SP028
Soils synoptic sampling grid (REU sites) site locations, Andrews Experimental Forest, 1993-2005

CREATOR(S): Robert P. Griffiths

PRINCIPAL INVESTIGATOR(S): Robert P. Griffiths

ORIGINATOR(S): Robert P. Griffiths

OTHER RESEARCHER(S): Bruce A. Caldwell

DATA SET CONTACT PERSON: Theresa J. Valentine

METADATA CONTACT: Theresa J. Valentine

ABSTRACTOR: Theresa J. Valentine

DISTRIBUTOR: Theresa J. Valentine

METADATA CREATION DATE:

3 Nov 2004

MOST RECENT METADATA REVIEW DATE:

4 Mar 2013

KEYWORDS:

soil temperature, soil moisture, soil respiration, carbon flux, gas flux, respiration, carbon cycling, inorganic nutrients

PURPOSE:

To document the geographic locations of study sites.

METHODS:

Processing Procedures - SP028:

Description: SP02801: GPS coordinates were used to generate sample locations from a synoptic soil sampling performed by students as part the Research Experience for Undergraduates program . Data was converted into UTM. Projection for Nad27 was corrected 01/09/1998. Data was checked by Bob Griffiths via a hardcopy map of Digital Orthophotography and individual points were moved as directed by Bob (in 2002). In the initial 1993 study, 130 sites were sampled which were located at 0.5 km intervals along most of the main roads. In 1994, the sampling grid was expanded to 183 sites providing a more comprehensive sampling grid. Because of potential edge effects problems, all sample locations were moved at least 20 meters from the closest road or clearing. Changes from the original location are given in Table 1. While conducting autocorrelation analyses, we found that for the variables studied, samples collected at 5 m intervals were not autocorrelated and could thus be considered independent for statistical analysis. For this reason, replicate samples were taken in plots separated by 5 meters along a transect parallel to the road. Data in geographic projection.

Instrumentation: GPS: locations should be good within 5 meters

Processing Procedures - SP028 (1):

Description: SP02802: GPS coordinates were used to generate sample locations from a synoptic soil sampling performed by students as part the Research Experience for Undergraduates program . Data was converted into UTM. Projection for Nad27 was corrected 01/09/1998. Data was checked by Bob Griffiths via a hardcopy map of Digital Orthophotography and individual points were moved as directed by Bob (in 2002). In the initial 1993 study, 130 sites were sampled which were located at 0.5 km intervals along most of the main roads. In 1994, the sampling grid was expanded to 183 sites providing a more comprehensive sampling grid. Because of potential edge effects problems, all sample locations were moved at least 20 meters from the closest road or clearing. Changes from the original location are given in Table 1. While conducting autocorrelation analyses, we found that for the variables studied, samples collected at 5 m intervals were not autocorrelated and could thus be considered independent for statistical analysis. For this reason, replicate samples were taken in plots separated by 5 meters along a transect parallel to the road. Dataset copied from reusites.shp and projected to utm zone 10. projected to Nad83 Datum

Instrumentation: GPS locations should be good within 5 meters

TAXONOMIC SYSTEM:

None

ELEVATION_MINIMUM (meters):

ELEVATION_MAXIMUM (meters):

PROGRESS DESCRIPTION:

Complete

UPDATE FREQUENCY DESCRIPTION:

notPlanned

CURRENTNESS REFERENCE:

Observed