To investigate salt-tolerant and seawind-hardness ornamental trees for landscaping of seaside areas, field observation of the vegetation growing natively along the seacoast of southern parts of Jeju island (from Sagaeri Andukmyeun Namjejugun to Taeheungri Namwonmyeun Namjejugun) was carried out from the plant ecological point of view from February to April, 1977.
10m×10m quardrats were laid out on relatively undisturbed areas in order to determine frequency and density of the tree species, and data based on 27 quardrats.
Regarding the frequency and relative frequency rate, the rank of major dominants in the seacoast forest was Pinus Thunbergii, Eurya emarginata, Pittosporum Tobira, Eleagnus submacrophylla, Euonymus japonica, Rosa wichuraiana, Litsea japonica and Rhaphiolepis umbellata, and that of high density species was Pinus Thunbergii, Eurya emarginata, Vitex rotundifolia, Pittosporum Tobira, Eleagnus submacrophylla, Euonymus japonica, Rhaphiolepis umbellata, Litsea japonica and Liguatrum Ibota.
On the other hand, Pinus Thunbergii, Pittosporum Tobira, Eleagnus submacrophylla, Eurya emarginata, Euonymus japonica, Vitex rotundifalia and Rhaphiolepis umbellata were indicated as the typical tree species of outpost of the sea.
As a rule, the trees and shurbs growing nearest the sea, and keeping higher frequency rate of tree stand and more close density of population per unit area than others were regarded as the most salt-tolerant and seawind-hardness species.
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