Weed vegetation of road pavement seams in residential and paddy field areas in Utsunomiya city [Japan]
2005
Suto, Y. (Utsunomiya Univ. (Japan)) | Ogasawara, M. | Nishio, T. | Ichizen, N.
The 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.
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