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首页> 外文期刊>Natural areas journal >Vegetation Dynamics after Spring and Summer Fires in Red and White Pine Stands at Voyageurs National Park
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Vegetation Dynamics after Spring and Summer Fires in Red and White Pine Stands at Voyageurs National Park

机译：Voyageurs国家公园红松和白松林分春季和夏季火灾后的植被动态

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摘要

Conducting dormant season or springtime prescribed fire treatments has become a common practice in many regions of the United States to restore ecosystems to their natural state. Despite the knowledge that historically, fires often occurred during the summer, the application of summer burns has been deterred, in part, by a lack of understanding of fire season effects on vegetation. We explored the differences in fire effects between spring and summer burns at Voyageurs National Park, Minnesota. The fire season effects on the ground layer vegetation were clearly different among the treatments: pre-burn, spring, and summer. Vegetation composition of pre-burn and after spring fires was similar, but differed significantly from the summer fires. Spring fires propagated the same species that were present prior to the fire, whereas summer fires promoted a new suite of species through the germination of seedbank and high seed dispersal species. Cover and richness of seed bank and intolerant species were greatest after the summer fires, which contributed to the peak in richness found across all reproductive and tolerance attributes five years after these fires. Post summer fire composition showed shifts in composition through time. Substantial differences in the effects of burn seasonality on ground layer vegetation should be considered in long term restoration efforts to help maintain species diversity in red and white pine forest ecosystems.
机译：在美国许多地区，进行休眠季节或春季规定的防火处理已成为在美国许多地区恢复生态系统至自然状态的普遍做法。尽管历史上知道火灾经常发生在夏季，但由于对火灾季节对植被的影响缺乏了解，阻止了夏季灼伤的发生。我们探索了明尼苏达州Voyageurs国家公园春季和夏季灼伤之间火势的差异。在不同的处理方式中，火季对地面植被的影响明显不同：预燃，春季和夏季。燃烧前和春季火灾后的植被组成相似，但与夏季火灾有显着差异。春季大火传播了与大火之前相同的物种，而夏季大火则通过种子库和高种子扩散物种的发芽促进了一组新物种。夏季大火之后，种子库和不耐性物种的覆盖度和丰富度最大，这促使大火发生五年后所有生殖和耐受性属性的丰富度达到峰值。夏季后的大火成分随时间变化。在长期的恢复工作中，应考虑烧伤季节对地表植被的影响存在实质性差异，以帮助维持红松和白松林生态系统中的物种多样性。

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