3.6.2. Invasive, Non-Native Plant Species

Noxious and invasive weeds are a continuing threat to the biological diversity and integrity of native ecosystems. Noxious and invasive weeds cause the loss of productive rangeland, loss of wildlife habitat, increased soil erosion, decreased biological diversity, and increase risk of fire. No noxious weeds were observed during the field surveys; however, some patches of nonnative species were observed throughout the project area, including cheatgrass (Bromus tectorum), red brome (Bromus madritensis), split grass (Schismus arabicus), and Russian thistle (Salsola tragus). In addition, red stemmed filaree (Erodium cicutarium) was also found throughout the project area, but was particularly dense in areas with disturbed soils, such as corral, driveway, etc. Other ornamental trees were planted adjacent to buildings, but these species are supported by irrigation and are not expected to establish in the community.

Executive Order 13112, signed by President Clinton in 1999, sets up a mechanism to prevent the introduction of invasive species; provides for their control; and minimizes the economic, ecological, and human health impacts that invasive species cause. Weeds are difficult to control unless there is regional land management cooperation such as federal, state, county, and private groups. The Carlson-Foley Act ( P.L. 90-583), as well as state and county laws, holds the federal government responsible to control designated noxious and invasive weeds on federal land and provide direction for their control. Although the site is relatively disturbed, the limited access to the site has likely limited the introduction of noxious weeds to the site.

The Nevada Agricultural Department has designated a list of non-natives species as noxious. Appendix E, Noxious Weeds lists these noxious weeds by threat category.

Invasive species and noxious weeds are already well established in the Las Vegas Valley. Noxious weeds are being managed by land managers (such as the BLM ) and on a regional level by Clark County Vector Control, Conservation District of Southern Nevada, Southern Nevada Water Authority, and others.