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Investigation:

LC-14 (Nepstad / Moutinho)

LBA Dataset ID:

LC14_REE_Sap_Flow_Velocity

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 document describes the extent of sap flow velocity measurements being taken on 27 individual stems representing ~20 species in the control and treatment plots. Paired constant heat probes located at DBH are being used to quantify this variable. Measurements of sapwood area for the instrumented trees are ongoing. These data come from a rainfall exclusion experiment being implemented in the Tapajos National Forest, Santarem, PA, Brazil. Two one hectare plots have been 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.
Data Quality Statement: The Data Center has determined that this data set has missing or incomplete data, metadata, or other documentation resulting in diminished usability of this product. User beware.
Known Problems: Insufficient documentation available to define the data file column headings and variable descriptions.

Beginning Date:

1999-07-01

Ending Date:

2002-02-01

Metadata Last Updated on:

2011-12-28

Data Status:

Not yet in archive queue

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):

Access data via WHRC:  ftp://terra.whrc.org/LBA_Data/Flona/SapFlowVelocityLBA_LC-14_Data.csv
Access data via ORNL DAAC:  Search at ORNL DAAC

Documentation/Other Supporting Documents:

Companion files via ORNL DAAC:  Search at ORNL DAAC
Companion files via WHRC:  ftp://terra.whrc.org/LBA_Data/Flona/SapFlowVelocityLBA_LC-14_MetaData.txt
Data Set User's Guide:  Search at ORNL DAAC

Citation Information - Other Details:

Nepstad, D.C., and Moutinho, P.R. 2011. LBA-ECO LC-14 Sap flow measurements from heated probes for stems in the control and treatment plots, rainfall exclusion experiment, Tapajos National Forest (LBA). 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
TRANSPORTATION BIOSPHERE VEGETATION FIELD INVESTIGATION  

Uncontrolled Theme Keyword(s):  Dry-down, Plant water status, Rainfall exclusion, Sap flux, Tapajos National Forest, Transpiration

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:

Data are provided in a single comma-delimited ASCII file. This file is identical to the file originally accessed from WHRC. Variable definitions for the data columns was not available.



Example data records:

Plot,Number,Scientific name,Family,Dbh (cm),Height (m),July/ 99_days,august/99_days,september/99,october/99,november/99,december/99,january/00,february/00,march/00,april/00,may/00,june/00,july/00,august/00,september/00,october/00,november,december/00,january/01,februery/01,march/01,april/01,may/01,june/01,july/01,august/01,september/01,october/01,november/01,december/01,january/02,february/02

Control,17,Couratari stellata Ac. Rich ex DC,Lecythidaceae,26.5,20,0,0,0,0,0,0,0,0,0,0,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,8,Coussarea racemosa Ac. Rich ex DC,Rubiacea,11.4,10,18,17,22,13,19,6,0,6,0,7,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,20,Coussarea racemosa Ac. Rich ex DC,Rubiacea,10.5,10,0,0,0,0,0,0,0,0,0,0,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,26,Coussarea racemosa Ac. Rich ex DC,Rubiacea,13.5,10,18,17,22,13,19,6,0,6,0,7,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,581,Erisma uncinatum Warm,Vochysiaceae,114.5,35,18,17,22,13,19,6,0,6,0,7,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,U9-9304,Eschweilera pedicellata (Richard) Mori,Lecythidaceae,,,18,17,22,13,19,6,0,6,0,7,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,107,Eschweilera pedicellata (Richard) Mori,Lecythidaceae,10.5,7,18,17,22,13,19,6,0,6,0,7,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Control,95,Forsteronia mollis Rusby,Apocynaceae,10.0,lianas not measured,0,0,0,0,0,0,0,0,0,0,0,0,13,7,5,14,19,8,0,7,0,12,11,14,16,18,17,16,19,0,24,18

Data Application and Derivation:

Not available.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Not available.

Process Description:

Data Acquisition Materials and Methods:

Sap flow velocity is being measured for 27 individuals in each plot, representing 19 species in the treatment plot, and 22 species in the control plot . We are using the constant heating method developed by Granier (1985, 1987) where probes inserted in the sapwood (heated and temperature sensitive) are used to measure the temperature differential over a known distance. Data-loggers record these measurements at 30 sec intervals which are then averaged every 30 min ( model AT, Delta �T Devices LTD, Cambridge, England). Replication of individual species within each plot is limited by the 25m long cable being used to link up to the sensors.This dataset contains measurements taken at 30-min intervals between 8:00 AM and 5:00 PM. We are in the process of determining sapwood areas for the insturmented stems. For additional information about the study site and related activities the reader is referred to Nepstad, et al. 2002.

References:

Granier, A. 1985. Un nouvelle méthode pour la mesure du flux de séve brut dans le tronc des arbres. Annales des Sciences Forestieres 42: 193-200



Granier, A. 1987. Evaluation of transpiration in a Douglas-fir stand by means of sap flow measurements. Tree Physiology 3: 309-320

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