AUTHOR=Zhang Peixin , Yang Minfang , Lu Jing , Jiang Zhongfeng , Zhou Kai , Xu Xiaotao , Wang Lei , Wu Li , Zhang Yuchan , Chen Huijuan , Zhu Xuran , Guo Yanghang , Ye Huajun , Shao Longyi , Hilton Jason TITLE=Different wildfire types promoted two-step terrestrial plant community change across the Triassic-Jurassic transition JOURNAL=Frontiers in Ecology and Evolution VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2024.1329533 DOI=10.3389/fevo.2024.1329533 ISSN=2296-701X ABSTRACT=

Frequent wildfires associated with emplacement of the Central Atlantic Magmatic Province (CAMP) are thought to have been important drivers of two significant changes in terrestrial plant communities and diversity during the Triassic-Jurassic Mass Extinction (TJME, ca. 201.51 Ma). ​However, it remains to be investigated whether these two changes are potentially related to different wildfire types. To better understand this relationship, we used a new method to reanalyze fossil pollen and spores across the Triassic-Jurassic transition in the Jiyuan Basin from the North China Plate. Results show that two peaks in wildfire frequency experienced different types of wildfires, with each linked to significant changes in plant communities and diversity losses. In the first wildfire peak, canopy fires dominated and are accompanied by significant losses of canopy forming plants, while in the second wildfire peak, ground cover fires dominated accompanied by significant losses of ground cover plants. ​Changes in atmospheric humidity conditions were an important control on the two different wildfire peaks. Relatively humid climatic conditions corresponded to the prevalence of canopy fires and hindered the spread and development of ground cover fires in wet surface conditions. Conversely, relatively arid climatic conditions corresponded with the prevalence of ground cover fires in dry surface environments. Our results provide a potential relationship between terrestrial plant communities and wildfire types, which is important to further understanding of terrestrial environmental and floral changes driven by Large Igneous Provinces.