HJA newt logo HJ Andrews
Login Donate
visit HJA Andrews on Twitter visit HJA Andrews on Facebook HJA RSS news feed


DEMO: Vegetation Data - Pre-Harvest

  • PI: Charles B. Halpern
  • Originator: Charles B. Halpern
  • Other researchers: Shelley A. Evans
  • Dates of data collection: Jul 1 1994 - Oct 31 1997
  • Data collection status: Study collection is completed and no new collection is planned
  • Data access: Online
  • Last update: Jan 21 2015 (Version 4)

    <Citation>      <Acknowledgement>      <Disclaimer>

Forest management practices on public lands have changed significantly in the last decade in response to growing concerns that traditional approaches have led to widespread loss and fragmentation of old-growth ecosystems and to declines in the biological diversity associated with late seral forests. New standards and guidelines contained in the Northwest Forest Plan specify the minimum levels and spatial patterns of live trees and coarse woody debris that must be retained on lands subject to timber harvest ("matrix" lands and Adaptive Management Areas). Although these recommendations represent the collective knowledge, experience, and professional judgement of the biologists and ecologists who contributed to the Northwest Forest Plan, the ecological consequences of these new approaches have not been rigorously tested.

In the early 1990s several private research institutions and public interest groups sought federal funding for research to address this need. In 1992, the Pacific Northwest Region (Region 6) of the USDA Forest Service received Congressional direction to establish a major silvicultural experiment in Washington and Oregon "using new forestry and landscape management techniques." The Demonstration of Ecosystem Management Options (DEMO) study evolved as a regional interdisciplinary experiment to examine the responses of diverse groups of forest organisms and processes to variation in the amount or pattern of live trees retained through harvest.

Study Description Study Site Map Taxonomic Hierarchy Download Study Location Information: (CSV)
Download Full Documentation: (PDF) (EML)
1 Physical and Site Characteristics (U-A1) METADATA DATA
2 Transect Bearings and Rebar Placement (U-A2) METADATA DATA
3 Percent Overstory Canopy Cover: Moosehorn Densiometer (U-A) METADATA DATA
4 Herb Layer Cover and Height, Numbers of Tree Seedlings (U-B) METADATA DATA
5 Ground Surface Conditions (U-C) METADATA DATA
6 Tall Shrub and Understory Tree Layer: Cover (U-D1) METADATA DATA
7 Tall Shrub and Understory Tree Layer: Height (U-D2) METADATA DATA
8 Coarse Woody Debris (U-E) METADATA DATA
9 Density of Understory Trees (U-F) METADATA DATA
10 Pre-Harvest Tree Diameters (O-A) METADATA DATA
11 Snag Measurements (O-B) METADATA DATA
12 Tree Heights METADATA DATA
14 Percent Overstory Canopy Cover: Truck Mirrors (U-H) METADATA DATA
15 Preharvest Disturbance: Stumps and Skid Rows (U-I) METADATA DATA
16 Preharvest Disturbance: Tree Falls and Tree Breakage (U-J) METADATA DATA
17 Epiphytic Lichen Biomass METADATA DATA

  Field manual - trees - DEMO establishment report field manual for overstory and understory trees (2009)
  Field manual - understory vegetation - DEMO establishment report field manual for understory vegetation (2008)
  DEMO - DEMO website at PNW

 DEMO: Vegetation Data - Post-Harvest (TP108)