Phytoliths as an indicator of change in vegetation related to the huge volcanic eruption at 7.3 ka in the southernmost part of Kyushu, southern Japan
Phytoliths as an indicator of change in vegetation related to the huge volcanic eruption at 7.3 ka in the southernmost part of Kyushu, southern Japan
复制标题
DOI：
10.1177/0959683620988057
复制
发表时间：
2021-05-01
期刊：
影响因子：
2.4
通讯作者：
Inoue, Jun
中科院分区：
文献类型：
--
作者：
Hayashi, Naoki;Inoue, Yudzuru;Inoue, Jun
火山爆发可能对邻近的生态系统产生重大影响;然而，人们对火山爆发引起的长期植被变化知之甚少。在这项研究中，我们研究了植硅体记录在多个地点的古土壤在南部九州地区，日本，评估的影响，Kikai火山口喷发7300年前对植被。我们的研究结果表明，在研究区的植被差异之前和之后的喷发。在火山碎屑流分布较厚的地区，火山爆发后，原来的万年青森林被仙女木草原所取代，仙女木草原在该地区占据主导地位至少900年。相比之下，在火山碎屑流影响较小的地区，尽管森林暂时被草原取代，但森林在火山爆发后的几百年内发展和繁荣。这是因为大量的火山碎屑流会摧毁所有的植被，而少量的火山碎屑流会在避难所内留下一些未受影响的森林。我们的研究结果表明，植被变化显着取决于火山碎屑流到达该地区的量，即使在火山碎屑流分布区域。
Volcanic eruptions can have a significant influence on adjacent ecosystems; however, little is known about the long-term vegetation change related to eruptions. In this study, we examined phytolith records in paleosols at multiple sites in the southern Kyushu District, Japan, to assess the influence of the Kikai caldera eruption 7300 years ago on vegetation. Our results show the vegetational difference before and after the eruption in the study region. Specifically, in the area where the pyroclastic flows distributed more thickly, the original evergreen forest was replaced by Andropogoneae grasslands after the eruption, which has been dominating the landscape in this area for at least 900 years. By contrast, in areas only mildly affected by pyroclastic flows, despite the temporary replacement of forest by grassland, the forest developed and flourished within several hundreds of years of the eruption. This is because a large amount of pyroclastic flow would have devastated all of the vegetation, whereas smaller amounts would have left some untouched forest sites within refugia. Our findings suggest that the vegetation varied significantly depending on the amount of pyroclastic flow reaching the area, even within the pyroclastic flow distributed region.