LUQ LTER DATA SETS DOCUMENTATION FORM

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.

NOTES:

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DATA SET IDENTIFIER: Canopy Trimming Experiment (CTE) trace gases

PROJECT DESCRIPTION: This long-term experiment will increase the frequency of simulated hurricane effects above background levels to once every six years. The experiment will determine effects of repeated disturbance of the forest canopy and increased detrital inputs to the forest floor on germination, growth, survival, nutrient cycling, soil conditions, and trophic structure. Climate change models predict increased frequency and intensity of Caribbean hurricanes (Emmanuel 1987, Goldenberg et al. 2001), and our goal is to evaluate predictions regarding the effects of an increased rate of hurricane disturbance on tabonuco forest (Sanford et al. 1991). The experiment also is designed to decouple the effects of canopy disturbance (e.g. , light levels, temperature, moisture, etc. ) from those of increased detrital inputs on rates of detrital processing and resultant community and ecosystem processes. Manipulations and measurements of detrital processing, SOM, and soil properties associated with SOM will continue for at least three more funding periods (until 2024). In the short-term, we will use faunal manipulations nested within the canopy trimming experiment to measure the strength of interactions between autotrophic and detrital food webs in the context of hurricane-like disturbance. These results will be directed specifically at parameterizing the Trophic Interaction Model. This experiment also will provide a physical and intellectual focal point for the project participants. The Canopy Trimming Experiment has two parts: 1) a forest canopy manipulation with measurements of coupled changes in microclimate, structure, and biota and their associated impacts on ecosystem processes, and 2) specific manipulations of the biota that assess the importance of components of the food web.

CTE trace gases: This research explores the trace gas dynamics from the Canopy Trimming Experiment

LTER CORE AREAS: (Annotate all that apply) (See online list)

inorganic nutrients

disturbance

LEF LTER 1 RESEARCH TOPIC: Annotate all that apply (See online list)

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):
NOTE: The decomposition data for this data set will be published soon - May 8, 2009

Data File No.	Data File Identifier	On-Line Filename	Starting Date	Periodicity of sample	End Period
1	CTE Trace gases	2004-2007fluxesCTEPlots.txt*	January 30, 2004	monthly	January 25, 2007

NOTE: To obtain a copy of this data file, please contact Whendee Silver (wsilver@nature.berkeley.edu).

RESEARCH LOCATION: Block A: 30+ m West of western edge of Big Grid, on North and South side of Prieta stream, near Vogt old plots. Block B: 30+ m South of Big Grid, all plots along Oxcart Trail. Block C: 30+ m West of SE corner of Big Grid.

INVESTIGATORS:

SOURCE OF FUNDING (SPONSOR): NSF LTER

DATA SET ABSTRACT: This data set provides the monthly trace effluxes measured across the soil-atmosphere interface from five soil surface chambers in all the CTE plots.

DATA SET METHODS: We measured trace effluxes across the soil-atmosphere interface from five soil surface chambers monthly in all the CTE plots. Gas samples were sampled over 5 time points, injected immediately into pre-evacuated vials sealed with geo-microbial septa. Samples were shipped overnight to UC Berkeley where they were analyzed on a gas chromatograph. Carbon dioxide was analyzed using a TCD, N2O with a ECD and methane with an FID.

Table 1. Treatments by block and plot number, subplot locations of litter baskets, and dates of canopy trimming applied to appropriate plots (NA is not applicable – trimming not applied).

REFERENCES:

CROSS-REFERENCES (other data sets related to this one):

SAMPLE LOCATION:

STORAGE SITES(of data files): electronic copies in LTER Data Manager’s office, Originals and electronic copies at University of California Berkley

INVESTIGATOR'S ASSIGNED KEYWORDS: trace gases, carbon dioxide, nitrous oxide, methane

LEF LTER OFFICIAL KEYWORDS (See table): CTE blocks, SUBTROPICAL WET, CARBON, DISTURBANCE, DECOMPOSITION, HURRICANE

PUBLICATIONS:

DISSEMINATION:

RESTRICTED  X                                          UNRESTRICTED

REASONS TO RESTRICT DATA IN THIS DATA SET BEYOND ITS TWO YEAR POLICY PERIOD*: I would prefer that access to these data be restricted until we can submit the paper (then the dataset will be released). Publishing a portion of the dataset prior to obtaining the long term trend will compromise our ability to publish the whole dataset (which is defined as the end of the treatment effect). We expect that the end of the treatment effect occurred in mid 2008 and are currently working to verify this, and submit the paper. - approved by Nick Brokaw

SITES DESCRIPTIONS: CTE experimental blocks are located in El Verde (18"19'N, 65'49'W), the site of a 70-ha research forest that is 350-500m a.s.1. and receives a mean annual precipitation of 3460 mm; mean monthly temperatures range between 21 and 25 oC (Brown et al. 1983).  The vegetation is classified as subtropical wet forest (Ewe1 & Whitmore 1973) and lies in the tabonuco zone which is dominated by Dacryodes excelsa Vahl. (tabonuco) and Prestoea montana (R. Grah.) Nichols (sierra palm).

Geographical positional system (GPS) Coordinates for each location:

Location	Latitute	Longitute
EL VERDE RESEARCH AREA, LEF, MUN. RIO GRANDE	18.3	-65.8

The following table displays the x and y coordinates in Puerto Rico Planar Coordinates:

VARIABLES (ATTRIBUTES):

File Name or # above (all in which the variable appears)	1	1	1	1
AbbreviationAbbreviation(as it appears on the data file)	Date	Block-plot-rep	Month	Year
NAME OF VARIABLE	Date of sampling injection	Block-Plot-Replica string	Month of sampling injection	Year of sampling injection
DEFINITION OF VARIABLE	Date when gas samples were sampled over 5 time points and injected immediately into pre-evacuated vials sealed with geo-microbial sept.	Name to one of a cluster of 5 similar plots in one of three 30m X 30m treatment plot within a Block, serving as replicates where {A = West of western edge of Big Grid plot, B = South of Big Grid, C =  West of SE}-{1,. . . , 4}-{1, ..., 5}. No data are missing in the data file.	Corresponding month of date when gas samples were sampled over 5 time points and injected immediately into pre-evacuated vials sealed with geo-microbial sept.	Corresponding year of date when gas samples were sampled over 5 time points and injected immediately into pre-evacuated vials sealed with geo-microbial sept.
UNIT
PRECISION
RANGE OR LIST OF VALUES		A-1-1 = Block A-Plot 1-Replica 1 in one of the 16 SubPlots, A-1-2 = Block A-Plot 1-Replica 2 in one of the 16 SubPlots, A-1-3 = Block A-Plot 1-Replica 3 in one of the 16 SubPlots, A-1-4 = Block A-Plot 1-Replica 4 in one of the 16 SubPlots, A-1-5 = Block A-Plot 1-Replica 5 in one of the 16 SubPlots, A-2-1 = Block A-Plot 2-Replica 1 in one of the 16 SubPlots, A-2-2 = Block A-Plot 2-Replica 2 in one of the 16 SubPlots, A-2-3 = Block A-Plot 2-Replica 3 in one of the 16 SubPlots, A-2-4 = Block A-Plot 2-Replica 4 in one of the 16 SubPlots, A-2-5 = Block A-Plot 2-Replica 5 in one of the 16 SubPlots, A-3-1 = Block A-Plot 3-Replica 1 in one of the 16 SubPlots, A-3-2 = Block A-Plot 3-Replica 2 in one of the 16 SubPlots, A-3-3 = Block A-Plot 3-Replica 3 in one of the 16 SubPlots, A-3-4 = Block A-Plot 3-Replica 4 in one of the 16 SubPlots, A-3-5 = Block A-Plot 3-Replica 5 in one of the 16 SubPlots, A-4-1 = Block A-Plot 4-Replica 1 in one of the 16 SubPlots, A-4-2 = Block A-Plot 4-Replica 2 in one of the 16 SubPlots, A-4-3 = Block A-Plot 4-Replica 3 in one of the 16 SubPlots, A-4-4 = Block A-Plot 4-Replica 4 in one of the 16 SubPlots, A-4-5 = Block A-Plot 4-Replica 5 in one of the 16 SubPlots, B-1-1 = Block B-Plot 1-Replica 1 in one of the 16 SubPlots, B-1-2 = Block B-Plot 1-Replica 2 in one of the 16 SubPlots, B-1-3 = Block B-Plot 1-Replica 3 in one of the 16 SubPlots, B-1-4 = Block B-Plot 1-Replica 4 in one of the 16 SubPlots, B-1-5 = Block B-Plot 1-Replica 5 in one of the 16 SubPlots, B-2-1 = Block B-Plot 2-Replica 1 in one of the 16 SubPlots, B-2-2 = Block B-Plot 2-Replica 2 in one of the 16 SubPlots, B-2-3 = Block B-Plot 2-Replica 3 in one of the 16 SubPlots, B-2-4 = Block B-Plot 2-Replica 4 in one of the 16 SubPlots, B-2-5 = Block B-Plot 2-Replica 5 in one of the 16 SubPlots, B-3-1 = Block B-Plot 3-Replica 1 in one of the 16 SubPlots, B-3-2 = Block B-Plot 3-Replica 2 in one of the 16 SubPlots, B-3-3 = Block B-Plot 3-Replica 3 in one of the 16 SubPlots, B-3-4 = Block B-Plot 3-Replica 4 in one of the 16 SubPlots, B-3-5 = Block B-Plot 3-Replica 5 in one of the 16 SubPlots, B-4-1 = Block B-Plot 4-Replica 1 in one of the 16 SubPlots, B-4-2 = Block B-Plot 4-Replica 2 in one of the 16 SubPlots, B-4-3 = Block B-Plot 4-Replica 3 in one of the 16 SubPlots, B-4-4 = Block B-Plot 4-Replica 4 in one of the 16 SubPlots, B-4-5 = Block B-Plot 4-Replica 5 in one of the 16 SubPlots, C-1-1 = Clock C-Plot 1-Replica 1 in one of the 16 SubPlots, C-1-2 = Clock C-Plot 1-Replica 2 in one of the 16 SubPlots, C-1-3 = Clock C-Plot 1-Replica 3 in one of the 16 SubPlots, C-1-4 = Clock C-Plot 1-Replica 4 in one of the 16 SubPlots, C-1-5 = Clock C-Plot 1-Replica 5 in one of the 16 SubPlots, C-2-1 = Clock C-Plot 2-Replica 1 in one of the 16 SubPlots, C-2-2 = Clock C-Plot 2-Replica 2 in one of the 16 SubPlots, C-2-3 = Clock C-Plot 2-Replica 3 in one of the 16 SubPlots, C-2-4 = Clock C-Plot 2-Replica 4 in one of the 16 SubPlots, C-2-5 = Clock C-Plot 2-Replica 5 in one of the 16 SubPlots, C-3-1 = Clock C-Plot 3-Replica 1 in one of the 16 SubPlots, C-3-2 = Clock C-Plot 3-Replica 2 in one of the 16 SubPlots, C-3-3 = Clock C-Plot 3-Replica 3 in one of the 16 SubPlots, C-3-4 = Clock C-Plot 3-Replica 4 in one of the 16 SubPlots, C-3-5 = Clock C-Plot 3-Replica 5 in one of the 16 SubPlots, C-4-1 = Clock C-Plot 4-Replica 1 in one of the 16 SubPlots, C-4-2 = Clock C-Plot 4-Replica 2 in one of the 16 SubPlots, C-4-3 = Clock C-Plot 4-Replica 3 in one of the 16 SubPlots, C-4-4 = Clock C-Plot 4-Replica 4 in one of the 16 SubPlots, C-4-5 = Clock C-Plot 4-Replica 5 in one of the 16 SubPlots
DATA TYPE	datetime	alphanumeric	datetime	datetime
MISSING DATA CODES

VARIABLES (ATTRIBUTES)

File Name or # above (all in which the variable appears)	1	1	1
AbbreviationAbbreviation(as it appears on the data file)	ReportCO2Flux_ugCcm-2hr-1	ReportCH4Flux_ngCcm-2hr-1	ReportN2OFlux_ngCcm-2hr-1
NAME OF VARIABLE	Reported CO2Flux	Reported CH4 Flux	Reported N2O Flux
DEFINITION OF VARIABLE	Reported carbon dioxide (CO2) flux (in ug C cm-2 hr-1)	Reported Methane (CH4) Flux (in ng C cm-2 hr-1)	Reported Nitrous oxide (N2O) flux ( in ng N cm-2 hr-1)
UNIT	microgram of Carbon per squarecentimeters per hour	nanogram of Carbon per squareCentimeters per hour	nanogram of Nitrogen per squareCentimeters per hour
PRECISION	.01	.01	.01
RANGE OR LIST OF VALUES
DATA TYPE	decimal	decimal	decimal
MISSING DATA CODES

COMPUTATIONAL METHODS:

FOR DATA MANAGER USE ONLY

STAGE OF DATA SET MANAGEMENT (dates):
RECEIVED: Metadata received: May 15, 2009
ENTERED: May 19, 2009
FILED ON-LINE:
REVIEWED BY RESEARCHER:

FILING MEDIA:
NAME OF DOCUMENTATION FILE: lterdb164.htm, CTE data form for Eda-CTEFluxes.doc
NAME OF ON - LINE CATALOG: LTERDBAS
RECORD #: 164
DOCUMENT TYPE: binary only
PRIORITY TO BE ENTERED: N/A

Rev. date of this form: 28 July 200/ 15 July  2001/June 9, 2003/March 16, 2004/12 April 2005/ 8 November 2005/ 16 January 2006