The variation in miserotoxin concentration (percent dry weight) of timber milkvetch (Astragalus miser var. serotinus) was ascertained for 19 sites throughout British Columbia. Determinations were based on recently developed methods of micro-isolation and derivatization of miserotoxin from fresh-frozen timber milkvetch samples. With the exception of one site, timber milkvetch located in fescue grassland areas yielded the highest miserotoxin values (5.8 to 7.3%); whereas the lowest peaks (3.1 to 4.3%) were recorded in the medium-canopied forests of the Douglasfir-pinegrass community. Subalpine, savannah, parkland, and semiopen areas of the montane forest exhibited intermediate miserotoxin maxima (4.3 to 5.8%). The data for 1973 suggest that grazing should be avoided in the fescue grasslands in spring and minimized in exposed forest areas. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.