Individual study: Autumn burning to maintain remnant wet prairies benefits the endangered Bradshaw's desert parsley Lomatium bradshawii and other early flowering species in Willamette Valley, Oregon, USA
Pendergrass K.L., Miller P.M., Kauffman J.B. & Kaye T.N. (1999) The role of prescribed burning in maintenance of an endangered plant species Lomatium bradshawii. Ecological Applications, 9, 1420-1429
Less than 1% of prairie present prior to Euro-American settlement remains in Willamette Valley, Oregon (northwest USA). Responses of the endangered Bradshaw's desert parsley Lomatium bradshawii (a perennial herb) to prescribed autumn burns for maintaining remnant wet prairies were evaluated in two areas of the Valley. As it is spring-flowering, this suggests that L. bradshawii might respond positively to autumn season burns.
Burning initially enhanced schizocarp production at both sites; schizocarps declined 1-2 years after burning but remained much higher than in controls until 1996. Overall, L. bradshawii foliar crown area, height, umbellets and number of schizocarps per plant initially responded positively to burning, but increases were not consistent across years or sites. Burning accentuated differences in L. bradshawii size and reproductive capacity between the sites and differentially affected recruitment and density.