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Investigation:

ND-02 (Davidson / Stone / Markewitz / Carvalho / Sa / Vieira / Moutinho / Figueiredo)

LBA Dataset ID:

ND02_REE_SOIL_VWC

Originator(s):

1. BELK, E.L.
2. MARKEWITZ, D.
3. RASMUSSEN, T.
      4. DE CARVALHO, C.J.R.
5. NEPSTAD, D.C.
6. DAVIDSON, E.A.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

A throughfall reduction experiment was established in the Tapajos National Forest of east-central Amazonia (Brazil) to test the potential effects of severe water stress during prolonged droughts. Using Time-Domain Reflectometry observations of water contents from this experiment we developed a dynamic, one-dimensional, vertical flow model to elucidate our understanding of hydrologic processes within these tall-stature forests on well-drained, upland, deep Oxisols and to simulate changes in the distribution of soil water. Simulations using 960 days of data were utilized.

Beginning Date:

1999-05-19

Ending Date:

2001-05-19

Metadata Last Updated on:

2012-02-15

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO ND-02 Soil Volumetric Water Content, Tapajos National Forest, Brazil :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1061

Documentation/Other Supporting Documents:

LBA-ECO ND-02 Soil Volumetric Water Content, Tapajos National Forest, Brazil :  http://daac.ornl.gov/LBA/guides/ND02_REE_Soil_VWC.html

Citation Information - Other Details:

Belk, E.L., D. Markewitz, T. Rasmussen, E.J.M. Carvalho, D.C. Nepstad, and E.A. Davidson. 2012. LBA-ECO ND-02 Soil Volumetric Water Content, Tapajos National Forest, Brazil. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. http://dx.doi.org/10.3334/ORNLDAAC/1061

Keywords - Theme:

Parameter Topic Term Source Sensor
FORESTS BIOSPHERE TERRESTRIAL ECOSYSTEMS FIELD INVESTIGATION TDR (TIME DOMAIN REFLECTOMETRY PROBE)

Uncontrolled Theme Keyword(s):  HYDRAULIC MODEL, SOIL MOISTURE, VOLUMETRIC WATER CONTENT, VWC

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Pará Western (Santarém) km 67 Seca-Floresta Site -2.75000 -2.75000 -55.00000 -55.00000

Related Publication(s):

Belk, E.L., D. Markewitz, T.C. Rasmussen, E.J. Maklouf Carvalho, D.C. Nepstad, and E.A. Davidson. 2007. Modeling the effects of throughfall reduction on soil water content in a Brazilian Oxisol under a moist tropical forest. Water Resources Research 43(8), W08432, doi:10.1029/2006WR005493.

Belk, Elizabeth L., 2002. Modeling the effects of partial throughfall exclusion on the distribution of soil water in Brazilian Oxisol under tropical moist forest. MS thesis, The University of Georgia. Athens, GA.

Elizabeth L. Belk, Daniel Markewitz, Todd C. Rasmussen, Eduardo J. Maklouf Carvalho, Daniel C. Nepstad, and Eric A. Davidson. 2008. Correction to Modeling the effects of throughfall reduction on soil water content in a Brazilian Oxisol under a moist tropical forest. Water Resources Research, 44, W07701, doi:10.1029/2008WR007190.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data Set Contents:

This data set consists of a comparison of measured and simulated values of VWC from the control plots of the throughfall exclusion experiment.





Spatial coverage:

Study site is the Seca Floresta project in the Tapajos National Forest


Temporal coverage:

May 17, 1999 to Dec. 12, 2001




The data are provided in 4 comma-delimited ASCII data files:




File 1: Seca_Floresta_actual_vs_simulated_VWC_control_plot.csv</b>


Data description: Volumetric water content by depth for actual measured values (prefix A) and model simulated values (prefix S) in the control plot. There are 13 depths.


File organization and contents:


Column Variable Variable description

Number Name

1 Date Sample date

2 Plot_type Plot type: Control or Treatment

3 A30 Measured volumetric water content (cm^3/cm^3) at 30 centimeters

4 A50 Measured volumetric water content (cm^3/cm^3) at 50 centimeters

5 A100 Measured volumetric water content (cm^3/cm^3) at 100 centimeters

6 A200 Measured volumetric water content (cm^3/cm^3) at 200 centimeters

7 A300 Measured volumetric water content (cm^3/cm^3) at 300 centimeters

8 A400 Measured volumetric water content (cm^3/cm^3) at 400 centimeters

9 A500 Measured volumetric water content (cm^3/cm^3) at 500 centimeters

10 A600 Measured volumetric water content (cm^3/cm^3) at 600 centimeters

11 A700 Measured volumetric water content (cm^3/cm^3) at 700 centimeters

12 A800 Measured volumetric water content (cm^3/cm^3) at 800 centimeters

13 A900 Measured volumetric water content (cm^3/cm^3) at 900 centimeters

14 A1000 Measured volumetric water content (cm^3/cm^3) at 1000 centimeters

15 A1100 Measured volumetric water content (cm^3/cm^3) at 1100 centimeters

16 S30 Simulated volumetric water content (cm^3/cm^3) at 30 centimeters

17 S50 Simulated volumetric water content (cm^3/cm^3) at 50 centimeters

18 S100 Simulated volumetric water content (cm^3/cm^3) at 100 centimeters

19 S200 Simulated volumetric water content (cm^3/cm^3) at 200 centimeters

20 S300 Simulated volumetric water content (cm^3/cm^3) at 300 centimeters

21 S400 Simulated volumetric water content (cm^3/cm^3) at 400 centimeters

22 S500 Simulated volumetric water content (cm^3/cm^3) at 500 centimeters

23 S600 Simulated volumetric water content (cm^3/cm^3) at 600 centimeters

24 S700 Simulated volumetric water content (cm^3/cm^3) at 700 centimeters

25 S800 Simulated volumetric water content (cm^3/cm^3) at 800 centimeters

26 S900 Simulated volumetric water content (cm^3/cm^3) at 900 centimeters

27 S1000 Simulated volumetric water content (cm^3/cm^3) at 1000 centimeters

28 S1100 Simulated volumetric water content (cm^3/cm^3) at 1100 centimeters


Example data records (Seca_Floresta_actual_vs_simulated_VWC_control_plot.csv):


Date,A30,Plot_type,A50,A100,A200,A300,A400,A500,A600,A700,A800,A900,A1000,A1100,S30,S50,S100,S200,S300,S400,S500,S600,S700,S800,S900,S1000,S1100

5/17/1999,0.387,Control,0.301,0.329,0.339,0.370,0.378,0.415,0.422,0.433,0.418,0.414,0.410,0.406,0.388,0.301,0.329,0.339,0.370,0.378,0.415,0.423,0.433,0.418,0.414,0.410,0.406

6/8/1999,0.318,Control,0.275,0.310,0.314,0.344,0.378,0.415,0.423,0.432,0.418,0.414,0.411,0.406,0.373,0.295,0.315,0.309,0.346,0.392,0.427,0.441,0.447,0.444,0.424,0.419,0.409

8/4/1999,0.289,Control,0.243,0.288,0.298,0.332,0.366,0.405,0.416,0.426,0.411,0.407,0.397,0.397,0.289,0.255,0.291,0.291,0.314,0.360,0.404,0.416,0.430,0.433,0.420,0.422,0.416

8/24/1999,0.287,Control,0.237,0.286,0.292,0.330,0.358,0.399,0.412,0.422,0.407,0.404,0.399,0.394,0.293,0.235,0.283,0.285,0.307,0.353,0.398,0.410,0.424,0.427,0.415,0.417,0.412

9/28/1999,0.333,Control,0.267,0.280,0.273,0.297,0.347,0.383,0.402,0.413,0.398,0.395,0.371,0.387,0.378,0.284,0.271,0.277,0.297,0.343,0.390,0.400,0.416,0.419,0.407,0.409,0.405

10/27/1999,0.234,Control,0.252,0.275,0.265,0.290,0.338,0.377,0.397,0.409,0.394,0.390,0.388,0.384,0.300,0.259,0.264,0.273,0.291,0.337,0.385,0.394,0.410,0.413,0.402,0.404,0.400

11/23/1999,0.332,Control,0.258,0.273,0.245,0.269,0.315,0.355,0.372,0.390,0.376,0.372,0.369,0.366,0.342,0.254,0.257,0.269,0.287,0.333,0.381,0.389,0.406,0.408,0.398,0.400,0.396



===========================================================================================================




File 2: Seca_Floresta_actual_vs_simulated_VWC_treatment_plot.csv </b>


Data description: Volumetric water content by depth for actual measured values (prefix A) and model simulated values (prefix S) in the control plot


File organization and contents:


Column Variable Variable description

Number Name

1 Date Sample date (mm/dd/yyyy)

2 Plot_type Plot type: Control or Treatment

3 A30 Measured volumetric water content (cm^3/cm^3) at 30 centimeters

4 A50 Measured volumetric water content (cm^3/cm^3) at 50 centimeters

5 A100 Measured volumetric water content (cm^3/cm^3) at 100 centimeters

6 A200 Measured volumetric water content (cm^3/cm^3) at 200 centimeters

7 A300 Measured volumetric water content (cm^3/cm^3) at 300 centimeters

8 A400 Measured volumetric water content (cm^3/cm^3) at 400 centimeters

9 A500 Measured volumetric water content (cm^3/cm^3) at 500 centimeters

10 A600 Measured volumetric water content (cm^3/cm^3) at 600 centimeters

11 A700 Measured volumetric water content (cm^3/cm^3) at 700 centimeters

12 A800 Measured volumetric water content (cm^3/cm^3) at 800 centimeters

13 A900 Measured volumetric water content (cm^3/cm^3) at 900 centimeters

14 A1000 Measured volumetric water content (cm^3/cm^3) at 1000 centimeters

15 A1100 Measured volumetric water content (cm^3/cm^3) at 1100 centimeters

16 S30 Simulated volumetric water content (cm^3/cm^3) at 30 centimeters

17 S50 Simulated volumetric water content (cm^3/cm^3) at 50 centimeters

18 S100 Simulated volumetric water content (cm^3/cm^3) at 100 centimeters

19 S200 Simulated volumetric water content (cm^3/cm^3) at 200 centimeters

20 S300 Simulated volumetric water content (cm^3/cm^3) at 300 centimeters

21 S400 Simulated volumetric water content (cm^3/cm^3) at 400 centimeters

22 S500 Simulated volumetric water content (cm^3/cm^3) at 500 centimeters

23 S600 Simulated volumetric water content (cm^3/cm^3) at 600 centimeters

24 S700 Simulated volumetric water content (cm^3/cm^3) at 700 centimeters

25 S800 Simulated volumetric water content (cm^3/cm^3) at 800 centimeters

26 S900 Simulated volumetric water content (cm^3/cm^3) at 900 centimeters

27 S1000 Simulated volumetric water content (cm^3/cm^3) at 1000 centimeters

28 S1100 Simulated volumetric water content (cm^3/cm^3) at 1100 centimeters


Example data records (Seca_Floresta_actual_vs_simulated_VWC_treatment_plot.csv):


Date,A30,Plot_type,A50,A100,A200,A300,A400,A500,A600,A700,A800,A900,A1000,A1100,S30,S50,S100,S200,S300,S400,S500,S600,S700,S800,S900,S1000,S1100

5/17/1999,0.313,Treatment,0.311,0.301,0.307,0.325,0.354,0.374,0.394,0.399,0.373,0.386,0.392,0.413,0.313,0.311,0.300,0.307,0.325,0.354,0.374,0.394,0.399,0.373,0.386,0.392,0.413

6/8/1999,0.305,Treatment,0.289,0.263,0.300,0.304,0.341,0.370,0.394,0.396,0.366,0.384,0.404,0.415,0.351,0.310,0.316,0.307,0.331,0.361,0.392,0.389,0.397,0.390,0.383,0.391,0.391

8/4/1999,0.269,Treatment,0.245,0.268,0.285,0.294,0.325,0.358,0.384,0.397,0.372,0.362,0.394,0.402,0.289,0.269,0.292,0.291,0.311,0.350,0.391,0.394,0.405,0.401,0.387,0.386,0.382

8/24/1999,0.254,Treatment,0.251,0.248,0.271,0.297,0.326,0.354,0.382,0.397,0.356,0.372,0.393,0.396,0.293,0.241,0.284,0.285,0.304,0.345,0.387,0.392,0.404,0.401,0.388,0.387,0.382

9/28/1999,0.271,Treatment,0.258,0.247,0.266,0.269,0.295,0.339,0.367,0.386,0.348,0.361,0.381,0.390,0.378,0.284,0.271,0.277,0.295,0.337,0.382,0.386,0.401,0.399,0.387,0.387,0.382

10/27/1999,0.196,Treatment,0.208,0.231,0.270,0.264,0.326,0.301,0.346,0.367,0.309,0.315,0.348,0.396,0.295,0.268,0.265,0.273,0.290,0.331,0.378,0.382,0.398,0.396,0.385,0.386,0.381



===========================================================================================================


File 3: Seca_Floresta_simulated_VWC_control_plot.csv </b>


Data description: Simulated volumetric water content by depth from the Stella model run with rainfall and plant uptake


File organization and contents:


Column Variable Variable description

Number Name

1 Day Sequential day of the series of data

2 Date Sample date (mm/dd/yyyy)

3 Plot_type Plot type: Control or Treatment

4 S30 Simulated volumetric water content (cm^3/cm^3) at 30 centimeters

5 S50 Simulated volumetric water content (cm^3/cm^3) at 50 centimeters

6 S100 Simulated volumetric water content (cm^3/cm^3) at 100 centimeters

7 S200 Simulated volumetric water content (cm^3/cm^3) at 200 centimeters

8 S300 Simulated volumetric water content (cm^3/cm^3) at 300 centimeters

9 S400 Simulated volumetric water content (cm^3/cm^3) at 400 centimeters

10 S500 Simulated volumetric water content (cm^3/cm^3) at 500 centimeters

11 S600 Simulated volumetric water content (cm^3/cm^3) at 600 centimeters

12 S700 Simulated volumetric water content (cm^3/cm^3) at 700 centimeters

13 S800 Simulated volumetric water content (cm^3/cm^3) at 800 centimeters

14 S900 Simulated volumetric water content (cm^3/cm^3) at 900 centimeters

15 S1000 Simulated volumetric water content (cm^3/cm^3) at 1000 centimeters

16 S1100 Simulated volumetric water content (cm^3/cm^3) at 1100 centimeters



Example data records (Seca_Floresta_simulated_VWC_control_plot.csv):


Day ,Date,Plot_type,S30,S50,S100,S200,S300,S400,S500,S600,S700,S800,S900,S1000,S1100

1,5/17/1999,Control,0.3875,0.3014,0.3287,0.3393,0.3696,0.3783,0.4148,0.4225,0.4327,0.4184,0.4141,0.4103,0.4059

2,5/18/1999,Control,0.4074,0.3562,0.3347,0.3272,0.3700,0.3880,0.4155,0.4230,0.4315,0.4213,0.4128,0.4109,0.4058

3,5/19/1999,Control,0.4148,0.3611,0.3438,0.3240,0.3663,0.3928,0.4178,0.4236,0.4311,0.4233,0.4120,0.4111,0.4057

4,5/20/1999,Control,0.4076,0.3611,0.3584,0.3262,0.3641,0.3948,0.4201,0.4246,0.4312,0.4248,0.4117,0.4112,0.4056

5,5/21/1999,Control,0.4020,0.3492,0.3543,0.3282,0.3647,0.3961,0.4220,0.4259,0.4315,0.4259,0.4116,0.4113,0.4056

6,5/22/1999,Control,0.3968,0.3439,0.3496,0.3272,0.3653,0.3973,0.4236,0.4275,0.4322,0.4269,0.4117,0.4113,0.4056

7,5/23/1999,Control,0.3900,0.3353,0.3447,0.3254,0.3648,0.3983,0.4250,0.4290,0.4331,0.4278,0.4119,0.4114,0.4056

8,5/24/1999,Control,0.4168,0.3593,0.3427,0.3236,0.3636,0.3988,0.4261,0.4307,0.4342,0.4287,0.4122,0.4115,0.4056

9,5/25/1999,Control,0.4095,0.3651,0.3634,0.3275,0.3630,0.3990,0.4270,0.4322,0.4355,0.4296,0.4126,0.4116,0.4056

10,5/26/1999,Control,0.3973,0.3474,0.3567,0.3302,0.3659,0.3995,0.4276,0.4336,0.4367,0.4306,0.4130,0.4117,0.4056



===========================================================================================================


File 4: Seca_Floresta_simulated_VWC_treatment_plot.csv</b>


Data description: Simulated volumetric water content by depth in the treatment plot



File organization and contents:


Column Variable Variable description

Number Name

1 Day Sequential day of the series of data

2 Date Sample date (mm/dd/yyyy)

3 Plot_type Plot type: Control or Treatment

4 S30 Simulated volumetric water content (cm^3/cm^3) at 30 centimeters

5 S50 Simulated volumetric water content (cm^3/cm^3) at 50 centimeters

6 S100 Simulated volumetric water content (cm^3/cm^3) at 100 centimeters

7 S200 Simulated volumetric water content (cm^3/cm^3) at 200 centimeters

8 S300 Simulated volumetric water content (cm^3/cm^3) at 300 centimeters

9 S400 Simulated volumetric water content (cm^3/cm^3) at 400 centimeters

10 S500 Simulated volumetric water content (cm^3/cm^3) at 500 centimeters

11 S600 Simulated volumetric water content (cm^3/cm^3) at 600 centimeters

12 S700 Simulated volumetric water content (cm^3/cm^3) at 700 centimeters

13 S800 Simulated volumetric water content (cm^3/cm^3) at 800 centimeters

14 S900 Simulated volumetric water content (cm^3/cm^3) at 900 centimeters

15 S1000 Simulated volumetric water content (cm^3/cm^3) at 1000 centimeters

16 S1100 Simulated volumetric water content (cm^3/cm^3) at 1100 centimeters



Example data records (Seca_Floresta_simulated_VWC_treatment_plot.csv):


Day,Date,Plot_type,S30,S50,S100,S200,S300,S400,S500,S600,S700,S800,S900,S1000,S1100

1,5/17/1999,Treatment,0.313,0.311,0.300,0.307,0.325,0.354,0.374,0.394,0.399,0.373,0.386,0.392,0.413

2,5/18/1999,Treatment,0.391,0.315,0.300,0.306,0.325,0.354,0.376,0.393,0.399,0.375,0.386,0.392,0.411

3,5/19/1999,Treatment,0.407,0.335,0.302,0.305,0.325,0.353,0.378,0.392,0.398,0.376,0.386,0.392,0.409

4,5/20/1999,Treatment,0.404,0.350,0.318,0.304,0.324,0.353,0.379,0.391,0.398,0.377,0.385,0.393,0.408

5,5/21/1999,Treatment,0.399,0.340,0.325,0.304,0.324,0.353,0.381,0.390,0.398,0.378,0.385,0.393,0.406



===========================================================================================================

Data Application and Derivation:

The data are already presented as volumetric water content in cm^3 per cm^3 and no derivation is required.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Actual VWC data are derived from n=6 points at each depth within plot. Both control and treatment plot contained three soil shafts that had time domain reflectometry probes installed on two sides.

Of the nearly 2300 data points incorporated into these average values (i.e., 6 sample points for 13 depths for 29 weeks) less than 1 percent were remove due to suspect values. Problems in the field typically arise from loose cables and periodically a TDR rod will lose contact with the soil surface.

Process Description:

Data Acquisition Materials and Methods:

Volumetric water contents (cm^3 per cm^3) were measured using time domain reflectometry (TDR) sensors installed to 11-m depth in six soil shafts (two plots; three shafts per plot; yielding six sensors per depth for both plots). Each soil shaft measures 1 m by 2 m in width, and extends to a depth of 12 m. Access is obtained using a system of wooden beams and supports. TDR sensors consist of three, parallel, 24-cm stainless steel rods and were measured with a cable tester (Textronix 1502C, Beaverton, Oregon). Two TDR sensors were installed horizontally in opposing walls at 1-m increments in each soil shaft. Each of the six shafts also has two probes installed vertically from 0 to 0.3 m, and two probes installed horizontally at 0.5 m. Because the shafts were left open to maintain access for root and nutrient studies, sensors were installed into undisturbed soil 1.5 m from the shaft walls. Auger holes were back filled with native soil. This installation method was based on previous work in Oxisols in Paragominas, Para. Waveforms from the TDR sensors were collected approximately once per month. Water contents were estimated following the methods of Topp et al. [1980]. The Topp equation was validated for mineral soils in both surface and deep Oxisols in the Amazon in similar Belterra clay soil as studied here.

References:

None cited.

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