ON-LINE VERSION
A DATA SET is a series of observations collected by the same methodology. Each data set should have documentation sufficient for someone unfamiliar with the research to replicate the study. Data sets may be broken into subsets (data files) that are discrete in space and time, in that order. The documentation for a data set should include all spatial and temporal subdivisions of the data.
(Data, Abstract, Methods, Variables)
NOTES:
PERSON(S) COMPLETING THIS FORM: E-MAIL ADDRESS:
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Randall W. Myster |
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Eda C. Melendez-Colom |
PROJECT TITLE: Land Use (LTER
permanent plot vegetation sampling)
PROJECT DESCRIPTION: Permanent plot data is expected to show (1) rapid increases
in percent cover and tree stem density, and (2) rapid turnover from early to
late successional plant species. Plant-plant competition indices should show
quick increases in intensity with exotics as top competitors which may lead
to exclusion of some trees common after landslide and pasture disturbance. Spatial
patterns of invading trees should include edge effects due to dispersal limitation
with clumping of bird-dispersed species before the first five years. Because
of increased nitrogen levels due to plantings of Inga Sp. with coffee, trees
should grow, as measured by biomass (productivity), height and basal diameter
increases, significantly faster compared to landslide.
Natural pasture that had cows and
horses grazing until early 1996. No planted grasses, although some grasses seeded
naturally because of the effect of the couse and horses. Those grasses are in
the percent cover data set.
LTER CORE AREAS: (Annotate all that apply)
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Disturbance Patterns |
LEF LTER 1 RESEARCH TOPIC: (Annotate all that apply)
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Disturbance Regime |
We define a data file as
a component of a data set. A data set can have only one data file or more. Basically,
different data files have different data structures or format.
DATA SET FILES (SUBSETS):
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Data File No. |
Data File Identifier |
On-Line Filename |
Starting Date |
Periodicity of sample |
End Period |
| 1 | Sabana Percent cover percent | SabanaPastcover.txt | Nov. 16, 1995 | yearly | ongoing |
| 2 | Sabana Tree stem | SabanaTreeStem.txt | Nov. 16, 1995 | yearly | ongoing |
| 3 | Las Davilas cover percent | LasDavilas.txt | Aug. 31, 2000 | yearly | ongoing |
| 4 | Puente Roto cover percent | PteRoto.txt | Nov. 10, 2000 | yearly | ongoing |
| 5 | Road 990 cover percent | ROAD990.txt | Sep. 14, 2000 | yearly | ongoing |
| 6 | Road 9948 cover percent | ROAD9948.txt | Nov. 29, 2000 | yearly | ongoing |
RESEARCH LOCATION: Sabana, Las Dávilas, Puente Roto (Pte. Roto), San Vicente (Road 990), and Road 9948 pastures.
INVESTIGATORS:
PRINCIPAL INVESTIGATORS E-MAIL address
|
Randall W. Myster |
OTHER RESEARCHERS E-MAIL address
CONTACT PERSONS E-MAIL address Phone Number (Include area code)
|
Randall W. Myster |
SOURCE OF FUNDING (SPONSOR): NSF
DATA SET ABSTRACT: Permanent plot data is expected to show these temporal patterns: (1) rapid increases in percent cover and tree stem density, and (2) rapid turnover from early to late successional plant species. Plant-plant competition should show quick increases in intensity with native grass species and exotic as top competitors. These may lead to exclusion of some trees common after landslide disturbance. Spatial patterns of invading trees should include edge effects due to dispersal limitation with clumping of bird-dispersed species before the first five years after cow exclusion. Because of intact soil and low vegetation in the pasture trees should grow, as measured by biomass(productivity), height, and basal diameter increases, significantly faster compared to colonization of landslides.
DATA SET METHODS: Twenty five (2 m X 5 m) plots have been set in the pasture next to the forest. These are organized in five rows with five plots each set up with the 5 m side along the forest edge. The percentage of the area of each plot covered by each species is visually estimated (file 1). For each tree stem in each plot greater than 1 m in height, we measure the basal diameter and height, and identify the species.
REFERENCES:
Same plot size as in:
SAMPLE LOCATION: N/A
STORAGE SITES: ITES, Data Mngr.'s File Cabinet DM-001 Drawer #2
INVESTIGATOR'S ASSIGNED KEYWORDS: long-term, permanent plots, tree invasion, establishments, percent cover
LEF LTER OFFICIAL KEYWORDS (See table): EL VERDE, SABANA, OTHER PLOT, COFFEE, PASTURES, HUMAN, HERBS, SHRUBS, TREES, PEER REVIEWED JOURNAL
PUBLICATIONS:
Myster, R. W. 2003. Vegetation dynamics of a permanent pasture plot in Puerto Rico. Biotropica 35: 422–428.
DISSEMINATION: UNRESTRICTED
REASONS TO RESTRICT DATA IN THIS DATA SET BEYOND ITS TWO YEAR POLICY PERIOD*:
*WILL HAVE TO BE APPROVED BY LTER PRINCIPAL INVESTIGATORS: J. ZIMMERMAN, A. LUGO , D.J. LODGE
FILING
___ "File" copy only : Data Management will only file an electronic copy
of the data file and its documentation
X "Enter" data on-line : Data Management will be in charge of
entering the data on computer files (Contact Eda C. Meléndez
SITES DESCRIPTIONS:
- Sabana pasture located in the town of Sabana close to Forest Service
Station.
- Las Dávilas pasture (13 years old pasture)
- Highway 990 , San Vicente pasure (5 years old pasture)
- Highway 9948 pasture (18 years old pasture) , SW corner of the LEF
- Puente Roto, Mameyes pasture (23 years old pasture)
Geographical positional system (GPS) Coordinates for each location:
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location |
latitude |
longitude |
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FILE NAME OR #ABOVE (all in which the variable appears) |
1-6 | 1-6 | 1-6 | 1, 2-6 |
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ABBREVIATION (as it appears on the data file) |
Date | Plot# | Species | Cover% |
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NAME OF VARIABLE |
Sampling date | Plot Number | Species code | Percent cover |
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DEFINITION OF VARIABLE |
Date in which the sampling took place | Name assigned to the plot on which the observation is done | A six letter code "Gggsss", where the first three are the first 3 letters of the genus, and the last three are the 3 first letters of the species (all in upper case) | Percent of total area of the 5m X 2m plot covered by the species. Because of stratification it could exceed 100%. |
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UNIT |
An integer {1, ..., 25} that designates plot# within a 25m X 10m area located along the forest edge at the northeast edge of the LEF. Each plot measures 5m X 2m. The 5m sides of the plots are located along the forest edge. The row closest to the forest edge is row 1 and the first column located to the northeast side is column a: See illustration | N/A | percentage | |
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PRECISION |
N/A | within 1 - 2 % | ||
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RANGE OR LIST OF VALUES |
(1-25) | 1 - >100 | ||
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DATA TYPE |
(mm/dd/yyyy) | integer |
alphabetic (Aaaaaa) |
integer |
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MISSING DATA CODES |
none | none |
none |
none |
VARIABLES:
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FILE NAME OR #ABOVE (all in which the variable appears) |
2 | 2 | 2 |
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ABBREVIATION (as it appears on the data file) |
Tag# | Height | Basal Dia. |
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NAME OF VARIABLE |
Plant Tag Number | Height | Basal diameter |
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DEFINITION OF VARIABLE |
numerical stem identifier | height of tree stems > 50 cm | diameter of the stem in cm at ground level |
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UNIT |
integer | centimeters | centimeters |
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PRECISION |
N/A | .1 cm | .01cm |
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RANGE OR LIST OF VALUES |
{1,...} | {x| x > 50, x in Integers} | >0 |
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DATA TYPE |
integer |
real |
real |
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MISSING DATA CODES |
none |
none |
none |
(NE)
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COMPUTATIONAL METHODS:
| Variable Name | Formula |
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none |
FOR DATA MANAGER USE ONLY
DATE OF LAST REVIEW:
February 9, 2007
DATE OF LAST ENTRY: 2001
STAGE OF DATA SET MANAGEMENT (dates):
RECEIVED: February 27, 1997
ENTERED: FILED Feb 1997
ON-LINE Feb 28 2001
REVIEWED BY RESEARCHER: September 16, 1998
FILING MEDIA: paper copy and magnetic media
NAME OF DOCUMENTATION FILE: lterdb97.fm*
NAME OF DATA FILE:
1) Percent cover file (pastcov.db - paradox file), and
2) Tree stem file (paststem.db - paradox file)
NAME OF ON - LINE CATALOG :LTERDBAS
RECORD #: 97
DOCUMENT TYPE: paper copy and magnetic media
PRIORITY TO BE ENTERED: second
Rev. date of this form: 18 March 2002