Year: 1991
Type: dissertation
Abstract: Twenty-nine soils were sampled near Lysite and Chalk Bluff, Wyoming, where livestock mortality has resulted from toxic (presumably seleniferous) forage.Ammonium bicarbonatediethylenetriamine-pentaacetic acid (AB-DTPA) extractable selenium concentrations were determined for each soil horizon.Samples of foliage associated with these soils were collected, frozen, later digested in acid, and selenium concentrations determined.Plant species were assigned to one of three groups based on selenium concentrations.Relationships between plant tissue selenium levels and extractable soil selenium levels were statistically evaluated using linear regression and analysis of variance.Independent variables were extractable soil selenium concentrations for half-meter depth increments, average selenium concentration for the profile, and highest selenium concentration in each profile.Regressions were calculated for each group of species at each site.Near Lysite, where extractable soil selenium concentrations were rather low, significant soil/plant relationships were found for the more common, non-indicator species.An AB-DTPA extractable soil selenium concentration of approximately 0.07 Hg Se/g soil (weighted average for soil profile) is correlated with a tissue selenium concentration of 5 Hg/g tissue.As soil depth increases, higher concentrations of extractable soil selenium correlate with threshold toxic vegetation in non-accumulator species.At Chalk Bluff, where soil selenium concentrations were much higher, significant soil/plant relationships were found for selenium accumulator species, but not for non-accumulators.An average AB-DTPA extractable soil selenium concentration of 0.1 μg Se/g soil is correlated with 1900 μg Se/g plant tissue for selenium accumulator species.However, the r^2 for this relationship is only 0.40.
Author: R. A. Prodgers
Language: English
Subfield: Nutrition and Dietetics
Field: Nursing
Domain: Health Sciences
SDGs: Life on land, Zero hunger
Open Access status: green
OpenAlex ID: W2161972843