Monitoring of vegetation after directed fires in the savannas of the leeward coast of la Réunion, Réunion island, 2018-2021

As part of the establishment of controlled fires in the savannas of Cap La Houssaye on Réunion Island, to fight against the shrub invasion of two exotic species Leucaena leucocaphala and Vachellia farnesiana, 40 permanent plots of 2 X 50 m have been installed, named SAV1 to SAV40. A botanical inventory was carried out in these 40 plots. Monthly vegetation monitoring was carried out in 10 plots (SAV 7, 8, 9, 10, 17, 11, 12, 18, 19 and SAV 20) between 2016 and 2018 (T0: November 2016 to T18: July 2018). The impact of two prescribed fires on vegetation in November 2016 and November 2017 could be followed. The abundance, the diversity, the phenology, the height of plants, the presence of resprouts after fire were reported. In the framework of this monitoring, forage quality measurements by infrared spectrometry, seed bank germination monitoring, physico-chemistry soil analysis were also carried out. Floristic characterization and study of the structure of the vegetation in 15 plots located (at 253 m: SAV 7, 8, 9, 10, 17; at 185 m: SAV 31, 32, 33, 34, 35; at 26 m: SAV 36, 37, 38, 39, 40) along a short altitudinal gradient could be conducted. A comparative study between botanical field surveys and photogrammetry in drone imagery of this savanna vegetation was also carried out on the plots SAV 31 to SAV 35 between June and november 2020. In this archive, the data obtained and associated metadata during this project are provided. ACKOWLEDGEMENTS This work could not have been achieved without the help on the field of local biodiversity managers Parc National de La Réunion, Conservatoire du Littoral, Cirad, Université de La Réunion, NGO, colleagues and dynamic students. This study lead was funded by Fondation de France (2018-2021) for the project "Savannas of the leeward coast in La Réunion: an interdisciplinary and experimental approach for knowledge and management of littoral environments".

为在留尼汪岛拉乌塞耶角的稀树草原开展受控火烧以抵御两种外来物种银叶金合欢（Leucaena leucocaphala）和阿拉伯金合欢（Vachellia farnesiana）的灌木入侵，研究团队设置了40个2×50米的永久样地，编号为SAV1至SAV40。针对上述40个样地开展了植物学调查。
2016年11月（T0）至2018年7月（T18）期间，对其中10个样地（SAV7、8、9、10、17、11、12、18、19及SAV20）进行了月度植被监测，可追踪2016年11月与2017年11月两次计划性火烧对植被的影响。研究记录了植被丰度、物种多样性、物候期、植株高度以及火烧后萌蘖株的发生情况。
在本次监测框架内，还开展了红外光谱法饲草品质测定、种子库萌发监测以及土壤理化性质分析。此外，针对沿短海拔梯度分布的15个样地开展了植物区系特征分析与植被结构研究，这些样地分别位于海拔253米处（SAV7、8、9、10、17）、185米处（SAV31、32、33、34、35）及26米处（SAV36、37、38、39、40）。
2020年6月至11月期间，研究团队还针对SAV31至SAV35样地开展了植物学野外调查与无人机摄影测量的对比研究。本数据集档案收录了本项目获取的全部数据及相关元数据。

致谢
本研究得以顺利完成，离不开留尼汪国家公园（Parc National de La Réunion）、海岸保护协会（Conservatoire du Littoral）、Cirad、留尼汪大学（Université de La Réunion）、当地非政府组织、同仁及积极参与的学生们的野外协助。本研究由法国基金会（Fondation de France）于2018-2021年间资助，资助项目名称为"Savannas of the leeward coast in La Réunion: an interdisciplinary and experimental approach for knowledge and management of littoral environments"。