|
Study Number: |
1013 |
|---|---|
|
Project Title: |
Terrestrial gradient microclimate measurements. |
|
Investigator(s): |
Lloyd Swift (Retired) E-Mail |
| Affiliated Institution(s): |
University of Georgia
(Argo, Kloeppel,
Steiner, Taylor, Zausen) USDA Forest Service (Swift) |
| Address: |
Coweeta Hydrologic
Laboratory 3160 Coweeta Lab Road Otto, North Carolina 28763 USA |
| Study Type: | Terrestrial |
| Project Type: | Coweeta Core Research |
| Study Period: |
08/1991 - Present |
| Status/Notes: | |
| Funding Source(s): |
National Science Foundation, DEB-9632854 (Text Version) and DEB-0218001 (Text Version) to Coweeta LTER. |
| Abstract: |
The terrestrial gradient
study at Coweeta compares vegetation, soils, and understory microclimate
of five sites: 118 low elevation (782 m) pine-oak, 218 low elevation
(795 m) cove hardwood, 318 low elevation (865 m) mixed oak, 427 high
elevation (1001 m) mixed oak, 527 high elevation (1347 m) northern
hardwood. Understory microclimate stations were installed in
representative locations at the
downslope margin of each 20 x 40 m gradient plot (within the 80 x 80 m
plot). Resources
for students about terms used
in this study:Forest layers - Source: Boise National Forest, US Forest Service Microclimate - Source: United Kingdom's Met Office Air temperature patterns - Source: University of Wisconsin - Stevens Point Soil Water Content - Source: University of Sydney |
| Location(s), Described: |
Watershed 18 and
Watershed 27. See Project Summary Sheet 1048 and Terrestrial Gradient Sites: Characteristics (photographs) for detailed information about plot locations and physical descriptions, respectively. X and Y tape-measurement coordinates submitted by Paige Carithers on 14 May 2001. |
| Location(s), Download GPS: | ArcView Shape Files (shp.): UTM, NAD83, Zone 17 | Lat/Lon |
| Location(s), Online Map(s): |
USGS Topographic-based Maps of Research Sites(Printable for fieldwork) |
| Methods/Experimental Design: |
All variables are collected
with a Campbell Scientific, Inc. automated data logger - Model CR10. Air
temperature and relative humidity sensors (Campbell Model 207) are
exposed approximately 1.3 m above the forest floor. Soil temperature
sensors are buried at 5 cm, 20 cm, and 50 cm below the soil-leaf litter interface
by inserting sensor into the undisturbed sidewall of a small pit. Soil
temperatures were originally collected with Model 107 thermistor
sensors, later replaced with thermocouples constructed from 18 gage
copper-constantan wire. Soil temperature sensors at 50 cm were
added October, 2000. Water content measurements at the Top (0-30
cm and 30-60 cm) and Bottom (0-30 cm and 30-60 cm) commenced March 1999.
Stored data are copied from the logger approximately every 14-30 days. After 2001, relative humidity, air temperature, and soil temperature manual observations were discontinued. Quality Assurance/Quality Control Procedures: Prior to 2001 the following QAQC procedures were used for air temperature and soil temperature: Air Temperature: Minimum and maximum air temperatures recorded by the datalogger over a 2-4 week period are compared to a maximum/minimum thermometer installed below the sensor. If discrepancies of >2 degrees C occur, the thermometer is replaced. Following this, if the discrepancy continues, the sensor is replaced. Soil Temperature: Soil temperatures recorded using thermocouples wired to a datalogger are compared to readings taken using a REOTEMP soil thermometer. Because these measurements cannot be taken in exactly the same location, identical temperatures are not expected. If the thermometer readings are consistently higher or lower at one location than the thermocouple measurement, the thermocouple is replaced. Current QAQC procedures are conducted
monthly using SAS software to plot data and examine the ranges of soil
and air temperature and soil water content. Data determined to be
inaccurate are deleted. See attached
table and
maps for grid
locations. |
| Sampling Frequency: | Hourly means are calculated from 15 minute observations until 30 October 1997. Thereafter, hourly means are calculated from one minute observations. |
| Data Columns: |
Daily values are the means of the hourly values.
Monthly values are the means of the daily values. Hourly: Site - Site number, see Terrestrial Gradient Plots Physical Descriptions Year - Year sample taken Julian date - Julian day Time - Hour sample taken Air T - Air temperature at 1.3 meters Humidity - Humidity Soil T 5 - Soil temperature at a depth of 5 cm Soil T 20 - Soil temperature at a depth of 20 cm Soil T 50 - Soil temperature at a depth of 50 cm Ref Temp - Reference temperature WC Top 0-30cm - Percent water content, top 0 – 30 cm WC Top 30-60cm - Percent water content, top 30 – 60 cm WC Btm 0-30cm - Percent water content, bottom 0 – 30 cm WC Btm 30-60cm - Percent water content, bottom 30 – 60 cm Daily: site - Site number, see Terrestrial Gradient Plots Physical Descriptions year - Year sample taken month - Month sample taken julday - Julian day mairtemp - Air temperature at 1.3 meters mhumid - Humidity msoilt05 - Soil temperature at a depth of 5 cm msoilt20 - Soil temperature at a depth of 20 cm msoilt50 - Soil temperature at a depth of 50 cm mreftemp - Reference temperature mwctop30 - Percent water content, top 0 – 30 cm mwctop60 - Percent water content, top 30 – 60 cm mwcbot30 - Percent water content, bottom 0 – 30 cm mwcbot60 - Percent water content, bottom 30 – 60 cm Monthly: site - Site number, see Terrestrial Gradient Plots Physical Descriptions year - Year sample taken month - Month sample taken mairtemp - Air temperature at 1.3 meters mhumid - Humidity msoilt05 - Soil temperature at a depth of 5 cm msoilt20 - Soil temperature at a depth of 20 cm msoilt50 - Soil temperature at a depth of 50 cm mreftemp - Reference temperature mwctop30 - Percent water content, top 0 – 30 cm mwctop60 - Percent water content, top 30 – 60 cm mwcbot30 - Percent water content, bottom 0 – 30 cm mwcbot60 - Percent water content, bottom 30 – 60 cm Missing Data Codes: . (Period) |
| Publications: |
None. |
| Data Restrictions: | Users must adhere to the Coweeta LTER Data Policy. |
| Metadata: | EML Format (XML Schema) | Information about EML |
| Data Downloads: |
Monthly Data: 1991 - 2007: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) Daily Data: 1991 - 1995: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1996 - 2000: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2001 - 2005: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2006 - 2007: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) Hourly Data: 1991: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1992: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1993: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1994: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1995: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1996: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1997: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1998: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 1999: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2000: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2001: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2002: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2003: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2004: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2005: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2006: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) 2007: Microsoft® Excel (.xls) | Text Comma Delimited (.csv) | DBase (.dbf) IM PROCESS 1002: ARCHIVING Project 1013 |