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Investigation:

LC-14 (Nepstad / Moutinho)

LBA Dataset ID:

LC14_REE_Leaf_Water_Potential

Originator(s):

1. Nepstad, Daniel Curtis
2. Moutinho, Paulo Roberto de Souza
3. Andrade, Sergio Viana de
4. Arce, Javier Alberto
5. Asner, Gregory Paul
6. Bamberger, Barbara
7. Belk, Elizabeth Leslie
8. Bishop, Joshua Thomas
9. Breyer, Lace Medeiros
10. Cardinot, Gina Knust
11. Carvalho Jr., Oswaldo de
12. Chermont, Larissa Steiner
13. Dias-Filho, Moacyr Bernardino
14. Diaz, Maria del Carmen Vera
15. Figueiredo, Ricardo de Oliveira
16. Guerrero, Jose Benito
17. Holbrook, Noel Michele
18. Kingerlee, Wendy
19. Klink, Carlos Augusto
20. Lefebvre, Paul A.
      21. Maklouf, Eduardo Jorge
22. Markewitz, Daniel
23. Merry, Frank David
24. Miranda, Antonio C.
25. Miranda, Heloisa S.
26. Monaco, Luciana Magalhaes
27. Morton, Douglas C.
28. Oliveira, Rafael Silva
29. Peters, Charles Merideth
30. Pinto, Flavia dos Santos
31. Quesada, Carlos Alberto Nobre
32. Ray, David G.
33. Rivero, Sergio
34. Santos, Alexandre J.B.
35. Schwalbe, Karen R.
36. Silva, Dulce Alves da
37. Solorzano, Luis Anibal Cardenas
38. Sternberg, Leonel
39. Silva, Wanderley Rocha da

Point(s) of Contact:

Nepstad, Daniel Curtis (dnepstad@whrc.org)
Moutinho, Paulo Roberto de Souza (moutinho@amazon.com.br)
Ray, David G. (dray@whrc.org)

Dataset Abstract:

This data set contains average monthly (bi-weekly during the dry season) estimates of leaf water potentials measured on 6 species (3 reps) common to both the control and treatment plots. Here we present means and associated error terms for each sampling date in the interval between 1/21/2000 and 12/15/2001. These data came from a rainfall exclusion experiment implemented in the Tapajos National Forest, Santarem, PA, Brazil. Two one hectare plots were established to monitor the effects of water stress on the forest. Following a one year intercalibration period plastic panels were installed in the understory of the treatment to exclude rainfall during the rainy season.
Original title: Pre-dawn and mid-day leaf water potentials for six commonly occurring species, rainfall exclusion experiment, Tapajos National Forest.

Beginning Date:

2000-01-21

Ending Date:

2001-12-15

Metadata Last Updated on:

2011-10-31

Data Status:

In Preparation for Archive

Access Constraints:

Public

Data Center URL:

http://daac.ornl.gov

Distribution Contact(s):

ORNL DAAC User Services (uso@daac.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):

Citation Information - Other Details:

Nepstad, D.C. and P.R. Moutinho. 2011. LBA-ECO LC-14 Rainfall Exclusion Experiment Leaf Water Potential, Tapajos National Forest: 2000-2001. Data set. Available on-line [http://daac.ornl.gov ] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

Keywords - Theme:

Parameter Topic Term Source Sensor
LEAF CHARACTERISTICS BIOSPHERE VEGETATION FIELD INVESTIGATION PRESSURE CHAMBER

Uncontrolled Theme Keyword(s):  Dry-down, Leaf water potential, Mid-day LWP, Plant water status, Pre-dawn LWP, Rainfall exclusion, Tapajos National Forest, Xylem pressure potential

Keywords - Place (with associated coordinates):

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

Related Publication(s):

Nepstad, D.C., P. Moutinho, M.B. Dias, E. Davidson, G. Cardinot, D. Markewitz, R. Figueiredo, N. Vianna, J. Chambers, D. Ray, J.B. Guerreiros, P. Lefebvre, L. Sternberg, M. Moreira, L. Barros, F.Y. Ishida, I. Tohlver, E. Belk, K. Kalif, and K. Schwalbe. 2002. The effects of partial throughfall exclusion on canopy processes, aboveground production, and biogeochemistry of an Amazon forest. Journal of Geophysical Research-Atmospheres 107(D20): .

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

<pre>

Data are provided in one comma-delimited ASCII file.



Filename: LC14_Leaf_Water_Potentials.csv



File contents and organization:



Column #,Heading,Units/format,Variable description,,,,,

1,Plot_type,,Plot type: Control or Treatment,,,,,

2,Sample_type,,Sample type: Midday or Predawn,,,,,

3,Date,mm/dd/yyyy,Sample collection date (mm/dd/yyyy),,,,,

4,Species,,Tree species,,,,,

5,Num_trees_sampled,,Number of trees of this species sampled,,,,,

6,Mean_LWP, KPa,Mean leaf water potential in k/Pa,,,,,

7,Mean_LWP_SE,,Standard error of Mean_LWP (column F),,,,,

8,Conf_interval_95pct,,95% Confidence interval,,,,,

,,,,,,,,

Missing values are represented as -9999,,,,,,,,



Example data records:

Plot_type,Sample_type,Date,Species,Num_trees_sampled,Mean_LWP,Mean_LWP_SE,Conf_interval_95pct

Control,Midday,1/21/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.717,0.1,0.196

Control,Midday,3/2/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.561,0.086,0.169

Control,Midday,4/5/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.606,0.133,0.262

Control,Midday,4/27/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.578,0.126,0.246

Control,Midday,6/8/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.422,0.049,0.097

... records intentionally omitted

Control,Predawn,9/26/2001,Protium spruceanum (Benth) Engl,3,-0.383,0.059,0.115

Control,Predawn,10/30/2001,Protium spruceanum (Benth) Engl,3,-0.572,0.02,0.039

Control,Predawn,11/28/2001,Protium spruceanum (Benth) Engl,3,-0.583,0.063,0.124

Control,Predawn,12/18/2001,Protium spruceanum (Benth) Engl,3,-0.639,0.106,0.208

Treatment,Midday,1/21/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.806,0.082,0.16

Treatment,Midday,3/2/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.622,0.086,0.169

Treatment,Midday,4/5/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.294,0.029,0.058

Treatment,Midday,4/27/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.681,0.132,0.258

Treatment,Midday,6/8/2000,Aparisthmium cordatum (Juss.) Baill,3,-0.378,0.036,0.071



</pre>

Data Application and Derivation:

These data are used to measure plant water stress in plants.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Not available.

Process Description:

Data Acquisition Materials and Methods:



The pre-dawn leaf water potential of mature trees was measured at approximately 2-wk intervals during the dry seasons and at longer time intervals during the wet seasons to provide a measure of canopy drought stress. Six tree species common to both forest plots were studied, with three individuals per species in each plot, and three leaves sampled per individual. Leaves were clipped before sunrise (pre-dawn sample) and at approximately noon (mid-day sample), then stored in plastic bags on ice until water potential was measured using a Scholander pressure chamber [SoilMoisture 3005-1422, Scholander et al. 1965]. Measurements were always completed within one hour of clipping. This dataset presents means, standard errors, and 95% confidence intervals by species for each sample date.

References:

Scholander PF, Hammel HT, Bradstreet ED, Hemmingsen EA (1965) Sap pressure in vascular plants. Science 148:339-346.

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