Appendix C- DFMZ Simulation
APPENDIX C
DFPZ SIMULATIONS

Introduction

Attached are simulations which provide insight into establishing and maintaining defensible fuel profile zone (DFPZ). The Western Sierra Nevada Prognosis Variant (WESSIN) of the Forest Vegetation Simulator (FVS) was used to generate numerical stand summaries; the Stand Visualization System (SVS) was used to produce the visual aids. (SVS is a separate system which can use output generated from FVS.)

Selected Stands

Three vegetation types and prominent strata were selected for simulation. Detailed description of strata are included in the Appendix B. Keep in mind, the management scenarios and selected stands represent a very small sample of possible actions. Selected strata are:

1. East-side pine - E or J regional vegetation type. East-side pine represents approximately 368,000 acres in the pilot project area. Within the E or J type, E3N is a common size and density. E3N can be best described as east-side, small sawtimber, and moderately stocked.

2. Mixed conifer - M regional vegetation type. Mixed conifer occupies approximately 254,000 acres of the pilot forested area. Of this, M3N comprises 97,000 acres of the M type.

3. Red fir - R regional vegetation type. Red fir occupies approximately 144,000 acres in the pilot area with 36,000 acres classified as R3N.

For each strata, a representative cluster plot from the most recent inventory was selected. Each of these cluster plots then served to proxy for a possible stand condition. The FVS and SVS software was used for stand information display and visual simulation.

Management Scenarios

Both M3N and R3N strata are considered suitable owl habitat. CASPO guidelines were modeled for initial treatments. The modeling will assume large trees will be a desirable component and all trees greater than 30 inches in diameter will be maintained for all subsequent treatments. E3N is not considered suitable owl habitat and hence CASPO guidelines do not apply. However, the modeling will assume the large tree component will be desirable. All thinning will be from below.

One caution needs mention here. Originally, harvest was set up to trigger on stand crown cover and crown cover growth. Crown cover modeling did not prove reliable and it is not an attribute that can be calibrated. In lieu of crown cover, reasonable basal area thinnings from below were substituted and used to establish stand attributes desirable for DFPZs.

Stand summaries and visual aids follow. For each stand, a brief discussion is included.

E3N STAND

Summary of Treatments. Thinnings were conducted in year 2000, 2020, 2040, and 2060. Year 2000 and 2020, thinning was from below to 90 square feet per acre. In year, 2040 and 2060, thinning was from below to 100 and 110 square feet per acre respectively.

Results. The initial treatment in year 2000 is not a timber sale opportunity. This treatment would would require payment to a contractor to perform the thinning work. Thinnings in years 2020, 2040, and 2060 are good commercial thin opportunities. Timber sale value for these treatments will allow for trust fund collection to perform needed fuelbreak maintenance.

The stand summary below lists numerical values for the stand by decade. The visuals also illustrate change over time. At key points, crown distribution tables are inserted. These give insight as to how ladder fuels are affected by treatments.

E3N STAND SUMMARY

SUMMARY STATISTICS (PER ACRE OR STAND BASED ON TOTAL STAND AREA)

START OF SIMULATION PERIOD
YEAR
AGE
NO OF TREES
BA
SDI
CCF
TOP HT
QMD
TOTAL CU FT
MERCH CU FT
MERCH BD FT
1994
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
0
6
16
26
36
46
56
66
76
86
96
106
562
556
69
68
31
31
23
22
19
18
18
17
119
139
113
135
104
117
112
121
118
126
134
141
262
297
166
191
133
146
132
141
133
140
146
151
64
71
33
38
26
28
25
27
25
27
28
29
62
67
75
82
90
95
101
104
106
107
107
108
6.2
6.8
17.3
19.1
24.6
26.4
30.0
31.6
34.2
35.8
37.3
38.7
2312
2841
3049
3929
3415
4022
4032
4483
4430
4806
5152
5463
1726
2236
2710
3520
3112
3680
3698
4109
4083
4436
4753
5052
7686
10349
14316
19371
18675
22666
23716
26761
27046
29697
32179
34457
REMOVALS
NO OF TREES TOTAL CU FT MERCH CU FT MERCH BD FT
0
485
0
36
0
7
0
3
0
0
0
0
0
547
0
1129
0
536
0
408
0
0
0
0
0
221
0
984
0
485
0
370
0
0
0
0
0
0
0
4661
0
2679
0
2223
0
0
0
0
AFTER TREATMENT
BA SDI CCF TOP HT RES QMD
119
93
113
90
104
100
112
110
118
126
134
141
262
143
166
119
133
121
132
126
133
140
146
151
64
29
33
23
26
23
25
24
25
27
28
29
62
67
75
84
90
97
101
104
106
107
107
108
6.2
15.5
17.3
22.7
24.6
28.1
30.0
32.6
34.2
35.8
37.3
38.7

 
E3N STAND. YEAR 2000. PRIOR TO THIN.
E3N STAND. YEAR 2000 CROWN HEIGHT GRAPH. PRIOR TO THIN.

click for enlargement of these images

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E3N STAND. YEAR 2010. AFTER THIN.
E3N STAND. YEAR 2010. CROWN HEIGHT GRAPH. AFTER THIN.
E3N STAND. YEAR 2020. PRIOR TO THIN.
E3N STAND. YEAR 2030. AFTER THIN.
E3N STAND. YEAR 2030. CROWN HEIGHT GRAPH. AFTER THIN.
E3N STAND. YEAR 2040. PRIOR TO THIN.
E3N STAND. YEAR 2050. AFTER THIN.
E3N STAND. YEAR 2060. PRIOR TO THIN.
E3N STAND. YEAR 2070. AFTER THIN.

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M3N STAND

Summary of Treatments. The initial thinning in year 2000 is according to CASPO guidelines. In year 2020, thinning was from below to 160 square feet per acre. Both thinnings did not harvest trees greater than 30 inches in diameter. After these two thinnings, all residual trees are above 30 inches in diameter.

Results. Both thinnings are excellent commercial timber sales. Timber sale value will allow for trust fund collection to perform needed fuelbreak maintenance work.

The stand summary below lists numerical values for the stand by decade. The visuals also illustrate change over time. At key points, crown distribution tables are inserted. These give insight as to how ladder fuels are affected by treatments.

M3N STAND SUMMARY

SUMMARY STATISTICS (PER ACRE OR STAND BASED ON TOTAL STAND AREA)

START OF SIMULATION PERIOD
YEAR  AGE NO OF TREES BA SDI  CCF TOP HT QMD TOTAL CU FT MERCH CU FT MERCH BD FT
1993
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
0
7
17
27
37
47
57
67
77
87
97
107
1304
1250
34
33
24
23
22
21
20
19
18
17
211
234
170
186
172
182
190
196
200
204
205
206
492
530
201
214
189
196
201
204
205
206
205
203
74
124
30
32
28
29
30
31
31
32
32
32
90
92
99
101
107
108
108
109
110
110
111
111
5.4
5.9
30.3
32.3
36.4
38.2
40.0
41.6
43.2
44.8
46.3
47.7
6329
6954
6074
6734
6403
6813
7128
7377
7586
7766
7889
7964
5483
6065
5532
6149
5867
6248
6543
6768
6974
7135
7255
7327
32019
35386
35373
39921
39074
41909
44236
45989
47650
48838
49885
50745
REMOVALS
NO OF TREES TOTAL CU FT MERCH CU FT MERCH BD FT
0
1215
0
8
0
0
0
0
0
0
0
0
0
1625
0
820
0
0
0
0
0
0
0
0
0
1222
0
741
0
0
0
0
0
0
0
0
0
4965
0
4275
0
0
0
0
0
0
0
0
AFTER TREATMENT
BA SDI  CCF TOP HT RES QMD
211
153
170
160
172
182
190
196
200
204
205
206
492
185
201
180
189
196
201
204
205
206
205
203
74
28
30
27
28
29
30
31
31
32
32
32
90
95
99
105
107
108
108
109
110
110
111
111
5.4
28.2
30.3
34.4
36.4
38.2
40.0
41.6
43.2
44.8
46.3
47.7

 
M3N STAND. YEAR 2000. PRIOR TO THIN.
M3N STAND. YEAR 2000 CROWN HEIGHT GRAPH. PRIOR TO THIN.
M3N STAND. YEAR 2010. AFTER THIN.
M3N STAND. YEAR 2010. CROWN HEIGHT GRAPH. AFTER THIN.
M3N STAND. YEAR 2020. PRIOR TO THIN.
M3N STAND. YEAR 2030. AFTER THIN.
M3N STAND. YEAR 2030. CROWN HEIGHT GRAPH. AFTER THIN.
M3N STAND. YEAR 2050.
M3N STAND. YEAR 2070.

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R3N STAND

Summary of Treatments. The initial thinning in year 2000 is according to CASPO guidelines. The next thinning opportunities occur in 2040 and 2060. All thinnings do not harvest trees greater than 30 inches in diameter. After 2060, all residual trees are greater than 30 inches in diameter.

Results. Both thinnings in 2040 and 2060 are excellent commercial timber sales. The 2000 treatment is not a timber sale opportunity. Timber sale value in 2040 and 2060 will allow for trust fund collection to perform needed fuelbreak maintenance work.

The stand summary below lists numerical values for the stand by decade. The visuals also illustrate change over time. At key points, crown distribution tables are inserted. These give insight as to how ladder fuels are affected by treatments.

R3N STAND SUMMARY

SUMMARY STATISTICS (PER ACRE OR STAND BASED ON TOTAL STAND AREA)

START OF SIMULATION PERIOD
YEAR AGE NO OF TREES BA SDI CCF TOP HT QMD TOTAL CU FT MERCH CU FT MERCH BD FT
1995
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
0
5
15
25
35
45
55
65
75
85
95
105
198
196
73
72
70
69
42
41
34
33
32
32
118
125
146
169
191
213
203
220
214
227
238
250
212
222
206
231
254
277
241
257
241
251
261
270
38
39
34
37
40
43
36
38
35
36
37
38
69
72
79
85
89
93
95
97
98
99
100
100
10.4
10.8
19.1
20.8
22.3
23.8
29.7
31.2
34.2
35.5
36.8
38.0
3181
3455
4341
5296
6221
7193
7134
7853
7629
8125
8582
9035
2772
3016
3855
4734
5577
6483
6478
7146
6952
7399
7832
8226
14448
15975
20977
26471
31952
38069
39751
44528
44141
47280
50465
53295
REMOVALS
NO OF TREES TOTAL CU FT MERCH CU FT MERCH BD FT
0
122
0
0
0
26
0
7
0
0
0
0
0
25
0
0
0
805
0
769
0
0
0
0
0
5
0
0
0
695
0
698
0
0
0
0
0
0
0
0
0
3137
0
3963
0
0
0
0
AFTER TREATMENT
BA SDI CCF TOP HT RES QMD
118
123
146
169
191
185
203
200
214
227
238
250
212
180
206
231
254
225
241
229
241
251
261
270
38
31
34
37
40
34
36
33
35
36
37
38
69
72
79
85
89
93
95
97
98
99
100
100
10.4
17.4
19.1
20.8
22.3
28.1
29.7
32.7
34.2
35.5
36.8
38.0
R3N STAND. YEAR 2000. PRIOR TO THIN.
R3N STAND. YEAR 2000 CROWN HEIGHT GRAPH. PRIOR TO THIN.
R3N STAND. YEAR 2010. AFTER THIN.
R3N STAND. YEAR 2010.CROWN HEIGHT GRAPH. AFTER THIN.
R3N STAND. YEAR 2040. PRIOR TO THIN.
R3N STAND. YEAR 2050. AFTER THIN.
R3N STAND. YEAR 2050.CROWN HEIGHT GRAPH. AFTER THIN.
R3N STAND. YEAR 2060. PRIOR TO THIN.
R3N STAND. YEAR 2070. AFTER THIN.

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