Attachment 69_Exhibit_K_Plot Radius and Frequency.pdf
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- Malheur NF Tree Planting
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Department of Agriculture Forest Service
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This document is an appendix containing technical specifications for inspection plot methodology, specifically defining plot radius measurements and sampling frequencies for systematic grid-based inspections.
Table 1 provides plot radius corrections in feet across three plot sizes (1/100th acre, 1/50th acre, and 1/20th acre) adjusted for terrain slope ranging from 0% to 120%. Plot radii increase incrementally with slope steepness, with the 1/20th acre plot size ranging from 26.3 feet at 0% slope to 32.9 feet at 120% slope. Table 2 establishes the distance between inspection plots for systematic square grid sampling based on unit acreage. For units of 1–4 acres, 5 plots are required with distances of 93–187 feet respectively. Units of 5–40 acres require 1 plot per acre with 209-foot spacing, while units of 41–79 acres require 40 plots with distances ranging from 211 to 293 feet. Units of 80 or more acres require 1 plot per 2 acres with a maximum distance of 295 feet between plots.
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EXHIBIT K. INSPECTION PLOT RADIUS AND FREQUENCY
TABLE 2.
Distance Between Plots for a Systematic
Square Grid
Unit Acres Plots Distance in Feet
1 5 93
2 5 132
3 5 162
4 5 187
5-40 1 per acre 209
41 40 211
42 40 214
43 40 216
44 40 219
45 40 221
46 40 224
47 40 226
48 40 229
49 40 231
50 40 233
51 40 236
52 40 238
53 40 240
54 40 242
55 40 245
56 40 247
57 40 249
58 40 251
59 40 253
60 40 256
61 40 258
62 40 260
63 40 262
64 40 264
65 40 266
66 40 268
67 40 270
68 40 272
69 40 274
70 40 276
71 40 278
72 40 280
73 40 282
74 40 284
75 40 286
76 40 288
77 40 290
78 40 291
79 40 293
80+ 1 per 2 acres 295
TABLE 1.
Plot Radius Corrected for Slope in Feet
Average
% Slope
Plot Size
1/100th Ac 1/50th Ac 1/20th Ac
0 11.8 16.7 26.3
5 11.8 16.7 26.3
10 11.8 16.7 26.4
15 11.9 16.8 26.4
20 11.9 16.9 26.6
25 12.0 17.0 26.7
30 12.1 17.1 26.9
35 12.1 17.2 27.1
40 12.2 17.3 27.3
42 12.3 17.4 27.4
44 12.3 17.5 27.5
46 12.4 17.5 27.6
48 12.4 17.6 27.7
50 12.5 17.7 27.8
52 12.5 17.7 27.9
54 12.6 17.8 28.0
56 12.6 17.9 28.2
58 12.7 18.0 28.3
60 12.7 18.0 28.4
62 12.8 18.1 28.5
64 12.9 18.2 28.7
66 12.9 18.3 28.8
68 13.0 18.4 28.9
70 13.0 18.5 29.1
72 13.1 18.5 29.2
74 13.2 18.6 29.3
76 13.2 18.7 29.5
78 13.3 18.8 29.6
80 13.4 18.9 29.8
82 13.4 19.0 29.9
84 13.5 19.1 30.1
86 13.6 19.2 30.2
88 13.6 19.3 30.4
90 13.7 19.4 30.5
92 13.8 19.5 30.7
94 13.8 19.6 30.8
96 13.9 19.7 31.0
98 14.0 19.8 31.1
100 14.0 19.9 31.3
102 14.1 20.0 31.4
104 14.2 20.1 31.6
106 14.2 20.2 31.7
108 14.3 20.3 31.9
110 14.4 20.4 32.1
112 14.5 20.5 32.2
114 14.5 20.6 32.4
116 14.6 20.7 32.5
118 14.7 20.8 32.7
120 14.7 20.9 32.9
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