Abstract
TESTER, J. R. (Department of Ecology and Behavioral Biology, University of Minnesota, Minneapolis, MN 55455). Effects of fire frequency on oak savanna in east-central Minnesota. Bull. Torrey Bot. Club 116: 134-144. 1989.-From 1964 to 1984, prescribed burning experiments were performed on oak (Quercus spp.) forest and oak savanna in east-central Minnesota, USA. Eighty-nine burns were carried out on 9 compartments ranging from 2.6 to 27.5 ha. Intervals between fires varied from 1 to 12 years. Soil pH increased significantly with frequency of burning. Total nitrogen was positively correlated (P < 0.01) with per cent organic matter. Species richness was highest in areas which were burned approximately every 2 years. Different plant functional groups responded differently to frequency of burning. Cover of true prairie grasses increased from less than 5 to about 15 per cent. True prairie forbs showed a significant increase in cover from less than 2 to about 8 per cent with increasing frequency of burning. Density of true prairie shrubs showed a tendency to increase whereas density of non-prairie shrubs and of trees showed tendencies to decrease with increased frequency of fire. Thus, the frequency of prescribed burning strongly influenced vegetative composition and physiognomy as well as soil characteristics.
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Claims 6
Claim · model-written summary
Species richness was highest with burning about every two years.
QuercusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Species richness was highest in areas which were burned approximately every 2 years”
t0“oak savanna”
Claim · model-written summary
True prairie grass cover increased from less than 5 to about 15 percent with burning.
Verbatim
e0“Cover of true prairie grasses increased from less than 5 to about 15 per cent”
Claim · model-written summary
True prairie forb cover increased significantly from less than 2 to about 8 percent as fire frequency increased.
Verbatim
e0“True prairie forbs showed a significant increase in cover from less than 2 to about 8 per cent with increasing frequency of burning”
Claim · model-written summary
True prairie shrub density tended to rise with greater fire frequency.
Verbatim
e0“Density of true prairie shrubs showed a tendency to increase whereas density of non-prairie shrubs and of trees showed tendencies to decrease with increased frequency of fire”
Claim · model-written summary
Non-prairie shrub density tended to fall with greater fire frequency.
Verbatim
e0“density of non-prairie shrubs and of trees showed tendencies to decrease with increased frequency of fire”
Claim · model-written summary
Tree density tended to fall with greater fire frequency.
Verbatim
e0“density of non-prairie shrubs and of trees showed tendencies to decrease with increased frequency of fire”