# Effect of thinning pole stands on soil processes in southern Oregon, central Coast Range, and central western Cascades of Oregon (1994-1995 BLM Study) ## Dataset - **Database Code:** SP008 - **Title:** Effect of thinning pole stands on soil processes in southern Oregon, central Coast Range, and central western Cascades of Oregon (1994-1995 BLM Study) - **Abstract:** This study was conducted in different regions to determine if climatic regimes alter the effects of thinning pole stands. Forest managers are currently faced with increasingly complex demands in designing sulvicultural approaches that fulfill the need to maintain and in some cases, enhance forest health. As mature and old-growth forests with their high degree of structural heterogeneity are replaced by younger plantations with much simpler structure, there is concern that key habitat components are being lost for a number of plants and animals. A silviculture technique that could be used to increase the structural complexity of young stands to thin them; encouraging the development of higher structural complexity. The main purposes of this study is to determine how thinning pole stands influence below-ground processes. The central research question was whether or not this manipulation brings soil characteristics closer to those found in old-growth forests; in essence, accelerating the onset of old-growth-like characteristics via forest management. - **Keywords:** soil chemistry; soil respiration; respiration; disturbance; inorganic nutrients; organic matter; soil organic matter; forests; Long-Term Ecological Research (LTER); conifers; disturbance; inorganic nutrients; organic matter - **Temporal coverage:** 1994-01-01 to 1996-01-01 - **Principal Investigator:** Robert P. Griffiths ## Data Entities 1. SP00801 ## Entity 1: SP00801 ### Attribute list - **STCODE** — varchar, enum FSDB Database Study code - **SP008** — FSDB Database Study code SP008 - **FORMAT** — numeric(1.000000), range 1.0000 1.0000, number Format number - **REGION** — varchar, enum Region - **CA** — Cascades - **CO** — Coastal - **SO** — Southern oregon - **TREAT** — varchar, enum Treatment type - **OG** — Oldgrowth - **P** — Pole stand - **T** — Thinned pole stand - **TRIAD** — numeric(1), range 1.0000 3.0000, number Triad number - **LOCAT** — varchar, freetext Position along transect where sample is taken, 1 = start of transect - **DISTANCE** — numeric(1.000000), range 0.0000 245.0000, meters Distance in meters from beginning of transect - **HEADSP** — numeric(0.001000), range 0.0070 0.3720, percent Concentration of CO2 in chamber at end of incubation time - **TOTALCO2** — numeric(0.001000), range -0.4400 4.3340, grams per square meter per day Amount of CO2 released from forest floor per sq. meter per day - **LABRESP** — numeric(0.001000), range -0.0690 3.5600, micromoles per gram per hour Co2 released from soils incubated at 15 deg C with no amendments (dry weight basis) - **H2ORESP** — numeric(0.001000), range -1.1440 2.7030, micromoles per gram per hour CO2 released from soils incubated at 15 deg C amended with water (dry weight basis) - **SIR** — numeric(0.001000), range -1.8280 4.0130, micromoles per gram per hour CO2 released from soils incubated at 15 deg C amended with 1 um glucose (dry weight basis) - **LITTER** — numeric(0.001000), range 0.0000 190.0000, centimeters Letter depth - **SOILTEMP** — numeric(0.001000), range 6.0000 19.5000, degrees Celsius Soil temperature - **BULKDENSIT** — numeric(0.001000), range 0.0000 1.3390, grams per gram Bulk density - **PH** — numeric(0.001000), range 3.7300 7.5900, pH units pH - **FDW** — numeric(0.001000), range 0.1480 0.9930, number Wt fraction dry/wet wt soil - **PERMOI** — numeric(0.010000), range 0.7000 575.6800, percent Percent moisture (wet-dry/dry)x100 - **SOM** — numeric(0.010000), range 5.2400 95.4300, percent Percent soil organic matter in mineral soil (by compustion at 550 c) - **EXTRAMM** — numeric(0.001000), range 0.0000 30.3200, micrograms per gram Concentration of ammoniom extracted with 2m KCl (dry weight basis) - **MIN_N** — numeric(0.100000), range 1.4000 451.1000, micrograms per gram Cencentration ammoniom after incubaton at 40 deg C for 7 days (dry weight basis) - **DOC** — numeric(0.100000), range 0.0000 15.2000, micrograms per gram Dissolved organic carbon extracted from soils (dry weight basis) - **DENI** — numeric(0.001000), range -2.5700 61.6400, nanomoles per gram per hour Denitrification potential on a dry weight basis ## Attribute Definitions **BULKDENSIT** Bulk density **DENI** Denitrification potential on a dry weight basis **DISTANCE** Distance in meters from beginning of transect **DOC** Dissolved organic carbon extracted from soils (dry weight basis) **EXTRAMM** Concentration of ammoniom extracted with 2m KCl (dry weight basis) **FDW** Wt fraction dry/wet wt soil **FORMAT** Format number **H2ORESP** CO2 released from soils incubated at 15 deg C amended with water (dry weight basis) **HEADSP** Concentration of CO2 in chamber at end of incubation time **LABRESP** Co2 released from soils incubated at 15 deg C with no amendments (dry weight basis) **LITTER** Letter depth **LOCAT** Position along transect where sample is taken, 1 = start of transect **MIN_N** Cencentration ammoniom after incubaton at 40 deg C for 7 days (dry weight basis) **PERMOI** Percent moisture (wet-dry/dry)x100 **PH** pH **REGION** Region **SIR** CO2 released from soils incubated at 15 deg C amended with 1 um glucose (dry weight basis) **SOILTEMP** Soil temperature **SOM** Percent soil organic matter in mineral soil (by compustion at 550 c) **STCODE** FSDB Database Study code **TOTALCO2** Amount of CO2 released from forest floor per sq. meter per day **TREAT** Treatment type **TRIAD** Triad number ## Enumerated Domains ### STCODE - **SP008** — FSDB Database Study code SP008 ### REGION - **CA** — Cascades - **CO** — Coastal - **SO** — Southern oregon ### TREAT - **OG** — Oldgrowth - **P** — Pole stand - **T** — Thinned pole stand