# Nitrogen fixation and respiration potential of conifer logs at Andrews Experimental Forest, 1987 to 2006 ## Dataset - **Database Code:** TD018 - **Title:** Nitrogen fixation and respiration potential of conifer logs at Andrews Experimental Forest, 1987 to 2006 - **Abstract:** These data provide a time series of changes in nitrogen fixation rates, and respiration rates for four common PNW species. The purpose is to understand when these rates reach a maximum. - **Keywords:** water content; respiration rates; respiration; nitrogen fixation; inorganic nutrients; coarse woody debris; nitrogen; organic matter; terrestrial ecosystems; logs; Long-Term Ecological Research (LTER); moisture stress; inorganic nutrients; organic matter - **Temporal coverage:** 1987-03-01 to 2006-05-15 - **Principal Investigator:** Mark E. Harmon ## Data Entities 1. TD01801 2. TD01802 3. TD01803 4. TD01804 ## Entity 1: TD01801 ### Attribute list - **DBCODE** — varchar, enum FSDB Database code - **TD018** — FSDB database code TD018 - **ENTITY** — numeric(1.000000), range 1.0000 1.0000, number Entity number - **STUDYID** — varchar, enum Location of the sample collection - **HJA** — Andrews Experimental Forest (HJA) - **YEAR** — datetime, freetext Year of sample collection - **TIME** — numeric(1.000000), range 4.0000 248.0000, number Time in months that the log has been rotting in the field. - **SITE** — varchar, enum Site that the log samples were removed from; refers to sites described under TD14 studies - **1** — End of 327 road - **4** — W of 350 road near junction of 350 and 1506 - **SPECIES** — varchar, enum Species of the log sampled; follows garrison conventions - **ABAM** — Abies amabilis - **PSME** — Pseudotsuga menziesii - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla - **TISSUE** — varchar, enum Tissue type of the log sampled - **HW** — Heartwood - **IB** — Inner bark - **OB** — Outer bark - **SW** — Sapwood - **POSITION** — varchar, enum Position in cross-section sampled - **T** — Top of log - **S** — Side of log - **B** — Bottom of log - **M** — Mixed position; taken from any position randomly - **NUMBER** — numeric(1.000000), range 1.0000 741.0000, number Number of test tube used for incubation - **REP** — varchar, freetext Replicate for species and tissue type - **ETHYLENE** — numeric(0.001000), range -3.8800 75.9250, parts per million Ethylene produced during incubation - **ETIME** — numeric(1.000000), range 0.0000 29.0000, number of hours Length of the ethylene incubation - **PRODE** — numeric(0.001000), range -3.7090 129.7900, nanomoles per gram per day Production rate of ethylene on a gram dry weight per day basis - **CO2** — numeric(0.001000), range -0.3600 3.3000, percent CO2 increase over incubation - **TIMECO2** — numeric(0.010000), range -0.0100 4.7500, number of hours Length of the CO2 incubation - **RESPIR** — numeric(0.000100), range -2.4400 9.7300, micromoles per gram per hour Respiration rate at 15 deg C (dry weight basis) - **DRYWT** — numeric(0.010000), range 0.1300 3.8300, grams Dry weight - **WETWT** — numeric(0.010000), range 0.9500 3.7600, grams Wet weight - **MC** — numeric(0.100000), range 6.5000 1488.0000, percent Moisture content of the samples - **OXYGEN** — numeric(1.000000), range 0.0000 2.0000, percent Oxygen at start of the ethylene incubation - **SAMPLEDATE** — datetime, freetext Date of sample collection ## Entity 2: TD01802 ### Attribute list - **DBCODE** — varchar, enum FSDB Database code - **TD018** — FSDB database code TD018 - **ENTITY** — numeric(1.000000), range 2.0000 2.0000, number Entity number - **STUDYID** — varchar, enum Location of the sample collection - **HJA** — Andrews Experimental Forest (HJA) - **YEAR** — datetime, freetext Year of sample collection - **TIME** — numeric(1.000000), range 0.0000 140.0000, number Time in months that the log has been rotting in the field. - **SPECIES** — varchar, enum Species of the log sampled; follows garrison conventions - **ABAM** — Abies amabilis - **PSME** — Pseudotsuga menziesii - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla - **TISSUE** — varchar, enum Tissue type of the log sampled - **HW** — Heartwood - **IB** — Inner bark - **OB** — Outer bark - **SW** — Sapwood - **MEANPRODE** — numeric(0.001000), range 0.0000 28.7100, nanomoles per gram per day Mean production rate of ethylene on a gram dry weight per day basis - **STDERRE** — numeric(0.001000), range 0.0000 20.2940, nanomoles per gram per day Standard error of ethylene production. note that all negative valuses weres et to 0 before calculation. - **NE** — numeric(1.000000), range 0.0000 24.0000, number Number of samples used to calculate the mean ethylene production - **MEANRESP** — numeric(0.000100), range 0.0000 8.7240, micromoles per gram per hour Mean respiration rate (dry weight basis) - **STERRR** — numeric(0.000100), range 0.0000 1.4245, micromoles per gram per hour Standard error of the respiration measurements (dry weight basis) - **NRESP** — numeric(1.000000), range 3.0000 24.0000, number Number of samples used to compute the rrespiration rate - **MC** — numeric(0.100000), range 0.0000 575.6000, percent Moisture content of the samples - **STDERRMC** — numeric(0.100000), range 0.0000 230.0000, percent Standard error of the moisture content - **NMC** — numeric(1.000000), range 0.0000 24.0000, number Number of samples used to calculate the moisture content ## Entity 3: TD01803 ### Attribute list - **DBCODE** — varchar, enum FSDB Database code - **TD018** — FSDB database code TD018 - **ENTITY** — numeric(1.000000), range 3.0000 3.0000, number Entity number - **STUDYID** — varchar, enum Location of the sample collection - **HJA** — Andrews Experimental Forest (HJA) - **YEAR** — datetime, freetext Year of sample collection - **TIME** — numeric(1.000000), range 0.0000 140.0000, number Time in months that the log has been rotting in the field. - **SUB** — varchar, enum Tissues of the log sampled. also called substrate. - **HW** — Hardwood - **IB** — Inner bark - **OB** — Outer bark - **SW** — Softwood - **SPECIES** — varchar, enum Species of the log sampled; follows garrison conventions - **ABAM** — Abies amabilis - **PSME** — Pseudotsuga menziesii - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla - **SUBDEN** — numeric(0.001000), range 0.1480 0.5710, grams per cubic centimeter Mean density of tissue at sample time. - **LOGDEN** — numeric(0.001000), range 0.1920 0.4540, grams per cubic centimeter Mean density of the log at sample time. used to calcualte the relative mass of a tissue type. - **SAMPLEDATE** — datetime, freetext Date of sample collection ## Entity 4: TD01804 ### Attribute list - **DBCODE** — varchar, enum FSDB Database code - **TD018** — FSDB database code TD018 - **ENTITY** — numeric(1.000000), range 4.0000 4.0000, number Entity number - **STUDYID** — varchar, enum Location of the sample collection - **HJA** — Andrews Experimental Forest (HJA) - **TIME** — numeric(1.000000), range 1.0000 140.0000, number Time in months that the log has been rotting in the field. - **SPECIES** — varchar, enum Species of the log sampled; follows garrison conventions - **ABAM** — Abies amabilis - **PSME** — Pseudotsuga menziesii - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla - **SECTION** — varchar, freetext Cross-section of log the tissue samples were pooled from. - **LOGETHYL** — numeric(0.001000), range 0.0000 8.9640, nanomoles per gram per day Weighted mean rate of ethylene production for entire log. tissue samples were weighted by relative mass (dry weight basis) - **LOGRESP** — numeric(0.010000), range 0.0000 2.8000, micrograms per gram per day Weighted mean respiration potential at 15 deg C for entire logs. tissue samples were weighted by relative mass (dry weight basis) - **LOGMC** — numeric(0.100000), range 0.0000 438.0000, percent Weighted mean moisture content for logs. tissue values were weighted by relative mass. ## Attribute Definitions **CO2** CO2 increase over incubation **DBCODE** FSDB Database code **DRYWT** Dry weight **ENTITY** Entity number **ETHYLENE** Ethylene produced during incubation **ETIME** Length of the ethylene incubation **LOGDEN** Mean density of the log at sample time. used to calcualte the relative mass of a tissue type. **LOGETHYL** Weighted mean rate of ethylene production for entire log. tissue samples were weighted by relative mass (dry weight basis) **LOGMC** Weighted mean moisture content for logs. tissue values were weighted by relative mass. **LOGRESP** Weighted mean respiration potential at 15 deg C for entire logs. tissue samples were weighted by relative mass (dry weight basis) **MC** Moisture content of the samples **MEANPRODE** Mean production rate of ethylene on a gram dry weight per day basis **MEANRESP** Mean respiration rate (dry weight basis) **NE** Number of samples used to calculate the mean ethylene production **NMC** Number of samples used to calculate the moisture content **NRESP** Number of samples used to compute the rrespiration rate **NUMBER** Number of test tube used for incubation **OXYGEN** Oxygen at start of the ethylene incubation **POSITION** Position in cross-section sampled **PRODE** Production rate of ethylene on a gram dry weight per day basis **REP** Replicate for species and tissue type **RESPIR** Respiration rate at 15 deg C (dry weight basis) **SAMPLEDATE** Date of sample collection **SECTION** Cross-section of log the tissue samples were pooled from. **SITE** Site that the log samples were removed from; refers to sites described under TD14 studies **SPECIES** Species of the log sampled; follows garrison conventions **STDERRE** Standard error of ethylene production. note that all negative valuses weres et to 0 before calculation. **STDERRMC** Standard error of the moisture content **STERRR** Standard error of the respiration measurements (dry weight basis) **STUDYID** Location of the sample collection **SUB** Tissues of the log sampled. also called substrate. **SUBDEN** Mean density of tissue at sample time. **TIME** Time in months that the log has been rotting in the field. **TIMECO2** Length of the CO2 incubation **TISSUE** Tissue type of the log sampled **WETWT** Wet weight **YEAR** Year of sample collection ## Enumerated Domains ### DBCODE - **TD018** — FSDB database code TD018 ### STUDYID - **HJA** — Andrews Experimental Forest (HJA) ### SITE - **1** — End of 327 road - **4** — W of 350 road near junction of 350 and 1506 ### SPECIES - **ABAM** — Abies amabilis - **PSME** — Pseudotsuga menziesii - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla ### TISSUE - **HW** — Heartwood - **IB** — Inner bark - **OB** — Outer bark - **SW** — Sapwood ### POSITION - **T** — Top of log - **S** — Side of log - **B** — Bottom of log - **M** — Mixed position; taken from any position randomly ### SUB - **HW** — Hardwood - **IB** — Inner bark - **OB** — Outer bark - **SW** — Softwood