西非Sudanian稀树草原森林在旱季火烧温度、持续时间及对种子萌发的影响 |
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收稿时间: | 16 June 2007 |
Fire temperature and residence time during dry season burning in a Sudanian savanna-woodland of West Africa with implication for seed germination |
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Authors: | Sidzabda Djibril Dayamba Patrice Savadogo Didier Zida Louis Sawadogo Daniel Tiveau Per Christer Oden |
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Institution: | (1) Department of Biological Sciences, Auburn University, Auburn, AL 36849, USA;(2) Folius Consulting, Camp Hill, AL 36850, USA;(3) Center for Forest Sustainability, Auburn University, Auburn, AL 36849, USA |
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Abstract: | Prescribed fire is used in the Sudanian savanna-woodland of West Africa as a forest management tool. An experiment was carried
out to assess the effects of season of burning, and different vertical probe positions on maximum fire temperature and temperature
residence time above 60°C which is considered lethal for plant tissues. Seasons of burning considered were: an early season
fire set at the beginning of the dry season (beginning of December), mid-season fire set at the peak of the dry season (mid-January),
and a late season fire at the end of the dry season (end of March). The effects of these fires on the germination of buried
seeds of three socio-economically valuable tree species were also examined. Results indicated significant differences in maximum
fire temperature and residence time with respect to season of burning and vertical probe position (p < 0.001). The highest and longest lasting temperatures were observed at 20 cm above ground during early fire and at the soil
surface during mid-season and late fires. This, in turn, affected germination responses of seeds buried at different soil
depths. Implications of these findings in the current management practices are discussed. |
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