Long-term yellow pine (ponderosa pine and Jeffrey pine) growth and yield study plots at multiple sites in northern California

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Finley, Kaelyn A.
Originator: Zhang, Jianwei
Publication_Date: 2024
Title:
Long-term yellow pine (ponderosa pine and Jeffrey pine) growth and yield study plots at multiple sites in northern California
Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:
Publication_Place: Fort Collins, CO
Publisher: Forest Service Research Data Archive
Online_Linkage: https://doi.org/10.2737/RDS-2024-0064
Description:
Abstract:
This data publication contains tabular growth and yield data collected on multiple long-term yellow pine (ponderosa pine and Jeffrey pine) study plots established on 13 sites in northern California. These sites include: Adin Pass, Antelope Mountain, Blacks Mountains Experimental Forest, Edson Creek, Hog Lake, Jelly Camp, Joseph Creek, KC Reservoir, Prattville, Show plantation, Spaulding Butte, Sugar Hill, and Washington Mountain. Sites were established anywhere from 1944 to 1972, and data collected approximately every 5 years, resulting in data ranging from 1944 to 2022. Measurements consistently include tree diameter at breast height (DBH at 4.5 feet), stand age, and tree conditions. Total tree height and height to live crown were measured on a small subset of trees.
Purpose:
The purposes of these plots were for either predicting stand growth and yield, silvicultural treatments such as thinning and pruning, stand density management, or resilience to disturbances of yellow pine plantations and natural stands. These sites have also been used as demonstration pieces for managing forest stands.
Supplemental_Information:
For more information about this study and these data, see Oliver (1972), Oliver and Powers (1978), and Zhang et al. (2013). Other associated articles are listed as cross-references below.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1944
Ending_Date: 2022
Currentness_Reference:
Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Description_of_Geographic_Extent:
Study plots were established on 13 sites in northern California.
Bounding_Coordinates:
West_Bounding_Coordinate: -122.28220
East_Bounding_Coordinate: -120.30840
North_Bounding_Coordinate: 41.83410
South_Bounding_Coordinate: 40.19560
Bounding_Altitudes:
Altitude_Minimum: 3910
Altitude_Maximum: 6260
Altitude_Distance_Units: feet
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: biota
Theme:
Theme_Keyword_Thesaurus: National Research & Development Taxonomy
Theme_Keyword: Ecology, Ecosystems, & Environment
Theme_Keyword: Inventory, Monitoring, & Analysis
Theme_Keyword: Monitoring
Theme_Keyword: Resource inventory
Theme_Keyword: Natural Resource Management & Use
Theme_Keyword: Timber
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: long-term silvicultural research plots
Theme_Keyword: stand density
Theme_Keyword: timber production
Theme_Keyword: yellow pine
Theme_Keyword: ponderosa pine
Theme_Keyword: Jeffrey pine
Theme_Keyword: growth and yield
Theme_Keyword: resilience to disturbance
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Blacks Mountain Experimental Forest
Place_Keyword: California
Place_Keyword: Lassen National Forest
Place_Keyword: Modoc National Forest
Place_Keyword: Shasta-Trinity National Forest
Taxonomy:
Keywords/Taxon:
Taxonomic_Keyword_Thesaurus:
None
Taxonomic_Keywords: multiple species
Taxonomic_Keywords: plants
Taxonomic_Keywords: trees
Taxonomic_Keywords: vegetation
Taxonomic_Keywords: yellow pine
Taxonomic_Keywords: pinus jeffreyi
Taxonomic_Keywords: Jeffrey pine
Taxonomic_Keywords: pinus ponderosa
Taxonomic_Keywords: ponderosa pine
Taxonomic_Keywords: Abies concolor
Taxonomic_Keywords: white fir
Taxonomic_Keywords: Calocedrus decurrens
Taxonomic_Keywords: incense cedar
Taxonomic_Keywords: Pinus lambertiana
Taxonomic_Keywords: sugar pine
Taxonomic_Keywords: Juniperus occidentalis
Taxonomic_Keywords: western juniper
Taxonomic_Keywords: Pinus contorta
Taxonomic_Keywords: lodgepole pine
Taxonomic_System:
Classification_System/Authority:
Classification_System_Citation:
Citation_Information:
Originator: ITIS
Publication_Date: 2024
Title:
Integrated Taxonomic Information System
Geospatial_Data_Presentation_Form: on-line database
Other_Citation_Details:
Retrieved [June, 4, 2024]; CC0: https://creativecommons.org/publicdomain/zero/1.0/legalcode
Online_Linkage: https://www.itis.gov
Online_Linkage: https://doi.org/10.5066/F7KH0KBK
Taxonomic_Procedures:
Taxonomic_Classification:
Taxon_Rank_Name: Kingdom
Taxon_Rank_Value: Plantae
Applicable_Common_Name: plantes
Applicable_Common_Name: Planta
Applicable_Common_Name: Vegetal
Applicable_Common_Name: plants
Taxonomic_Classification:
Taxon_Rank_Name: Subkingdom
Taxon_Rank_Value: Viridiplantae
Applicable_Common_Name: green plants
Taxonomic_Classification:
Taxon_Rank_Name: Infrakingdom
Taxon_Rank_Value: Streptophyta
Applicable_Common_Name: land plants
Taxonomic_Classification:
Taxon_Rank_Name: Superdivision
Taxon_Rank_Value: Embryophyta
Taxonomic_Classification:
Taxon_Rank_Name: Division
Taxon_Rank_Value: Tracheophyta
Applicable_Common_Name: vascular plants
Applicable_Common_Name: tracheophytes
Taxonomic_Classification:
Taxon_Rank_Name: Subdivision
Taxon_Rank_Value: Spermatophytina
Applicable_Common_Name: spermatophytes
Applicable_Common_Name: seed plants
Applicable_Common_Name: phanérogames
Taxonomic_Classification:
Taxon_Rank_Name: Class
Taxon_Rank_Value: Pinopsida
Applicable_Common_Name: conifers
Taxonomic_Classification:
Taxon_Rank_Name: Subclass
Taxon_Rank_Value: Pinidae
Taxonomic_Classification:
Taxon_Rank_Name: Order
Taxon_Rank_Value: Pinales
Applicable_Common_Name: pines
Taxonomic_Classification:
Taxon_Rank_Name: Family
Taxon_Rank_Value: Pinaceae
Applicable_Common_Name: pines
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Abies
Applicable_Common_Name: fir
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Abies concolor
Applicable_Common_Name: balsam fir
Applicable_Common_Name: silver fir
Applicable_Common_Name: Colorado fir
Applicable_Common_Name: concolor fir
Applicable_Common_Name: white balsam
Applicable_Common_Name: oyamel de California
Applicable_Common_Name: white fir
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Pinus
Applicable_Common_Name: pine
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Pinus contorta
Applicable_Common_Name: lodgepole pine
Applicable_Common_Name: scrub pine
Applicable_Common_Name: shore pine
Applicable_Common_Name: tamarack pine
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Pinus jeffreyi
Applicable_Common_Name: Jeffrey's pine
Applicable_Common_Name: black pine
Applicable_Common_Name: pino negro
Applicable_Common_Name: Jeffrey pine
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Pinus lambertiana
Applicable_Common_Name: sugar pine
Applicable_Common_Name: California sugar pine
Applicable_Common_Name: pino de azúcar
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Pinus ponderosa
Applicable_Common_Name: ponderosa pine
Applicable_Common_Name: bull pine
Applicable_Common_Name: western yellow pine
Applicable_Common_Name: blackjack pine
Applicable_Common_Name: pinabete
Applicable_Common_Name: rock pine
Taxonomic_Classification:
Taxon_Rank_Name: Family
Taxon_Rank_Value: Cupressaceae
Applicable_Common_Name: cypress
Applicable_Common_Name: redwood
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Juniperus
Applicable_Common_Name: juniper
Applicable_Common_Name: cedar
Applicable_Common_Name: cedro
Applicable_Common_Name: redcedar
Applicable_Common_Name: sabino
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Juniperus occidentalis
Applicable_Common_Name: western juniper
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Calocedrus
Applicable_Common_Name: incense cedar
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Calocedrus decurrens
Applicable_Common_Name: incense cedar
Applicable_Common_Name: incense-cedar
Access_Constraints: None
Use_Constraints:
These data were collected using funding from the U.S. Government and can be used without additional permissions or fees. If you use these data in a publication, presentation, or other research product please use the following citation:

Finley, Kaelyn A.; Zhang, Jianwei. 2024. Long-term yellow pine (ponderosa pine and Jeffrey pine) growth and yield study plots at multiple sites in northern California. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2024-0064
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kaelyn Finley
Contact_Organization: USDA Forest Service, Pacific Southwest Research Station
Contact_Position: Forester
Contact_Address:
Address_Type: mailing and physical
Address: 3644 Avtech Parkway
City: Redding
State_or_Province: CA
Postal_Code: 96002
Country: USA
Contact_Voice_Telephone: 530-226-2552
Contact_Electronic_Mail_Address: kaelyn.a.finley@usda.gov
Contact Instructions: This contact information was current as of original publication date. For current information see Contact Us page on: https://doi.org/10.2737/RDS.
Browse_Graphic:
Browse_Graphic_File_Name: \Supplements\All_Site_Locations_CA.jpg
Browse_Graphic_File_Description:
Topographic map of California and all 13 site locations.
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: \Supplements\All_StudySites.jpg
Browse_Graphic_File_Description:
Zoomed in topographic map of California and all 13 site locations.
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Funding for these data was provided by the USDA Forest Service, Pacific Southwest Research Station (PSW).


Author Information:

Kaelyn A. Finley
USDA Forest Service, Pacific Southwest Research Station
https://orcid.org/0009-0003-8657-272X

Jianwei Zhang
USDA Forest Service, Pacific Southwest Research Station
https://orcid.org/0000-0003-3492-2356
Cross_Reference:
Citation_Information:
Originator: Jang, Woongsoon
Originator: Ritchie, Martin W.
Originator: Zhang, Jianwei
Publication_Date: 2020
Title:
Improved equations for the density management diagram isolines of ponderosa pine stands
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Forest Science
Issue_Identification: 67(1): 93-102
Online_Linkage: https://doi.org/10.1093/forsci/fxaa034
Online_Linkage: https://research.fs.usda.gov/treesearch/62064
Cross_Reference:
Citation_Information:
Originator: Oliver, William W.
Publication_Date: 1972
Title:
Growth after thinning ponderosa and Jeffrey pine pole stands in northeastern California
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Research Paper
Issue_Identification: PSW-RP-85
Publication_Information:
Publication_Place: Berkeley, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Other_Citation_Details:
8 p.
Online_Linkage: https://research.fs.usda.gov/treesearch/28749
Cross_Reference:
Citation_Information:
Originator: Oliver, William W.
Originator: Powers, Robert F.
Publication_Date: 1978
Title:
Growth models for ponderosa pine: I. Yield of unthinned plantations in northern California
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Research Paper
Issue_Identification: PSW-RP-133
Publication_Information:
Publication_Place: Berkeley, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Other_Citation_Details:
21 p.
Online_Linkage: https://research.fs.usda.gov/treesearch/30602
Cross_Reference:
Citation_Information:
Originator: Oliver, William W.
Publication_Date: 1979
Title:
Fifteen-year growth patterns after thinning a ponderosa-Jeffrey pine plantation in northeastern California
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Research Paper
Issue_Identification: PSW-RP-141
Publication_Information:
Publication_Place: Berkeley, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Other_Citation_Details:
10 p.
Online_Linkage: https://research.fs.usda.gov/treesearch/29579
Cross_Reference:
Citation_Information:
Originator: Oliver, William W.
Originator: Trask, John
Publication_Date: 1983
Title:
Responses of eastside pine to precommercial thinning
Geospatial_Data_Presentation_Form: conference proceedings
Other_Citation_Details:
pp. 107-113
Online_Linkage: https://www.fs.usda.gov/psw/publications/oliver/psw_1982_oliver001.pdf
Larger_Work_Citation:
Citation_Information:
Originator: Unknown
Publication_Date: 1983
Title:
Proceedings, Symposium on management of the eastside pine type in northeastern California
Geospatial_Data_Presentation_Form: conference proceedings
Publication_Information:
Publication_Place: Reno, NV
Publisher: Cooperative Extension, University of California and Northern California Society of American Foresters
Cross_Reference:
Citation_Information:
Originator: Oliver, William W.
Publication_Date: 1995
Title:
Is self-thinning in ponderosa pine ruled by Dendroctonus bark beetles?
Geospatial_Data_Presentation_Form: conference proceedings
Other_Citation_Details:
pp. 213-218
Online_Linkage: https://research.fs.usda.gov/treesearch/23504
Larger_Work_Citation:
Citation_Information:
Originator: Eskew, L G. (comp.)
Publication_Date: 1995
Title:
Forest health through silviculture: proceedings of the 1995 National Silviculture Workshop
Geospatial_Data_Presentation_Form: conference proceedings
Series_Information:
Series_Name: General Technical Report
Issue_Identification: RM-GTR-267
Publication_Information:
Publication_Place: Fort Collins, CO
Publisher: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station
Other_Citation_Details:
Mescalero, New Mexico, May 8-11, 1995
Cross_Reference:
Citation_Information:
Originator: Powers, Robert F.
Originator: Oliver, William W.
Publication_Date: 1978
Title:
Site classification of ponderosa pine stands under stocking control in California
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Research Paper
Issue_Identification: PSW-RP-128
Publication_Information:
Publication_Place: Berkeley, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Other_Citation_Details:
9 p.
Online_Linkage: https://research.fs.usda.gov/treesearch/29577
Cross_Reference:
Citation_Information:
Originator: Rabin, Lawrence A.
Originator: Oliver, William W.
Originator: Powers, Robert F.
Originator: Ritchie, Martin, W.
Originator: Busse, Matt, D.
Originator: Knapp, Eric E.
Publication_Date: 2009
Title:
Historical growth plots in the Pacific Southwest
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: General Technical Report
Issue_Identification: PSW-GTR-213
Publication_Information:
Publication_Place: Albany, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station
Other_Citation_Details:
83 p.
Online_Linkage: https://doi.org/10.2737/PSW-GTR-213
Online_Linkage: https://research.fs.usda.gov/treesearch/31814
Cross_Reference:
Citation_Information:
Originator: Zhang, Jianwei
Originator: Oliver, William W.
Originator: Powers, Robert F.
Publication_Date: 2013
Title:
Reevaluating the self-thinning boundary line for ponderosa pine (Pinus ponderosa) forests
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Canadian Journal of Forest Research
Issue_Identification: 43(10): 963-971
Online_Linkage: https://doi.org/10.1139/cjfr-2013-0133
Online_Linkage: https://research.fs.usda.gov/treesearch/23504
Cross_Reference:
Citation_Information:
Originator: Zhang, Jianwei
Originator: Finley, Kaelyn A.
Originator: Johnson, Nels G.
Originator: Ritchie, Martin W.
Publication_Date: 2019
Title:
Lowering stand density enhances resiliency of ponderosa pine forests to disturbances and climate change
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Forest Science
Issue_Identification: 65(4): 496-507
Online_Linkage: https://doi.org/10.1093/forsci/fxz006
Online_Linkage: https://research.fs.usda.gov/treesearch/58204
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
These data were checked for basic accuracy and consistency as soon as measurements were completed by comparing against the previous measurements and the relationship between height and DBH. When issues were found, the data were checked against original datasheets and adjustments made when possible.
Logical_Consistency_Report:
These data are logically consistent. The consistency was verified as part of the quality assurance that occurred as measurements were completed.
Completeness_Report:
Not all variables were measured at all times, but all recorded data are included. Cells are left blank if not measured.
Lineage:
Methodology:
Methodology_Type: Field
Methodology_Description:
SITE DESCRIPTIONS

Study sites were chosen to represent a range of site qualities and age over a broad geographic area. Study sites were installed in homogenous, usually even-aged stands.

Adin Pass: 5200 feet (ft) elevation. Just east of Adin Pass on highway 299 behind a U.S. Forest Service (USFS) sign titled, "Timber Stand improvement. A thinning demonstration plot from a stand of natural origin of a mixture of ponderosa pine and Jeffrey pine." This study plot was established by Modoc National Forest in 1957 when it was approximately 61 years old.

Antelope Mountain: Originally four measurement plots located at approximately 6260 ft elevation in the SE 1/4 of Sec.2 and SW 1/4 of SW 1/4 Sec. 1, T. 31 N., R. 9 E. about 2 1/2 miles southwest of Antelope Mountain. A mixture of ponderosa and Jeffrey pine seedlings were planted by Lassen National Forest in 1928 following a wildfire in 1927. Originally, there were 4 plots at this study site, due to an unplanned thinning during sometime between 2002 and 2009, plot #4 had very few remaining trees and was eliminated after 2009. Plot 1 was left as an untreated control. All thinned plots later had an underburn following thinning. The study establishment year was 1991.

BMEF: Study site at 5995 ft elevation. A Jeffrey pine stand of natural origin located within the Blacks Mountain Experimental Forest. A single plot established in 1957 by Don Gordon and Dennis Teeguarden. Plot has a history of heavy dwarf mistletoe infection.

Edson Creek: Study site at approximately 3920 ft elevation. Plots are located in the SW 1/4 of the SW 1/4 of Section 2, T.40 N., R.2W, on the McClout Flats of Shasta-Trinity National Forest. The study includes three, unbuffered and unreplicated plots established on a stand of natural origin by Region 5 in 1972. The unreplicated plots include thinning to 40%, 55%, and 70% of normal basal area appeared in Meyer's 1938 yield table for similar stands. The McCloud Ranger District performed a prescribed fire in May of 1997.

Hog Lake: 4920 ft elevation. Plot is in NE 1/4 of the NW 1/4 of Sec. 16, T. 43 N., R. 8 E., just south of a crossroads and plainly visible from the road. A single plot established in 1944 by Elmer Butler on Modoc National Forest as a thinning and pruning experiment in a natural ponderosa pine stand.

Jelly Camp: 5485 ft elevation. Plot is along the Pittville highway in the SW 1/4 of the SE 1/4, Sec. 23, T. 34 N., R. 6 E. A Jeffrey pine stand of natural origin. Plot was established in 1962 by the Lassen National Forest as a thinning and slash treatment demonstration project.

Joseph Creek: 5460 ft elevation. The three ponderosa pine plots within the Joseph Creek Basin are in the NW 1/4 of Sec. 35 and the NE 1/4 of Sec. 34, T. 44 N., R. 14 E. Three plots were established on a naturally regenerated stand in 1961 by Ralph C. Hall and Glenn R. Davis from the Regional Office in Region 5, with the purpose of assessing the influence of thinning on reducing bark beetle mortality. Growth data began in 1963 due to substantial mortality in the two years post thinning. Plots were rethinned in 1991 by the Modoc National Forest.

KC Reservoir: A single plot at 4000 ft elevation. Study plot was established by Weyerhaeuser in a ponderosa pine plantation on Shasta Trinity National Forest at age 35 in 1972 and was last measured in 2009. When the company decided to abandon them, Bill Oliver, a research forester in Redding lab took them over.

Prattville: 4690 ft elevation. Three unreplicated plots were established on Lassen National Forest by Weyerhaeuser in 1971 as young plantation growth and yield plots. Plot 2013 was planted in July of 1955 with 1-1 ponderosa pine stock. Plot 2014 was planted in November 1960. Plot 2015 planted in May 1956. When the company decided to abandon them, Bill Oliver, a research forester in Redding lab took them over.

Show Plantation: 3910 ft elevation. This plantation was established on the McCloud Flats of Shasta-Trinity National Forest by S.B. Show in 1919 and is considered to be the oldest successful ponderosa pine plantation in California (perhaps in the world) and has been used for many years as a popular demonstration stand. A thinning study was established in 1972 by thinning three unreplicated and unbuffered 1-acre plots to 40%, 55%, and 70% of basal area shown in Meyer's 1938 yield table for similar stands. The residual basal area equivalents were 85, 103, and 152 square feet per acre. The plots were only thinned once.

Spaulding Butte: 4660 ft elevation. Three ponderosa pine plots on the Modoc National Forest are located surrounding the intersection of Highway 139 and County Road 91. Plots were installed by Weyerhaeuser in 1972 at the age of 52. Plots 2023 and 2024 (not to be confused with measurement years) were thinned while plot 2022 was left unthinned. When the company decided to abandon them, Bill Oliver, a research forester in Redding lab took them over.

Sugar Hill: 5400 ft elevation. Measurements are for a ponderosa and Jeffrey pine plantation on the west slope of the Warner Mountains on the Modoc National Forest in northeastern California starting in 1958 to 2021. Height to live crown was measured only during the measurement periods 1979, 1984, 1989, 1994, and 1999. Seedlings were planted in April, 1932 by the Civilian Conservation Corps at 8 x 8 ft spacing 3 years following a series of destructive fires that occurred in the previous natural stand. Six years following planting, survival of the stand was approximately 80% for ponderosa and 66% for Jeffrey. Six plots were installed in this plantation in 1958 through 1960 by thinning to a wide range of densities. Plots 1 and 2 were thinned and measured in 1958, plots 3, 5 and 6 were installed in 1960, and plot 4 was installed in 1961. Plot 1 was thinned to a tree spacing 3 times DBH + 4 ft (3D+4) (43 trees per acre [TPA]), and plot 2 was thinned to 2D + 4 (81 TPA). Plot 6 was an unthinned control (456 TPA), while plots 3, 4, and 5 were thinned to 100, 200 and 300 trees per acre, respectively. Thinning was done outside the growing season and the leave trees prioritized were well formed dominant or codominant trees that were at reasonably uniform spacings. Plots were established by the Modoc National Forest Timber Management Officer, Ken Smith who maintained and remeasured the plots until retirement, when PSW took responsibility. The final plot sizes varied from 0.75 to 2 acres. While the surrounding stands have been operationally thinned, the study plots were only thinned once.

Washington Mountain: 5215 ft elevation. The single plot is located in the SW 1/4 of the NE 1/4 of Sec. 19, T. 42 N, R. 9 E. on the Modoc National Forest. An interpretive sign along the road designated the plot as a Thinning Demonstration. This thinning demonstration plot was installed in 1959 in a naturally originated stand, and while it was originally unbuffered, the plot size was reduced to create a buffered measurement plot. The plot was underburned in spring, 1993 and the Stone Fire killed all but 4 plot trees in 2018.
Methodology_Citation:
Citation_Information:
Originator: Meyer, Walter H.
Publication_Date: 1938
Title:
Yield of even-aged stands of ponderosa pine
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Technical Bulletin
Issue_Identification: 630
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: U.S. Department of Agriculture
Methodology:
Methodology_Type: Field
Methodology_Description:
DATA COLLECTION

Following all study installations, trees were tagged at breast height (4.5 ft) and banded in yellow. All tagged trees were measured for diameter at breast height during each measurement period using d-tapes to the nearest 0.1 inch. A subset of trees were randomly chosen to be measured for total height using laser hypsometers. Heights would then be repeatedly measured for the same trees unless they died or had a condition that would eliminate them as a representative tree for heights (i.e., broken top, etc.). Stem deformities and evidence of damaging agents were recorded as condition codes. Height to live crown appears to have been measured at the discretion of the field crew. For consistency, when a tree died, the diameter of the previous measurement period was recorded. The majority of trees measured were Pinus ponderosa, and other species include: Pinus jeffreyi, Abies concolor, Calocedrus decurrens, Pinus lambertiana, Juniperus occidentalis, and Pinus contorta.

For additional details, please see Oliver (1972) and Oliver et al. (1978).
Methodology_Citation:
Citation_Information:
Originator: Oliver, William W.
Publication_Date: 1972
Title:
Growth after thinning ponderosa and Jeffrey pine pole stands in northeastern California
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Research Paper
Issue_Identification: PSW-RP-86
Publication_Information:
Publication_Place: Berkeley, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Other_Citation_Details:
8 p.
Online_Linkage: https://research.fs.usda.gov/treesearch/28749
Methodology_Citation:
Citation_Information:
Originator: Oliver, William W.
Originator: Powers, Robert F.
Publication_Date: 1978
Title:
Growth models for ponderosa pine: I. Yield of unthinned plantations in northern California
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Research Paper
Issue_Identification: PSW-RP-133
Publication_Information:
Publication_Place: Berkeley, CA
Publisher: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
Other_Citation_Details:
21 p.
Online_Linkage: https://research.fs.usda.gov/treesearch/30602
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Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Below you will find a list and description of the files included in this data publication.


VARIABLE DESCRIPTION FILE (1)

1. \Data\_variable_descriptions.csv: Comma-separated values (CSV) file containing a list and description of variables found in all data files. (A description of these variables is also provided in the metadata below.)

Columns include:

Filename = name of data file
Variable = name of variable
Units = units (if applicable)
Precision = precision (if applicable)
Description = description of variable


INFORMATIONAL FILES (2)

1. \Data\ConditionCodes.csv: CSV file containing list and description of tree condition codes.

Columns include:

TreeCondCode = Tree condition code.

Description = Description of code.


2. \Data\SpeciesCodes.csv: CSV file containing a list and description of tree species codes.

Columns include:

SpeciesCode = Tree species code.

CommonName = Common name of species.

ScientificName = Scientific name of species.


DATA FILES (13)

1. \Data\YellowPine\AdinPass.csv: CSV file containing tree growth data measured at Adin Pass between 1957 and 2021.

2. \Data\YellowPine\Antelope.csv: CSV file containing tree growth data measured at Antelope Mountain between 1991 and 2022.

3. \Data\YellowPine\BMEF.csv: CSV file containing tree growth data measured at Blacks Mountains Experimental Forest between 1957 and 2022.

4. \Data\YellowPine\Edson.csv: CSV file containing tree growth data measured at Edson Creek between 1972 and 2021.

5. \Data\YellowPine\Hoglake.csv: CSV file containing tree growth data measured at Hog Lake between 1944 and 2021.

6. \Data\YellowPine\JellyCamp.csv: CSV file containing tree growth data measured at Jelly Camp between 1962 and 2022.

7. \Data\YellowPine\JosephCk.csv: CSV file containing tree growth data measured at Joseph Creek between 1962 and 2021.

8. \Data\YellowPine\KCRes.csv: CSV file containing tree growth data measured at KC Reservoir between 1972 and 2009.

9. \Data\YellowPine\Prattville.csv: CSV file containing tree growth data measured at Prattville between 1971 and 2021.

10. \Data\YellowPine\Show.csv: CSV file containing tree growth data measured at Show Plantation between 1972 and 2021.

11. \Data\YellowPine\SpauldingButte.csv: CSV file containing tree growth data measured at Spaulding Butte between 1972 and 2021.

12. \Data\YellowPine\SugarHill.csv: CSV file containing tree growth data measured at Sugar Hill between 1958 and 2021.

13. \Data\YellowPine\WashingtonMtn.csv: CSV file containing tree growth data measured at Washington Mountain between 1963 and 2021.


All of these CSV files same variables (unless noted otherwise below):

Locale = Internal study site designation (1 = AdinPass, 2 = WashingtonMtn, 3 = JellyCamp, 6 = SugarHill, 7 = HogLake, 10 = JosephCK, 11 = Show, 12 = Edson, 13 = BMEF, 14 = Antelope, 2013/2014/2015 = Prattville, 2022/2023/2024 = SpauldingButte, 2033 = KCRes)

Plot = Plot identifier number.

Treatment = Plot treatment description. Note: This variable is only included for study sites with more than 1 plot and with a clear treatment design, which includes Edson, Show and SugarHill. Treatments for Edson, Show, and SugarHill are listed below.
Edson treatments include:
40% BA = thinned to 40% of normal basal area for similar stands;
55% BA = thinned to 55% of normal basal area for similar stands; and
70% BA = thinned to 70% of normal basal area of similar stands).
Show treatments include:
40% BA = thinned to 40% of normal basal area for similar stands;
55% BA = thinned to 55% of normal basal area for similar stands; and
70% BA = thinned to 70% of normal basal area of similar stands.
SugarHill treatments include:
100 TPA = thinned to 100 trees per acre;
200 TPA = thinned to 200 trees per acre;
2D+4 = thinned to a tree spacing 2 times DBH + 4ft (81 TPA);
300 TPA = thinned to 300 trees per acre;
3D+4 = thinned to a tree spacing 3 times DBH + 4 ft (43 trees per acre); and
Control 1D+4 = unthinned control.

Tree = Tree identifier number.

Species = Tree species identifier number (see \Data\SpeciesCodes.csv for codes descriptions).

YrMeas = Year of measurement.

StandAge = Stand age at time of measurement.

DBH = Tree diameter at breast height in inches.

Height = Total height in feet. Measured for a subset of measurement trees. Blank if not measured. NOTE: precision varies across files.

HLC = Height to base of live crown in feet. Blank if not measured. NOTE: precision varies across files.

Condition1 = Tree defects, heath issues, or mortality (see \Data\ConditionCodes.csv for code descriptions).

Condition2 = Additional tree defects, health issues, or mortality status if more than one condition reported (see \Data\ConditionCodes.csv for code descriptions).

CutClass = Any numerical value indicates a tree that was selected to be cut. The number itself, indicates which additional thin occurred, i.e., 1 represents trees removed in the first re-thin.



SUPPLEMENTAL FILES (12)

1. \Supplements\All_Site_Locations_CA.jpg: Joint Photographic Experts Group (JPG) image file containing a topographic map of California and all 13 site locations.

2. \Supplements\All_StudySites.jpg: JPG image file containing a zoomed in topographic map of California and all 13 site locations.

3. \Supplements\AntelopeMtn_Plots.pdf: Portable Document Format (PDF) file containing a partial map showing the location of the plots on Antelope Mountain plantation.

4. \Supplements\Edson_Plots.pdf: PDF file containing a partial map showing the location of the plots on Edson.

5. \Supplements\Prattville_Plots.pdf: PDF file containing a partial map showing the location of the plots on Prattville.

6. \Supplements\Prattville_Plots_2.jpg: JPG image file containing a portion of a topographical map showing the location of the plots on Prattville.

7. \Supplements\ShowPlantation_Plots.pdf: PDF file containing a partial map showing the location of the plots on the Show Plantation.

8. \Supplements\ShowPlantation_Plots_2.jpg: JPG image file containing a portion of a topographical map showing the location of the plots on the Show Plantation.

9. \Supplements\SpauldingButte_Plots.pdf: PDF file containing a partial map showing the location of the plots on the Spaulding Butte.

10. \Supplements\SpauldingButte_Plots_2.jpg: JPG image file containing a portion of a topographical map showing the location of the plots on Spaulding Butte.

11. \Supplements\SugarHill_Plots_description.tif: Tagged Image file format (TIFF) containing a portion of a topographical map showing the location of the plots on Sugar Hill, by treatment description.

12. \Supplements\SugarHill_Plots_number.tif: TIFF file containing a portion of a topographical map showing the location of the plots on Sugar Hill, by plot numbers.
Entity_and_Attribute_Detail_Citation:
Oliver, William W. 1972. Growth after thinning ponderosa and Jeffrey pine pole stands in northeastern California. Research Paper. PSW-RP-85. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 8 p. https://research.fs.usda.gov/treesearch/28749
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