Jun-ichi P. Abe
University of Tsukuba
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Featured researches published by Jun-ichi P. Abe.
Mycoscience | 1994
Jun-ichi P. Abe; Gaku Masuhara; Keizo Katsuya
Vesicular-arbuscular (VA) mycorrhizal fungi in pure patches of coastal dune plantsElymus mollis, Wedelia prostrata andZoysia macrostachya were examined for frequency of occurrence and number of spores of VA mycorrhizal fungi over one year. Six species in three genera of VA mycorrhizal fungi were recovered. Under a patch ofE. mollis, spores ofAcaulospora sp. 1,Glomus tortuosum, Glomus sp. 1,Glomus sp. 2 andScutellospora gregaria were recovered. Spores ofGlomus spp. were most common. In patches ofW. prostrata andZ. macrostachya spores ofAcaulospora sp. 1,G. tortuosum, Glomus sp. 1,Glomus sp. 2,S. gregaria andScutellospora sp. 1 were found.
Mycoscience | 1995
Jun-ichi P. Abe; Keizo Katsuya
Five study sites in Japan with pure patches ofElymus mollis near to the shoreline were chosen. Abundance of spore formation ofGlomus spp. underE. mollis patches were studied at four sites to understand the factors determining the development of VA mycorrhizal fungal communities at the edge of coastal sand dune vegetation. At each study site, eight soil samples from two soil depths were collected four times (three times for “Niigata”) during a year. Spores ofGlomus spp. predominated at every site, but species composition ofGlomus spp. differed from site to site. In a further experiment to measure the soil depth of the highest spore densities underE. mollis, the highest density was found at depths where rhizomes ofE. mollis were present.
Lichenologist | 2013
Yoshihito Ohmura; Kentaro Hosaka; Taiga Kasuya; Jun-ichi P. Abe; Makoto Kakishima
The activity concentration of 131I, 134Cs and 137Cs radionuclides in lichens was traced one and a half months after the Fukushima nuclear accident. The samples were collected in Tsukuba City, which is located c. 170 km south of the Fukushima Daiichi nuclear power plant (NPP). The activity concentrations differed depending on species and habitat. For example, the maximum activity concentration of 137Cs was 22596 Bq kg–1 dry weight in Physcia orientalis (collected from the trunk of Zelkova serrata on 30 June 2011), and 1928 Bq kg–1 in Hyperphyscia crocata (from the trunk of Quercus myrsinaefolia collected on 8 March 2012). The activity concentration of 137Cs in Dirinaria applanata and Phaeophyscia spinellosa growing on vertical habitats decreased by c. 50% within a year, indicating radionuclides might have been washed off by rain. The radionuclides were apparently derived from the Fukushima NPP accident because: 1) one specimen collected at the same place one year before the accident did not contain radionuclides, 2) high activity concentrations of radionuclides were detected after the accident, 3) 131I, which has a short half-life of 8 days, was detected one and a half months after the accident, and 4) the ratio of 134Cs/137Cs in lichens was 0·90–0·98 on 26 April 2011, which is consistent with the values reported for radiocesium from the Fukushima NPP accident.
Journal of Environmental Radioactivity | 2015
Yoshihito Ohmura; Kimiyo Matsukura; Jun-ichi P. Abe; Kentaro Hosaka; Masanori Tamaoki; Terumi Dohi; Makoto Kakishima; Mark R. D. Seaward
(137)Cs concentrations in ten species of foliose lichens collected within Tsukuba-city in August 2013 ranged from 1.7 to 35 kBq/kg. The relationships between (137)Cs in two dominant species, Dirinaria applanata and Physcia orientalis, and the air dose rate (μSv/h) at the sampling sites were investigated. (137)Cs in P. orientalis measured about 1 year after the Fukushima nuclear accident was correlated (r(2) = 0.80) more closely with the air dose rate than those measured after about 2 years (r(2) = 0.65), possibly demonstrating its continued value as a biomonitor to reflect ambient fall-out levels. In contrast, those of Dirinaria applanata were not correlated with the air dose rate in either year.
Archive | 1995
Jun-ichi P. Abe; Keizo Katsuya
Five study sites in Japan with pure patches ofElymus mollis near to the shoreline were chosen. Abundance of spore formation ofGlomus spp. underE. mollis patches were studied at four sites to understand the factors determining the development of VA mycorrhizal fungal communities at the edge of coastal sand dune vegetation. At each study site, eight soil samples from two soil depths were collected four times (three times for “Niigata”) during a year. Spores ofGlomus spp. predominated at every site, but species composition ofGlomus spp. differed from site to site. In a further experiment to measure the soil depth of the highest spore densities underE. mollis, the highest density was found at depths where rhizomes ofE. mollis were present.
Mycoscience | 2003
Fumiaki Usuki; Jun-ichi P. Abe; Makoto Kakishima
Mycoscience | 2004
Yuichi Yamaoka; Hayato Masuya; Nobuaki Ohtaka; Shigeru Kaneko; Jun-ichi P. Abe
Plant Pathology | 2006
W. H. Chung; Jun-ichi P. Abe; Yuichi Yamaoka; J. W. Haung; Makoto Kakishima
茨城大学教育学部紀要. 自然科学 | 2015
Yoshitaka Ono; Jintana Unartngam; Chanjira Ayawong; Jun-ichi P. Abe; Izumi Okane; 義隆 小野
Mycoscience | 2018
Shohei Fujimori; Jun-ichi P. Abe; Izumi Okane; Yuichi Yamaoka