Understanding the human impact on Akita-sugi cedar (Cryptomeria japonica) forest in the late Holocene through pollen analysis of annually laminated sediments from Ichi-no-Megata,
Understanding the human impact on Akita-sugi cedar (Cryptomeria japonica) forest in the late Holocene through pollen analysis of annually laminated sediments from Ichi-no-Megata,
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通过对 Ichi-no-Megata 每年层压沉积物的花粉分析，了解全新世晚期人类对秋田杉（Cryptomeria japonica）森林的影响，
DOI：
10.1007/s00334-016-0570-2
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发表时间：
2016
影响因子：
2.5
通讯作者：
Yoshinori Yasuda
中科院分区：
文献类型：
--
作者：
Junko Kitagawa;Yoshimune Morita;Miroslaw Makohonienko;Katsuya Gotanda;Kazuyoshi Yamada;Hitoshi Yonenobu;Ikuko Kitaba;Yoshinori Yasuda
秋田杉（Cryptomeria japonica，生长在秋田的日本雪松）森林是日本最重要的商业价值木材之一。从历史上看，这些森林遭到了严重的开发，尽管现在它们的一些部分得到了保护。了解森林的详细历史是很重要的，这样才能在未来可持续地利用它们。本研究分析了日本秋田大贺半岛一野megata年度层状湖泊沉积物芯中的花粉，以了解秋田杉木林的历史。基于加速器质谱仪对13种植物大型化石的测年结果，建立了一个年龄深度模型，这些化石从表面到422厘米深，包括Towada-a - tephra和其他著名的事件层。优势花粉类群为绿毛茛属（ecryptomeriaia）和fagus crenatabyad1000。大约在公元前1700年，人们发现了cryptomeria的第一次增长。到了公元1世纪，密林被建立起来。当时，柳杉与落叶树混种，主要是柳杉。crenata。花粉分析发现的证据表明，主要的林地损失发生在11世纪，当时林地被开垦为农业用地。然而，直到16世纪，大量的天然森林仍然存在，此后森林资源枯竭。保护和种植活动后来才开始，但人类对严重饥荒的反应阻止了森林的恢复。饥荒时期过后，剩余的森林恢复到原来的状态，但第二次世界大战后，天然林进一步萎缩，大面积建立了没有落叶树木的人工林。
Akita-sugi (Cryptomeria japonica, Japanese cedar that is grown in Akita) forests are among the most important for commercially valuable timber in Japan. Historically, these forests have been severely exploited, although now some parts of them are conserved. It is important to know the detailed history of the forests in order to utilize them sustainably in the future. This study analyzes the pollen in an annually laminated lake sediment core from Ichi-no-Megata on the Oga peninsula, Akita, Japan, to understand the history of Akita-sugi cedar forests. An age-depth model was developed based on the results of an accelerator mass spectrometer dating of 13 plant macrofossils from the surface to 422 cm in depth, the Towada-a tephra and other well-known event layers. The dominant pollen taxa wereCryptomeriaandFagus crenatabyad1000. The first increase ofCryptomeriawas detected around 1700bc. By the 1st centuryad,Cryptomeriaforest was established. At that time,Cryptomeriawas mixed with deciduous trees, mainlyF. crenata. The pollen analysis found evidence that the main loss of woodland occurred during the 11th centuryad, when forest lands were cleared for agriculture. Substantial natural forests nevertheless remained until the 16th century, after which forest resources were exhausted. Conservation and plantation activities took place later, but human activity in response to severe famines prevented the recovery of the forests. After the famine periods, the remaining forests recovered to their previous condition, but after World War II, the natural forests shrank further and plantation forests without deciduous trees were established over large areas.