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Volume 50 (2005)
- Issue 4 Pages 271-
- Issue 3 Pages 169-
- Issue 2 Pages 73-
- Issue 1 Pages 1-
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Volume 50, Issue 1
Displaying 1-7 of 7 articles from this issue
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Yuko Suto, Masaru Ogasawara, Takayoshi Nishio, Nobumasa Ichizen2005 Volume 50 Issue 1 Pages 1-9
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThe present study was conducted to clarify the influence of land use around roads and human activities such as weed control and tread pressure to the establishment of weed vegetation of road pavement seams. The weed vegetation of the seams was investigated at each 50 points of residential and paddy field areas from July 9 to August 13 in 2003 in Utsunomiya city, Tochigi Pref. The weed vegetation in residential areas consisted of 185 weed species belonging 54 families, and included 18 woody weeds and 6 horticultural medicinal plants. On the other hand, 119 weed species belonging 31 families with few woody weeds were observed at paddy field areas. Furthermore we found that the weed vegetation in residential areas differed from that in paddy field areas; 1) in residential areas, small weeds with trampling tolerance like Plantago asiatica and Sagina japonica were frequently observed, and 2) large-sized weeds such as Chenopodium album and Artemisia princeps were more frequently observed in paddy field areas than in residential areas. The ratio (%) of naturalized weeds in residential areas and paddy field areas were 36.2% and 35.3%, respectively.
In conclusion, it was demonstrated that the weed vegetation of road pavement seams at residential areas, had higher diversity than that at paddy field areas, and both weed vegetation differed evidently in respect of floristic composition. The results suggest that biological and artificial factors such as weed seed sources, seed dispersal, weed management and tread pressure affect the establishment of the weed vegetation of road pavement seams.View full abstractDownload PDF (2360K) -
Hiroshi Tsuyuzaki2005 Volume 50 Issue 1 Pages 10-17
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSCultivation experiments were conducted on Digitagia ciliaris (Retz.) Koeler populations collected from adjacent habitats including an upland field and a levee of a field in Okayama and Kyoto prefectures, and also a flowerbed and along a roadside near the flowerbed in Akita prefecture, with the aim of assessing intraspecific variation in morphological and ecological traits. The following results were obtained: Adjacent populations in each prefecture showed differences in earliness of heading, seed (spikelet) size and dormancy. Individuals from upland fields and the flowerbed population had earlier heading, smaller seeds and stronger seed dormancy compared to populations from levees of upland fields and the roadside near the flowerbed (Fig. 1 and Table 2).
Differences were also observed in seed production characteristics. D. ciliaris collected from upland fields and the flowerbed tended to allocate more dry matter to seeds and produce more and smaller seeds than that growing in levees and along the roadside (Figs 2, 3).
Judging from the environment of each sampling site, population differentiation is thought to be a result of the selective pressures of plowing, weeding and competition with other plants (Table 3).
D. ciliaris populations are thought to adapt their morphological and ecological characteristics to their habitats. These adaptations may enable the species to grow in various habitats such as upland fields, levees of fields, flowerbeds, and along roadsides throughout Japan.View full abstractDownload PDF (944K) -
Takeharu Itou2005 Volume 50 Issue 1 Pages 18-20
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (391K) -
Genetic erosion of wild rice caused by introgression from cultivated riceMasahiro Akimoto2005 Volume 50 Issue 1 Pages 21-29
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
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Tomoko Shibuya, Hirohiko Morita2005 Volume 50 Issue 1 Pages 30-41
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
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Masahiro Ichikawa2005 Volume 50 Issue 1 Pages 43-44
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (3244K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...2005 Volume 50 Issue 1 Pages 60-66
Published: March 18, 2005
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (628K)
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