abstract. rangeland vegetation dynamics encompass all processes of changes in vegetation composition and structure over time. investigating the rangeland ecosystem dynamics makes it possible to determine the effects of climatic and management conditions on qualitative and quantitative changes of the vegetation in a specific period of time. accordingly, data collection and measurements for evalu...

rangelands encompass 55% of iran's territory. monitoring of such resources is inevitable due to dynamic behavior and extremely high extension. scanning of land resources data by satellites facilitates monitoring the rangelands. this research was carried out to study the relationships of vegetation indices derived from irs liss-iii data with vegetation cover of tange sayyad region in the ch...

Managing vast federal public lands governed by multiple land use policies creates challenges when demographic data on at-risk species are lacking. The U.S. Bureau of Land Management Cedar City Field Office used this project in the Black Mountains (Utah) to inform vegetation management supporting greater sage-grouse and Utah prairie dog planning. Ecological systems were mapped from satellite rem...

The principal drivers of Grassland Biome conversion and degradation in South Africa include agricultural intensification, plantation forestry, urban expansion mining, together with invasive non-native plants insidious rural sprawl. This biome is poorly conserved dire need restoration, an ecologically centred practice gaining increasing traction given its wide application to people biodiversity ...

In the mixed C3/C4 grassland of southern Great Plains, United States, invasive woody legume, honey mesquite (Prosopis glandulosa), affects grass production and composition differently beneath canopy (subcanopy) than in spaces between trees (intercanopy) due part to dominant presence C3 Texas wintergrass (Nassella leucotricha) soil enrichment from N-fixation by mesquite. This arrangement, unlike...

Kentucky bluegrass (Poa pratensis L.; hereafter referred to as bluegrass) is an invasive perennial grass that has become naturalized throughout the entire United States. This species effective competitor and produces abundant litter, which in turn creates a thick thatch layer. In northern Great Plains, fire grazing are management tools for reducing layer, promoting expression of native grasses ...

Establishing an effective restoration program requires baseline genetic information to make sound decisions for seed increase and transfer. For many plants this is lacking, especially among native forbs that are critical pollinator health. Erigeron speciosus a widespread, perennial forb occupying montane environments in the western United States Canada. This species important fostering diversit...

The importance of species richness for repelling exotic plant invasions varies from ecosystem to ecosystem. Thus, in order to prioritize conservation objectives, it is critical to identify those ecosystems where decreasing richness will most greatly magnify invasion risks. Our goal was to determine if invasion risks greatly increase in response to common reductions in grassland species richness...