Collapse of tropical rainforest ecosystems caused by high-temperature wildfires during the end-Permian mass extinction

被引:12
作者
Jiao, Shenglin [1 ,2 ,3 ]
Zhang, Hua [1 ,2 ]
Cai, Yaofeng [1 ,2 ]
Chen, Jianbo [4 ,5 ]
Feng, Zhuo [4 ,5 ]
Shen, Shuzhong [6 ,7 ]
机构
[1] Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
[2] Chinese Acad Sci, Ctr Excellence Life & Palaeoenvironm, Nanjing 210008, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Yunnan Univ, Inst Palaeontol, Yunnan Key Lab Earth Syst Sci, Yunnan Key Lab Palaeobiol, Kunming 650500, Peoples R China
[5] Yunnan Univ, MEC Int Joint Lab Palaeobiol & Palaeoenvironment, Kunming 650500, Peoples R China
[6] Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China
[7] Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Nanjing 210023, Peoples R China
关键词
polycyclic aromatic hydrocarbons; wildfires; ecological ecosystem collapse; Permian-Triassic transition; Southwest China; POLYCYCLIC AROMATIC-HYDROCARBONS; CRUDE OILS; PALAEO-WILDFIRE; OCEANIC ANOXIA; BASIN; SEDIMENTS; COAL; CHARCOAL; INDICATORS; EMISSIONS;
D O I
10.1016/j.epsl.2023.118193
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The end-Permian mass extinction (EPME) caused significant changes in the marine and terrestrial realms because of global environmental deterioration caused by intensive volcanic activities. Polycyclic aromatic hydrocarbons (PAHs) in sediments are powerful proxies indicating the frequency and intensity of wildfires during the Permian-Triassic (P-T) transition, providing critical information on floral turnovers and paleoclimatic conditions associated with P-T deforestation. In this study, we investigated high-resolution PAHs in a non-marine P-T transitional sequence from the HK-1 drill core at the Lengqinggou section of Southwest China. The consistency of the PAH distribution patterns as well as the positive correlation between the PAH contents in the whole sequence indicates that they are derived from the same source or process. Similarly, multiple PAH ratios (e.g., fluoranthene/(fluoranthene + pyrene)) changed dramatically with generally higher values in the Lopingian, indicating that the PAHs were more likely derived from a pyrogenic source (i.e., high-temperature wildfire events) compared to those in the Lower Triassic. The enrichment of PAHs at the HK-1 drill core in the terrestrial EPME interval indicates that the paleotropical rainforest ecosystem provided sufficient fuel for large-scale high-temperature wildfire combustion events. Furthermore, the extremely low PAH contents in the Lower Triassic indicated a fuel shortage after the mass deforestation, the highly diversified rainforest assemblage disappeared and was replaced with herbaceous, hinterland-like vegetation. The high coronene/phenanthrene ratio and coronene index indicated that although vegetation was scarce, high-temperature burning events were still common in the Lower Triassic, this evidence further supports the vegetation changeover during the P-T transition. These results indicate that intensified high-temperature wildfire combustion events in the paleotropical rainforest in Southwest China occurred because of global warming and aridity caused by intensive volcanic activities during the P-T transition.
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页数:10
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