Florida’s fiery subtropical grasslands: Growth forms, belowground organs, and post-fire recovery strategies

IF 1 4区 生物学 Q3 PLANT SCIENCES Folia Geobotanica Pub Date : 2024-02-03 DOI:10.1007/s12224-024-09440-1
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Abstract

Fire-adaptive traits in plants of tropical and subtropical grassy ecosystems have been the subject of considerable global research, but only recently studied in pyrogenic Florida subtropical grasslands. Plant growth forms, belowground organs, and post-fire recovery strategies were studied for 198 grassland specialists in peninsular Florida. Community types (dry-mesic, mesic, wet-mesic, and wet) were sampled with 1m2 plots along the edaphic-hydrologic gradient and the association between these variables and fire-related plant traits was tested using fourth-corner analysis. Caulescent herbs (43), cespitose graminoids (27), and rosette herbs (31) are the most common growth forms among species sampled. Plants with epigeogenous and hypogeogenous rhizomes dominate the sample plots, including matrix graminoids, shrub geoxyles, and an acaulescent rhizomatous fire-resilient palm (Serenoa repens). Most species (163; 82%) exhibit resprouting, including 30 facultative resprouters and 133 obligate resprouters. All woody rhizomatous species are obligate resprouters, and 35 ephemeral herbaceous species are obligate reseeders. Community type was a better predictor of species abundances than hydrology, however, hydrology was significantly associated with species traits measured, particularly rhizome texture, with woody rhizomes prevalent in all but the wet sites. Belowground organs (xylopodia, geoxylic suffructices) and growth form were associated with frequent fire and phylogeny, suggesting fire regime as a driver of community phylogenetic diversity. Persistence, rapid resilience and co-occurrence of geoxyles align Florida subtropical grasslands with other global geoxyle grasslands. The old-growth, pyrogenic grassy ecosystems of peninsular Florida are the center of geoxyle diversification on the southeastern US coastal plain.

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佛罗里达火热的亚热带草原:生长形式、地下器官和火灾后恢复策略
摘要 热带和亚热带草地生态系统植物的火灾适应性特征一直是全球大量研究的主题,但最近才对佛罗里达亚热带火原草地进行了研究。我们对佛罗里达半岛的 198 种草地专家植物的生长形式、地下器官和火后恢复策略进行了研究。沿气候-水文梯度以 1 平方米的小块对群落类型(干-湿润、中-湿润、湿-湿润和湿润)进行了取样,并使用四角分析法检验了这些变量与火灾相关植物特征之间的关联。茎生草本植物(43 种)、丛生禾本科植物(27 种)和莲座草本植物(31 种)是取样物种中最常见的生长形式。具有外生根状茎和下生根状茎的植物在样本地块中占主导地位,包括基质禾本科植物、灌木地衣和一种无茎根状茎耐火棕榈(Serenoa repens)。大多数物种(163 种,占 82%)都有呼吸生长,其中包括 30 种兼性呼吸生长和 133 种强制性呼吸生长。所有木质根状茎物种都是强制性再发芽物种,35 种短暂性草本物种是强制性再发芽物种。群落类型比水文更能预测物种丰度,但水文与所测得的物种特征,尤其是根状茎质地有显著关联,除潮湿地点外,其他地点都普遍存在木质根状茎。地下器官(木质根茎、地衣)和生长形式与火灾频度和系统发育相关,这表明火灾机制是群落系统发育多样性的驱动因素。佛罗里达亚热带草地与全球其他地貌草地一样,具有持久性、快速恢复能力和共生现象。佛罗里达半岛古老的火原草地生态系统是美国东南部沿海平原地貌多样性的中心。
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来源期刊
Folia Geobotanica
Folia Geobotanica 生物-植物科学
CiteScore
2.40
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: The journal Folia Geobotanica publishes articles in vegetation science, plant ecology and plant systematics, including the topics of temporal community patterns, population and ecosystem ecology, and invasion and conservation ecology. Within the field of plant systematics, Folia Geobotanica welcomes papers on systematic and evolutionary botany, including phylogenetic reconstructions, phylogeographic and biogeographic inferences, studies of microevolutionary processes, taxonomic studies, and broader taxonomic revisions.
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