# A chronosequence of woody root decomposition in the Pacific Northwest, 1995 to 1997 ## Dataset - **Database Code:** TD032 - **Title:** A chronosequence of woody root decomposition in the Pacific Northwest, 1995 to 1997 - **Abstract:** Decomposition of woody roots in Sitka spruce (Picea sitchensis (Bong.) Carrière), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), and ponderosa pine (Pinus ponderosa P. Laws. ex C. Laws.) dominated forests in Oregon, U.S.A. was studied using a chronosequence. Roots of five coniferous species were excavated from stumps with ages up to 46 years old. A structural component-oriented approach may provide a better solution to predicting the long-term woody root decomposition than that provided by initial substrate quality indices. This approach examines the decomposition of different components of woody roots separately to predict whole root decomposition. - **Keywords:** chronosequences; decomposition; inorganic nutrients; nitrogen; organic matter; roots; inorganic nutrients; organic matter - **Temporal coverage:** 1995-06-01 to 1997-06-01 - **Principal Investigator:** Mark E. Harmon ## Data Entities 1. TD03201 2. TD03202 ## Entity 1: TD03201 ### Attribute list - **DBCODE** — varchar, enum FSDB database code - **TD032** — FSDB database code TD032 - **ENTITY** — numeric(1.000000), range 1.0000 1.0000, number Entity number - **SITE** — varchar, enum Site where woody root was collected - **HJA** — H.j. andrews experimental forest oregon, pre-1996 - **WRE** — Wind river experimental forest - **PRF** — Pringle falls experimental forest - **CAH** — Cascade head experimental forest - **STAND** — varchar, freetext Name of forest stand, sometimes reflects year cut - **DECAY_AGE** — numeric(1.000000), range 0.0000 50.0000, number of years Amount of years passed since death of tree - **SPECIES** — varchar, enum Species of woody root sample - **PISI** — Picea sitchensis - **PICO** — Pinus contorta - **PIPO** — Pinus ponderosa - **PSME** — Pseudotsuga menziesii - **TSHE** — Tsuga heterophylla - **SAMP_NUM** — varchar, freetext Unique number for individual sample, last letter indicates tissue type - **CUMM_DIAM** — numeric(0.100000), range 0.0000 290.0000, millimeters Outer diameter of each tissue type within a sample - **LONGITUDE** — numeric(0.100000), range 0.0000 480.0000, millimeters Longitudinal length of sample - **PROPORTION** — numeric(0.100000), range 0.0000 1.0000, number Proportion of ideal volume that the tissue type represents - **IDEAL_VOL** — numeric(0.010000), range 1.0300 5813.7100, cubic centimeters Volume based on outer diameter for enitre woody root - **TRUE_VOL** — numeric(0.010000), range -796.1900 3534.8201, cubic centimeters Volume of individual tissue type within woody root - **WET_WT** — numeric(0.010000), range 0.0000 2683.0000, grams Field wet weight of sample - **DRY_WT** — numeric(0.010000), range 0.0000 1157.7000, grams Final oven dry weight - **MOISTURE** — numeric(0.010000), range -44.4400 4676.7002, percent Percent moisture - **DENSITY** — numeric(0.001000), range 0.0000 7.8640, grams per cubic centimeter Density of sample ## Entity 2: TD03202 ### Attribute list - **DBCODE** — varchar, enum FSDB database code - **TD032** — FSDB database code TD032 - **ENTITY** — numeric(1.000000), range 2.0000 2.0000, number Entity number - **SITE** — varchar, enum Site where woody root was collected - **HJA** — H.j. andrews experimental forest oregon, pre-1996 - **WRE** — Wind river experimental forest - **PRF** — Pringle falls experimental forest - **CAH** — Cascade head experimental forest - **SAMP_NUM** — varchar, freetext Unique number for individual sample, last letter indicates tissue type - **SPECIES** — varchar, enum Species of woody root sample - **PISI** — Picea sitchensis - **PICO** — Pinus contorta - **PIPO** — Pinus ponderosa - **PSME** — Pseudotsuga menziesii - **TSHE** — Tsuga heterophylla - **TYPE** — varchar, enum Woody root tissue type - **S** — Sapwood - **H** — Heartwood - **R** — Resin core - **B** — Bark - **ASH** — numeric(0.010000), range -1.0300 93.8100, percent Percent of sample composed of ash - **NITROGEN** — numeric(0.010000), range 0.0100 1.5400, percent Percent of sample composed of nitrogen - **LABEL** — numeric(1.000000), range 1.0000 1401.0000, number Number assigned by lab - **CUMM_DIAM** — numeric(0.100000), range 4.6000 290.0000, millimeters Outer diameter of each tissue type within a sample - **AF_DENSITY** — numeric(0.001000), range 0.0000 3.7290, grams per cubic centimeter Ash-free density ## Attribute Definitions **AF_DENSITY** Ash-free density **ASH** Percent of sample composed of ash **CUMM_DIAM** Outer diameter of each tissue type within a sample **DBCODE** FSDB database code **DECAY_AGE** Amount of years passed since death of tree **DENSITY** Density of sample **DRY_WT** Final oven dry weight **ENTITY** Entity number **IDEAL_VOL** Volume based on outer diameter for enitre woody root **LABEL** Number assigned by lab **LONGITUDE** Longitudinal length of sample **MOISTURE** Percent moisture **NITROGEN** Percent of sample composed of nitrogen **PROPORTION** Proportion of ideal volume that the tissue type represents **SAMP_NUM** Unique number for individual sample, last letter indicates tissue type **SITE** Site where woody root was collected **SPECIES** Species of woody root sample **STAND** Name of forest stand, sometimes reflects year cut **TRUE_VOL** Volume of individual tissue type within woody root **TYPE** Woody root tissue type **WET_WT** Field wet weight of sample ## Enumerated Domains ### DBCODE - **TD032** — FSDB database code TD032 ### SITE - **HJA** — H.j. andrews experimental forest oregon, pre-1996 - **WRE** — Wind river experimental forest - **PRF** — Pringle falls experimental forest - **CAH** — Cascade head experimental forest ### SPECIES - **PISI** — Picea sitchensis - **PICO** — Pinus contorta - **PIPO** — Pinus ponderosa - **PSME** — Pseudotsuga menziesii - **TSHE** — Tsuga heterophylla ### TYPE - **S** — Sapwood - **H** — Heartwood - **R** — Resin core - **B** — Bark