Environmental Assessment
Environmental Assessment
Environmental Assessment
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AFFECTED ENVIRONMENT & ENVIRONMENTAL CONSEQUENCES CHAPTER 3<br />
economic activity and dependent social services. The effects discussed in this section, are very difficult<br />
to measure, but would tend to have a disproportional impact on local low income households. In contrast,<br />
minority groups from outside the immediate area would, whether harvesting forest products or helping in<br />
pre-commercial thinning efforts, probably see fewer changes in income when compared to other groups.<br />
Wildlife<br />
The following items are analyzed and effects compared by alternative:<br />
• Connectivity and Fragmentation;<br />
• Summary of Wildlife Species / Management Indicator Species;<br />
• Snags, Green Tree Replacements (GTRs) and Coarse Woody Material (CWM) Habitat;<br />
• Special/Unique Habitats;<br />
• Ecological Indicator Species/Habitats and Focal Species (Landbirds);<br />
• Proposed Endangered, Threatened, and Sensitive (PETS) Wildlife Species; and<br />
• Resident and Migratory Landbirds.<br />
Connectivity and Fragmentation – Condition of Late and Old Structure Habitat (LOS)/Old Growth<br />
Management Areas (OGMAs).<br />
Existing Condition<br />
The forested portion of the planning area has a significant amount of multi-story Late and Old Structure<br />
(LOS) ponderosa pine forest (approximately 5,220 acres or approximately 20 percent of the forest acres)<br />
and a very low amount of single-story LOS forest (approximately 644 acres or approximately two (2)<br />
percent of the forested acres). Lodgepole forest types include 3,384 acres (13 percent of the forested<br />
acres) in the late seral condition.<br />
Table 3-38 displays seven structural stages, defines and describes each stage, and displays the alternative<br />
label commonly associated with each stage (reference Screens EA, Appendix B revised amendment #2<br />
for definitions similar to these).<br />
Table 3-38 Forest Stand Structural Stages<br />
Structural Stage Definition Description<br />
SS 1 Stand Initiation<br />
SS 2 Stem Exclusion,<br />
Open Canopy<br />
SS 3 Stem Exclusion,<br />
Closed Canopy<br />
SS 4 Understory<br />
Initiation<br />
SS 5 Multi-Stratum<br />
without Large Trees<br />
SS 6 Multi-Stratum<br />
with Large Trees<br />
SS 7 Single- Stratum<br />
with Large Trees<br />
Growing space is reoccupied following a<br />
stand replacing disturbance (e.g. wildfire,<br />
harvest). Usually early seral tree species.<br />
Crowns are open growing, canopy is<br />
broken, may be a moisture limiting area or<br />
maintained by frequent underburning,<br />
density management or high water table.<br />
Occurrence of new tree stems is mostly<br />
limited by light due to tree density.<br />
Canopy is closed.<br />
Understory establishing under an overstory.<br />
Mortality in overstory creates growing<br />
space for new trees in the understory.<br />
Several canopy layers established due to<br />
influence of management, fires, insect &<br />
disease group mortality. Large trees (>21”<br />
DBH) generally absent as a result of<br />
harvest or other disturbance.<br />
Multi canopy layers/strata stands with<br />
large, old trees.<br />
Single canopy layer/strata of large, old<br />
trees.<br />
3-123<br />
Grass, forb, seed/sapling dominated. Scattered<br />
overstory may be present as in a seed tree or open<br />
shelterwood stand.<br />
Poles to small saw logs