Dataset

Database Code

SP010

Title

Respiration in soils collected from the REU synoptic sample grid in the Andrews Experimental Forest, 1994-1995

Abstract

The 1993 (SP005) 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 entity 2. CO is measured over a period of 41 weeks in soils collected from all of the REU synoptic sample sites in the summer of 1994. Soils were weighted at the same time that respiration was assayed and moisture content was maintained at the same level throughout the series. The time period represented by this data is 15 September 1994 to 12 July 1995. In the initial stages, CO concentrations were assayed every week, after 15 weeks, the incubation period was extended to 2 weeks. After the incubation vessels were assayed, the headspace was flushed with lab air and the moisture was adjusted with sterile deionized water. Results show that there was a very high correlation between respiration rates during the 1st and 3rd weeks (r = 0.96) suggesting that the two week incubation period we us as an indicator of initial concentrations of labile carbon is valid. There was also a high correlation between rates observed within the first week and rates observed after 41 weeks (r = 0.85) suggesting that the initial rates provide a good relative guide to rates observed after 10 months. In addition, respiration rates after 41 weeks were 80% of those observed during the first week.

Keywords

soil respiration; respiration; inorganic nutrients; soil; forests; Long-Term Ecological Research (LTER); inorganic nutrients

Date begin

1994-09-15

Date end

1995-12-07

Principal Investigator

Robert P. Griffiths

Entities

1. SP01001
2. SP01002
3. SP01003

1. SP01001 - Attribute list

2. SP01002 - Attribute list

3. SP01003 - Attribute list

Attribute definitions

ASPECT

Site aspect

CHANGES

Changes from original location done in 1998

COMMON_NAME

Common name

DBCODE

FSDB Database Code

DIRECTION

Site direction from road

ELEVATION

Elevation of site

ENTITY

Entity number

LATIN_NAME

Scientific Name

LATITUDE

Latitude of site

LOCATION

Site location

LONGITUDE

Longitude of site

POSITION

Position relative to road

RESP

CO2 respired during measurement week (duration from current week to previously measured week)

SAMPLEDATE

Approximate sample date based on start of study and week number (actual dates were not provided)

SITE_NO

Site number for reu synoptic sample grid

SSSG_SITE

Soil synoptic sample grid sitecode

STANDAGE

Stand age

VEGETATION

Codes of vegetation present at site

VEG_CODE

Species code

WEEK_NO

Measurement week (duration is from current week to previously measured week)

Enumerated domains

Enumerated domain for attribute: DBCODE

Enumerated domain for attribute: SSSG_SITE

Enumerated domain for attribute: ASPECT

Enumerated domain for attribute: DIRECTION

Enumerated domain for attribute: STANDAGE

Enumerated domain for attribute: LATIN_NAME