# Comparison of terrestrial versus aquatic decomposition rates of logs at the Andrews Experimental Forest, 1985 to 2015 ## 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 - **Temporal coverage:** 1985-06-04 to 2015-06-16 - **Principal Investigator:** Mark E. Harmon ## Data Entities 1. TD01701 2. TD01702 3. TD01703 4. TD01704 ## Entity 1: TD01701 ### Attribute list - **DBCODE** — varchar, freetext FSDB Database code - **ENTITY** — numeric(1.000000), range 1.0000 1.0000, number Entity number - **STUDYID** — varchar, enum Study area id - **ULC** — Upper Lookout Creek - **YEAR** — numeric(1.000000), range 1985.0000 2015.0000, number Year of observation - **NUMBER** — numeric(1.000000), range 0.0000 280.0000, number Log number - **SPECIES** — varchar, enum Species of log - **ALRU** — Alnus rubra - **PSME** — Pseudotsuga menziesii - **TSHE** — Tsuga heterophylla - **LOCATION** — varchar, enum Location of log, stream = a, land = t - **T** — Terrestrial or upland site - **A** — Aquatic or stream site - **POSITION** — varchar, freetext 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 - **LENGTH** — numeric(1.000000), range 150.0000 270.0000, centimeters Length of log - **BARKCOVER** — numeric(5.000000), range 0.0000 100.0000, percent Portion of log covered by bark, includes inner and outer bark - **X0** — numeric(1.000000), range 0.0000 0.0000, centimeters The point where diameter measurement was taken for the large end of the log - **DM0** — numeric(2.000000), range 109.0000 330.0000, millimeters Diameter measurement of the large end of the log - **X1** — numeric(1.000000), range 10.0000 53.0000, centimeters The point where first cross-section was removed - **DM1** — numeric(2.000000), range 109.0000 312.0000, millimeters Diameter measurement of the first cross-section - **X2** — numeric(1.000000), range 40.0000 94.0000, centimeters Point where second cross-section was removed - **DM2** — numeric(2.000000), range 87.0000 308.0000, millimeters Diamter measurement of the second cross-section - **X3** — numeric(1.000000), range 65.0000 140.0000, centimeters The point where third cross-section was removed - **DM3** — numeric(2.000000), range 17.0000 306.0000, millimeters Diameter measurement of the third cross-section - **X4** — numeric(1.000000), range 91.0000 221.0000, centimeters The point where fourth cross-section was removed - **DM4** — numeric(2.000000), range 25.0000 303.0000, millimeters Diameter measurement of the fourth cross-section - **X5** — numeric(1.000000), range 120.0000 255.0000, centimeters The point where fifth cross-section was removed - **DM5** — numeric(2.000000), range 0.0000 303.0000, millimeters Diameter measurement of the fifth cross-section - **X6** — numeric(1.000000), range 147.0000 262.0000, centimeters The point where the sixth cross-section was removed - **DM6** — numeric(2.000000), range 0.0000 298.0000, millimeters Diameter measurement of the sixth cross-section - **X7** — numeric(1.000000), range 150.0000 270.0000, centimeters Position of the small end of the log, should equal the total length - **DM7** — numeric(2.000000), range 0.0000 318.0000, millimeters Diameter at the small end of the log - **SAMPLEDATE** — datetime, freetext Date of observation ## Entity 2: TD01702 ### Attribute list - **DBCODE** — varchar, freetext FSDB Database code - **ENTITY** — numeric(1.000000), range 2.0000 2.0000, number Entity number - **STUDYID** — varchar, enum Study area id - **ULC** — Upper Lookout Creek - **YEAR** — numeric(1.000000), range 1985.0000 1985.0000, number Year of observation - **NUMBER** — numeric(1.000000), range 1.0000 280.0000, number Log number - **END_REM** — varchar, enum The end of log cross-section was removed, 1=large end, 2=small end - **2** — Small end - **1** — Large end - **HWT** — numeric(1.000000), range 0.0000 131.0000, centimeters Radial thickness of heartwood - **SWT** — numeric(1.000000), range 4.0000 153.0000, centimeters Radial thickness of softwood - **IBT** — numeric(1.000000), range 1.0000 7.0000, centimeters Radial thickness of inner bark - **OBT** — numeric(1.000000), range 1.0000 18.0000, centimeters Radial thickness of outer bark - **SAMPLEDATE** — datetime, freetext Date of observation ## Entity 3: TD01703 ### Attribute list - **DBCODE** — varchar, freetext FSDB Database code - **ENTITY** — numeric(1.000000), range 3.0000 3.0000, number Entity number - **STUDYID** — varchar, enum Study area id - **ULC** — Upper Lookout Creek - **YEAR** — numeric(1.000000), range 1985.0000 2015.0000, number Year of observation - **NUMBER** — numeric(1.000000), range 0.0000 280.0000, number Log number - **POS** — varchar, enum Position of sample (consecutive alpha codes for sample sections) 2=small end - **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 - **SUBSTR** — varchar, enum Code for type of substrate sampled - **OB** — Outer bark - **IB** — Inner bark - **HW** — Heartwood - **SW** — Sapwood - **W** — Undifferentiated wood; unable to distinguish SW from HW - **VOLFORM** — varchar, enum Code for equation to be used in calculating the volume from variables d1, d2 d3 - **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 - **D1** — numeric(1.000000), range 1.0000 810.0000, millimeters Length in dimension 1 - **D2** — numeric(1.000000), range 1.0000 435.0000, millimeters Length in dimension 2 - **D3** — numeric(1.000000), range 0.4000 417.0000, millimeters Length in dimension 3 - **D4** — numeric(1.000000), range 43.0000 161.0000, millimeters Length in dimension 4, used only when volform = 4 - **WETWTD** — numeric(0.010000), range 37.0000 226450.0000, grams Fresh weight of total sample - **DRYWTD** — numeric(0.010000), range 4.0000 121229.0000, grams Oven-dry weight of total sample - **WETWTM** — numeric(1), range 504.0000 26300.0000, grams Wet weight of moisture content sample (subsample of total sample) - **DRYWTM** — numeric(1), range 288.0000 9890.0000, grams Dry weight of moisture content sample (subsample of total sample) - **WVOL** — numeric(1.000000), range 20.0000 600.0000, milliliters Volume from water displacement - **CVOL** — numeric(1.000000), range 480.0000 925037.0000, number Volume calculated from measurement - **DEN** — numeric(1.000000), range 1.0000 1462.0000, milliliters Density of sample - **MC** — numeric(1.000000), range 11.0000 825.0000, percent Moisture content of sample - **SAMPLEDATE** — datetime, freetext Date of observation ## Entity 4: TD01704 ### Attribute list - **DBCODE** — varchar, freetext FSDB Database code - **ENTITY** — numeric(1.000000), range 4.0000 4.0000, number Entity number - **STUDYID** — varchar, enum Study area id - **ULC** — Upper Lookout Creek - **YEAR** — numeric(1.000000), range 1985.0000 2015.0000, number Year of observation - **NUMBER** — numeric(1.000000), range 1.0000 280.0000, number Log number - **MAXVOL** — numeric(0.000000), range 884.0000 21192.0000, cubic meters Maximum volume of log based on exterior measurements on cardtype 1. assume shape is frustrum of cone. - **TVOL** — numeric(1.000000), range 3833.0000 19013.0000, cubic meters Total vol based on length on cardtype 1 and radial measure mentson cardtype 2. incl bark loss. shape is frustrum of cone. - **FVH** — numeric(1.000000), range 0.0000 87.0000, percent Fractional volume of heartwood (not calculated for alru). shape is frustrum of cone for this and next 3 variables - **FVI** — numeric(1.000000), range 0.0000 11.0000, percent Fractional volume of inner bark (not calc for alru) - **FVO** — numeric(1.000000), range 0.0000 21.0000, percent Fractioanl volume of outer bark (for alru this includes in ner bark) - **FVS** — numeric(1.000000), range 8.0000 100.0000, percent Fractioanl volume of sapwood - **TMASS** — numeric(1.000000), range 474.0000 99041.0000, grams Total dry mass of log. - **FMH** — numeric(1.000000), range 0.0000 92.0000, percent Fractional mass of heartwood. fmh = (fvh*tvol*denh)/tmass. - **FMI** — numeric(1.000000), range 0.0000 12.0000, percent Fractional mass of inner bark. not calculated for alru. see fmh for formula. - **FMO** — numeric(1.000000), range 0.0000 100.0000, percent Fractional mass of outer bark. see fmh for formula. for al ru this includes inner bark. - **FMS** — numeric(1.000000), range 0.0000 100.0000, percent Fractional mass of sapwood. see fmh for formula. - **DENH** — numeric(0.001000), range 0.0000 0.6350, grams per milliliter Mean density (n=2) of heartwood for log. - **DENI** — numeric(0.001000), range 0.0000 0.7000, grams per milliliter Mean density (n=2) of inner bark (not calculated for alru) - **DENO** — numeric(0.001000), range 0.0000 0.9060, grams per milliliter Mean density (n=2) of outer bark. for alru inner and outer bark combined. - **DENS** — numeric(0.001000), range 0.0000 0.6120, grams per milliliter Mean density (n=2) of sapwood. - **MCH** — numeric(1.000000), range 0.0000 332.0000, percent Mean moisture content of sapwood (n=2). not calculated for alru. - **MCI** — numeric(1.000000), range 0.0000 495.0000, percent Mean moisture content of inner bark (n=2). not calculated for alru. - **MCO** — numeric(1.000000), range 0.0000 467.0000, percent Mean moisture content of outer bark (n=2). for alru inner and outer bark combined. - **MCS** — numeric(1.000000), range 0.0000 525.0000, percent Mean moisture content fo sapwood (n=2). - **SAMPLEDATE** — datetime, freetext Date of observation ## 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 ### STUDYID - **ULC** — Upper Lookout Creek ### SPECIES - **ALRU** — Alnus rubra - **PSME** — Pseudotsuga menziesii - **TSHE** — Tsuga heterophylla ### LOCATION - **T** — Terrestrial or upland site - **A** — Aquatic or stream site ### END_REM - **2** — Small end - **1** — Large end ### POS - **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 ### SUBSTR - **OB** — Outer bark - **IB** — Inner bark - **HW** — Heartwood - **SW** — Sapwood - **W** — Undifferentiated wood; unable to distinguish SW from HW ### VOLFORM - **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