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Hattori T.,Museum of Nature and Human Actvites | Mnamiyama N.,Museum of Nature and Human Actvites | Iwakiri K.,Iwakiri Environmental Research Coltd | Ishida H.,Museum of Nature and Human Actvites | And 2 more authors.
Humans and Nature | Year: 2010

Species composition and species richness were studied in he Persea type lucidophyllous forests on heir southern distributional limit in Kagoshima, Miyazaki and Kochi prefectures and their northern distributional limit in Niigata, Yamagata, Akita, Miyagi and Iwate prefectures In total, 121 quadrates were investigated. The Persea type lucidophyllous forests were classified into the Fico superbae-Persetum thunbergii Miyawaki 1998, the Araemato ringentis-Peretum thunbergii Miyawaki et al. 1971 and the Polystico-Persetum thunbergii Suzuki et Wada 1949. The Fico superbae-Persetum thunbergii was characterized by the presence of Tachelospermum gracilpes var. lukiuense, Maesa tenera, Psychotria serpens and others, and was distributed on Yakushima and Island Tanegashima Island. The Aaemato ringentis-Persetum thunbergii was characterized by the presence of Ophiopogon ohwii, Trachelospermum asaticum var. intermedium and Rohdea japonica and the absence of the differential species of the Fico superbae-Persetum thunbergii, and was distributed on Kushima, Nchinan, Ashizuri and Muroto. The Polysco-Persetum thunbergii was characterized by the presence of Ardisia japonica, Ophiopogon planiscapus Dryopters erythrosora and Dyopters lacera, and was disbuted in the Tohoku region. These three associations were distributed along the coast The mean number of lucidophyllous elements per quadrate (100m 2), which was indicative of species richness, in he Fico superbae-Persetum thunbergii, the Araemato ringentis-Peretum thunbergii and the Polystico-Persetum thunbergii was 21.4-36.1, 28.6-33.5 and 2.8-10.0, respectively. The lowest species richness of the Polystico-Persetum thunbergii was caused by the salt breeze and the low temperatures in the area where this association was distributed. Source


Katoh S.,Museum of Nature and Human Actvites | Handa K.,Museum of Nature and Human Actvites | Furutani H.,University of Hyogo | Okugishi A.,Museum of Nature and Human Actvites | And 2 more authors.
Humans and Nature | Year: 2010

The Fukuchi Peaty Beds have exposed along the upper reach of the Fukuchi River in the Chugoku Mountains at Shirakuchi, Shio Cy, Hyogo Prefecture. They are composed of organic sandy clay with minor amounts of and, and include a lot of plant fossils Morphology and refractive index of glass shards contained n the beds have revealed they had deposed between 20 and 73 ka. Three AMS- 14C dates from he plant fossils also indicate he deposition had begun at 9,140 o 9,435 cal BP n the early Holocene and continued at least until 8,457 to 8,638 cal BP with a very rapid sedimentation rate of 7 to 16 mm/yr The landslide occurred at Shirakuchi between 9,140 and 9,435 cal BP is thought to be due to either a large earthquake by the Yamasaki fault zone or more probable torential rainfall The debris flow deposits dammed up the Fukuchi River, resulting n an elongate lake about 200-m wide and 500-m long at is maximum. This ancient lake had been bured rapidly with debris supplied from surrounding mountain slopes and plant remains The Fukuchi Peaty Beds are thought to be parts of such filing deposes of the lake. Source

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