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Acadian Forest Volume Estimates Derived from Airborne LiDAR, Big BAF Sample Plots, and Fixed Area Plots on the Noonan Research Forest
UNB
Yung-Han Hsu; John A Kershaw, Jr. — 2020-05-31 The data are located on a 100 m N-S/E-W grid on the 80-ha Femelschlag Research Site on the Noonan Research Forest in New Brunswick, Canada. “Femel_EFI_GTV” contains the gross total volume (GTV; m3ha-1) estimates derived from airborne LiDAR scanning as part of the government of New Brunswick’s Enhanced Forest Inventory program. “Noonan_FemelPlot_GTV” contains the GTV estimates using four different plot types: fixed area plots with all trees measured for height; fixed area plots with 3P subsampling of heights; horizontal point sampling with all trees measured; and big BAF sample plots. The fixed area plots were circular with an 11.28 m radius and all tree 6cm DBH and greater were identified by species and measured for DBH and height. The 3P subsampling was simulated using a Height – Diameter curve as prediction and a target subsample size of 100 trees across the 83 plots. The horizontal point samples used a 2-M BAF angle gauge to select count trees for measurement. All trees 6 cm DBH and greater and considered “in” were identified by species and DBH measured. Heights were imputed using a Height – Diameter curve and the heights measured on the big BAF plots. The big BAF plots had the same plot design as the horizontal point samples and a 27-M BAF angle gauge was used to select trees for height measurement. All four plot types were center of the 100 m grid intersections. Grids do not align with EFI cells because the 100 m grid was established independently and prior to the EFI cells. The X – Y variables are the locations (in m) of the cell center (for Femel_EFI_GTV) and the plot centers (for Noonan_FemelPlot_GTV) with {0,0} being the SW corner of the study area.
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Applications of big BAF Sampling in Mixed Forests of Atlantic Canada
UNB
Chen, Yingbing; Yang, Ting-Ru; John A Kershaw, Jr. — 2020-06-30 The data are a subsample of an intensification of the 100 m North-South/East-West permanent sampling grid on the Noonan Research Forest. The 100m grid was intensified into a 50m grid. Three grid intersections per stand polygon were randomly selected. If a stand had fewer than 3 intersections, all intersections were selected. The stand polygons were based on the New Brunswick Department of Natural Resources’ Forest Development Survey derived from aerial photography taken in 1999. Horizontal point samples using a 2-M BAF angle gauge were the basis for all tree and plot measurements. The data were collected in summer 2002.
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Simulated Mapped Plots Derived from NL Spacing Trials for Sector Subsampling Study
UNB
Dai, Xiao; John A Kershaw, Jr. — 2020-12-01 The base data were collected from 3 early spacing trials located in western Newfoundland, Canada and established in the early 1980s. The dominant species was balsam fir with minor components of black spruce and white birch. Five spacing treatments were applied in this study areas using a randomized complete block design: control, or no spacing, (S00), 1.2m spacing (S12), 1.8m spacing (S18), 2.4m spacing (S24) and 3.0m spacing (S30). Each treatment was repeated 3 times per site (3×3×5 = 45 PSPs in this study). Treatments were applied to a 0.25 ha block (50m × 50m), and a circular permanent sample plot (PSP) was established near the center of each block. Plot sizes varied so that there were approximately 100 trees per plot following treatment. All trees 1.3 m and taller were identified by species and measured for diameter at breast height (DBH, nearest 0.01cm, BH = 1.3 m) and total height (HT, nearest 0.01 m). PSPs were remeasured at 3 to 5–year intervals but only the last measurements were used here. Stemwood, bark, branch, and foliage biomass (kg) was estimated for each tree using the Canadian national biomass equations. Total above-ground biomass (BM, kg) was estimated by summing these components.

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(Source Repository: University of New Brunswick Dataverse) AND (Author: John A Kershaw, Jr.)

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