Skip to main content

DAAC Home > Get Data > Field Campaigns > LBA (Amazon) > Data Set Documentation
LBA-ECO CD-15 LAI and Productivity Data, km 67, Tapajos National Forest: 2003-2004

Get Data
Revision date: June 14, 2013

Summary:

This data set provides mean leaf area index (LAI), dendrometry band measurements, and litterfall mass from samples collected at the km 67 research site, Tapajos National Forest, Para, Brazil. Litterfall collections were from January 23, 2004 through December 3, 2004, dendrometer measurements were monthly between December 2003 and December 2004, and LAI measurements were collected from January 26, 2004 through November 3, 2004.

All measurements were taken at the km 67 site in the Tapajos National Forest. This site is situated in an area of Amazonian primary tropical forest belonging to the municipality of Belterra, Para, Brazil. The forest is mostly evergreen with a few deciduous species. The canopy is characterized by large emergent trees up to 55-m tall, with a closed canopy at approximately 40-m; there are few indications of recent anthropogenic disturbance other than hunting trails. Measurement plots (50) were established along 4 transects at the site and within each plot, 5 subplots were established. The longest transect (25 m x 500 m) was the location of 20 (25 m x 25 m) plots. The other 3 transects (25 m x 250 m) contain 10 plots per transect. Note that the assignment of plots to transects is not provided.

There are four comma-delimited data files (.csv) with this data set.

site location


Fig. 1. Location of the study area (plots) in Tapajo´ s National Forest, Belterra, State of Para, Brazil. This is an Ikonos image showing the layout of 4 transects. The longest transect (25 m x 500 m) shows the location of 20 (25 m x 25 m) plots. The other 3 transects (25 m x 250 m) contain 10 plots per transect. Each plot has 5 subplots (not shown). From Malhado et al., 2009.

Data Citation:

Cite this data set as follows:

Costa, M.H. and W. Cohen. 2013. LBA-ECO CD-15 LAI and Productivity Data, km 67, Tapajos National Forest: 2003-2004. 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/1167

Implementation of the LBA Data and Publication Policy by Data Users:

The LBA Data and Publication Policy [http://daac.ornl.gov/LBA/lba_data_policy.html] is in effect for a period of five (5) years from the date of archiving and should be followed by data users who have obtained LBA data sets from the ORNL DAAC. Users who download LBA data in the five years after data have been archived must contact the investigators who collected the data, per provisions 6 and 7 in the Policy.

This data set was archived in June 2013. Users who download the data between June 2013 and May 2018 must comply with the LBA Data and Publication Policy.

Data users should use the investigator contact information in this document to communicate with the data provider.

Data users should use the Data Set Citation and other applicable references provided in this document to acknowledge use of the data.

Table of Contents:

1. Data Set Overview:

Project: LBA (Large-Scale Biosphere-Atmosphere Experiment in the Amazon)

Activity: LBA-ECO

LBA Science Component: Carbon Dynamics

Team ID: CD-15 (Cohen / Costa)

The investigators were Cohen, Warren B.; Costa, Marcos Heil; Ahl, Douglas Eric; Andrade, Ricardo Guimaraes; Budney, John Walter; Castleton, Dulce; Figueiredo, Daniel Nunes; Gower, Stith Tom; Kennedy, Robert E.; Maiersperger, Thomas Krueger; Portilho, Kleber da Costa; Ritts, Dave; Senna, Monica Carneiro Alves; Filho, Jose Danilo Souza and Turner, David P. You may contact Cohen, Warren B. (warren.cohen@orst.edu) and Costa, Marcos Heil (mhcosta@ufv.br).

LBA Data Set Inventory ID: CD15_Productivity

This data set provides mean leaf area index (LAI), dendrometry band measurements, and litterfall mass from samples collected at the km 67 research site, Topajos National Forest, Para, Brazil. Litterfall collections were from January 23, 2004 through December 3, 2004, dendrometer measurements were monthly between December 2003 and December 2004, and LAI measurements were collected from January 26, 2004 through November 3, 2004.

All measurements were taken at the km 67 site in the Tapajos National Forest. This site is situated in an area of Amazonian primary tropical forest belonging to the municipality of Belterra, Para, Brazil. The forest is mostly evergreen with a few deciduous species. The canopy is characterized by large emergent trees up to 55-m tall, with a closed canopy at approximately 40-m; there are few indications of recent anthropogenic disturbance other than hunting trails. Measurement plots (50) were established along 4 transects at the site and within each plot, 5 subplots were established. The longest transect (25 m x 500 m) was the location of 20 (25 m x 25 m) plots. The other 3 transects (25 m x 250 m) contain 10 plots per transect. Note that the assignment of plots to transects is not provided.

2. Data Characteristics:

Data are presented in four comma-separated ASCII files:

File 1: CD15_Litterfall_2003_2004.csv
File 2: CD15_LAI_2004.csv
File 3: CD15_Dendrometer_measurements_2003_2004.csv
File 4: CD15_dendrometry_dates.csv

File 1. CD15_Litterfall_2004.csv. Measurements were made from January 23, 2004 through December 3, 2004.

ColumnVariable Units/format Description
1Sample_date YYYYMMDD Sample Date
2Plot  Plot identification: each 25 x 25 m plot was given a unique identification number: 1-50
3Subplot  Subplot identification: each plot was divided into 5 subplots
4Mass_litterfall g Weight of dry leaves in grams (g) per litter basket: each litter basket had a surface area of 0.25 meters squared

Example data records:

Sample_date,Plot,Subplot,Mass_litterfall
20040123,1,1,6.8
20040223,1,1,5.6
...
20040426,26,2,6.8
20040524,26,2,3.7
...
20041126,50,5,7.2
20041203,50,5,8.1

File 2. CD15_LAI_2004.csv. Measurements were made from January 26, 2004 through November 3, 2004.

ColumnVariable Units/formatDescription
1Plot  Plot identification: each 25 x 25 m plot was given a unique identification number: 1-50
2Year YYYYYear of sampling
3Month MMMMonth in which measurements were made
4Day ddDay of the month on which measurements were made
5N  Number of point measurements (one per subplot) used in plot average
6LAIm2 per m2 Mean leaf area index measured with a LI-COR LAI 2000 and reported in meters squared per meter squared
7lai_sem2 per m2 Standard error of the leaf area index reported in meter squared per meter squared
8fpar  Mean fraction of absorbed photosythetic active radiation (fpar) calculated using the 'difn' output from the LAI 2000
8fpar_se  Standard error of the mean fpar value

Example data records:

Plot,Year,Month,Day,N,LAI,lai_se,fpar,fpar_se
1,2004,JAN,26,5,6.53,0.21,0.99,0
2,2004,JAN,26,5,6.27,0.14,1,0
...
50,2004,MAY,24,5,5.306,0.229,0.988,0.002
1,2004,JUN,25,5,6.448,0.199,0.994,0.002
...
49,2004,NOV,3,5,5.362,0.533,0.97,0.01
50,2004,NOV,3,5,5.526,0.415,0.986,0.003

File #3: CD15_Dendrometer_measurements_2003_2004.csv. Measurements were made from December 2003 through November 2004.

Column Variable Units/format Description
1 Plot   Plot identification: each 25 x 25 m plot was given a unique identification number
2Subplot   Subplot identification: each plot was divided into 5 subplots
3 Tree_no   Tree identification
4 Diameter cm Diameter at breast height at the beginning of the study
5Band_122003 mm Dendrometer band measurement in December 2003 reported in millimeters (mm)
6Band_012004 mm Dendrometer band measurement in January 2004 reported in millimeters (mm)
7Band_022004 mm Dendrometer band measurement in February 2004 reported in millimeters (mm)
8Band_032004 mm Dendrometer band measurement in March 2004 reported in millimeters (mm)
9Band_042004 mm Dendrometer band measurement in April 2004 reported in millimeters (mm)
10Band_052004 mm Dendrometer band measurement in May 2004 reported in millimeters (mm)
11Band_062004 mm Dendrometer band measurement in June 2004 reported in millimeters (mm)
12Band_072004 mm Dendrometer band measurement in July 2004 reported in millimeters (mm)
13Band_082004 mm Dendrometer band measurement in August 2004 reported in millimeters (mm)
14Band_102004 mm Dendrometer band measurement in October 2004 reported in millimeters (mm)
15Band_112004 mm Dendrometer band measurement in November 2004 reported in millimeters (mm) file
16Band_final mm Final dendrometer band measurement done on November 30 or December 1 or December 3 2004 reported in millimeters (mm)
17Comments   Notations from the field notebooks
missing data are represented by -9999

Example data records:

Plot,Subplot,Tree_no,Diameter ,Band_122003,Band_012004,Band_022004,Band_032004,
Band_042004,Band_052004,Band_062004,Band_072004,Band_082004,Band_102004,Band_112004,Band_final,Comments
1,1,1,80.5,-9999,37.2,-9999,-9999,
-9999,-9999,-9999,-9999,-9999,-9999,-9999,48.4,ladder
1,1,2,63.9,11.6,12.3,12.2,12.4,
12.7,12.5,12.5,10.2,12.7,12.6,12.7,13.2,-9999
...
25,2,636,-9999,-9999,-9999,-9999,-9999,
-9999,-9999,-9999,-9999,-9999,-9999,-9999,-9999,-9999
25,3,640,23.1,20.4,20.7,21.1,20.4,
21.4,21.4,21.3,21.3,21.5,21.5,22.2,20,-9999
...
50,5,783,18.6,33.5,32.2,34.2,33.3,
34.8,34.8,35.9,35.9,36.2,37,35.2,35.8,-9999
50,5,784,51.2,-9999,37,44.1,48.5,
53.7,56.8,59.2,59.3,60.4,64.9,70,78.7,-9999

File 4: CD15_dendrometry_dates.csv

This file contains the dates the dendrometry measurements reported in file 3,  CD15_Dendrometer_measurements_2003_2004.csv, were taken in each plot, for measurements one through 11, and the final measurement date (YYYYMMDD).

Example data records:

Plot,First_measurement_date,Second_measurement_date,Third_measurement_date,Fourth_measurement_date,
Fifth_measurement_date,Sixth_measurement_date,Seventh_measurement_date,Eighth_measurement_date,
Ninth_measurement_date,Tenth_measurement_date,Eleventh_measurement_date,Final_measurement_date
1,20031210,20040126,20040226,
20040323,20040427,20040525,20040626,
20040726,20040825,20041004,20041103,20041130

2,20031210,20040126,20040226,
20040323,20040427,20040525,20040626,
20040726,20040825,20041004,20041103,20041130

...
49,20031222,20040127,20040226,
20040323,20040427,20040524,20040626,
20040726,20040826,20040906,20041101,20041130

50,20031222,20040127,20040226,
20040323,20040427,20040524,20040626,
20040726,20040826,20040906,20041101,20041130

Site boundaries: (All latitude and longitude given in decimal degrees)

Site (Region) Westernmost Longitude Easternmost Longitude Northernmost Latitude Southernmost Latitude Geodetic Datum
Para Western (Santarem) - km 67 Primary Forest Tower Site (Para Western (Santarem)) -54.95900 -54.95900 -2.85700 -2.85700 World Geodetic System, 1984 (WGS-84)

Time period:

Platform/Sensor/Parameters measured include:

3. Data Application and Derivation:

These data were collected as part of the Bigfoot Project which used field data and eddy flux meaurements to validate remote sensing estimates of gross and net primary productivity across a number of biomes.

4. Quality Assessment:

Dendrometer Data:

Concerns about dendrometer data are noted in the data file (e.g. band ruptured or replaced).

Important Quaity Note:

5. Data Acquisition Materials and Methods:

Site Description:

All measurements were taken at the km 67 site in the Tapajos National Forest. This site is situated in an area of Amazonian primary tropical forest belonging to the municipality of Belterra, Para state, Brazil. The forest is mostly evergreen with a few deciduous species. The canopy is characterized by large emergent trees up to 55-m tall, with a closed canopy at approximately 40-m; there are few indications of recent anthropogenic disturbance other than hunting trails.

50 plots were established along 4 transects at the site and within each plot, 5 subplots were established. The longest transect (25 m x 500 m) was the location of 20 (25 m x 25 m) plots. The other 3 transects (25 m x 250 m) contain 10 plots per transect. Note that the assignment of plots to transects is not provided. See Figure 1.

Litterfall:

Litterfall was collected in 250 litter baskets (0.25 m2 surface area each) installed in each subplot and collected every month. The leaves were separated, dried in an oven for 24 h, and then weighed. Branches, fruits and seeds were discarded. The exact date of each collection is recorded in the data file. Samples were collected from January 23, 2004 through December 3, 2004.

LAI Measurements:

LAI measurements were made monthly from samples in the 25 x 25-m plots using three LAI-2000 Plant Canopy Analysers (Li-Cor, 1992). This technique is referred to as the indirect non-contact method and represents the projected area of leaves taking into account individual leaf inclinations (Scurlock et al., 2001). One of the instruments was installed on the top of a tower to measure the diffuse radiation on the top of the canopy, while the other two measured diffuse radiation at about 1-m high. The Plant Canopy Analyser measures diffuse radiation with a light sensor, in the 320 to 490 nm range where the radiation scattering by leaves is minimal. LI-COR software was used to determine the canopy transmittance and the LAI (m2 leaf area per m2 ground area) per subplot using an instrument specific formulation. The fraction of photosynthetically active radiation (fPAR) was estimated from the DIFN variable provided by the Li-Cor LAI-2000 Plant Canopy Analyzer (Gower et al., 1999). LAI data are included from January 26 through November 3, 2004.

Dendrometry Measurements:

Dendrometer measurments were made in 25 x 25-m plots and subplots. Woody biomass increment was determined from radial growth, measured using rust-resistant dendrometer bands (Walker and Whiteaker, 1988) to measure annual diameter growth. Dendrometer measurements were read monthly between December 2003 and November 2004. Actual dates for each reading are included in file 4, CD15_dendrometry_dates.csv.

Important Quality Note:

6. Data Access:

This data is available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).

Data Archive Center:

Contact for Data Center Access Information:
E-mail: uso@daac.ornl.gov
Telephone: +1 (865) 241-3952

7. References:

Gower, S.T., Kucharik, C.J., and J.M. Norman. 1999. Direct and indirect estimation of leaf area index, fAPAR and net primary production of terrestrial ecosystems. Remote Sensing of Environment 70:29-51.

Juarez, R.I.N., Rocha, H.R., Figueira, A.M.S., Goulden, M.L., Miller, S.D., 2009. An improved estimate of leaf area index based on the histogram analysis of hemispherical photographs. Agricultural and Forest Meteorology 149, 920-928.

Malhado, Ana C.M., Marcos H. Costa, Francisca Z. de Lima, Kleber C. Portilho, and Daniel N. Figueiredo. 2009. Seasonal leaf dynamics in an Amazonian tropical forest. Forest Ecology and Management, Volume 258, Issue 7, Pages 1161-1165, 10.1016/j.foreco.2009.06.002

Scurlock, J.M.O., Asner, G.P., Gower, S.T. 2001. Global Leaf Area Index Data from Field Measurements, 1932-2000. Available online [http://daac.ornl.gov/] from the ORNL Distributed Active Archive Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A.

Senna, M.C.A., Costa, M.H., Shimabukuro, Y.E., 2005. Fraction of photosynthetically active radiation absorbed by Amazon tropical forest: a comparison of field measurements, modeling, and remote sensing. Journal of Geophysical Research 110, G01008.

Walker, L. R., and L. D. Whiteaker. 1988. Rust prevention on dendrometer bands. Biotropica 20:336-337.