TDR data for 0-70 cm:

Measurements of soil water content at all grid points for contour plots.


1.0 DOCUMENT INFORMATION
1.1 Document Title: TDE Soil Water Data By TDR for 0-70 cm
1.2 Revision Date:  23 August 2005
1.3 Document Summary:   Periodic measurements of soil water content by TDR for the 0-35 cm depth increment throughout the period from 1993-2000.
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)
Environmental Sciences Division
Oak Ridge National Laboratory
Building 1059, P.O. Box 2008
Oak Ridge, TN 37831-6422
2.2 Title Of Investigation:
Walker Branch Throughfall Displacement Experiment (TDE)

 3.0 DATA SUMMARY
Soil water content data by date, treatment, and specific positions across the slope of the TDE experimental site for the 0-70 cm depth increment.

 4.0 PROCEDURES
Soil water content (%, v/v) was measured with a time domain reflectometer (TDR; Soil Moisture Equipment Corp., Santa Barbara, California) following the procedure of Topp and Davis (1985) as documented for soils with high coarse fraction content (Drungil et al. 1987).  Three hundred ten sampling locations were installed at an 8 x 8 meter spacing across the site giving more than 100 soil water monitoring locations per plot.  At each location two pairs of TDR waveguides were installed in a vertical orientation (0-0.35 and 0-0.7 m).  The surface (0-0.35 m) TDR measurements coincide with the zone of maxium root density in these soils.  TDR measurements were obtained biweekly during the growing season and approximately monthly during the dormant season.  The TDR soil water content measurements were adjusted for the coarse fraction of these soils (mean coarse fraction of 14%) and converted to soil water potentials using laboratory derived soil moisture retention curves for the A, A/E and E/B horizons (Hanson et al. 1998).
 

 5.0 OBSERVATION NOTES
None

 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 month.

6.1 Variable, Definition, and Units

6.2 Number of Records: 145 dates;  > 34,000 observations.
6.3 Missing data: Missing data are present and represented by blanks between commas.
6.4 Related Data Sets: Similar data are available for the 0-35 cm depth increment and summary data by year, date, and treatment are also provided.

7.0 KNOWN ERRORS AND QUALITY ASSESSMENT
These daily data have been checked for errors.   Bad data and missing data are both represented by empty cells within the data matrix.

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, N.T. Edwards, and M.A. Huston.  1995.  Field performance of the Walker Branch Throughfall Displacement Experiment,   In:  A. Jenkins, R.C. Ferrier, and C. Kirby, eds., Ecosystem Manipulation Experiments: scientific approaches, experimental design and relevant results, Ecosystem Research Report #20, Commission of the European Communities, pp. 307-313

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.

Hanson P.J. 2000.  Large-scale Water Manipulations -- chapter 23 In: O.E. Sala, R.B. Jackson, H.A. Mooney, and R.W. Howarth, eds.  Methods in Ecosystem Science, Springer-Verlag, New York.  pp. 341-352

Hanson, P.J. , D.E.Todd and J.S. Amthor.   2001.  A six year study of sapling and large-tree growth and mortality responses to natural and induced variability in precipitation and throughfall.   Tree Physiology 21:345-358

Hanson PJ, Todd DE, Huston MA (2003) Walker Branch Throughfall Displacement Experiment (TDE) In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 8-31

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.

0-70 cm TDR soil water content data for 1993 (Days of the year 14, 55, 119, 142, 161, 193, 204, 222, 243, 274, 299, 327, 354)
0-70 cm TDR soil water content data for 1994 (Days of the year 38, 42, 63, 98, 116, 137, 159, 171, 196, 213, 234, 262, 284, 326, 346)
0-70 cm TDR soil water content data for 1995 (Days of the year 17, 69, 95, 123, 144, 164, 177, 198, 212, 235, 271, 289, 334)
0-70 cm TDR soil water content data for 1996 (Days of the year 25, 60, 87, 120, 142, 159, 173, 184, 198, 214, 229, 243, 257, 270, 284, 305, 339)
0-70 cm TDR soil water content data for 1997 (Days of the year 6, 56, 84, 107, 161, 176, 189, 205, 216, 255, 269, 293)
0-70 cm TDR soil water content data for 1998 (Days of the year 20, 149, 173, 187, 202, 216, 231, 252, 279, 321)
0-70 cm TDR soil water content data for 1999 (Days of the year 12, 99, 127, 172)
0-70 cm TDR soil water content data for 2000 (Days of the year 70, 136, 159, 215, 242, 350)
0-70 cm TDR soil water content data for 2001 (Days of the year 78, 136, 156, 183, 211, 248, 312)
0-70 cm TDR soil water content data for 2002 (Days of the year 14, 64, 129, 142, 157, 168, 184, 200, 212, 225, 240, 256, 297, 364)
0-70 cm TDR soil water content data for 2003 (Days of the year 66, 91, 132, 149, 170, 190, 238, 260, 296, 349)
0-70 cm TDR soil water content data for 2004 (Days of the year 84, 99, 119, 134, 153, 166, 191, 204, 219, 258, 306, 351)
0-70 cm TDR soil water content data for 2005 (Days of the year 56, 62, 104, 118, 132, 147, 158,  174, 189, 206, 217, 234.....)