본 연구는 지리산국립공원구역 중 아고산대 생태계 특성을 가지고 있는 노고단을 대상으로 인위적 복원조치에 의한 식생복원효과와 산림훼손지역의 자연적 식생회복상태를 구명하고자 한다. 20년 전 산림훼손지역에 5m×5m 크기의 종자를 파종한 8개의 조사구와 원식생인 2개의 조사구를 설정하였다. 주요 출현종은 털진달래, 떡버들, 새, 산구절초 및 실새풀 등이 나타났다. 군집분류는 PC-ORD의 TWINSPAN을 사용하여 꿩의밥군집, 터리풀군집, 노랑제비꽃군집 3개의 유형으로 분류되었으며, 이를 바탕으로 종다양성지수를 분석한 결과 군집I에서 1.0491~1.1220으로 가장 높았으며, 군집II가 0.9418~1.1256으로 낮게 나타났다. 균재도는 0.8217~0.8865의 범위로 현재 종간 경쟁에 의해 안정되어 가는 과정으로 판단되며, 시간이 가면서 입지환경에 적응된 수종들에 의해 안정된 군락이 될 것으로 사료된다. 군집 간 유사도지수는 비교적 동질하게 나타났는데 이는 훼손된 노고단지역이 20년이 지난 현재 훼손지가 복원되고 있는 것으로 유추할 수 있다.This study was intended to investigate into the vegetation restoration effect in Nogodan, characterized by the ecological subalpine zone, within Chiri Mountain National Park Area, which results from artificial restoration measures, and to examine the restored state of natural vegetation in the degraded area. For the investigation, 8 groups measuring 5m × 5m were sown with the seeds and 2 groups were not sown with any seed in the region degraded two decades ago. The species that appeared included Rhododendron mucronulatum var. ciliatum Nakai, Salix hallaisanensis H.Lev, Arundinella hirta (Thunb.) Koidz, Dendranthema zawadskii (Herb.) Tzvelev, Calamagrostis arundinacea (L.) Roth, etc. The vegetation community was classified into three different categories, Luzula capitata (Miq.) Miq. community, Filipendula glaberrima Nakai community, and Viola orientalis (Maxim.) W.Becker community, using the TWINSPAN of PC-ORD. Based on such categorization, the species diversity index was analyzed. The results of analysis showed that the species diversity was highest in the community I with the index ranging from 1.0491 to 1.1220, and was low in the community II with the index ranging between 0.9418 and 1.1256. The evenness was in the range from 0.8217 to 0.8865 which suggests that the evenness was being stabilized due to interspecific competition, and it is considered that the colony will achieve stabilization stimulated by the tree species that have adapted themselves to the location environment with the elapse of time. The intercommunity similarity index was found to be relatively homogeneous, which implies that the degraded Nogodan region has been in the process of restoration over the last two decades.