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Annual Tree Growth Data

for the Walker Branch Throughfall Displacement Experiment (TDE)

1.0 DOCUMENT INFORMATION
1.1 Document Title: TDE annual tree growth data
1.2 Revision Date:  Dec 18, 2000
1.3 Document Summary:  Tree basal area growth for 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
1.4 Sponsor: Office of Biological and Environmental Research, U. S. DOE

 2.0 INVESTIGATOR
2.1 Investigator and data set contact:

P.J. Hanson (hansonpj@ornl.gov)
Research Staff Member
Environmental Sciences Division
Oak Ridge National Laboratory
P.O. Box 2008, Building 1059
Oak Ridge, TN 37831-6422

 3.0 DATA SUMMARY
Dendrometer based, annual tree grwoth data for the five dominant tree species on the TDE site:  Acer rubrum, Liriodendron tulipifera, Nyssa sylvatica, Quercus alba, and Quercus prinus.

 4.0 PROCEDURES
Measurements of all individuals greater than 0.1 m dbh and a record of their presence/mortality were recorded annually.  Quercus alba L., Q. prinus L., Acer rubrum L., Liriodendron tulipifera L., and Nyssa sylvatica Marsh. trees greater than 0.2 m dbh were fitted with dendrometer bands (170 trees) for biweekly measurements of stem circumference during each growing season.    A single dendrometer measurement consists of duplicate digital caliper measurements (0.01 mm resolution) of the distance between two reference holes in stainless steel dendrometer bands (25.4 mm wide x 0.2 mm thick) installed around the circumference of each tree (McLaughlin and Downing 1996). Measured changes in the circumference of each tree were combined with information on its initial stem diameter to obtain the change in stem basal area over time (mm2 day-1 or mm2 year-1).  Dendrometer bands were installed on the Q. alba, Q. prinus, and A. rubrum trees prior to the 1993 growing season and bands for L. tulipifera and N. sylvatica were added in February of 1994.  All dendrometer bands were installed during the dormant season, ahead of the initial growth measurements, to eliminate potential first year bias in the dendrometer band measurements (Keeland and Sharitz 1993).

 5.0 OBSERVATION NOTES
Measurements of N. sylvatica and L. tulipifera did not begin until 1994.

 6.0 DATA ORGANIZATION

Data are provided in comma delimeted text files where the first line includes the variable names and subsequent lines include the following data by year.

6.1 Variable, Definition, and Units

Column 1 = PlantID
Arbitrary individual tree identification number


Column 2 = SPC

Species identification code
AR = Acer rubrum
NS = Nyssa sylvatica
LT = Liriodendron tulipifera
QA = Quercus alba
QP = Quercus prinus


Column 3 = TRT

Treatment of the TDE experiment
W = wet
A = ambient
D = dry


Column 4 = SLP

Slope position on the TDE site
U = upper
M = middle
B = bottom


Column 5 = Y

Y coordinate of the XY corrdinate system of the TDE experiment (Values range from 1 to 30)


Column 6 = X

X coordinate of the XY corrdinate system of the TDE experiment (Values range from 1 to 10)


Column 7 = GR1993

Basal area growth rate per tree for 1993 in mm2 y-1


Column 8 = GR1994

Basal area growth rate per tree for 1994 in mm2 y-1


Column 9 = GR1995

Basal area growth rate per tree for 1995 in mm2 y-1


Column 10 = GR1996

Basal area growth rate per tree for 1996 in mm2 y-1


 Column 11 = GR1997

Basal area growth rate per tree for 1997 in mm2 y-1


 Column 12 = GR1998

Basal area growth rate per tree for 1998 in mm2 y-1


 Column 13 = GR1999

Basal area growth rate per tree for 1999 in mm2 y-1


Column 14 = GR2000

Basal area growth rate per tree for 2000 in mm2 y-1

7.0 KNOWN ERRORS AND QUALITY ASSESSMENT
Negative values do occur and should not be thrown out.

8.0 NOTES
8.1 Limitations of the data:     None.
8.2 Known Problems With The Data:     None.
8.3 Usage Guidance:     None.

 9.0 REFERENCES:

Hanson, P.J. , D.E.Todd and J.S. Amthor.   (in press)  A six year study of sapling and large-tree growth and mortality responses to natural and induced variability in precipitation and throughfall.   Tree Physiology (in press).

Hanson, P.J., D.E. Todd, M.A. Huston, J.D. Joslin, Jennifer Croker, and R. M. Augé. 1998.  Description and field performance of the Walker Branch Throughfall Displacement Experiment: 1993-1996, ORNL/TM-13586, Oak Ridge National Laboratory, Oak Ridge, Tennessee.
None

 10.0 DATA LISTING

Click on the following to view data for the listed year.
Once open the files can exported as text files with the 'Save As' command.

Annual tree growth file