TD032 – Simplified metadata | Andrews Forest Research Program

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
Date begin: 1995-06-01
Date end: 1997-06-01
Principal Investigator: Mark E. Harmon

TD03201 - attributes
Attribute	Type	Domain	Minimum	Maximum	Unit
DBCODE	varchar	enum
ENTITY	numeric(1.000000)	range	1.0000	1.0000	number
SITE	varchar	enum
STAND	varchar	freetext
DECAY_AGE	numeric(1.000000)	range	0.0000	50.0000	number of years
SPECIES	varchar	enum
SAMP_NUM	varchar	freetext
CUMM_DIAM	numeric(0.100000)	range	0.0000	290.0000	millimeters
LONGITUDE	numeric(0.100000)	range	0.0000	480.0000	millimeters
PROPORTION	numeric(0.100000)	range	0.0000	1.0000	number
IDEAL_VOL	numeric(0.010000)	range	1.0300	5813.7100	cubic centimeters
TRUE_VOL	numeric(0.010000)	range	-796.1900	3534.8201	cubic centimeters
WET_WT	numeric(0.010000)	range	0.0000	2683.0000	grams
DRY_WT	numeric(0.010000)	range	0.0000	1157.7000	grams
MOISTURE	numeric(0.010000)	range	-44.4400	4676.7002	percent
DENSITY	numeric(0.001000)	range	0.0000	7.8640	grams per cubic centimeter

TD03202 - attributes
Attribute	Type	Domain	Minimum	Maximum	Unit
DBCODE	varchar	enum
ENTITY	numeric(1.000000)	range	2.0000	2.0000	number
SITE	varchar	enum
SAMP_NUM	varchar	freetext
SPECIES	varchar	enum
TYPE	varchar	enum
ASH	numeric(0.010000)	range	-1.0300	93.8100	percent
NITROGEN	numeric(0.010000)	range	0.0100	1.5400	percent
LABEL	numeric(1.000000)	range	1.0000	1401.0000	number
CUMM_DIAM	numeric(0.100000)	range	4.6000	290.0000	millimeters
AF_DENSITY	numeric(0.001000)	range	0.0000	3.7290	grams per cubic centimeter

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

Codes for DBCODE
Code	Description
TD032	FSDB database code TD032

Codes for SITE
Code	Description
HJA	H.j. andrews experimental forest oregon, pre-1996
WRE	Wind river experimental forest
PRF	Pringle falls experimental forest
CAH	Cascade head experimental forest