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After wildfires in 1996 in the sagebrush (Artemisia spp.) and pinyon-juniper (Pinus spp.-Juniperus spp.) zones of west-central Utah, the USDI-BLM attempted to reduce soil erosion and cheatgrass proliferation (Bromus tectorum L.) through rehabilitation treatments. We compared the vegetation of aerially seeded, chained treatments with aerially seeded but non-chained treatments for 3 years following seeding. Vegetation cover increased significantly in both treatments between the first and second year, concurrent with above-average precipitation. By the second year, seeded grasses, primarily crested wheatgrass Agropyron cristatum (L.) Gaertn. and intermediate wheatgrass Elymus hispidus (Opiz) Meld. and Elymus elongatus...
The one percent stratified random sample of 1,003,000 acres comprising BLM's Canyonlands planning area yielded 225 prehistoric sites. Stratified by vegetation, this small percentage inventory served to test the sampling design and allow for future refinements. Analysis of recovered data by site funtion, cultural affiliation, topography and vegetation was completed on all four planning units. Tentative site density projections based on the sample were developed as a BLM management tool. Published by Bureau of Land Management, in 1978.
In arid and semiarid lands throughout the world, the cover of vegetation is generally sparse or absent. Open spaces between the higher plants are not bare of autotrophic life but usually covered by a community of highly specialized organisms. This soil surface floral community consists of cyanobacteria, green algae, lichens, mosses, microfungi, and other bacteria. Cyanobacterial and microfungal filaments weave throughout the top few millimeters of soil, gluing loose soil particles together to form a biological crust. These crusts occur in all hot, cool, and cold arid and semiarid regions. They may constitute up to 70% of the living cover (Belnap 1994) and have only recently been recognized as having a major influence...