CWT-LTER Data Set Summary

Accession: 1046 CWT Research Theme: Plant Ecology
Contributors: James S. Clark,
Title: Tree census, demography, and exposed canopy area data at the Coweeta LTER Terrestrial Gradient Sites, Coweeta Hydrological Laboratory, Otto, NC from 1993 to 2016
Abstract: The five Terrestrial Gradient sites were established in the early 1990s as part of the 1990 Coweeta LTER Renewal. The original terrestrial gradient sites were 20 x 40-m. In the late 1990s the plots were expanded to 80 x 80-m and later (around 1998) they were slope-corrected by Clark's lab using survey equipment. Much of the Coweeta LTER “core” datasets have been collected from the gradient plots. This study is one of the long-term studies that are ongoing with defined sampling intervals. The tree demography and census study consists of trees census every two years and seeds collected ~5 x each year.
Key Words: canopy, canopy area, Coweeta LTER, CWT, Duke University, forest structure and function, LTER, LTER funding, plant ecology, regional characterization, Terrestrial Gradient, tree census, tree demography, tree diameter, tree growth
LTER Core Area: Primary Production
CWT Themes: Plant Ecology, Population Ecology
Study Type: Coweeta Terrestrial Gradient Project
Study Period: 01-Jan-1993 to 31-Dec-2016
Site References:
WS18 -- Watershed 18, North Carolina, USA
WS27 -- Watershed 27, North Carolina, USA
CWTBASIN -- Coweeta Basin, Macon County, North Carolina, USA
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Downloads: 

Data Table: 1046_Diameter (Diameter Data table for dataset 1046, 37172)

Access: Public (released 24-Jun-2015)

Metadata: Text (ESA FLED), Basic EML, Complete EML

Data Formats: Spreadsheet CSV Text Format, EML-described Text Format, Tab-delimited Text Report with Statistical Summary, GCE Data Toolbox Format, Standard MATLAB Variables Format

Column List:

Column Name Units Type Description (hide)
1 SpecimenID none integer unique and invariant identifier
2 MeasurementYear yyyy integer year of measurement
3 Diameter cm floating-point diameter measurement taken at height of tree tag

Data Table: 1046_Qual_16 (Qualitative Data table for dataset 1046, 56379)

Access: Public (released 24-Jun-2015)

Metadata: Text (ESA FLED), Basic EML, Complete EML

Data Formats: Spreadsheet CSV Text Format, EML-described Text Format, Tab-delimited Text Report with Statistical Summary, GCE Data Toolbox Format, Standard MATLAB Variables Format

Column List:

Column Name Units Type Description (hide)
1 SpecimenID none integer Specimen ID; Every tree has a unique and invariant identifier, the 'order number' in the data set. The tag it bears in the field is not unique and can change, i.e., when lost and replaced. New order numbers are added sequentially and never reused.
2 Species none alphanumeric string Latin name of species
3 CommonName none alphanumeric string Common name of species
4 PlotID none integer Plot ID; Gradient plots (5 sites; 118, 218, 318, 427, 527)
5 OrderNo none integer Unique and invariant identifier for each tree
6 BlockID none alphanumeric string Each plot is 80 x 80 m and is divided into sixteen 20 x 20 m blocks labeled A - P
7 UTMX m floating-point UTM x coordinate; Each x and y coordinate has been rubber-sheeted in GIS to come up with a UTM (NAD 83) for each tree
8 UTMY m floating-point UTM y coordinate; Each x and y coordinate has been rubber-sheeted in GIS to come up with a UTM (NAD 83) for each tree
9 CodeYear YYYY integer Year
10 CodeType none alphanumeric string Growth refers to tree growth. Sex refers to the sex of the tree. Canopy refers to whether the canopy was suppressed, intermediate, or codominant.
11 Code none alphanumeric string Code indicating the sex, canopy, or growth findings for that particular year

Data Table: Exposed_Canopy_Area (Exposed canopy area data for dataset 1046, 465)

Access: Public (released 24-Jun-2015)

Metadata: Text (ESA FLED), Basic EML, Complete EML

Data Formats: Spreadsheet CSV Text Format, EML-described Text Format, Tab-delimited Text Report with Statistical Summary, GCE Data Toolbox Format, Standard MATLAB Variables Format

Column List:

Column Name Units Type Description (hide)
1 SpecimenID none integer unique and invariant identifier
2 MeasurementYear yyyy integer year of measurement
3 Exposed_Canopy_Area m floating-point area of tree canopy not overtopped by any other tree