stems.
  3. tag: tag number used in the field
  4. stem.tag: tag number on the individual stem, if present
  5. sp: species mnemonic. Full Latin name can be found in the R Analytical Species Table (spptable) for each plot, or in the Taxonomy Report at http:/ctfs.arnarb.harvard.edu/CTFSReports. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table.
  6. quadrat: quadrat designation
  7. gx: x coordinate within the plot, relative to one edge of the plot (unit: meter / missing value: NA)
  8. gy: y coordinate within the plot, relative to one edge of the plot (unit: meter / missing value: NA)
  9. dbh.id: The unique identifier of a single measurement in the CTFS database
  10. census.id: numeric identifier of the census
  11. dbh: diameter of the stem (unit: centimeter / missing value: NA)
  12. pom: point-of-measure, where the diameter was taken, identical to hom, but a character variable with only 2 decimal places. Value is assumed to be at 1.3m, so appears often as 0, which means 1.3m. (unit: meter / missing value: NA)
  13. hom: height-of-measure, identical to pom but a numeric variable with full precision. Value is assumed to be at 1.3m, so it appears often as 0, which means 1.3m. (unit: meter / missing value: NA)
  14. exact.date: date on which the steam was measured
  15. df.status: status taken from the DFtemp table of the CTFS database: alive, dead, lost_stem, missing, or prior. Alive (A) and dead (D) refer to the entire tree, so if any stem is alive, the tree is alive, and a tree is only dead when every stem is dead. Status = 'lost_stem' indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem. Status = 'missing' (M) are cases where dbh are codes for a tree were not given, so it is not certain whether the tree was alive or dead. Status = 'prior' (P) indicates a tree had not yet recruited at this census. The lost_stem status is now deprecated, since it should always be safer to check stemID to determine whether a tree's measurement changed stems between censuses.
    • alive: refers to the entire tree, so if any stem is alive, the tree is alive
    • dead: a tree is only dead when every stem is dead
    • lost_stem: indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem stem
    • missing: dbh codes for a tree not given, so not certain whether tree is alive or dead
    • prior: tree had not yet recruited at this census
  16. codes: codes for the measurement as recorded in the field
    • M: Multiple: the parent/biggest stem in the multiple
    • L: Leaning: a stem that has a significant lean
    • P: Prone: stems that are growing parallel to the ground
    • U: Uproot: a stem's root ball is partially or fully uprooted. This code might be combined with Prone, if the stem is fully uprooted.
    • B: Broken Stem: a stem that has been snapped but is still attached
    • C: Crown Dead: a crown that has been defoliated or killed in some other way
    • D: Dead: all dead stems over 5cm at DBH get a tag and this code
    • N: Dendrometer: the stem has a dendro band attached
    • T: Other Tag: there is another tag present on stem. Tag number recorded in comments.
    • Q: Equipment: other science equipment is attached to the tree
    • S: Dead Re-Sprout: a stem that has sprouted from the roots of a dead stem
    • I: Irregular: stems that have misshapen boles. This code is used to help determine C storage.
    • O: Broken Top: stems that have the top or large part of the top missing. This code means that the broken piece is no longer attached to the stem.
  17. count.pom: number of POMs (HOMs) for the same stem in this census (unit: number / missing value: NA)
  18. jd: julian date, for date arithmetic (unit: nominalDay / missing value: NA)
  19. status: abbreviated version of status, for compatibility with earlier versions of functions in the CTFS R package
    • A: alive
    • D: dead
    • M: missing
    • P: prior
  20. agb: above-ground-biomass of the stem, in Mg (=metric tons or 10^6 grams). Some are NA. agb calculation in this table based on volume allometry published for tropical trees, then uses published wood density for individual species. (unit: megagram / missing value: NA)