Open Access. Powered by Scholars. Published by Universities.®
- Publication Type
- File Type
Articles 1 - 2 of 2
Full-Text Articles in Life Sciences
Forest Densification Over 85 Years In A Sierra Nevada Mixed-Conifer Forest Decreases Conifer Regeneration And Limits Survival, Marissa A. Vossmer
Forest Densification Over 85 Years In A Sierra Nevada Mixed-Conifer Forest Decreases Conifer Regeneration And Limits Survival, Marissa A. Vossmer
Master's Theses
Forest densification in response to a century of fire suppression in Sierra Nevada mixed conifer forests has decreased conifer regeneration and survival. Increases in overstory biomass and decreases in canopy heterogeneity, along with decreases in shrub cover in the understory, has created unfavorable establishment site conditions for conifer species. Establishment site conditions are key in promoting germination and establishment of conifers seeds and in determining the survival of these seedlings into the overstory. These changes in establishment site suitability resulting from the removal of disturbance from these forests has decreased conifer regeneration and survival into other age classes. In Sierra …
Ecological And Organic Life Safety Concerns Of Hfo-1234yf, Alberni V. Ruiz
Ecological And Organic Life Safety Concerns Of Hfo-1234yf, Alberni V. Ruiz
STAR Program Research Presentations
While at NOAA my research was directed by the inquiry of whether or not HFO-1234yf, a new compound being introduced into coolant system and replacing greenhouse gases HFC, is harmful to organic life. Using the computer program Matlab I was able to develop figures that represented the concentration of HFO-1234yf (HFO) in 12 different tower locations throughout the country. Comparing and contrasting concentrations of this HFO compound at each site led me to the question the possible harmful side effects this compound could bring to organic life due to the fact that concentration levels are increasing, with one factor being …