鬱陵島 稀貴植物의 分布 및 生態에 關한 硏究 = Studies on Distribution and Ecology of Rare Plants Native in Ulreung Island

다국어 초록 (Multilingual Abstract)

Ulreung island harbors more diverse and rare native plants than any other area of Korea due to its geographic and climatic peculiarity. Many of the native plants have been used as famine crops, medicinal herbs, vegetables, and ornamentals. Some of them are important sources of income for residents on the island nowadays. This survey was conducted to select the promising native plants for use as vegetable or ornamentals, and to help residents economy by studying the methods for preservation and propagation of the valuable native plants.
1. Current native vegetation on Ulreung island consists of pure coniferous forests, 550 ha(10%), pure broad-leaved forests, 3,518ha(64%), and mixed forests, 636ha(12%).
2. Among the wild native plants, Lilium hansonil, Allium victorials var. platypliyllum, Arumcus diolicus var. kamtschaticus, Solidago virgaurea var. gigantea, Pteridium aqu-ilinum var. latiusculium, Osmunda japonica, Reynoutria sachalinensis, Aralia continentalis are used as vegetable and their edible parts are either young stems, sprouts or bulbs. While Gynostemma pentaphyllum is exported as a material for tea.
3. Those plants that were considered worthwhile to improve and propagate as ornamentals were Calanthe striata, Cymbidium goeringii, Hepatica maxima, Adiantum pedatum, Sorbus commixta, Thymus quinguecostatus etc. Those that appeared promising for garden tree or terrarium were Taxus cuspidata var. latifolia Nak, Tsuga sieboldii, Pinus parviflora, Tilia insularis, and Sorbus commixta etc.
4. As an ecological characteristic, Allium victorialis var. platypliyllum was distributed as a community on the slopes of mountains or uneven areas. They were thriving especially on humus rich area under tall or medium trees.
5. Natural habitats of Aruncus diolicus var. kamtschaticus and Solidago virgaurea var. gigantea etc. were found under the trees with dominance and sociability range of 5.5 to +. Therefore, more or less shading would be necessary for production of high quality crops.
6. Pteridium aquilimum var. latiusculium was distributed around the fields or paddy fields at the foot of mountains and on vestiges of slash-and-burn fields. Osmunda japonica was thriving on slightly humid low slopes and under the trees with high dominance.
7. Calanthe strialata, Cymbidium goeringii, Hepatica maxima, Adiantum pedatum, and Asplenium scolopendrium have either beautiful flower or leaves. They were distributed in dense forests of tall trees. Adiantum pedatum was found between rocks, Asplenium scolopendrium and Reynoutria sachalinensis, along the valley line, Ardisia japonica under Tsaga sieboldii, Pinus parviflora and Fagus crenata var. multinervis communities on Taewharyung and Thymus quinguecostacus, on a sunny area of Nan-Dong in large communities.
8. Propagation of the native plants would be possible as follows: Aruncus diolicus var. kamtschaticus, Allium victorialis var. platypliyllum, Thymus quinguecostatus and Soli-dago virgaurea var. gigantea by either division or seed, Hepatica maxima, Pinus parviflora, Tsuga sieboldii and Sorbus commixta by seed, those ferns such as Osmunda japonica, Adiantum pedatum and Pteridium aquilinum var. latiusculium by germinating spores aseptically in laboratory or in the greenhouse, Lilium hansonii by bulbscale cutting or by bulbscale tissue culture, Ardisia japonica and Taxus cuspidata var. latifolia by either seed or cutting and Thymus quinquecostatus by cutting.
9. Humus content of native soil was ranging from 19.1% to 91.2% and pH, from 4.7 to 5.3.