# Decomposition of Fine Woody Roots: a Time Series Approach, 1995 to 2006 ## Dataset - **Database Code:** TD031 - **Title:** Decomposition of Fine Woody Roots: a Time Series Approach, 1995 to 2006 - **Abstract:** We examined the effects of species, initial substrate quality, and site differences on woody root decomposition and its nitrogen dynamics in Sitka spruce (Picea sitchensis), Douglas-fir (Pseudotsuga menziesii), and ponderosa pine (Pinus ponderosa) dominated forests in Oregon, U.S.A. using a time series approach. Roots of fourteen species and five size classes were placed in the field to incubate and then collected at pre-planned intervals to determine mass loss and nitrogen content. - **Keywords:** decomposition; inorganic nutrients; nitrogen; organic matter; roots; fine roots; inorganic nutrients; organic matter - **Temporal coverage:** 1995-06-01 to 2006-06-01 - **Principal Investigator:** Mark E. Harmon ## Data Entities 1. TD03101 ## Entity 1: TD03101 ### Attribute list - **DBCODE** — varchar, enum FSDB database code - **TD031** — FSDB database code TD031 (Terrestrial: organic decomposition) - **ENTITY** — numeric(1.000000), range 1.0000 1.0000, number Entity number - **SITE** — varchar, enum Site where samples were incubated - **HJA** — H.J. Andrews Experimental Forest Oregon - **CAH** — Cascade Head Experimental Forest - **PRF** — Pringle Falls Experimental Forest - **REP** — numeric(1.000000), range 1.0000 4.0000, number Replicate number - **TIME** — numeric(1.000000), range 1.0000 6.0000, number The time the litter will be harvested (sequential collection number) - **TIMEOUT** — numeric(0.250000), range 0.2500 2.0000, number of years The amout of time that the root sample incubated in the field - **SPECIES** — varchar, enum Root species code - **ABCO** — Abies concolor - **ABMA** — Abies magnifica - **ABPR** — Abies procera - **ACMA** — Acer macrophyllum - **ALRU** — Alnus rubra - **CADE3** — Calocedrus decurrens - **FRLA2** — Fraxinus latifolia - **PIEN** — Picea engelmannii - **PICO** — Pinus contorta - **PIMO** — Pinus monticola - **PIPO** — Pinus ponderosa - **PSME** — Pseudotsuga menziesii - **PUTR** — Purshia tridentata - **RHMA** — Rhododendron macrophyllum - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla - **CACH** — Castanopsis chrysophylla - **GOBA** — Gonystylus bancanus - **ACRU2** — Acer rubrum - **TYPE** — varchar, enum Diameter class of the root sample, position for the GOBA (dowel) sample - **A** — Aboveground dowel - **B** — Belowground dowel - **F** — Fine root size class <2mm - **J** — Jumbo root size class >100mm - **L** — Large root size class 50-100mm - **M** — Medium root size class 10-50mm - **S** — Small root size class 2-10mm - **SAMP_NUM** — numeric(1.000000), range 1.0000 10804.0000, number Unique sample number, except for GOBA dowels that are differentiated by type - **IODW** — numeric(0.001000), range 0.0000 3549.5000, grams Initial oven dry weight before field incubation - **IASH** — numeric(0.010000), range 0.0000 12.3200, percent Percent of initial sample composed of ash - **IAFODW** — numeric(0.010000), range 0.0000 3525.7200, grams Initial ash-free oven dry weight - **INI_C** — numeric(0.010000), range 44.7400 54.4000, percent Percent of initial sample composed of carbon ((100-iash)/1.9) - **INI_N** — numeric(0.010000), range 0.1300 2.1900, percent Percent of initial sample composed of nitrogen - **INI_C_CONT** — numeric(0.001000), range 0.0000 1805.5200, grams Carbon content of initial sample ashfree basis - **INI_N_CONT** — numeric(0.001000), range 0.0000 7.1170, grams Nitrogen content of initial sample ashfree basis - **FWW** — numeric(0.010000), range 6.7900 9091.2002, grams Final wet weight of sample after field incubation - **FOW** — numeric(0.010000), range 2.1000 3516.0000, grams Final oven dry weight of sample after field incubation - **FASH** — numeric(0.010000), range 0.0100 26.3000, percent Percent of sample composed of ash after field incubation - **FAFOW** — numeric(0.001000), range 1.6170 3463.2600, grams Final ash-free oven dry weight after field incubation - **MOISTURE** — numeric(0.100000), range 2.5000 2439.0000, percent Percent moisture of final sample after field incubation, can be over 100 moisture=100*((fww-fow)/fow) ie. water weight/dry weight * 100 - **MASSLOSS** — numeric(0.010000), range -9.0600 77.2200, percent Percent of the mass of the sample that was lost during incubation - **CARBON** — numeric(0.010000), range 38.7900 52.6300, percent Percent of final sample composed of carbon after field incubation ((100-fash)/1.9) - **CARBON_REM** — numeric(0.010000), range 17.4600 106.0300, percent Percent of initial carbon content (mass) remaining after field incubation ie. final carbon content/initial carbon content - **AF_N** — numeric(0.010000), range 0.0300 2.6000, percent Percent of sample composed of nitrogen after field incubation - **NITRO_REM** — numeric(0.010000), range 10.4200 219.2300, percent Percent of initial nitrogen content (mass) remaining after field incubation ie. final nitrogen content/initial nitrogen content - **C_N_RATIO** — numeric(0.010000), range 18.1800 1728.7000, number Ratio of carbon to nitrogen (c:n) ## Attribute Definitions **AF_N** Percent of sample composed of nitrogen after field incubation **CARBON** Percent of final sample composed of carbon after field incubation ((100-fash)/1.9) **CARBON_REM** Percent of initial carbon content (mass) remaining after field incubation ie. final carbon content/initial carbon content **C_N_RATIO** Ratio of carbon to nitrogen (c:n) **DBCODE** FSDB database code **ENTITY** Entity number **FAFOW** Final ash-free oven dry weight after field incubation **FASH** Percent of sample composed of ash after field incubation **FOW** Final oven dry weight of sample after field incubation **FWW** Final wet weight of sample after field incubation **IAFODW** Initial ash-free oven dry weight **IASH** Percent of initial sample composed of ash **INI_C** Percent of initial sample composed of carbon ((100-iash)/1.9) **INI_C_CONT** Carbon content of initial sample ashfree basis **INI_N** Percent of initial sample composed of nitrogen **INI_N_CONT** Nitrogen content of initial sample ashfree basis **IODW** Initial oven dry weight before field incubation **MASSLOSS** Percent of the mass of the sample that was lost during incubation **MOISTURE** Percent moisture of final sample after field incubation, can be over 100 moisture=100*((fww-fow)/fow) ie. water weight/dry weight * 100 **NITRO_REM** Percent of initial nitrogen content (mass) remaining after field incubation ie. final nitrogen content/initial nitrogen content **REP** Replicate number **SAMP_NUM** Unique sample number, except for GOBA dowels that are differentiated by type **SITE** Site where samples were incubated **SPECIES** Root species code **TIME** The time the litter will be harvested (sequential collection number) **TIMEOUT** The amout of time that the root sample incubated in the field **TYPE** Diameter class of the root sample, position for the GOBA (dowel) sample ## Enumerated Domains ### DBCODE - **TD031** — FSDB database code TD031 (Terrestrial: organic decomposition) ### SITE - **HJA** — H.J. Andrews Experimental Forest Oregon - **CAH** — Cascade Head Experimental Forest - **PRF** — Pringle Falls Experimental Forest ### SPECIES - **ABCO** — Abies concolor - **ABMA** — Abies magnifica - **ABPR** — Abies procera - **ACMA** — Acer macrophyllum - **ALRU** — Alnus rubra - **CADE3** — Calocedrus decurrens - **FRLA2** — Fraxinus latifolia - **PIEN** — Picea engelmannii - **PICO** — Pinus contorta - **PIMO** — Pinus monticola - **PIPO** — Pinus ponderosa - **PSME** — Pseudotsuga menziesii - **PUTR** — Purshia tridentata - **RHMA** — Rhododendron macrophyllum - **THPL** — Thuja plicata - **TSHE** — Tsuga heterophylla - **CACH** — Castanopsis chrysophylla - **GOBA** — Gonystylus bancanus - **ACRU2** — Acer rubrum ### TYPE - **A** — Aboveground dowel - **B** — Belowground dowel - **F** — Fine root size class <2mm - **J** — Jumbo root size class >100mm - **L** — Large root size class 50-100mm - **M** — Medium root size class 10-50mm - **S** — Small root size class 2-10mm