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This data set contains a single comma separated text file which reports diameter at breast height (DBH) measurements in the old-growth upland forest at the Pará Western (Santarém) - km 67, Primary Forest Tower Site. This site is in the Tapajos National Forest located in north central Brazil. Measurements were made periodically from July 1999 through August 2005.

Trees with DBH >35cm were measured for ~2600 trees in four 5ha transects. Trees >10cm were measured in a smaller area (Rice et al., 2004). Measurements were made in 1999, 2001, and 2005. Trees are identified by local common names. A cross reference to scientific names is provided as a companion file.

Coarse woody debris and litter samples and measurements were collected same area. See related data sets.

Picture of Transects  

Figure 1.In July of 1999, trees were surveyed in 20 ha of forest in the tower "footprint." Over 2500 trees were measured, identified and mapped in four transects (1000m) east of the tower. Tree DBH was measured at 1.3 meters unless a buttress was present, in which case the DBH was measured just above the buttress.

Data Citation:

Cite this data set as follows:

Wofsy, S. C., S. R. Saleska, E. H. Pyleand L. R. Hutyra. 2008. LBA-ECO CD-10 Tree DBH Measurements at the km 67 Tower Site, Tapajos National Forest.Data set. Available on-line [] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/859

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

The LBA Data and Publication Policy [] 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 Users who download LBA data in the five years after data have been archived must contact the investigators who collected the data, per provisions 6 and 7 in the Policy.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 May of 2008. Users who download the data between May 2008 and April 2013 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. Alternatively, the LBA Web Site [] in Brazil will have current contact information.

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-10 (Wofsy / Kirchhoff / Camargo)

The investigators were Saleska, Scott, R.; Hutyra, Lucy ; Pyle, Elizabeth Hammond and Wofsy, Steven C. . You may contact Hutyra, Lucy ( and Pyle, Elizabeth Hammond (ehp@io.harvard)

LBA Data Set Inventory ID:CD10_DBH_Tapajos

Repeated DBH (diameter at breast height) measurements of live trees in 4 transects in the foot print of an eddy flux tower.

These data may be updated or reprocessed from time to time, and it is the user's responsibility to insure that you have the most recent version of the data. For the latest version, please see the following web site: Harvard University, LBA Web Page (

Related Data Sets:

LBA-ECO CD-10 Ground-based Biometry Data at km 67 Tower Site, Tapajos National Forest

LBA-ECO CD-10 Forest Litter Data for km 67 Tower Site, Tapajos National Forest

LBA-ECO CD-10 Coarse Woody Debris Data at km 67 Tower Site, Tapajos National Forest

2. Data Characteristics:

A single comma-delimited ASCII text file contains the following information for each individual tree:

Column = description

trans = transect 1, 2, 3, or 4

tag = Initial tag number. Stays the same unless tag falls off, disappears, or is out grown.

new_tag = If tree loses tag, and gets retagged, then new tag number appears in this column. Otherwise appears as an NA.

volume.cm3 = volume calculated from measured dimensions.

common_name = name assigned by matieros, in Portuguese

x = distance along the x-axis. This is the long, 1000m axis.

y = distance on y axis, or centerline, positive is towards the north, negative towards the south for Ts 1-3; for T4, positive is to the west and negative to the east.

band = a logical flag, where 1 indicates tree also had dendrometer.

dbh_99 = dbh measurements in 1999, in cm, note an NA is entered for trees that are recruited later.

dbh_01 = dbh measurements in 2001, in cm, NA could also be tree that died.

dbh_05 = dbh measurements in 2005, in cm, NA could also be tree that died.

canopy_05 = an indicator of canopy status in 2005 survey, where 1=emergent, 2= canopy, 3=subcanopy, 4= understory/suppressed.

dead_05 = logical flag, where 1 = trees that were previously alive, but dead in 2005.

dead_01 = logical flag, where 1 = trees that were previously alive, but dead in 2001.

yr_rec = logical column for what year tree was recruited.

wood_dens = wood density assigned from Chave et al. (2006) supplement compilation of wood densities.

Sample Data Record:

The DBH data are reported in one comma separated ASCII text file, km_67_tree_surveys_99_05.csv


1,1,NA,freijo branco,Cordia bicolor,Boraginaceae,25,11,0,43.3,42.6,42.7,1,0,0,0,0.48
1,2,NA,louro amarelo,Aniba,Lauraceae,26,18,0,42.3,42.5,42.8,1,0,0,0,0.59
1,3,NA,fava mapuxiqui,Balisia pedicelares,Leguminosae-Mimosoideae,54,18,0,54,56.6,60.1,1,0,0,0,0.52
1,4,NA,mandioqueira rosa,Qualea dinizii,Vochysiaceae,65,19,1,43.8,45.1,NA,NA,1,0,0,0.62
1,5,NA,mandioqueira ariana,Qualea,Vochysiaceae,73,14,0,42.3,42.2,44,1,0,0,0,0.62

4,9116,116,tachi vermelho,NA,NA,99,3,0,NA,NA,11.5,2,0,0,0,0.57
4,9116,116,tachi vermelho,NA,NA,99,3,0,NA,NA,11.5,2,0,0,0,0.57
4,9117,117,envira preta,NA,NA,232,3,0,NA,NA,16.4,3,0,0,0,0.5675
4,9117,117,envira preta,NA,NA,232,3,0,NA,NA,16.4,3,0,0,2005,0.5675
4,NA,195,tachi vermelho,NA,NA,371,4.5,NA,NA,NA,12.6,3,0,0,2005,0.57

Missing Value Code is "NA". "NA" may also have meaning as indicated in column description. Values are Comma Separated

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

Site (Region)Westernmost LongitudeEasternmost LongitudeNorthernmost LatitudeSouthernmost LatitudeGeodetic Datum
Para Western (Santarem)- km 67 Primary Forest Tower Site (Para Western(Santarem))-54.959 -54.959 -2.857 -2.857 World Geodetic System, 1984(WGS-84)

Time period:

Platform/Sensor/Parameters measured include:

Companion Documents:

Included as a companion document is the report by GUIMARÃES and PYLE (1999, in Portuguese) that contains summaries of initial results including species list, summaries of frequency and basal area by transect, lists of common families and species encountered during the census. Census_report_Guimaraes_Pyle_1999.pdf

Included as companion files are files of the common names as reported in the DBH data file cross referenced with scientific names.

Sorted by Scientific Name: DBH_names_species_sort.csv

Nome cientifico,nome vulgar
Abarema jupunba,"fava saboeira, fava"
Abarema mataybifolia,"tento folha miuda, tento preto"
Alexa grandiflora,melanciera
... Vochysia surinamensis,Quaruba rosa
Xylopia nitida,envira cana
Xylopia nitida,envira cana
Xylopia ochrantha,envira vermelho

Sorted by Common Name: DBH_names_common_sort.csv

Nome cientifico,nome vulgar
Diploon venezuelano,Abiu
Pouteria caimito,Abiu
Lindackeria latifolia,Urucurana
Endopleura uchi,uxi liso
Chanouchiton kapleri,Xixuá

Adapted from: GUIMARÃES, Edna G. Tenório and PYLE, Elizabeth Hammond. August 1999. LEVANTAMENTO FLORESTAL DE 20 HA NA FLORESTA NACIONAL DO TAPAJÓS, Experimento de Grande Escala da Biosfera-Atmosfera na Amazônia. (In Portuguese)

(Ecological Research in the Large Scale Biosphere-Atmosphere Experiment in Amazônia.)

3. Data Application and Derivation:

Used to estimate total standing live biomass in forest, as well as fluxes in live biomass and compare to eddy-flux tower observations.

4. Quality Assessment:

Data have been proofed and corrected where necessary. Problems with these types of measurements can include instances where trees appear to grow or shrink an impossible amount; a difference likely due to transcription error in the field. This data set has been screened for such errors and they have been filled with mean values of similar trees. Contact author for more information on corrections.

5. Data Acquisition Materials and Methods:

Working with Brazilian forester, Edna Gomes Tenório Guimarães, we installed four permanent transects, 50m by 1000m, adjacent to the eddy-covariance tower site. Three radial transects originate at the tower and run 1000m in the three predominant wind directions, northeast, east, and southeast. The fourth runs north-south, situated in the main footprint of the tower, intersecting the east-west transect about 300 m upwind. To permanently mark the area, stakes (PVC pipe) were installed every 50m to mark distance along the central transect line.

All live trees were measured in 4 x 50m by 1000m transects in the footprint of an eddy-flux tower. All trees with diameter at breast height (DBH) greater than 35cm were measured, tagged, and mapped on an X-Y coordinate system. Tree DBH was measured at 1.3 meters unless a buttress was present, in which case the DBH was measured just above the buttress. Small trees with DBH greater than 10cm were sub-sampled in a 10 x 1000m transect along the center line of the larger transect.

Smaller trees (between 10 and 35 cm DBH) were also identified, tagged and measured in a narrower swath, 5 m on either side of the central transect line. We used the smaller survey area for small trees due to the large number of stems in that size class. Estimates of x-y coordinates for each tree stem were recorded in terms of the distances along (x) and perpendicular to (y) each transect line. Mateiros from EMBRAPA, Erly Pedroso, and Nilson de Souza Carvalho identified trees by common name. Two student interns, Jorge José Pinheiro Macêdo, and Ocidne Franck A. Magalhães, were trained in basic forest mensuration techniques and data assembly and provided field assistance. In a subsequent visit in the fall of 1999, Nelson Rosa of the Museo Gueldi, Belèm collected specimens and provided botanical identifications.

Sensors used include:

6. Data Access:

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

Data Archive Center:

Contact for Data Center Access Information:


 Telephone: +1 (865) 241-3952

7. References:

Jérôme Chave, Helene C. Muller-Landau, Timothy R. Baker, Tomás A. Easdale, Hans ter Steege, and Campbell O. Webb. 2006. REGIONAL AND PHYLOGENETIC VARIATION OF WOOD DENSITY ACROSS 2456 NEOTROPICAL TREE SPECIES. Ecological Applications 16(6):2356–2367.

GUIMARÃES, Edna G. Tenório and PYLE, Elizabeth Hammond. August 1999. LEVANTAMENTO FLORESTAL DE 20 HA NA FLORESTA NACIONAL DO TAPAJÓS, Experimento de Grande Escala da Biosfera-Atmosfera na Amazônia. (In Portuguese)

Rice, A.H., E.H. Pyle, S.R. Saleska, L. Hutyra, M. Palace, M. Keller, P.B. de Camargo, K. Portilho, D.F. Marques, and S.C. WOFSY. 2004. Carbon balance and vegetation dynamics in an old-growth Amazonian forest. Ecological Applications, Vol. 14, No. 4, pp. S55.

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