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Formation And Fate Of Methyltin Compounds In The Great Bay Estuary (New Hampshire), Anne M. Falke
Formation And Fate Of Methyltin Compounds In The Great Bay Estuary (New Hampshire), Anne M. Falke
Doctoral Dissertations
Methyltin compounds (MeSn), which are not of anthropogenic origin, are common in estuaries, particularly in the marsh grass Spartina alterniflora. During the 1989 growing season, S. alterniflora leaves collected from three locations in the Great Bay Estuary were analyzed for MeSn and inorganic tin by hydride generation/atomic absorption spectrophotometry (HG-AAS). Total MeSn concentrations showed a sharp increase early in the season, reaching a maximum on May 23, then gradually decreased. Statistical calculations verified that date was a significant contributor to the observed variance, while location was not.
Two years later the seasonal study was expanded to include below ground portions …
Global Terrestrial Biogeochemistry: Perturbations, Interactions, And Time Scales, Bobby H. Braswell
Global Terrestrial Biogeochemistry: Perturbations, Interactions, And Time Scales, Bobby H. Braswell
Doctoral Dissertations
Global biogeochemical processes are being perturbed by human activity, principally that which is associated with industrial activity and expansion of urban and agricultural complexes. Perturbations have manifested themselves at least since the beginning of the 19th Century, and include emissions of CO$\sb2$ and other pollutants from fossil fuel combustion, agricultural emissions of reactive nitrogen, and direct disruption of ecosystem function through land conversion. These perturbations yield local impacts, but there are also global consequences that are the sum of local-scale influences.
Several approaches to understanding the global-scale implications of chemical perturbations to the Earth system are discussed. The lifetime of …