A dendrometry study was conducted at the logged forest tower site, km 83 site, Tapajos National Forest, Para, Brazil over a period of 4 years following the implementation of a reduced impact logging management regime. Dendrometer bands were installed to measure diameter growth increments for 234 trees in an 18 ha plot adjacent to the eddy flux tower at the km 83 site. In addition to trees randomly selected for measurements within the plot prior to logging, a set of smaller diameter trees within or adjacent to gaps created during the logging treatment were added to the study in 2002. Selective logging is a major land use in the Amazon Basin. An accurate accounting of the effect of logging on regional carbon balances requires better information on the rates at which the logged forest recovers biomass. There is one comma-delimited data file with this data set.
Figure 1. Dendrometer bands on trees at the km 83 study site.
Figure 2. The 18 ha intensive study plot at the km 83 site. Trees equipped with dendrometer bands before logging in November 2000 are shown as solid points. Gaps created by selective logging in September 2001 are shown as irregular shapes. The plot has 25 N-S transects (numbered 0 to 24) and 13 E-W transects (lettered A to M). The 65 m flux tower is indicated in block G4 (Figueira, et al., 2008).
Cite this data set as follows:
Figueira, A.M.S., S.D. Miller, C.A.D. de Sousa, M.C. Menton, A.R. Maia, H.R. da Rocha, and M.L. Goulden. 2011. LBA-ECO CD-04 Dendrometry, km 83 Tower Site, Tapajos National Forest, Brazil. 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/989
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Project: LBA (Large-Scale Biosphere-Atmosphere Experiment in the Amazon)
LBA Science Component: Carbon Dynamics
Team ID: CD-04 (Goulden / Rocha)
The investigators were Goulden, Prof. Michael L.; Menton, Mary Catherine; Miller, Dr. Scott Dennis; Rocha, Prof. Humberto Ribeiro da; Figuera, Michela; Cleilim Albert Sousa and Maia, Augusto Rodrigues . You may contact Miller, Dr. Scott Dennis (firstname.lastname@example.org ) and Goulden, Dr. Michael L. (email@example.com) .
LBA Data Set Inventory ID: CD04_Dendrometry
Selective logging is a major land use in the Amazon Basin. An accurate accounting of the effect of logging on regional carbon balances requires better information on the rates at which the logged forest recovers biomass. Some data are available at fairly coarse temporal scales on biomass responses to logging, but there remains a need for a more mechanistic understanding of the response of tropical forests to logging. In this study we installed dendrometer bands to measure diameter growth increments for 234 trees in an 18 ha plot adjacent to the eddy flux tower at km 83, Tapajos National Forest, Para, Brazil over a period of 4 years following the implementation of a reduced impact logging management regime. In addition to trees randomly selected for measurements within the plot prior to logging, a set of smaller diameter trees with or adjacent to gaps created during the logging treatment were added to the study in 2002.
Related Data Sets
Data are presented in one comma-separated ASCII file:
Missing data are assigned the value of -999.
|1||GRID_BLOCK||Block within 18 ha
sample grid east of flux tower
|4||COMMON_NAME||Species local name|
|5||TAG_NUMBER||Unique tree identification|
|6||XLOC||m||Distance along the east-west axis from the block origin, in meters|
|7||YLOC||m||Distance along the north-south axis from the block origin, in meters|
|8||DBH_2000||cm||Initial diameter (cm) at breast height (1.3 meters). For trees on transects this was measured in March 2000. For trees in the gaps this was measured in March or April of 2002|
|9||DIAM_320||cm||Diameter at breast height (1.3 m) on day 320 (day since 2000/01/01)|
|10||DIAM_xxx||cm||Diameter at breast height (1.3 m) on day xxx (day since 2000/01/01). Repeated|
|11||DIAM_1823||cm||Diameter at breast height (1.3 m) on day 1823 (day since 2000/01/01)|
|Missing values are -999|
Example data record:
B05,Meliaceae,Carapa guianensis Aubl.,andiroba,217,5,7,35.5,
B05,Sapotaceae,Manilkara huberi (Ducke)Chev.,macaranduba,214,24,0,35.7,
B19,Lecythidaceae,Eschweilera coriacea (A.DC.)Mori,matamata preto, 827,14, 13,35.8,
35.8,35.831, 35.993,36.135, 36.286,36.391,36.429,36.555,
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 83 Logged Forest Tower (Para Western (Santarem))||-54.9707||-54.9707||-3.017||-3.017||World Geodetic System, 1984 (WGS-84)|
Platform/Sensor/Parameters measured include:
The data collected as part of this data set, increments of diameter, can be used to estimate annual rates of above ground biomass productivity (Keller et al. 2001). Biometric measurements of productivity before and after logging can be compared to modeled results to refine our predictions of carbon dynamics in tropical forests under logging management.
We filtered the dendrometer data for the highest quality, most continuous data. Data from trees that died during the course of the study or were removed by logging or trees where the dendrometer itself was damaged and needed to be replaced during the study were excluded from the final data presented here.
Users may note that diameter measurements for Block: L05 / Common name: cocao / Tree_tag: 249 shows a somewhat erratic pattern of increases and decreases. These measurements were checked against the log books and verified as actual measurements and therefore were not removed from the data file.
This work was done at the Tapajos National Forest (TNF), a 6,000,000 ha conservation area of of humid tropical forest with a mean canopy height of 40 m. The study site is located 50 km south of Santarem, Para via an access road at km 83 of the Santarem-Cuiaba Highway. Mean annual precipitation of 1,911 mm has been recorded at a weather station in Belterra, Para 50 km from the study sites (INEMET 1992), with a dry season extending from August through November.
Our 18 ha study site was located adjacent to the eddy flux tower installed by the LBA-ECO Project and lay within a 3,200 ha reduced impact logging demonstration management area. The 700 ha logging area at km 83 was logged in three phases from August to December 2001, though most of the disturbance in the 18 ha study area occurred in September 2001. Reduced impact logging removed on average 2-3 trees per hectare with additional damage associated with landings and skid trails.
From the trees included in the biomass survey conducted in March 2000, (Menton et al., 2011), 390 individuals were randomly selected and fitted with dendrometer bands (Liming 1957). Dendrometers were installed on trees with diameters > 35 cm in November 2000, and on trees with diameters between 10 and 35 cm in February 2001. Additional dendrometers were installed on small trees located within or near newly created logging gaps in February 2002. At the installation of the dendrometers, diameter was assumed to be the same as was measured in the original biomass survey of March 2000. Change in tree circumference was measured at 6-week intervals from November 2000 through November 2004 using digital calipers. Change in circumference was converted to DBH (diameter at breast height) increment in centimeters and recorded.
Data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
Telephone: +1 (865) 241-3952
Figueira, A. M. e S., S. D. Miller, C. A. D. de Sousa, M. C. Menton, A. R. Maia, H. R. da Rocha, and M. L. Goulden (2008), Effects of selective logging on tropical forest tree growth, J. Geophys. Res., 113, G00B05, doi:10.1029/2007JG000577.
Keller, M, M Palace and G Hurtt. 2001. Biomass estimation in the Tapajos National Forest, Brazil- examination of sampling and allometric uncertainties. For. Ecol. Manage. 154: 371-382. doi:10.1016/S0378-1127(01)00509-6
Liming, FG 1957. Homemade dendrometers. J. Forestry 55: 575-577
Menton, M., M. Figueira, C.A.D. de Sousa, S.D. Miller, H.R. da Rocha, and M.L. Goulden. 2011. LBA-ECO CD-04 Biomass Survey, km 83 Tower Site, Tapajos National Forest, Brazil. 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/990