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Investigation:

CD-10 (Wofsy / Kirchhoff / Camargo / A. Nobre)

LBA Dataset ID:

CD10_CWD_TAPAJOS

Originator(s):

1. WOFSY, S.C.
2. RICE, A.H.
3. SALESKA, S.R.
      4. PYLE, E.H.
5. HUTYRA, L.R.

Point(s) of Contact:

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

Dataset Abstract:

This data set contains a single text file which reports properties of fallen course woody debris in an old-growth upland forest at the Western Para, Santarem - km 67 Primary Forest Tower Site. This site is in the Tapajos National Forest located in north central Brazil. Measurements extend from April 2001 through July 2001. Standing and Fallen coarse woody debris (CWD), or necromass were measured in a series of ecological plots at the km 67 eddy flux tower site in the Tapajos National Forest. The data set includes different size classes of debris measured in different plot sizes. Size classes were: 2-10cm (in 64 m2 subplots) , 10-30cm (in 1600 m2 subplots), 30cm (in 38400 m2 subplots), standing (in entire 50m by 1000m transects). 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 (http://www-as.harvard.edu/data/lbadata.html)

Beginning Date:

2001-04-15

Ending Date:

2001-07-15

Metadata Last Updated on:

2008-06-13

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-10 Coarse Woody Debris Data at km 67 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=858

Documentation/Other Supporting Documents:

LBA-ECO CD-10 Coarse Woody Debris Data at km 67 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/LBA/guides/CD10_CWD_Tapajos.html

Citation Information - Other Details:

Wofsy, S. C., A. H. Rice, S. R. Saleska, E. H. Pyle, and L. R. Hutyra. 2007. LBA-ECO CD-10 Coarse Woody Debris Data at km 67 Tower Site, Tapajos National Forest. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/858

Keywords - Theme:

Parameter Topic Term Source Sensor
BIOMASS BIOSPHERE VEGETATION FIELD INVESTIGATION HUMAN OBSERVER

Uncontrolled Theme Keyword(s):  BIOMASS, COARSE WOODY DEBRIS, KM67, TAPAJOS NATIONAL FOREST

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Pará Western (Santarém) km 67 Primary Forest Tower Site -2.85700 -2.85700 -54.95900 -54.95900

Related Publication(s):

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 14(4):S55.

Saleska, S.R., S.D. Miller, D.M. Matross, M.L. Goulden, S.C. Wofsy, H.R. da Rocha, P.B. de Camargo, P. Crill, B.C. Daube, H.C. de Freitas, L. Hutyra, M. Keller, V. Kirchhoff, M. Menton, J.W. Munger, E.H. Pyle, A.H. Rice, and H. Silva. 2003. Carbon in amazon forests: Unexpected seasonal fluxes and disturbance-induced losses. Science 302(5650):1554-1557.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The debris data are reported in one comma separated ASCII text file, km67_CWD_survey_2001.txt.



Columns include:



row.names = unique row identifier



T = transect



Tag = if the piece was tagged, it appears here. Only the largest pieces were tagged.



volume.cm3 = volume calculated from measured dimensions.



decay = estimated decay class, based on Harmon & Sexton (1996):



* Decay class 1 = solid wood, recently fallen, bark and twigs present.

* Decay class 2 = solid wood, significant weathering, branches present.

* Decay class 3 = wood not solid, may be sloughing but nail still must be pounded into tree.

* Decay class 4 = wood sloughing and/or friable, nails may be forcibly pushed into log.

* Decay class 5 = wood friable, barely holding shape; nails may be easily pushed into log.



size = plot size



biomass.keller.g = estimated biomass in Mg C/ha (dry mass) using locally measured densities, as described in Rice et al. 2004.



Missing Value Code is NA

Values are Comma Separated







Sample Data Record:







row.names,T,Tag,volume.cm3,decay,size,biomass.keller.g



1,1,NA,154.17352925,3,64,87.8789116725

2,1,NA,57.3601974166667,5,64,14.9136513283333

3,1,NA,2389.20013893333,4.5,64,621.192036122667

4,1,NA,79.5345868333333,4,64,37.3812558116667

5,1,NA,408.559067115,5,64,106.2253574499



...



1365,1,67,2614398.29430932,2,197500,1856222.78895961

1366,1,49,74952.7169684244,2,197500,53216.4290475813

1367,1,513,128266.375254132,2,197500,91069.1264304335

1368,1,109,110657.36409693,4,197500,52008.9611255569

1369,1,65,513494.012481363,3,197500,292691.587114377







Data Application and Derivation:

Top, middle and bottom diameters and total length were measured for fallen CWD with either a large tree caliper or a small electronic caliper and dimensional measurements converted to volumes using Newton\'s formula for a cylinder (Harmon and Sexton 1996). To calculate the volume of the standing CWD, the following taper function from Chambers et al. (2000) was used to calculate a top diameter from a DBH and an estimated height. Top Diameter = 1.59 * DBH(cm) * (Height(m)*100(cm/m))-.091. The calculated top diameter and DBH were averaged to obtain a middle diameter and these three values were again converted to disk areas and entered into Newton\'s formula to calculate a volume (substituting height for length). Volumes were converted to biomass with site-specific densities.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Data have been well proofed for transcription errors.

Process Description:

Data Acquisition Materials and Methods:

Individual pieces of CWD were measured in ground-based plots. All pieces about 10 cm in diameter and 1 m in length were tagged. Top, middle and bottom diameters and total length were measured for fallen CWD with either a large tree caliper or a small electronic caliper and dimensional measurements converted to volumes using Newton\'s formula for a cylinder (Harmon and Sexton 1996).



Data from plot-based measurements of CWD (Coarse woody debris) made at the KM 67 eddy-flux tower site, Tapajos National Forest, Brazil.



Data set includes different size classes of debris measured in different plot sizes. Size classes were: 2-10cm (in 64 m2 subplots) , 10-30cm (in 1600 m2 subplots), 30cm (in 38400 m2 subplots), standing (in entire 50m by 1000m transects).



More information on methods of data collection is available in Rice et al. 2004.

References:

Chambers, J. Q., N. Higuchi, J. P. Schimel, L. V. Ferreira, and J. M. Melack. 2000. Decomposition and carbon cycling of dead trees in tropical forests of the central Amazon. Oecologia 122:380-388.



Harmon, M. E. and J. Sexton. 1996. Guidelines for measurements of woody detritus in forest ecosystems. Publication no. 20. U.S. Long-term Ecological Research (LTER) Network Office, University of Washington, Seattle, Washington, USA.



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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