Post-fire flowering (PFF) species resprout, flower and disperse seeds within weeks after fire. This may be an important strategy to recruit new individuals and colonize the gaps opened by fire. The seeds released in the post-fire environment may interact with byproducts derived from plant burning, and the resulting ash may have compounds that can promote the germination of various seeds, particularly those with permeable coats. In the Cerrado ecoregion, PFF is a strategy commonly observed in the species of the ground layer, but their seeds are rarely investigated. So, we examined the quality and the germination of the seeds of 13 species that disperse seeds within 3 months after fire. We estimated the amount of empty, filled and predated seeds for each species, and tested the germination with or without ash. There was a clear separation in seed quality as dicots produced 35–75% filled seeds but grasses <15%. Pre-dispersal predation was only observed for dicots (<10%). Ash stimulated the germination of two out of the three dormant species but inhibited the germination of three non-dormant species. Overall, the seeds produced in response to fire are an important source of genetic variability in an ecosystem that has resprouting as the main persistence strategy. As most species have non-dormant seeds, ash may only be important to stimulate the germination of few PFF species. Even so, ash can be completely washed away by rains before seeds are dispersed and may not have an effect under field conditions.

中文翻译：

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塞拉多火后开花物种的种子生态学

火灾后开花 (PFF) 物种在火灾后数周内重新发芽、开花和散播种子。这可能是招募新个体和殖民火烧开的缺口的重要策略。在火后环境中释放的种子可能与植物燃烧产生的副产品相互作用，产生的灰烬可能含有可以促进各种种子发芽的化合物，尤其是那些具有渗透性外皮的种子。在 Cerrado 生态区，PFF 是一种常见于地层物种的策略，但很少研究其种子。因此，我们检查了 13 种在火后 3 个月内散播种子的种子的质量和发芽情况。我们估计了每个物种的空种子、饱满种子和早熟种子的数量，并测试了有无灰烬的发芽情况。双子叶植物产生 35-75% 的饱满种子，但禾草 <15%，种子质量明显不同。仅在双子叶植物 (<10%) 中观察到预分散捕食。灰刺激了三种休眠物种中两种的萌发，但抑制了三种非休眠物种的萌发。总的来说，在以重生为主要持久性策略的生态系统中，因火而产生的种子是遗传变异的重要来源。由于大多数物种都有非休眠种子，灰烬可能只对刺激少数 PFF 物种的萌发很重要。即便如此，在种子散布之前，灰烬可以被雨水完全冲走，在田间条件下可能不会产生影响。灰刺激了三种休眠物种中两种的萌发，但抑制了三种非休眠物种的萌发。总的来说，在以重生为主要持久性策略的生态系统中，因火而产生的种子是遗传变异的重要来源。由于大多数物种都有非休眠种子，灰烬可能只对刺激少数 PFF 物种的萌发很重要。即便如此，在种子散布之前，灰烬可以被雨水完全冲走，在田间条件下可能不会产生影响。灰刺激了三种休眠物种中两种的萌发，但抑制了三种非休眠物种的萌发。总的来说，在以重生为主要持久性策略的生态系统中，因火而产生的种子是遗传变异的重要来源。由于大多数物种都有非休眠种子，灰烬可能只对刺激少数 PFF 物种的萌发很重要。即便如此，在种子散布之前，灰烬可以被雨水完全冲走，在田间条件下可能不会产生影响。灰烬可能只对刺激少数 PFF 物种的萌发很重要。即便如此，在种子散布之前，灰烬可以被雨水完全冲走，在田间条件下可能不会产生影响。灰烬可能只对刺激少数 PFF 物种的萌发很重要。即便如此，在种子散布之前，灰烬可以被雨水完全冲走，在田间条件下可能不会产生影响。