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Fire does not change sprouting nor flowering, but affects fruiting phenology in a Neotropical savanna community
Flora ( IF 1.9 ) Pub Date : 2021-07-28 , DOI: 10.1016/j.flora.2021.151901
Adriano Valentin-Silva 1 , Vinícius Nunes Alves 2 , Priscila Tunes 1 , Elza Guimarães 3
Affiliation  

In fire-prone ecosystems, such as savannas, fire has been a common event for thousands of years. In these biomes, phenology is a functional trait characterizing the responses of plant communities to fire. In this study, we aimed to evaluate the effects of fire on the period of occurrence, seasonality, and number of species expressing vegetative and reproductive phenophases (sprouting, flowering, and fruiting) in a South American savanna community. We burned experimental plots in 2013, and during the subsequent year, we performed monthly evaluations of the presence and absence of vegetative and reproductive structures in 44 species of angiosperms in the control and burned plots. We described plant phenology at two levels: (i) considering all sampled plant species together (community); and (ii) separately considering the species found in the herbaceous-subshrub and shrub-tree layers (vegetation strata). We analyzed the data using circular statistics and generalized linear mixed models. At the community level, fire did not alter the mean period of occurrence of vegetative and reproductive phenophases; however, we observed changes in fruiting seasonality, which were mainly caused by the changes occurring in the shrub-tree layer. Except for those found in the shrub-tree layer, more species expressed the analyzed phenophases after fire compared to the “control” treatment. This study provides information regarding the responses of plants to burning at the end of the dry season, when most anthropogenic fires occur. Additionally, according to climate change predictions, the Southern Hemisphere is expected to experience longer dry seasons, which may contribute to an increased frequency of anthropogenic fires. Therefore, this phenological information can motivate subsidies that are important for the conservation of this biome and management plans related to the prescription of fires.



中文翻译:

火不会改变发芽或开花,但会影响新热带稀树草原群落的结果物候

在热带草原等易发生火灾的生态系统中,数千年来,火灾一直是常见事件。在这些生物群落中,物候学是表征植物群落对火的反应的功能特征。在这项研究中,我们旨在评估火灾对南美稀树草原群落中表达营养和繁殖物候期(发芽、开花和结果)的物种的发生期、季节性和数量的影响。我们在 2013 年烧毁了实验地块,在接下来的一年中,我们每月对对照和烧毁地块中 44 种被子植物的营养和生殖结构的存在与否进行评估。我们在两个层面描述了植物物候:(i) 将所有采样的植物物种一起考虑(群落);(ii) 分别考虑草本-亚灌木和灌木-乔木层(植被层)中发现的物种。我们使用循环统计和广义线性混合模型分析数据。在社区层面,火没有改变营养和繁殖物候期的平均发生期;然而,我们观察到结果季节性的变化,这主要是由灌木-乔木层发生的变化引起的。除了在灌木树层中发现的那些,与“对照”处理相比,更多的物种在火灾后表达了分析的物相。这项研究提供了有关植物在旱季结束时对燃烧的反应的信息,此时大多数人为火灾发生。此外,根据气候变化预测,预计南半球将经历更长的旱季,这可能导致人为火灾发生频率增加。因此,这种物候信息可以激发对保护该生物群落和与火灾处方相关的管理计划很重要的补贴。

更新日期:2021-08-05
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