Forest ecotone survey by line intersect sampling

Conditioning Inference on Line Orientation in Line Intersect Sampling

Field Results for Line Intersect Distance Sampling of Coarse Woody Debris

A growing recognition of the importance of downed woody materials in forest ecosystem processes and global carbon budgets has sharpened the need for efficient sampling strategies that target this resource. Often the aggregate volume, biomass, or carbon content of the downed wood is of primary interest, making recently developed probability proportional-to-volume designs such as line intersect d...

Practical Aspects of the Line Intersect Method

This report provides information and comment on a number of practical aspects of the line intersect method, including specific equations for volume and weight for various sets of units; problems of orientation bias and sample layout; diameter-class limits and centres; use of the method to determine total length of pieces or networks and piece-length distribution; sample size, length of line, an...

Tree recruitment in the Forest-tundra Ecotone

ACKNOWLEDGEMENTS: This thesis is a product under the International Polar Year (IPY) core project PPS Arctic (http://ppsarctic.nina.no) which was financially supported by the Research Council of Norway via the IPY grant 176065/S30 to A. Hofgaard. I would like to thank my supervisors Lars Söderström (NTNU) and Annika Hofgaard (NINA) for their time and effort in helping me build and structure this...

Zigzag Survey Designs in Line Transect Sampling

Zigzag survey lines are frequently used in shipboard and aerial line transect surveys of animal populations. Analysis proceeds assuming that coverage probability through the survey region is uniform. We show that the two types of zigzag design that are in wide use do not generally have this property, and explore the degree of bias in abundance estimates that can be anticipated. We construct a z...