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TD017 – Simplified metadata

← Back to TD017 detail

Dataset

Database Code
TD017
Title
Comparison of terrestrial versus aquatic decomposition rates of logs at the Andrews Experimental Forest, 1985 to 2015
Abstract
The data collected from this study describe the decomposition of small logs (20-30 cm diameter, 2 m length) in a stream channel to those on an adjacent upland site at the H. J. Andrews Experimental Forest. The stream is a 3rd order above the junction of Lookout Creek and Mack Creek. Three species of trees are being examined: Douglas-fir, western hemlock, and red alder. Data collection started in 1985 and is scheduled to continue to 2050. Periodically a subset of logs is resampled to determine changes in volume, bark cover, density, and nutrient stores. The last set of samples was collected in 2005. Logs ranging in diameter between 20 and 30 cm of a length of 2 m were cut out of live trees of the three species. Logs were placed by hand along a skid road at the terrestrial site. A cable system was used to place log randomly along a stream reach. The location of logs in the stream is noted when they are sampled. The length and diameter as well as bark cover of each sampled log is noted at the time of sampling (td01701). Six cross-sections are removed with a chainsaw. The thickness of the tissue types is noted (inner bark, outer bark, sapwood, and heartwood) and are described in td01702. Samples of each tissue type are taken to determine their moisture content (water mass/dry mass) and density (dry mass/green volume). Density is derived from dry mass and volume as determined via dimensional measurements. Dimensional data, volumes, masses, density, and moisture content are documented in the td01703 table. The volume of logs and tissue types, the total mass, and proportional mass of the tissue types as well as moisture contents is derived from the data in the other data tables and is stored in the td01704 table.
Keywords
geomorphology; decay rates; decomposition; inorganic nutrients; woody debris; coarse woody debris; organic matter; logs; inorganic nutrients; organic matter
Date begin
1985-06-04
Date end
2015-06-16
Principal Investigator
Mark E. Harmon

Entities

  1. TD01701
  2. TD01702
  3. TD01703
  4. TD01704

1. TD01701 - Attribute list

TD01701 - attributes
Attribute Type Domain Minimum Maximum Unit
DBCODE varchar freetext
ENTITY numeric(1.000000) range 1.0000 1.0000 number
STUDYID varchar enum
YEAR numeric(1.000000) range 1985.0000 2015.0000 number
NUMBER numeric(1.000000) range 0.0000 280.0000 number
SPECIES varchar enum
LOCATION varchar enum
POSITION varchar freetext
LENGTH numeric(1.000000) range 150.0000 270.0000 centimeters
BARKCOVER numeric(5.000000) range 0.0000 100.0000 percent
X0 numeric(1.000000) range 0.0000 0.0000 centimeters
DM0 numeric(2.000000) range 109.0000 330.0000 millimeters
X1 numeric(1.000000) range 10.0000 53.0000 centimeters
DM1 numeric(2.000000) range 109.0000 312.0000 millimeters
X2 numeric(1.000000) range 40.0000 94.0000 centimeters
DM2 numeric(2.000000) range 87.0000 308.0000 millimeters
X3 numeric(1.000000) range 65.0000 140.0000 centimeters
DM3 numeric(2.000000) range 17.0000 306.0000 millimeters
X4 numeric(1.000000) range 91.0000 221.0000 centimeters
DM4 numeric(2.000000) range 25.0000 303.0000 millimeters
X5 numeric(1.000000) range 120.0000 255.0000 centimeters
DM5 numeric(2.000000) range 0.0000 303.0000 millimeters
X6 numeric(1.000000) range 147.0000 262.0000 centimeters
DM6 numeric(2.000000) range 0.0000 298.0000 millimeters
X7 numeric(1.000000) range 150.0000 270.0000 centimeters
DM7 numeric(2.000000) range 0.0000 318.0000 millimeters
SAMPLEDATE datetime freetext

2. TD01702 - Attribute list

TD01702 - attributes
Attribute Type Domain Minimum Maximum Unit
DBCODE varchar freetext
ENTITY numeric(1.000000) range 2.0000 2.0000 number
STUDYID varchar enum
YEAR numeric(1.000000) range 1985.0000 1985.0000 number
NUMBER numeric(1.000000) range 1.0000 280.0000 number
END_REM varchar enum
HWT numeric(1.000000) range 0.0000 131.0000 centimeters
SWT numeric(1.000000) range 4.0000 153.0000 centimeters
IBT numeric(1.000000) range 1.0000 7.0000 centimeters
OBT numeric(1.000000) range 1.0000 18.0000 centimeters
SAMPLEDATE datetime freetext

3. TD01703 - Attribute list

TD01703 - attributes
Attribute Type Domain Minimum Maximum Unit
DBCODE varchar freetext
ENTITY numeric(1.000000) range 3.0000 3.0000 number
STUDYID varchar enum
YEAR numeric(1.000000) range 1985.0000 2015.0000 number
NUMBER numeric(1.000000) range 0.0000 280.0000 number
POS varchar enum
SUBSTR varchar enum
VOLFORM varchar enum
D1 numeric(1.000000) range 1.0000 810.0000 millimeters
D2 numeric(1.000000) range 1.0000 435.0000 millimeters
D3 numeric(1.000000) range 0.4000 417.0000 millimeters
D4 numeric(1.000000) range 43.0000 161.0000 millimeters
WETWTD numeric(0.010000) range 37.0000 226450.0000 grams
DRYWTD numeric(0.010000) range 4.0000 121229.0000 grams
WETWTM numeric(1) range 504.0000 26300.0000 grams
DRYWTM numeric(1) range 288.0000 9890.0000 grams
WVOL numeric(1.000000) range 20.0000 600.0000 milliliters
CVOL numeric(1.000000) range 480.0000 925037.0000 number
DEN numeric(1.000000) range 1.0000 1462.0000 milliliters
MC numeric(1.000000) range 11.0000 825.0000 percent
SAMPLEDATE datetime freetext

4. TD01704 - Attribute list

TD01704 - attributes
Attribute Type Domain Minimum Maximum Unit
DBCODE varchar freetext
ENTITY numeric(1.000000) range 4.0000 4.0000 number
STUDYID varchar enum
YEAR numeric(1.000000) range 1985.0000 2015.0000 number
NUMBER numeric(1.000000) range 1.0000 280.0000 number
MAXVOL numeric(0.000000) range 884.0000 21192.0000 cubic meters
TVOL numeric(1.000000) range 3833.0000 19013.0000 cubic meters
FVH numeric(1.000000) range 0.0000 87.0000 percent
FVI numeric(1.000000) range 0.0000 11.0000 percent
FVO numeric(1.000000) range 0.0000 21.0000 percent
FVS numeric(1.000000) range 8.0000 100.0000 percent
TMASS numeric(1.000000) range 474.0000 99041.0000 grams
FMH numeric(1.000000) range 0.0000 92.0000 percent
FMI numeric(1.000000) range 0.0000 12.0000 percent
FMO numeric(1.000000) range 0.0000 100.0000 percent
FMS numeric(1.000000) range 0.0000 100.0000 percent
DENH numeric(0.001000) range 0.0000 0.6350 grams per milliliter
DENI numeric(0.001000) range 0.0000 0.7000 grams per milliliter
DENO numeric(0.001000) range 0.0000 0.9060 grams per milliliter
DENS numeric(0.001000) range 0.0000 0.6120 grams per milliliter
MCH numeric(1.000000) range 0.0000 332.0000 percent
MCI numeric(1.000000) range 0.0000 495.0000 percent
MCO numeric(1.000000) range 0.0000 467.0000 percent
MCS numeric(1.000000) range 0.0000 525.0000 percent
SAMPLEDATE datetime freetext

Attribute definitions

BARKCOVER
Portion of log covered by bark, includes inner and outer bark
CVOL
Volume calculated from measurement
D1
Length in dimension 1
D2
Length in dimension 2
D3
Length in dimension 3
D4
Length in dimension 4, used only when volform = 4
DBCODE
FSDB Database code
DEN
Density of sample
DENH
Mean density (n=2) of heartwood for log.
DENI
Mean density (n=2) of inner bark (not calculated for alru)
DENO
Mean density (n=2) of outer bark. for alru inner and outer bark combined.
DENS
Mean density (n=2) of sapwood.
DM0
Diameter measurement of the large end of the log
DM1
Diameter measurement of the first cross-section
DM2
Diamter measurement of the second cross-section
DM3
Diameter measurement of the third cross-section
DM4
Diameter measurement of the fourth cross-section
DM5
Diameter measurement of the fifth cross-section
DM6
Diameter measurement of the sixth cross-section
DM7
Diameter at the small end of the log
DRYWTD
Oven-dry weight of total sample
DRYWTM
Dry weight of moisture content sample (subsample of total sample)
END_REM
The end of log cross-section was removed, 1=large end, 2=small end
ENTITY
Entity number
FMH
Fractional mass of heartwood. fmh = (fvh*tvol*denh)/tmass.
FMI
Fractional mass of inner bark. not calculated for alru. see fmh for formula.
FMO
Fractional mass of outer bark. see fmh for formula. for al ru this includes inner bark.
FMS
Fractional mass of sapwood. see fmh for formula.
FVH
Fractional volume of heartwood (not calculated for alru). shape is frustrum of cone for this and next 3 variables
FVI
Fractional volume of inner bark (not calc for alru)
FVO
Fractioanl volume of outer bark (for alru this includes in ner bark)
FVS
Fractioanl volume of sapwood
HWT
Radial thickness of heartwood
IBT
Radial thickness of inner bark
LENGTH
Length of log
LOCATION
Location of log, stream = a, land = t
MAXVOL
Maximum volume of log based on exterior measurements on cardtype 1. assume shape is frustrum of cone.
MC
Moisture content of sample
MCH
Mean moisture content of sapwood (n=2). not calculated for alru.
MCI
Mean moisture content of inner bark (n=2). not calculated for alru.
MCO
Mean moisture content of outer bark (n=2). for alru inner and outer bark combined.
MCS
Mean moisture content fo sapwood (n=2).
NUMBER
Log number
OBT
Radial thickness of outer bark
POS
Position of sample (consecutive alpha codes for sample sections) 2=small end
POSITION
Indicates where log was found or placed. for stream the numbers indicate the 10-m section log occurred, 1=1-10,2-10-20, etc
SAMPLEDATE
Date of observation
SPECIES
Species of log
STUDYID
Study area id
SUBSTR
Code for type of substrate sampled
SWT
Radial thickness of softwood
TMASS
Total dry mass of log.
TVOL
Total vol based on length on cardtype 1 and radial measure mentson cardtype 2. incl bark loss. shape is frustrum of cone.
VOLFORM
Code for equation to be used in calculating the volume from variables d1, d2 d3
WETWTD
Fresh weight of total sample
WETWTM
Wet weight of moisture content sample (subsample of total sample)
WVOL
Volume from water displacement
X0
The point where diameter measurement was taken for the large end of the log
X1
The point where first cross-section was removed
X2
Point where second cross-section was removed
X3
The point where third cross-section was removed
X4
The point where fourth cross-section was removed
X5
The point where fifth cross-section was removed
X6
The point where the sixth cross-section was removed
X7
Position of the small end of the log, should equal the total length
YEAR
Year of observation

Enumerated domains

Enumerated domain for attribute: STUDYID

Codes for STUDYID
Code Description
ULC Upper Lookout Creek

Enumerated domain for attribute: SPECIES

Codes for SPECIES
Code Description
ALRU Alnus rubra
PSME Pseudotsuga menziesii
TSHE Tsuga heterophylla

Enumerated domain for attribute: LOCATION

Codes for LOCATION
Code Description
T Terrestrial or upland site
A Aquatic or stream site

Enumerated domain for attribute: END_REM

Codes for END_REM
Code Description
2 Small end
1 Large end

Enumerated domain for attribute: POS

Codes for POS
Code Description
D Fourth sample from decayed log
E Fifth sample from decayed log
F Sixth sample from decayed log , nearest the small end
C Third sample from decayed log
1 Initial sample from large end of log
A First sample from decayed nearest large end of log
B Second sample from decayed nearest large end of log
2 Initial sample from small end of log

Enumerated domain for attribute: SUBSTR

Codes for SUBSTR
Code Description
OB Outer bark
IB Inner bark
HW Heartwood
SW Sapwood
W Undifferentiated wood; unable to distinguish SW from HW

Enumerated domain for attribute: VOLFORM

Codes for VOLFORM
Code Description
5 Sector of circle: v=d1*d1*(d2/360)*d3.
3 Frustrum of cone: d1=large end diam, d2=small end diam, d3=length, v=pi/3*d3*(d1*d1/4 + d1*d2/2 + d2*d2/4).
1 Cylinder: d1=diameter, d2=length, v=pi/4*d1*d1*d2.
2 Rectangular paralleloid: d1,d2,d3 are lentghs of sides, v=d1*d2*d3.
4 Triangular piece: d1=log side of triangle,d2 = base of triangle, d3=thichness of piece, v=a*d3
6 Donut shape; circle with hollow