거문오름 일대 삼나무림 간벌이 하층식물 분포변화에 미치는 영향

Abstract

This study investigated the change in understory plant distribution to find out the
 effect of cedar(Cryptomeria japonica) thinning on the diversity of plant species in the
 Geomunoreum of J e ju Island, the purpose of which was to restore natural vegetation.
 The vascular plants identified in the thinned plantations for 5 years from 2018 were a
 total of 95 taxa including 51 families, 79 genera, 86 species, 1 subspecies and 8
 variants. This showed a higher number of species compared to 52 taxa in the unthinned
 plantations and 67 taxa in the natural forest stand. The floristic target plants were
 identified: 25 taxa in the thinned plantations, 14 taxa in the unthinned plantations, and
 25 taxa in the natural forest. For 4 years after 2018, an increase of 40 species in the
 thinned plantations showed the highest rate of increase, followed by natural forests with
 33 species and unthinned plantations with 23 species. The species richness increased in
 both thinned and unthinned plantations, 3.16 and 1.10 respectively which is lower than
 4.11 in natural forests. The species diversity with an elapsed time of 6 years after
 thinning rose 3.64 in the thinned plantations, 3.42 in the natural forest and 3.21 in the
 unthinned plantations. The growth of diameter of the breast height was higher than that
 in the unthinned plantations. It is considered that the diversity of plant species in the
 thinned plantations around Geomunoreum is changing similarly to the surrounding natural
 forest as the number and population of newly emerging plant species increase.