Bud damage from controlled heat treatments in Quercus garryana
| Authors: | Dave H. Peter, James K. Agee, Douglas G. Sprugel |
| Year: | 2009 |
| Type: | Scientific Journal |
| Station: | Pacific Northwest Research Station |
| DOI: | https://doi.org/10.1007/s00468-008-0287-7 |
| Source: | Trees DOI: 10.1007/s00468-008-0287-7 |
Abstract
Quercus garryana habitats are increasingly being managed with prescribed fire, but acorn dependent wildlife might be adversely affected if fires damage acorn crops. We examined one way that fire might affect subsequent acorn crops: through direct heating and damage of buds containing the following year's floral organs. We measured internal bud temperatures during controlled time and temperature treatments, described damage to heated buds at the tissue and cellular levels and quantified spring flowering to assess the consequences of the treatments. We found that internal bud temperature was logarithmically related to exposure time and linearly related to treatment temperature. Our experiments account only for radiative, not convective heating, but suggest that fires might produce sublethal effects that affect flowering and acorn crops. Q. garryana's large buds possess an internal organ arrangement well suited to minimizing heat damage.