Analysis of Vegetation and Vegetation-Environment Relationships in Main Wild Vegetables of Ulleungdo in Korea -Vegetation of herb layer of the Aster glehni, Allium ochotense, and Aruncus sylvester -

울릉도 주요 산채류 자생지의 식생 및 환경과의 상관관계 분석 -섬쑥부쟁이, 울릉산마늘, 눈개승마의 초본층 식생을 중심으로-

Abstract

This study was conducted to provide ecological basic data that use to establish environmental conditions for cultivation of wild vegetables in 2016-2018. Therefore, we investigated the vegetation structure and the correlation between the community structure and the environmental factors for natural habitats of wild vegetables(Aster glehni, Allium ochotense, and Aruncus sylvester) distributed in Ulleungdo. As a result of population and gradient analysis, the vegetation was classified into Aster glehni community, Allium ochotense community, and Aruncus sylvester community. We confirmed that the classification by population analysis was consistent with that by TWINSPAN method, suggesting that they were complemented each other. The importance value of Aster glehni was the highest in all communities, followed by Aruncus sylvester, Allium ochotense, Hydrangea petiolaris, Dryopteris crassirhizoma, Asperula ldorata, Phryma leptostachya var. asiatica, Disporum viridrescens, Hedera rhombea, Anthriscus sylvestris, and Hepatica maxima. According to the results of DCCA ordination analysis, among those communities, the Aster glehni community was distributed in soil where the nutrition including T-N and O.M. were intermediate. The Allium ochotense community was distributed on the a little high northern slope at the highest altitude where the CEC and O.M. were the highest, and other nutrition and pH were low. The Aruncus sylvester was distributed on high slope and altitude on which the amount of exchangeable cation such as $Ca^{{+}{+}}$, $Mg^{{+}{+}}$ and pH were high, and the CEC, $P_2O_5$, and O.M. were the lowest.

Figure 1. Climate diagram of Ulleungdo(Korea Meteorological Administration, 2008-2017).

Figure 2. Smple plots at the Ulleungdo.

Figure 3. The path way of subdivision into groupings of herb layer species on the main wild vegetables communities in Ulleungdo using TWINSPAN. ◯=Aster glehni community ▲=Allium ochotense community □=Aruncus sylvester community

Figure 4. Ulleungdo main wild vegetables communities vegetation data : DCCA(detreended canonical corre- spondence analysis) ordination diagram with plots(◯, ▲, □) and environmental variables(arrow) The plots are : ◯=Aster glehni community, ▲=Allium ochotense community, □=Aruncus sylvester community.

Table 1. Synthesized table of main wild vegetables population in Ulleungdo

Table 2. Synthesis table of herb layer species on the main wild vegetables communities in Ulleungdo using TWINSPAN

Table 3. Soil characteristics in 0∼20㎝ soil depth of study site in the Ulleungdo

Table 4. Importance value of herb layer species on the main wild vegetables communities in Ulleungdo

Table 5. Ulleungdo main wild vegetables vegetation data from Figure 4 : the inter set correlation coefficients and the inter set correlation of environmental variables with the first two axes of DCCA. For a description of variables, see Figure 4 legend