沖縄県の主要作物畑における帰化雑草

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This study was carried out to investigate the incidence and characteristics of naturalized weed species based on vegetation analysis in fields of the main three crops cultivated in Okinawa Prefecture, i.e. sugarcane, pineapple, and vegetables. 1) In the fields of these main three crops there were 60 weed species belonging to 21 families. The largest number of naturalized weed species belonged to the Compositae and they occurred in all the fields, in particular in pineapple fields, followed by Gramineous weeds which were abundant in both sugarcane and pineapple fields, but few in vegetable fields. 2) The naturalized weeds in the sugarcane and pineapple fields, originated mainly from tropical America, while in the vegetable fields they originated mainly from Europe. 3) The ratio of naturalized weeds calculated from data based in the number of weeds appearing with the highest frequency as well as of dominant weeds was higher than that calculated from the total number of weed species observed. Therefore the naturalized species of weeds were chiefly responsible for the heavy damage caused to crops. 4) In the fields of the main three crops, the life form spectrum of Th, Th(w), R_5, D_1 , D_2, b among the naturalized weeds, was broader than that of the native ones. Since the ratio of naturalized weed was the highest in the vegetable fields, the life form spectrum of the weeds was affected by that of the naturalized weeds in these fields.
日本雑草学会の論文
1992-10-31

沖縄県の主要作物畑における帰化雑草

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