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Investigation:

CD-02 (Ehleringer / Martinelli)

LBA Dataset ID:

CD02_LEAF_WATER_POTENTIAL

Originator(s):

1. ALMEIDA, D.
2. DOMINGUES, T.F.
3. EHLERINGER, J.R.
4. MARTINELLI, L.A.
      5. COOK, C.
6. FLANAGAN, L.
7. BERRY, J.A.
8. OMETTO, J.P.H.B.

Point(s) of Contact:

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

Dataset Abstract:

This dataset includes partial leaf water potential measurements recorded quarterly over the course of one year in forest and pasture site in and near the Tapajos National Forest south of Santarem, PA.

Beginning Date:

2000-03-01

Ending Date:

2001-03-01

Metadata Last Updated on:

2012-07-18

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 CD-02 Leaf Water Potential, Forest and Pasture Sites, Para, Brazil: 2000-2001:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1100

Documentation/Other Supporting Documents:

LBA-ECO CD-02 Leaf Water Potential, Forest and Pasture Sites, Para, Brazil: 2000-2001:  http://daac.ornl.gov/LBA/guides/CD02_Leaf_Water_Potential.html

Citation Information - Other Details:

D. Almeida, T.F. Domingues, J. Ehleringer, L.A. Martinelli, C. Cook, L. Flanagan, J. Berry, and J.P. Ometto. 2012. LBA-ECO CD-02 Leaf Water Potential, Forest and Pasture Sites, Para, Brazil: 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. http://dx.doi.org/10.3334/ORNLDAAC/1100

Keywords - Theme:

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

Uncontrolled Theme Keyword(s):  LEAF WATER POTENTIAL, SANTAREM, BRAZIL

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
    -2.85700 -3.02020 -54.88850 -54.95900

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data are presented in one comma-delimited ASCII file: CD02_Leaf_Water_Potential.csv.





Data are organized as follows:





File name: CD02_Leaf_Water_Potential.csv ,,,,,,,,,,,,,





Column,Column_heading,Units/format,Variable_description,,,,,,,,,,


1,Site,,Sampling location,,,,,,,,,,


2,Date,yyyy-mm-dd,Sampling date,,,,,,,,,,


3,Time,,Sampling point: either predawn or midday,,,,,,,,,,


4,Vegetation,,Surrounding vegetation: either forest or pasture,,,,,,,,,,


5,Common_name,,Common name of the species sampled where known,,,,,,,,,,


6,Scientific_name,,Scientific name (genus species) of the species sampled where known,,,,,,,,,,


7,LWP_1,MPa,Leaf water potential in mega Pascals (MPa) measured with a Scholender's pressure chamber First of up to six replicate measurements made on the leaf sample,,,,,,,,,,


8,LWP_2,MPa,Leaf water potential in mega Pascals (MPa) measured with a Scholender's pressure chamber,,,,,,,,,,


9,LWP_3,MPa,Leaf water potential in mega Pascals (MPa) measured with a Scholender's pressure chamber,,,,,,,,,,


10,LWP_4,MPa,Leaf water potential in mega Pascals (MPa) measured with a Scholender's pressure chamber,,,,,,,,,,


11,LWP_5,MPa,Leaf water potential in mega Pascals (MPa) measured with a Scholender's pressure chamber,,,,,,,,,,


12,LWP_6,MPa,Leaf water potential in mega Pascals (MPa) measured with a Scholender's pressure chamber,,,,,,,,,,


13,Mean_LWP,,Mean leaf water potential for the individual based on an average of the measurements made,,,,,,,,,,


14,St_dev_LWP,,Standard deviation of the mean leaf water potential ,,,,,,,,,,


,,,,,,,,,,,,,


Missing data is represented by -9999,,,,,,,,,,,,,





Example data records:





Site,Date,Time,Vegetation,Common_name,Scientific_name,LWP_1,LWP_2,LWP_3,LWP_4,LWP_5,LWP_6,Mean_LWP,St_dev_LWP


STM km 67 tower,2000-03-21,Predawn,forest,Breu,Protium sp.,-0.05,-0.05,-0.05,-9999,-9999,-9999,-0.05,0


STM km 67 tower,2000-03-21,Predawn,forest,Caferana,Coussarea racemosa,-0.05,-0.05,-0.05,-9999,-9999,-9999,-0.05,0


STM km 67 tower,2000-03-21,Predawn,forest,Copaiba,Copaifera multijuga,-0.25,-0.3,-0.3,-9999,-9999,-9999,-0.28,0.03


STM km 67 tower,2000-03-21,Predawn,forest,Janita,Bauhinia guianense,-0.1,-0.15,-0.2,-9999,-9999,-9999,-0.15,0.05


STM km 67 tower,2000-03-21,Predawn,forest,Matamata,Eschweilera sp.,-0.1,-0.1,-0.1,-9999,-9999,-9999,-0.1,0


STM km 67 tower,2000-03-21,Predawn,forest,Pau-de-remo,Chimarrhis turbinata,-0.2,-0.1,-0.05,-0.1,-9999,-9999,-0.11,0.06


STM km 67 tower,2000-03-21,Predawn,forest,Tachi-Vermelho,Sclerolobium melanocarpum,-0.05,-0.05,-0.05,-9999,-9999,-9999,-0.05,0


... [records intentionally omitted]


STM km 77 tower,2001-03-02,Midday,pasture,Brachiara,Brachiara sp.,-0.15,-0.1,-0.1,-0.1,-0.1,-0.15,-0.12,0.03


STM km 77 tower,2001-03-02,Midday,pasture,Shrub 5,Not identified,-0.2,-0.2,-0.25,-9999,-9999,-9999,-0.22,0.03


STM km 77 tower,2001-03-02,Midday,pasture,Shrub 6,Not identified,-0.2,-0.2,-0.25,-9999,-9999,-9999,-0.22,0.03


STM km 77 tower,2001-03-02,Midday,pasture,Shrub 7,Not identified,-0.2,-0.25,-0.25,-9999,-9999,-9999,-0.23,0.03


STM km 77 tower,2001-03-02,Midday,pasture,Shrub 8,Not identified,-0.25,-0.25,-0.25,-9999,-9999,-9999,-0.25,0




Data Application and Derivation:

These data, in combination with leaf level gas flux measurements, can be used to better understand ecophysiological parameters related to leaf level water and carbon fluxes, and the influence of wet and dry season on gas exchange parameters.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Data have been checked and no further changes are anticipated.

Process Description:

Data Acquisition Materials and Methods:

Measurements and leaf collections occurred at both undisturbed eastern Amazonian lowland tropical rain forest and pasture ecosystems, between March 2000 and March 2001, covering both wet and dry seasons. The forest site was situated within the Tapajos National Forest reserve of the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA) located 67 km south of the city of Santarem, in the state of Para. Leaves of trees and lianas were accessed from the two 25 m walk up towers adjacent to the eddy flux tower at the site. Edaphic and biological information about these sites were presented elsewhere (Silver et al. 2000, Vieira et al. 2004). Annual precipitation averaged 2,097 mm yr-1 between 1999 and 2003 (data available at http://lba.cptec.inpe.br/beija-flor/). From July through November that region usually experiences a 5-month dry season when precipitation averages less than 100 mm month-1. Daily evapotranspiration averages 3.6 mm d-1 during the wet season and 4 mm d-1 during the dry season, while soil water content at a depth of 10 cm typically remained above 0.3 cm3 cm-3 (da Rocha et al. 2004). Air temperature above the canopy vary little throughout the year, with maximum daily temperatures ranging between 24 and 32 degrees C and minimum daily temperatures ranging between 20 and 25 degrees C (Goulden et al. 2004). The pasture site used in this study was located approximately 10 km from the primary forest site and is subject to similar regional climatic patterns. The pasture was characteristic of an old (ca. 13 years) cattle ranch farm planted with the C4 grass Brachiaria brizantha Stapf. and moderately colonized by saplings of forest species (Sakai et al. 2004).





Pre-dawn and mid-day leaf water potentials were measured with a Scholander pressure chamber (Soil Moisture 3005-1422, Goleta, CA) to assess information on vegetation water status for both primary forest and pasture ecosystems. Seven plant species within reach of the 40-m tower were measured during 4 field trips spanning from the wet season from 2000 to the wet season of 2001. At the pasture site, 5 sapling species and the grass B. brizantha were measured during the wet and dry seasons of 2001. Four to five leaves were collected from each individual and stored inside plastic bags containing wet paper towel, and then placed inside a cooler containing ice. Analyses of leaf water potential were made within two hours after cutting the plant material.

References:

da Rocha, H.R., M.L. Goulden, S.D. Miller, M.C. Menton, L.D.V.O. Pinto, H.C. de Freitas and A.M. e S. Figueira. 2004. Seasonality of water and heat fluxes over a tropical forest in eastern Amazonia. Ecol. Appl. 14:22-32. [LBA-ECO Pub ID = 446 ]




Goulden, M.L., S.D. Miller, H.R. da Rocha, M.C. Menton, H.C. de Freitas, A.M.E.S. Figueira, and C.A.D. de Sousa. 2004. Diel and seasonal patterns of tropical forest CO2 exchange. Ecological Applications 14(4):S42-55. [LBA-ECO Pub ID = 447 ]




Sakai, R.K., D.R. Fitzjarrald, O.L.L. Moraes, R.M. Staebler, O.C. Acevedo, M.J. Czikowsky, R. Da Silva, E. Brait, and V. Miranda. 2004. Land-use change effects on local energy, water, and carbon balances in an Amazonian agricultural field. Global Change Biology 10(5):895-907. [LBA-ECO Pub ID = 382 ]




Silver, W.L., J. Neff, M. McGroddy, E. Veldkamp, M. Keller, and R. Cosme. 2000. Effects of soil texture on belowground carbon and nutrient storage in a lowland Amazonian forest ecosystem. Ecosystems 3(2):193-209. [LBA-ECO Pub ID = 6 ]




Vieira, S., P.B. de Camargo, D. Selhorst, R. Da Silva, L. Hutyra, J.Q. Chambers, I.F. Brown, N. Higuchi, J. dos Santos, S.C. Wofsy, S.E. Trumbore, and L.A. Martinelli. 2004. Forest structure and carbon dynamics in Amazonian tropical rain forests. Oecologia 140(3):468-479. [LBA-ECO Pub ID = 422 ]



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