You are here: NRS Home / Publications & Data / Field efficiency and bias of snag inventory methods

Publication Details

Publication Toolbox
  • Download PDF  (1.3 MB)
  • This publication is available only online.

Field efficiency and bias of snag inventory methods

Year Published

2005

Source

Canadian Journal of Forest Research 35:2900-2910

Abstract

Snags and cavity trees are important components of forests, but can be difficult to inventory precisely and are not always included in inventories because of limited resources. We tested the application of N-tree distance sampling as a time-saving snag sampling method and compared N-tree distance sampling to fixed-area sampling and modified horizontal line sampling in mixed pine-hardwood forests of southern Maine and New Hampshire. We also present a novel modification of N-tree distance sampling that limits the distance from plot center that an observer must search to find tally trees. A field test shows N-tree to be quick, but generally biased and characterized by high variability. Distance-limited N-tree sampling mitigates these problems, but not completely. We give recommendations for operational snag inventory in similar forest types.

Citation

Kenning, Robert S.; Ducey, Mark J.; Brissette, John C.; Gove, Jeffery H. 2005. Field efficiency and bias of snag inventory methods. Canadian Journal of Forest Research 35:2900-2910
Last updated on: June 14, 2006

NRS at a Glance