Effects of Nitrogen-Fixing Shrubs in Washington and Coastal California1

摘要: Abstract Open grasslands in California and Washington are being invaded by two closely related European shrubs, French broom Scotch broom, that considered among the most invasive damaging of wildland species those habitats. In this study, we present evidence their effects on soil nitrogen (N) implications for restoration. Using natural abundance 15N signatures leaves, show N fixation brooms varies across sites may depend a suite site-specific factors. Nonetheless, both Washington, observe up to twofold increase availability, as assayed laboratory. Across range sites, determined burning decreases total nearly 40%. We found have simultaneous effect decreasing seedbank 68% after one burn. separate experiment, removed added sawdust test whether N-immobilization would help slower growing native perennial grasses com...