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Full-Text Articles in Physical Sciences and Mathematics
Probability Of Fire-Stopping Precipitation Events, U.S. Forest Service
Probability Of Fire-Stopping Precipitation Events, U.S. Forest Service
All U.S. Government Documents (Utah Regional Depository)
The possibility that a useful probability for fire stopping precipitation could be developed from historical weather records was investigated.
Preserves At Risk: An Investigation Of Resource Management Strategies, Implications And Opportunities, R. J. Lilieholm
Preserves At Risk: An Investigation Of Resource Management Strategies, Implications And Opportunities, R. J. Lilieholm
Elusive Documents
Human activities already threaten the globe's physical and biological systems. Worldwide, species extinction rates are estimated to be one thousand times what they would be in the absence of human activity (Wilson 1988). Raven (1988) estimates that 25% of the world's plant and animal species existing in 1985 may be extinct by 2015, with most extinctions occurring in tropical regions. While these extinction rates are staggering, global warming would greatly accelerate extinction rates that some scientists believe may already exceed those accompanying the decline of the dinosaurs 65 million years ago (Wolf 1987).
Revegetation Of Disturbed Semiarid Grassland In Canyonlands National Park, Susan B. Goldberg
Revegetation Of Disturbed Semiarid Grassland In Canyonlands National Park, Susan B. Goldberg
Canyonlands Research Bibliography
A grassland restoration project was conducted in Canyonlands National Park on an area recently disturbed due to construction. Two native grasses (Oryzopsis hymenoides and Stipa comata) were seeded with 18 different soil treatments. Stipa density and relative mycorrhizal colonization were measured. None of the soil treatments resulted in significantly greater Stipa density than the control treatment of seeding only plus water. There was very little correlation between Stipa density and mycorrhizal colonization based on the treatments (r2= 0.011 p = 0.05). Three treatments produced 3 to 5 times the VAN colonization as the control including spring cryptobiotic soil crusts, with …