Revision Date: March 11, 2009
A field inventory of trees was conducted in March of 1997 in a logging concession at the Tapajos National
Forest, south of Santarem, Para, Brazil. The inventory was conducted by the foresters and technicians of the
Tropical Forest Foundation (FFT) and included all trees with diameter at breast height greater than or equal to
35 cm. Four blocks of approximately 100 ha each within the 3,200 ha concession were inventoried. Within each
block, parallel trails 50 m apart were established, and the location of each tree measured was recorded to the
nearest meter using an orthogonal coordinate system based on these trails. Field data for each tree includes:
identification number, ground position, diameter, common name, scientific name and qualitative estimates of bole
and canopy quality. Data are provided in one ASCII comma separated file.
These data were used to calculate above-ground live biomass as described in Keller et al. (2001), but biomass data are not included in this data set.
Cite this data set as follows:
Keller, M.M. and M.W. Palace. 2009. LBA-ECO TG-07 Ground-based Biometry Data at km 83 Site, Tapajos National Forest: 1997. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/923
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 Users who download LBA data in the five years after data have been archived must contact the investigators who collected the data, per provisions 6 and 7 in the Policy.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 April of 2009. Users who download the data between April 2009 and March 2014 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 [http://lba.inpa.gov.br/lba/] 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.
Project: LBA (Large-Scale Biosphere-Atmosphere Experiment in the Amazon)
LBA Science Component: Trace Gas and Aerosol Fluxes
Team ID: TG-07 (Keller / de Mello)
The investigators were Keller, Michael; Palace, Michael William; Pereira, Rodrigo Antonio; Hurtt, George C. and Zweede, Johan Cornelis . You may contact Palace, Michael (firstname.lastname@example.org)
LBA Data Set Inventory ID: TG07_FFT_Survey_Km83
A field inventory of trees was conducted in March of 1997 in a logging concession at the Tapajos National Forest, south of Santarem, Para, Brazil. The inventory was conducted by the foresters and technicians of the Tropical Forest Foundation (FFT) and included all trees with diameter at breast height greater than or equal to 35 cm. Four blocks of approximately 100 ha each within the 3,200 ha concession were inventoried. Within each block parallel trails 50 m apart were established and location of each tree measured was recorded to the nearest meter using an orthogonal coordinate system based on these trails. Field data for each tree includes: identification number, ground position, diameter, common name, scientific name and qualitative estimates of bole and canopy quality.
The entrance to the study site was located at -3.067 degree (S) and -54.95 degree (W) , 83 km south of Santarem, Para, on the BR-163 (Santarem-Cuiaba) Highway. A field inventory of trees in four blocks of approximately 100 ha each within the 3,200 ha logging concession at the Tapajos National Forest. This was a one time survey conducted in March 1997 by the foresters and technicians of the Tropical Forest Foundation (FFT).
The tree inventory measurements are reported in one ASCII comma separated file, TG07_FFT_Survey_Km83_20090217.csv
|Column #||Column Heading||Units||Variable Description/Comment|
|1||plot||Logging block approximately 100 ha|
|2||Tree_number||Tree ID number|
|3||X||m||Distance along x axis from 0,0 corner of plot|
|4||Y||m||Distance along y transect from plot x axis|
|5||xx||m||Distance off transect line|
|6||Real_Transect||Transect Number (every 50 m)|
|7||subtrans||Used for Monte Carlo resampling in Keller et al 2001|
|8||subplot||Used for Monte Carlo resampling in Keller et al 2001|
|12||Class||qualitative||Quality Class for Commercial Species (Classes 1-10)|
|13||Diameter||cm||Diameter at breast height (DBH)|
|14||Basal_Area||m2||Basal Area, in m2 per tree calculated from DBH|
|18||Volume||m3||Volume of bole calculated using the equation: pi divided by four times dbh squared times height times 0.7|
Commercial use: 1 indicates species currently considered commercial and 2 indicates species that are potentially commercial but have no market in the region at the current time
Example Data Records
Missing data are represented by -9999.
b18,1,43,1,43,1,1,1,Vochysia maxima,Quaruba verdadeira,Vochysiaceae,2,51,0.2,16,1,2,4.75,1,None
b18,3,20,9,20,1,1,1,Chimarrhis turbinata,Pau de remo,Rubiaceae,4,65,0.33,12,4,2,5.66,2,None
b9,5867,996,6,46,20,1,1,Swartzia panacoco,Gombeira,Leg.- Papilionoideae,1,37,0.11,17,2,2,-9999,-9999,None
b9,5868,987,2,37,20,1,1,Brosimum rubescens,Amapa amargoso,Moraceae,1,42,0.14,14,3,2,-9999,-9999,None
Site boundaries: (All latitude and longitude given in degrees and fractions)
|Site (Region)||Westernmost Longitude||Easternmost Longitude||Northernmost Latitude||Southernmost Latitude||Geodetic Datum|
|Para Western (Santarem) - km 83 Logged Forest Tower (Para Western (Santarem))||-54.9707||-54.9707||-3.017||-3.017||South-American Datum, 1969 (SAD-69)|
The data collected in this data set were used to estimate above ground biomass in this forest using four separate allometric equations as described in Keller et al. (2001). While allometric equations allow for plot scale biomass estimates made on the basis of existing forest inventories, most biomass and forestry plots are on the order of 1 ha. In contrast, these data represent 392 ha of sampling effort.
Keller et al. (2001) discuss their approach to account for both sampling errors and other potential sources of uncertainty resulting in a very conservative error estimate. While biomass data are not reported here users are referred to Keller et al. (2001) for more details. Sampling errors related to spatial variations in biomass were estimated from the variation of the four blocks sampled. Additive errors were summed directly where they were correlated and summed in quadrature when they were independent. Other sources of error were assumed to have a multiplicative effect. Positive and negative error bounds were calculated using the formula: (estimated biomass + sampling error) x (1 + other errors). The effect of sample area on biomass estimates was estimated using a Monte Carlo approach to subsample the entire data set.
The field inventory was conducted in March 1997 by the foresters and technicians of theTropical Forest Foundation (FFT). Four blocks of approximately 100 ha each within the 3,200 ha logging concession in the Tapajos National Forest were selected corresponding to the anticipated timing of future logging operations. Each block was surveyed with parallel transects at 50 m intervals using fiberglass measuring tape and staff compasses. All trees with diameter at breast height (1.3 m) were tagged with a unique number and measured. Diameters for buttressed trees were measured directly above the buttress. Relative ground position for each tree was recorded using an orthogonal coordinate system based on the survey transects.
This data is available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
Telephone: +1 (865) 241-3952
Keller, M., M. Palace, and G.Hurtt. 2001. Biomass estimation in the Tapajos National Forest, Brazil -
Examination of sampling and allometric uncertainties. Forest Ecology and Management 154(3):371-382. doi:10.1016/S0378-1127(01)00509-6