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Penobscot Experimental Forest

Data Catalog

We maintain a number of data sets associated with our long-term studies. Those that are published and available online are described below. The links in this section open new windows containing the data publication information, which include links to the actual data or data web site.

Access to our data sets requires agreement to abide by our data use policy, and some information about how the data will be used and by whom. This information is used by the Forest Service to assess the usefulness and impact of the data product. The metadata for these published data can be viewed by anyone, but only those who have agreed to the data use policy, provided the necessary information, and signed into the system will be able to query the databases.

Lock symbol which represents Monitored Access data Penobscot Experimental Forest boundary, roads, trails, management units, and permanent sample plot locations

Abstract: This data product contains shapefiles for the Penobscot Experimental Forest (PEF) boundary as well as the roads and trails. It also contains the location of all USDA Forest Service management units (MUs) across the forest and the location of the permanent sample plots (PSPs, also continuous forest inventory plots, CFI) within the Compartment Management Study and Management Intensity Demonstration Study on the PEF.

Lock symbol which represents Monitored Access data Overstory tree and regeneration data from the "Management Intensity Demonstration" study at Penobscot Experimental Forest

Abstract: This data product contains overstory and sapling tree measurements, seedling stocking tallies, and permanent sample plot location data collected from 1950 to 2011 at the Penobscot Experimental Forest in Maine. These data were collected under the working plan: RS-NE "Cutting Practice Level Plots: Penobscot Experimental Forest" and later revisions (see Methodology citation section). This study provides data for four different management regimes: selection cutting on 5-year ("high-order") and 15-year ("good") cycles, fixed diameter-limit cutting on a 15-year cycle ("fair"), and unregulated harvest ("poor") which is also called commercial clearcutting.

Lock symbol which represents Monitored Access data Overstory tree and regeneration data from the “Silvicultural Effects on Composition, Structure, and Growth” study

Abstract: This data product contains the baseline overstory tree measurements, regeneration data, and permanent sample plot location information collected, from 1952 to present, under the study plan: FS-NRS-07-08-01 “Study Plan: Silvicultural effects on composition and structure of northern conifers in the Acadian Forest Region: Revision of the Compartment Management Study on the Penobscot Experimental Forest”. Data are available in five data sets:

  1. Overstory tree measurement data include permanent sample plot locations and tree measurement data such as: species, status code (e.g., dead or alive), and diameter at breast height.
  2. Spatial location data provide location of a subsample of individual trees in the study.
  3. Height and crown measurement data include tree height, height to crown base, along with crown radius in 4 cardinal directions for a subsample of trees.
  4. Regeneration data include tree species, seedling presence, and count of trees by height class.
  5. Permanent plot location data include the geospatial coordinates for permanent sample plots.
Lock symbol which represents Monitored Access data Precommercial thinning x fertilization study data

Abstract: This data product contains the data from the precommercial thinning by fertilization study initiated in 1976 and collected under the study plan: 4100-FS-NE-1101-58 “Study Plan: Cultural treatments designed to reduce spruce sawlog rotation age - an early release and fertilization study” (see Methodology citation section). Fertilizer treatments were non- fertilized and fertilized with granulated lime stone. Precommercial thinning treatments were no-release, spaced, row thinning with crop tree release, and row thinning with no crop tree release. Data include treatment information as well as tree species, diameter at breast height, height, height to crown base, and crown width measured periodically since 1976. Data are currently available through 2008.

Lock symbol which represents Monitored Access data Overstory and regeneration data from the "Rehabilitation of cutover mixedwood stands" study

Abstract: This data package contains crop tree, overstory, sapling, and regeneration data collected between 2008 and 2012 as part of the project titled "Rehabilitation of cutover mixedwood stands: An economic and silvicultural assessment of alternatives" as described in Appendix C of FS-NRS-07-08-01 "Silvicultural effects on composition, structure and growth of northern conifers in the Acadian Forest Region 2008 study plan" (also known as the Compartment Management Study, see Kenefic et al. 2015). While the Rehabilitation study was conducted within two management units of the Compartment Management Study (CMS) the data for the Rehabilitation study are independent of the CMS.

The Rehabilitation study examined two levels of intervention treatments against controls in two stands that had been subjected to repeated commercial clearcutting harvests, last occurring 20 and 25 years before. The intervention treatments were 1) moderate treatment, in which crop trees were identified and released, and 2) intensive treatment, in which crop trees were released, unacceptable growing stock was removed, and fill planting of red spruce was conducted. Data are available in seven data sets:

  1. crop tree stem map
  2. crop tree DBH (diameter at breast height) and mortality
  3. crop tree heights;
  4. overstory DClass (diameter class in inches);
  5. sapling DClass;
  6. regeneration tally
  7. overstory plot locations

Lock symbol which represents Monitored Access data Data from the "Tree Quality Outcomes of Silvicultural Treatments” study at the Penobscot Experimental Forest

Abstract: This data publication contains tree quality assessments from the Penobscot Experimental Forest (PEF) in Bradley and Eddington, Maine, USA. Trees were assessed using one or more of the following criteria: merchantable or unmerchantable (cull); acceptable growing stock (AGS) or unacceptable growing stock (UGS); and by tree form and risk codes. AGS trees are those that observers expected to maintain or increase in value; UGS are high risk or low quality trees not expected to maintain or increase in value (individual protocols used for datasets being presented are described in detail in the Methodology section of this publication). Data presented in this publication were collected by researchers at the U.S. Forest Service (FS), Northern Research Station, and University of Maine (UM) School of Forest Resources in permanent sample plots (PSP) between 2012 and 2015. All data were collected in management units (MUs) assigned to either the Compartment Management Study (CMS) or the Management Intensity Demonstration (MID) at the PEF, both of which are long-term studies.

Lock symbol which represents Monitored Access data Understory vegetation and site condition data from the "Nonnative Invasive Plants" study at the Penobscot Experimental Forest

Abstract: This data publication contains understory plant density and cover class, substrate condition, microtopography, soil drainage, and canopy openness collected in 2006-2007 for 654 milacre plots (milplots) on 327 plots in 24 forest stands representing 10 silvicultural treatments (including an unharvested reference) and an old field on the Penobscot Experimental Forest (PEF) in central Maine, USA. These data were collected to obtain a more complete understanding of the extent of invasive species in a long-term PEF silvicultural experiment, as well as the relationships between treatment, site, and characteristics of the understory plant community.

Last Modified: January 24, 2020