# Disturbance effects on soil processes in the Andrews Experimental Forest (1995 Stand Age Study) ## Dataset - **Database Code:** SP007 - **Title:** Disturbance effects on soil processes in the Andrews Experimental Forest (1995 Stand Age Study) - **Abstract:** This study was designed to determine how edges generated by clear-cutting old-growth forests influence patterns of soil carbon and nitrogen cycling and the distribution of ectomycorrhizal mats and to determine how these patterns change with time after harvest. A secondary objective was to measure how clear-cutting within different climatic regimes influenced soil nitrogen and carbon cycling. - **Keywords:** community structure; meteorology; soil chemistry; tree age; carbon cycling; disturbance; inorganic nutrients; carbon; Long-Term Ecological Research (LTER); disturbance; inorganic nutrients - **Temporal coverage:** 1995-01-01 to 1995-12-01 - **Principal Investigator:** Robert P. Griffiths ## Data Entities 1. SP00701 ## Entity 1: SP00701 ### Attribute list - **STCODE** — varchar, enum FSDB Database Study code - **SP007** — FSDB Database Study Code SP007 - **FORMAT** — numeric(1.000000), range 1.0000 1.0000, number Format number - **TRANS** — numeric(1), range 1.0000 28.0000, number Transect number - **TRIAD** — numeric(1), range 1.0000 9.0000, number Triad number for set of three harvest stand age classes - **ASP** — varchar, enum Elevation/aspect code of site - **LOW** — Low elevation site - **NORTH** — High elevation site facing north - **SOUTH** — High elevation site facing south - **TREAT** — varchar, enum Treatment of stand (uncut or harvested) - **15** — Fifteen year old stand - **40** — Forty year old stand - **5** — Five year old stand - **OG** — Oldgrowth - **EDGDIST** — numeric(1), range 0.0000 75.0000, meters Distance from edge in meters - **POS** — numeric(1), range 0.0000 150.0000, meters Position along transect from ends of transect - **MOIST** — numeric(1.000000), range 7.0000 513.0000, percent Percent moisture (wet-dry/dry)x100 - **HIST** — numeric(1.000000), range 0.0000 100.0000, percent Percent of core containing Hysterangium-like ectomycorrhizal mats - **GUAT** — numeric(1.000000), range 0.0000 100.0000, percent Percent of core containing Gautieria-like ectomycorrhizal mats - **MAT** — numeric(0.100000), range 0.1000 180.1000, percent Percent of core containing all ectomycorrhizal mats - **SOIL** — numeric(0.100000), range 9.2000 28.2000, degrees Celsius Soil temperature at 10 cm from surface - **PH** — numeric(0.010000), range 2.2600 6.4500, pH units pH value - **SOM** — numeric(0.100000), range 7.8000 154.7000, percent Percent soil organic matter in mineral soil (by combustion at 550 C) - **LITTER** — numeric(1.000000), range 0.0000 30.0000, centimeters Litter depth - **AIR** — numeric(0.100000), range 0.0000 19.5000, degrees Celsius Air temperature taken at the time of field respiration measurement - **LIGHT** — numeric(1.000000), range 0.0000 879.0000, number Light intensity at time of field respiration - **RESP** — numeric(0.010000), range 0.0000 53.3000, grams per square meter per day Rate of forest floor respiration without litter layer ( as C) - **LTR** — numeric(0.000000), range 0.0000 12.8200, micrograms per gram Long-term lab soil respiration rate; co2 in headspace after 14 days (dry wt basis) - **DENIT** — numeric(0.010000), range 0.0000 242.4300, micrograms per gram per hour Denitrification potential (as N, dry wt basis) - **MIN_N** — numeric(0.001000), range 0.0000 1652.8000, micrograms per gram Mineralizable organic nitrogen; anaerobic incubation for 14 days at 40c (N , dry wt basis) - **EXTR_AMM** — numeric(0.001000), range 0.0000 88.0000, micrograms per gram Concentration of ammonium with 2m KCl (as n, dry wt basis) ## Attribute Definitions **AIR** Air temperature taken at the time of field respiration measurement **ASP** Elevation/aspect code of site **DENIT** Denitrification potential (as N, dry wt basis) **EDGDIST** Distance from edge in meters **EXTR_AMM** Concentration of ammonium with 2m KCl (as n, dry wt basis) **FORMAT** Format number **GUAT** Percent of core containing Gautieria-like ectomycorrhizal mats **HIST** Percent of core containing Hysterangium-like ectomycorrhizal mats **LIGHT** Light intensity at time of field respiration **LITTER** Litter depth **LTR** Long-term lab soil respiration rate; co2 in headspace after 14 days (dry wt basis) **MAT** Percent of core containing all ectomycorrhizal mats **MIN_N** Mineralizable organic nitrogen; anaerobic incubation for 14 days at 40c (N , dry wt basis) **MOIST** Percent moisture (wet-dry/dry)x100 **PH** pH value **POS** Position along transect from ends of transect **RESP** Rate of forest floor respiration without litter layer ( as C) **SOIL** Soil temperature at 10 cm from surface **SOM** Percent soil organic matter in mineral soil (by combustion at 550 C) **STCODE** FSDB Database Study code **TRANS** Transect number **TREAT** Treatment of stand (uncut or harvested) **TRIAD** Triad number for set of three harvest stand age classes ## Enumerated Domains ### STCODE - **SP007** — FSDB Database Study Code SP007 ### ASP - **LOW** — Low elevation site - **NORTH** — High elevation site facing north - **SOUTH** — High elevation site facing south ### TREAT - **15** — Fifteen year old stand - **40** — Forty year old stand - **5** — Five year old stand - **OG** — Oldgrowth