Cerrado is a tropical savanna hotspot that is impacted by frequent wildfires, but where many effects of fire still are poorly understood. This is especially true for the herbaceous strata at the community level, in which reproductive efforts are deeply affected by fire. The objectives of this study were the following: evaluate if fire qualitatively and/or quantitatively affects the production of sexual reproductive structures in an open cerrado community; describe fire-stimulated or fire-inhibited flowering and fruiting species; and evaluate the influence of water availability on flowering and fruiting. The number of species with flowers and fruits/m² and the number of reproductive units/m² were sampled in eight 20×20 m² plots in Chapada Diamantina, Brazil. After the first sampling in the beginning of the rainy season (November 2009), the vegetation in four plots was burned and then the eight plots were resampled over five months. Indexes of fire-stimulated and fire-inhibited flowering and fruiting species were calculated. Non-metric multidimensional scaling and cross-correlation analyses were calculated and differences between the burnt and unburnt plots were compared with an analysis of variance. Sexual reproduction was deeply affected by fire, which changed the composition of reproducing species. Profuse reproduction of graminoids (Poaceae) and geophytic herbs classified as fire-stimulated flowering and/or fire-stimulated fruiting species concomitantly occurred with a high increase of water in the burnt soil compared to the unburnt soil in the first two months after the fires. The sexual reproduction of shrubby species was inhibited by fire. In an objective way, 21 species stimulated or inhibited by fire were recorded. Fire also changed the influence of rainfall on reproductive efforts. This study shows quick qualitative and quantitative effects of fire on open cerrado functioning and highlights the necessity of fire management for biodiversity conservation in savannas.

塞拉多（Cerrado）是热带稀树草原的热点地区，经常受到野火的影响，但人们对火的许多影响仍知之甚少。对于社区一级的草本阶层而言尤其如此，因为那里的繁殖努力受到火灾的深远影响。这项研究的目的如下：评估火灾是否在开放的塞拉多社区定性和/或定量地影响性生殖结构的产生；描述受火刺激或受火抑制的开花和结果种类；并评估水分供应对开花结果的影响。与花和水果/米物种的数量²和生殖单元的数目/米²在8 20×20米进行取样²巴西Chapada Diamantina的地块。在雨季开始（2009年11月）进行第一次采样后，烧毁了四个样地中的植被，然后在五个月内对这八个样地进行了重新采样。计算了受火刺激和受火抑制的开花和结果种类的指数。计算了非度量多维标度和互相关分析，并将烧成图和未烧成图之间的差异与方差分析进行了比较。有性繁殖受到火灾的严重影响，从而改变了繁殖物种的组成。在火灾后的头两个月中，与未燃烧的土壤相比，燃烧后的土壤中水分含量高，同时伴随着被归类为受火刺激的开花和/或受火刺激的结果物种的禾本科类禾本科植物和禾本科植物的大量繁殖。火抑制了灌木类物种的有性繁殖。客观地记录了21种受火刺激或抑制的物种。大火还改变了降雨对生殖工作的影响。这项研究显示了火灾对开放式塞拉多功能的快速定性和定量影响，并强调了火灾管理对稀树草原生物多样性保护的必要性。大火还改变了降雨对生殖工作的影响。这项研究显示了火灾对开放式塞拉多功能的快速定性和定量影响，并强调了火灾管理对稀树草原生物多样性保护的必要性。大火还改变了降雨对生殖工作的影响。这项研究显示了火灾对开放式塞拉多功能的快速定性和定量影响，并强调了火灾管理对稀树草原生物多样性保护的必要性。