ENVIRONMENTAL CONSEQUENCES in rocky mountain coniferous ...

Natural Regenerati on
In September 1979, 5 years after logging, natural regeneration was considered
inadequate on all areas regardless of cutting method or site conditions (utilization
level and understory or seedbed treatment). Both the number pf 3- and 5-year-old
seedlings per acre and their stocking were greater on the shelterwood cuts (table 3)
than on the group selection cuts (table 4) or the clearcuts (table 5).
First-year
seedlings were counted but not included in these data because they will be greatly
reduced in number through competition for available light and moisture.
Table 3.--Number of 3- and 5-year-old seedlings per acre and percent of milacre plots
stocked by them on shelterwood cuttings, by site condition, September 1979
Site condition Seedlings per acre (ha) Stocking
Utilization Seedbed A1 1 A1 1
1 eve1 Understory treatment WL D F species WL DF species
Number Percent
Lower Shel terwood (Block 11 )
Intensive
Conventional
Close fiber
Cut
Cut
Cut
Not burn:
Not burn
None
650 (2631 250 (101) 900
900 (364
650 (263) 20; 1. 8P{ %
In tens i ve Uncut None 450 (182) 250 (101) 700
Upper Shel terwood (Block 21 )
Intensive Cut Burn 700 (283) 100 ( 40) 800 (324) 20 10 20
Conventional Cut Burn 1100 (445) 150 ( 61) 1250 (506) 40 15 4 0
Close fiber Cut None 20Q(8l) 150(61) 400(162) 1Q 15 2 5
Close fiber Uncut None 750(.61) 50(20) 200(81) 70 5 10
' Subbl ocks were never burned.
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