Journal Title
Title of Journal: Plant Ecol
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Abbravation: Plant Ecology
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Publisher
Springer Netherlands
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Authors: D V Gross J T Romo
Publish Date: 2009/11/10
Volume: 208, Issue: 1, Pages: 137-153
Abstract
Historically fires occurred throughout the year in the Fescue Prairie of Canada but little is known about plant community responses to burning at different times of the year Composition of plant communities was determined annually for 6 years after burning one or three times in a remnant Fescue Prairie in central Saskatchewan A multipleresponse permutation procedure indicated that plant community composition was different in the two burning histories P 0001 and among times of burning P 0001 Variables related to plant community composition after burning were evaluated using Nonmetric Multidimensional Scaling Three gradients explained 86 of the variation in composition of plant communities Environmental conditions leading up to burning and at the time of burning correlated poorly with species composition Differences in composition of plant communities were attributed primarily to burning history cumulative precipitation in the 12 months before sampling cumulative coldstress days in the 12 months before sampling coldstress days in March and April and months since burning Plant communities burned once responded negatively to increasing coldstress days while those burned three times responded positively to coldstress days Cover of Festuca hallii and Symphoricarpos occidentalis was 88 and 350 greater after one burn as compared to three burns whereas cover of Carex obtusata Carex pensylvanica and Elymus lanceolatus was 126 53 and 220 greater after three burns than after one burn Festuca hallii Galium boreale Pulsatilla patens ssp multifida Symphoricarpos occidentalis and Symphyotrichum ericoides had the highest indicator value of a single burn Carex obtusata Elymus lanceolatus and Koeleria macrantha had the greatest indicator values for sites burned three times Longerterm effects of burning history exert a strong influence on plant community composition while shortterm conditions after burning namely precipitation and coldstress days appear important in controlling species responses and composition of plant communities in Fescue PrairieThe authors thank the many people who assisted in conducting the burns during this study We thank Tyler Colberg for assisting in many ways and Judy Haraldson for her dedicated assistance in vegetation sampling Appreciation goes to Kirk Blomquist for providing equipment for burning We also extend our thanks to Professor Yuguang Bai for constructive comments on an earlier version of this paper and to Professor Eric Lamb for advice on statistical analyses
Keywords:
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