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Esta sección le ofrece seis sistemas de consulta geográfica y un módulo de solicitud de imágenes satelitales: Mosaico nacional de imágenes Muestra un continuo nacional de imágenes de satélite, formado por alrededor de 811 imágenes de 60 por 60 kilómetros, con resolución espacial de 2.5 metros. Mapas dinámicos Le permite explotar la base de datos agropecuaria y pesquera SIACON para generar sus propios mapas tematizados, seleccionando áreas específicas y manipulando capas de datos para ellas. Zonas áridas Sistema que ofrece información sobre las zonas climáticas en México, poniendo énfasis en los productos no maderables característicos de las zonas áridas. Infraestructura del sector agroalimentario Le presenta información...
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Synopsis: Recent reports clearly indicate that odor emitted from concentrated livestock production facilities in the Midwest of the US is a significant social problem that negatively impacts rural and state economies, human health, and the quality of rural life. A potential incremental approach to dealing with livestock odor is the use of shelterbelts arranged in strategic designs near and within livestock facilities. This review outlines the various ways that shelterbelts can be effective technology which biophysically mitigates odor thereby reducing social conflict from odor nuisance. The biophysical potential of shelterbelts to mitigate livestock odor arises from the tree/shrub impacts on the central characteristics...
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We used field studies and imaging spectroscopy to investigate the effect of grazing on vegetation cover in historically grazed and ungrazed high-mesa rangelands of the Grand Staircase?Escalante National Monument, Utah, USA. Airborne hyperspectral remote sensing data coupled with spectral mixture analysis uncovered subtle variations in the key biogeophysical properties of these rangelands: the fractional surface cover of photosynthetic vegetation (PV), nonphotosynthetic vegetation (NPV), and bare soil. The results show that a high-mesa area with long-term grazing management had significantly higher PV (26.3%), lower NPV (54.5%), and lower bare soil (17.2%) cover fractions in comparison to historically ungrazed high-mesa...
Broom snakeweed (Gutierrezia sarothrae [Pursh] Britt. & Rusby) is an aggressive native invasive species that thrives after disturbance in semiarid rangelands of the western United States. A 5-yr (2002?2006) study was initiated following grazing and fire disturbances on an Upland Gravelly Loam ecological site in the sagebrush steppe of northern Utah, to evaluate broom snakeweed invasion in different plant communities. The study site originally had two plant communities: a sagebrush/ bunchgrass community that received alternate-year, fall cattle grazing, and was dominated by bluebunch wheatgrass (Elymus spicatus) and an open stand of Wyoming big sagebrush (Artemisia tridentata subsp. wyomingensis), and a sagebrush...
The desert/grassland biome transition zone in central New Mexico provides an important region for testing species differences to changing environmental conditions and various land management practices. Interactions of black grama (Bouteloua eripoda) and blue grama (Bouteloua gracilis) significantly affect the resultant plant community and its influence on system structure and function. Black grama demonstrated higher productivity, especially after wet years, and this species has increased its dominance during the 20-year period since livestock grazing was removed. While black grama can alter the previous pattern of overgrazing and desertification in this transition zone, our experiments demonstrated that it was...
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The RMU_UNIT feature class depicts the boundaries of the range allotments, general resource areas, and wild horse and burro territories on the Tonto National Forest and is part of the USFS Southwestern Region Core Data Project. This project is designed to generate and maintain 15 vertically integrated resource data layers which are standardized across the Southwestern Region. These 15 layers are derived from a Master Arc coverage which maintains vertical integration.The RMU_UNIT feature class depicts the boundaries of the range allotments, general resource areas, and wild horse and burro territories on the Prescott National Forest and is part of the USFS Southwestern Region Core Data Project. This project is designed...
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The euclidean distance to roads from the USFS grazing allotments was calculated to determine which grazing allotments had the fewest roads in proximity.
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The sagebrush rangelands of the Great Basin provide crucial habitat for a diversity of wildlife, including the pronghorn and the greater sage-grouse. These water-limited, highly-managed ecosystems have already been degraded by wildfires, the expansion of invasive grasses, and livestock grazing, and are expected to experience additional stress as climate and land use conditions change. Effective management of sagebrush ecosystems in the future will require the ability to understand and predict these future changes. To address this need, researchers will identify historical rates and causes of vegetation change in shrubland ecosystems, then use this information to develop potential future climate and land use scenarios...
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This is a spatially-explicit state-and-transition simulation model of rangeland vegetation dynamics in southwest South Dakota. It was co-designed with resource management partners to support scenario planning for climate change adaptation. The study site encompasses part of multiple jurisdictions, including Badlands National Park, Buffalo Gap National Grasslands, and Pine Ridge Indian Reservation. The model represents key vegetation types, grazing, exotic plants, fire, and the effects of climate and management on rangeland productivity and composition (i.e., distribution of ecological community phases). See Miller et al. (2017) for further details. The model was built using the ST-Sim software platform (www.apexrms.com/stsm)....
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The Sevilleta LTER supports a long-term, integrated, interdisciplinary research program addressing key hypotheses on pattern and process in aridland ecosystems. Sevilleta LTER research includes studies in desert grassland and shrubland communities, and riparian and mountain forests emphasizing pulse driven processes in space and time. Key drivers (e.g., climate, fire, water, resource availability) govern dynamics in each landscape component. Our focus on how biotic and abiotic drivers affect spatial and temporal dynamics of aridland ecosystems allows us to conduct long-term research that addresses important basic theories and yet has significant relevance to regional, national and international priorities. The...
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Grasslands of the Sky Islands region once covered over 13 million acres in southeastern Arizona and adjacent portions of New Mexico, Sonora, and Chihuahua. Attempts to evaluate current ecological conditions suggest that approximately two thirds of these remain as intact or restorable grassland habitat. These grasslands provide watershed services such as flood control and aquifer recharge across the region, and continue to support dozens of species of concern. Prioritizing conservation interventions for these remaining grassland blocks has been challenging. Reliable data on condition and conservation value of grasslands in the region have not been systematically summarized. State and national boundaries further complicate...
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The Pacific Southwest Region has geospatial datasets available for download from this website. These datasets are zipped personal or file geodatabases* created using ESRI ArcGis 10.0 software. Additional descriptive information as well as data steward contact information, for each geodatabase, can be found under the metadata link. These metadata files meet the Federal Geospatial Data Committee standards for structure and content.
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Synopsis: Researchers measured the effects of grassland amount and fragmentation on upland and wetland songbird and duck densities and nest success across 16 landscapes in southern Alberta. By comparing these landscape-level effects with local-scale responses, including distance to various edges and vegetation characteristics, the study demonstrated that few species were in fact influenced by grassland amount or fragmentation. In contrast, distance to edge and local vegetation characteristics had significant effects on densities and nest success of many species. Landscape level effects were much less apparent when local characteristics were included in the models. Therefore, researchers concluded that local habitat...
We investigated the influence of long-term (56 years) grazing on organic and inorganic carbon (C) and nitrogen (N) contents of the plant-soil system (to 90 cm depth) in shortgrass steppe of northeastern Colorado. Grazing treatments included continuous season-long (May-October) grazing by yearling heifers at heavy (60-75% utilization) and light (20-35% utilization) stocking rates, and nongrazed exclosures. The heavy stocking rate resulted in a plant community that was dominated (75% of biomass production) by the C4 grass blue grama (Bouteloua gracilis), whereas excluding livestock grazing increased the production of C3 grasses and prickly pear cactus (Opuntia polycantha). Soil organic C (SOC) and organic N were not...
Invasion of natural ecosystems by exotic plant species is a major threat to biodiversity. Disturbance to native plant communities, whether natural or management induced, is a primary factor contributing to successful invasion by exotic plant species. Herbivory by both wild and domestic ungulates exerts considerable impact on structure and composition of native plant communities. Intensive herbivory by ungulates can enhance exotic plant invasion, establishment, and spread for three reasons: (1) many exotic plants are adapted to ground disturbances such as those caused by ungulate feeding, trampling, and movements; (2) many exotic plants are adapted for easy transport from one area to another by ungulates via endozoochory...
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Wild Utah Project provides scientific research, technical support including the development of ecological assessment methods and conservation tools, and computer mapping analyses using Geographic Information Systems (GIS) to land managers, Citizen Activists and other conservation partners. Wild Utah Project fills a critical niche here in Utah and the intermountain West, by providing the scientific support needed to shape regional land use in a way that restores native wildlife, maintains ecological integrity, expands wilderness, protects biodiversity, and provides for ecosystem resilience in the face of climate change.
map background search result map search result map Grazing Allotments for the BLM Buffalo Field Office, Wyoming at 1:24,000 Grazing Allotments for the BLM Lander Field Office, Wyoming Wild Utah Project Changes in Vegetation Structure after Long-term Grazing in Pinyon-Juniper Ecosystems: Integrating Imaging Spectroscopy and Field Studies Grazing Allotments for the BLM Kemmerer Field Office, Wyoming Mitigating swine odor with strategically designed shelterbelt systems: a review. A multi-scale analysis of avian response to habitat amount and fragmentation in the Canadian dry mixed-grass prairie. Sevilleta LTER Sustaining the Grassland Sea Bureau of Land Management California GeoSpatial Data Downloads Información Geoespacial USDA Forest Service Pacific Southwest Region Geospatial Data State-and-transition simulation model of rangeland vegetation in southwest South Dakota (1969-2050) Identifying Historical Drivers of Vegetation Change to Inform Future Management of Federal Lands in the Northern Great Basin BLM REA SOD 2010 Grazing Allotments on the Tonto National Forest BLM REA NGB 2011 Distance to Roads in USFS Grazing Allotments Sevilleta LTER BLM REA SOD 2010 Grazing Allotments on the Tonto National Forest Identifying Historical Drivers of Vegetation Change to Inform Future Management of Federal Lands in the Northern Great Basin State-and-transition simulation model of rangeland vegetation in southwest South Dakota (1969-2050) Changes in Vegetation Structure after Long-term Grazing in Pinyon-Juniper Ecosystems: Integrating Imaging Spectroscopy and Field Studies Grazing Allotments for the BLM Kemmerer Field Office, Wyoming Grazing Allotments for the BLM Buffalo Field Office, Wyoming at 1:24,000 Grazing Allotments for the BLM Lander Field Office, Wyoming Sustaining the Grassland Sea A multi-scale analysis of avian response to habitat amount and fragmentation in the Canadian dry mixed-grass prairie. Wild Utah Project BLM REA NGB 2011 Distance to Roads in USFS Grazing Allotments Bureau of Land Management California GeoSpatial Data Downloads USDA Forest Service Pacific Southwest Region Geospatial Data Información Geoespacial Mitigating swine odor with strategically designed shelterbelt systems: a review.