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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

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