八郎潟干拓地における植物相と雑草の変遷

概要

論文の詳細を見る
The present studies dealt with the changes in the flora of Hachirogata reclaimed area, in which drainage operations were finished 12 years ago, and analysed those in the manpower required weeding paddy fileds in the area under consideration. 1) In 1978, 72 families and 330 species (incl. 4 varieties) were recorded in the central part of the area. Compared the current flora with the flora antidated the reclaimation, 13 families and 104 species increased. 2) During 12 years, Compositae, Gralnineae, Leguminosae and Cyperus became enriched in the components, but a lot of weeds, ruderal and alien plants have recognized among them. 3) Owing to the increasing trend in alien plants, an emphasis should be put on particularly the importance of watching for their expansion within the whole area. 4) Although handweeding of Scirpus biconcovus and Echinochloa crus-galli var. crus-galli was tinle-consumed work for the eraly settler, the laborious expenses of weeding have been considerably reduced by herbicides and the mecahnization, and become the same as those of ordinary paddy-field-workers outside the area within a few years after the settlement began.
日本雑草学会の論文
1982-08-26