TP001
Permanent Sample Plot (PSP) data - common data for Permanent vegetation plots in the Pacific Northwest (TV010), Watershed 2 and Hagan (TP091), Watersheds 6 and 7 (TP114) and Watersheds 8 and 9 (TP115)

CREATOR(S): Mark E. Harmon, Suzanne M. Remillard

PRINCIPAL INVESTIGATOR(S): David Bell

ORIGINATOR(S): Donald L. Henshaw

OTHER RESEARCHER(S): Suzanne M. Remillard, Andrew Bluhm

FORMER INVESTIGATOR: Mark E. Harmon, Robert J. Pabst

METADATA CREATION DATE:

7 Dec 2011

MOST RECENT METADATA REVIEW DATE:

21 Jun 2023

PURPOSE:

Each individual study has its own purpose, but the overall purpose is to provides baseline information on long-term rates of tree growth and tree regeneration (ingrowth), causes and characteristics of tree mortality, forest productivity and biomass, and spatial patterns (demography) of ingrowth and mortality.

METHODS:

Experimental Design - TP001:

Description: Common data structures were developed to manage tree growth and mortality data from permanent reference stands and HJ Andrews watershed vegetation plots. Every tree is assigned a unique tree id. Data are collected either on paper datasheets or electronically and uploaded using a suite of QA/QC programs and processes to entities in this database. Views of the data for the individual study databases are made available within those database study webpages.

Field Methods - TP001:

Description: Field methods for the individual studies are found within the study abstract webpages for those studies.

Processing Procedures - TP001:

Description: Data are uploaded by individual stand using an in-house FoxPro program called newrem. The program downloads previous measurement data for the stand and adds the new data to it. Various QA/QC processes are run to ensure integrity of each tree measured. In addition to generic checks (illegal null values, range, enumerated domains, duplicates, and place keyword), specific checks are made on shrinking trees and missing dbh, excess growth, large ingrowth, missing dbh in remeasurement, tag sequences, tags for dead trees in live file are listed in mortality file, species correspondence between live and dead tree file, tags not found between the master, live, and mortality file, and live and dead tree code checks.

SUPPLEMENTAL INFORMATION:

The HJ Andrews Experimental Forest Watershed plot data in Watershed 10 (TP041) and Watersheds 1 and 3 (TP073) have data structures that do not easily accommodate this common structure. These data have not yet been incorporated into TP001.

TAXONOMIC SYSTEM:

USDA Plants Database

GEOGRAPHIC EXTENT:

Pacific Northwest Forests and some western forests examine long-term trends and dynamics of representative forest types in the Pacific Northwest.

MEASUREMENT FREQUENCY:

1- to 6-yr intervals

PROGRESS DESCRIPTION:

Active

UPDATE FREQUENCY DESCRIPTION:

annually

CURRENTNESS REFERENCE:

Ground condition