Weed Flora of Ulreung Island in Korea

울릉도(鬱陵島)에 발생(發生)하는 잡초종(雜草種)

About 140 weed species belonging to 42 families occurring in summer were observed in Ulreung island. The Compositae was the most wildely occurring family covering 27 weed species, followed by 21 species in Graminae, 9 in Polygonaceae, 7 in Leguminosae, and 7 in Labiatae etc. In terms of the lands classified, about 60 species in 26 families were observed in the cultivated and the medical crops grown areas, respectively, and 116 species in 40 families occurred in the non-cultivated land like the vicinity of the cultivated area and 94 species in 34 families in the valley. No. of species and families were much greater in the non-cutivated land than those of the cultivated one. The most dominant weed species in both the cultivated and its vicinity in Ulreung island were Digitaria sanguinalis, followed by Portulaca oleracea, Polygonum hydropiper, Equisetum arvensis, Artemisia princeps, Commetina communis, Setaria viridis in order. Community analysis was done by the method of Toyohara in two cultivated lands such as the general crop land and the medical herb crop grown land, and two non-cultivated areas such as the vicinity of the cultivated land and valley. The cultivated land consisted of the communites of P. hydropiper and Cyperus amuricus, including Bidens tripartita in P. hydropiper community. The medical crop grown land composed of three major communities like P. hydropiper, Amaranthus mangostanus and Sonchus asper in which A. mangostanus and S. media were presented in the ecoton, indicating community being transiting. In the non-cultivated areas like the vicinity of crop land, the communities of Erigeron annuus, P. oleracea, and Oxalis corniculata were dominant, and Dystaenia takeshimana was included in the community of E. annuus and Stellan'a aquatica in P. oleracea community. In the valley, Ranunculus quelpaertensis community was existed in between the communities of Sonchus asper and Plantago asiatica.

울릉도(鬱陵島)의 농경지(農耕地)와 농촌지주변(農村地周邊)에 발생(發生)하는 하계잡초(夏季雜草)를 조사(調査)하여 얻어진 결과(結果)를 요약(要約)해보면 다음과 같다. 1. 잡초(雜草) 42과(科) 140종(種)이 조사(調査)되었다. 2. 농경지(農耕地) 및 비농경지(非農耕地)에 우점(優占)하는 잡초종(雜草種)은 바랭이, 쇠비름, 여뀌, 씌뜨기, 쑥, 닭의장풀, 강아지풀 순(順)이며 특(特)히 농경지(農耕地)에 쇠뜨기가 많이 발생(發生)하였다. 3. 농경지(農耕地)에서는 26과(科) 60종(種)의 잡초(雜草)가 조사(調査)되었고 여뀌와 방동사니군락(群落)로 형성(形成)되어 있었다. 4. 악초재배지(樂草載培地)는 26과(科) 60종(種)의 잡초(雜草)가 조사(調査)되었고 여뀌, 비름, 큰방가지똥군락(群落)으로 구성(構成)되었고 여뀌와 비름군락(群落)사이에 비름과 별꽃이 추이대(推移帶)로서 군락변천과정(群落變遷過程)에 있었다. 5. 농경지주변(農耕地周邊)에서는 40과(科) 116종(種)의 잡초(雜草)가 조사(調査)되었고 개망초, 쇠비름 및 괭이밥군락(群落)이 형성(形成)되어 있었다. 6. 계곡(溪谷)에서는 34과(科) 94종(種)의 잡초(雜草)가 조사(調査)되었고 큰 방가지똥과 질경이군락(群落)으로 구성(構成)되어 있었다.