# The relationship between early succession rates and soil properties in the Andrews Experimental Forest, 1999-2000 ## Dataset - **Database Code:** SP012 - **Title:** The relationship between early succession rates and soil properties in the Andrews Experimental Forest, 1999-2000 - **Abstract:** This study represents only one portion of a much larger study involving a wide range of disciplines and several H.J. Andrews Forest researchers. This dataset represents all the soils data collected up through the summer of 1999. In addition, Steve Acker conducted surveys of vegetation and measuring tree growth using cores. Mark Harmon has conducted a survey of coarse woody debris. Future studies could include hydrology and species diversity. When we compared the soil characteristics between slow and expected recovery sites, the only variables showing significant differences were soil moisture, litter depth and substrate induced respiration (SIR) rates at low glucose concentrations. The litter depth was slightly less, soil moisture lower, and SIR rates higher in the slow sites. When we compared soils in adjacent uncut forests, we found that field respiration rates were lower in forests adjacent to slow recovery sites than to normal sites suggesting that these sites may have inherently lower productivities. We concluded that slow recovery after clear-cutting is most likely related to physical site characteristics; i.e. steepness of slope and aspect. There did not appear to be any difference in soil depth. - **Keywords:** succession; primary production; recovery; inorganic nutrients; soil; forests; Long-Term Ecological Research (LTER); primary production; inorganic nutrients - **Temporal coverage:** 1999-06-06 to 2000-07-07 - **Principal Investigator:** Robert P. Griffiths ## Data Entities 1. SP01201 ## Entity 1: SP01201 ### Attribute list - **DBCODE** — varchar, enum Database code - **SP012** — FSDB dataset code SP012 - **ENTITY** — numeric(1.000000), range 1.0000 1.0000, number Entity number - **SITE** — numeric(1.000000), range 207.0000 739.0000, number Site designator used for all segments of this study - **TREATSET** — numeric(1.000000), range 1.0000 6.0000, number Treatment set pairing expected sites with slow sites - **TREATMENT** — varchar, enum Treatments: controls were adjacent oldgrowth controls; exper were the experimental plots - **control** — Control treatment in adjacent old-growth forest - **exper** — Experimental plot treatment - **CCRATE** — varchar, enum Rate of recovery (canopy closure) - **slow** — slow canopy closure 40 years post-harvest - **expected** — normal or expected rates of canopy closure - **ELEVATION** — varchar, enum High and low elevation sites (explicit) - **low** — low elevation site - **high** — high elevation site - **HYSTER** — numeric(1.000000), range 0.0000 100.0000, percent Percentage of core containing mycorrhizal mats like those of the genus Hysterangium - **GAUT** — numeric(1.000000), range 0.0000 100.0000, percent Percentage of core containing mycorrhizal mats like those of the genus Gautieria - **DEPTH** — numeric(0.100000), range 25.0000 70.0000, centimeters Soil depth - **COEFVAR** — numeric(0.100000), range 30.0000 70.0000, percent Coefficient of variability for soil depth measurements - **LITTER** — numeric(1.000000), range 0.0000 10.0000, centimeters Litter depth - **BULKDENS** — numeric(0.001000), range 0.1260 1.1360, grams per cubic centimeter Bulkdensity - **MOIST** — numeric(0.100000), range 0.0000 110.0000, percent Percent moisture - **SOILTEMP** — numeric(0.100000), range 9.0000 20.0000, degrees Celsius Soil temperature measured with LiCor - **LIGHT** — numeric(0.100000), range 0.0000 500.0000, micromoles per square meter per second Amount of light measured with LiCor - **SOM** — numeric(0.010000), range 10.0000 40.0000, percent Soil organic matter - **PH** — numeric(0.010000), range 4.0000 6.0000, pH units pH - **EXAMM** — numeric(0.010000), range 0.0000 1.0000, micromoles per gram per day Extractable ammonium - **MINN** — numeric(0.010000), range 0.0000 10.0000, micromoles per gram per day Mineralizable nitrogen - **DENIT** — numeric(0.100000), range 0.0000 10.0000, nanograms per gram per hour Denitrification potential (as N) - **B_GLUC** — numeric(0.001000), range 0.0000 1.0000, micromoles per gram per hour Beta-glucosidase activity - **LTR** — numeric(0.100000), range 0.0000 40.0000, micrograms per gram per week Long-term laboratory respiration; one week (as C) - **LABRESP** — numeric(0.010000), range 0.0000 5.0000, micrograms per gram per hour Laboratory respiration rates; two h (as C) - **FLDRESP** — numeric(0.010000), range 0.0000 30.0000, grams per square meter per day Field respiration rates - **SIR_1NM** — numeric(0.001000), range 0.0000 1.0000, micrograms per gram per hour Substrate-induced respiration with 1 nM glucose added (as C) - **SIR_1M** — numeric(0.001000), range 0.0000 2.0000, micrograms per gram per hour Substrate-induced respiration with 1 M glucose added (as C) ## Attribute Definitions **BULKDENS** Bulkdensity **B_GLUC** Beta-glucosidase activity **CCRATE** Rate of recovery (canopy closure) **COEFVAR** Coefficient of variability for soil depth measurements **DBCODE** Database code **DENIT** Denitrification potential (as N) **DEPTH** Soil depth **ELEVATION** High and low elevation sites (explicit) **ENTITY** Entity number **EXAMM** Extractable ammonium **FLDRESP** Field respiration rates **GAUT** Percentage of core containing mycorrhizal mats like those of the genus Gautieria **HYSTER** Percentage of core containing mycorrhizal mats like those of the genus Hysterangium **LABRESP** Laboratory respiration rates; two h (as C) **LIGHT** Amount of light measured with LiCor **LITTER** Litter depth **LTR** Long-term laboratory respiration; one week (as C) **MINN** Mineralizable nitrogen **MOIST** Percent moisture **PH** pH **SIR_1M** Substrate-induced respiration with 1 M glucose added (as C) **SIR_1NM** Substrate-induced respiration with 1 nM glucose added (as C) **SITE** Site designator used for all segments of this study **SOILTEMP** Soil temperature measured with LiCor **SOM** Soil organic matter **TREATMENT** Treatments: controls were adjacent oldgrowth controls; exper were the experimental plots **TREATSET** Treatment set pairing expected sites with slow sites ## Enumerated Domains ### DBCODE - **SP012** — FSDB dataset code SP012 ### TREATMENT - **control** — Control treatment in adjacent old-growth forest - **exper** — Experimental plot treatment ### CCRATE - **slow** — slow canopy closure 40 years post-harvest - **expected** — normal or expected rates of canopy closure ### ELEVATION - **low** — low elevation site - **high** — high elevation site