Can noxious weeds increase soil erosion and soil sedimentation?
Yes. Protecting and conserving the surface soil are critical to the long-term sustainability of healthy, functioning ecosystems. Soil provides nutrients and moisture necessary for plant growth and is fundamental to all life. When spotted knapweed invades range land dominated by native bunch grass, protection of soil and water resources is compromised. In one study, runoff was 1.5-times higher and sediment was 3 times higher on spotted knapweed-dominated plots than on plots dominated by the native bluebunch wheatgrass (Montana’s state grass). Loss of soil because of noxious weeds may have very serious consequences in the future. Can noxious weeds affect recreational value and uses? Yes. For most recreationists, the enjoyment of being outdoors in diminished in areas dominated by noxious weeds. Riding horseback through houndstongue promotes husbandry problems for horses when seeds attach to the hide. The invasion of spiny weeds, such as Canada thistle and musk thistle, limits river access
