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Biological soil crusts are regarded as an indicator of healthy landscapes. To understand the response of biological soil crusts to grazing in northern sagebrush steppe, we examined nine Artemisia-dominated sites in Wyoming where livestock have been excluded for 32–45 years. Using two common sampling methods (20 m line transects and 0.25 m2 quadrats) we determined biological soil crust cover and richness inside and outside exclosures. Total biological soil crust cover did not differ inside and outside the exclosures at any of the nine sites, regardless of monitoring method. Cover of biological soil crusts using the transect method ranged from 2% to 8% inside and 1% to 6% outside the exclosure. Cover of biological...
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Biological soil crusts are an integral part of dryland ecosystems. We monitored the cover of lichens and mosses, cyanobacterial biomass, concentrations of UV-protective pigments in both free-living and lichenized cyanobacteria, and quantum yield in the soil lichen species Collema in an undisturbed Mojave Desert shrubland. During our sampling time, the site received historically high and low levels of precipitation, whereas temperatures were close to normal. Lichen cover, dominated by Collema tenax and C. coccophorum, and moss cover, dominated by Syntrichia caninervis, responded to both increases and decreases in precipitation. This finding for Collema spp. at a hot Mojave Desert site is in contrast to a similar...
Transplanted bryophytes can provide an indication of bioavailability. Rates of accumulation were related to the magnitude of ambient trace-element concentrations; maximal uptake occurred during the first 10 d of exposure. Trace-element concentrations in transplanted bryophytes could potentially be used to predict water and sediment concentrations that represent an integration of conditions over short to intermediate lengths of time, rather than instantaneous conditions as measured using water samples. Published in Environmental Toxicology and Chemistry, volume 16, issue 12, on pages 2521 - 2528, in 1997.
Biological soil crusts (biocrusts) cover up to 60–70% of the soil surface in grasslands rehabilitated during the “Grain for Green� project implemented in the hilly Loess Plateau region in 1999. As biocrusts fix nitrogen (N), they are an important part of restoring soil fertility. We measured nitrogenase activity (NA) in biocrusts from sites rehabilitated at six different time periods to estimate 1) the effects of moisture content and temperature on NA in biocrusts of different ages and 2) the potential N contribution from biocrusts to soils and plants in this region. Results show that NA in the biocrusts was mostly controlled by the species composition, as the activity of biocrusts dominated by free-living...
map background search result map search result map Biological soil crusts in grazed and ungrazed Wyoming sagebrush steppe Dynamics of cover, UV-protective pigments, and quantum yield in biological soil crust communities of an undisturbed Mojave Desert shrubland Moss Mine Topographic Map Moss Project Drill Hole Locations Map and Topography Contours Moss Mine West Oatman Project Drill Hole Location Map Moss Mine and Mossback Mine Claim Map Moss Project Drill Hole Locations Map and Topography Contours North Oatman Geology Map Moss Mine Longitudinal Projection Map Moss Mine 220 Ft. Level and Moss Mine Projection on Vertical Plane Moss Project Bench Map Map of Moss Group, Goldroad, Arizona Moss Mine Claim Map with Drill Hole Locations Map of 220 Ft. Level - Moss Mine Moss Project Section Map Moss Mine West Oatman Project Rock Chip Gold Geochemistry and Sample Locations USGS 1:24000-scale Quadrangle for Moss, MS 1964 USGS 1:24000-scale Quadrangle for Moss, MS 1964 USGS 1:24000-scale Quadrangle for Moss, MS 1964 USGS 1:24000-scale Quadrangle for Moss, MS 1964 Dynamics of cover, UV-protective pigments, and quantum yield in biological soil crust communities of an undisturbed Mojave Desert shrubland Biological soil crusts in grazed and ungrazed Wyoming sagebrush steppe