Annual Tree Growth Data

for the Walker Branch Throughfall Displacement Experiment (TDE)

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

2.1 Investigator and data set contact:

P.J. Hanson (
Research Staff Member
Environmental Sciences Division
Oak Ridge National Laboratory
P.O. Box 2008, Building 1059
Oak Ridge, TN 37831-6422
2.2 Title Of Investigation:
Walker Branch Throughfall Displacement Experiment (TDE)

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.

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).

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


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

6.2 Number of Records: 227 trees
6.3 Missing data: Missing data is represented by
6.4 Related Data Sets:  Intra-annual tree growth data at approximately biweekly resolution are also available.

Negative values do occur and should not be thrown out.

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


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.


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