| dc.description.abstract | In a forest ecosystem, plants live and are closely related to each other and their environment. This relationship is seen from the variation in the number of each type of plant and the formation of the structure of the plants. Associations between species arise when two or more species are more often present together in a habitat, not by chance. Associations occur as a consequence of biotic interactions such as mutualism, competition and predation. This study aims to determine the study of understory plant associations in Eucalyptus stands (Eucalyptus sp.) in the Research and Development of PT Toba Pulp Lestari, Aek Nauli Sector. Using a vegetation analysis method with a plot measuring 2x2 m and determining points using purposive sampling. Based on the results of the study, the dominant understory plant species in eucalyptus stands aged 4 and 5 years are Clidemia hirta, Spermacoce remota L, Stachytarpheta jamaicensis, Christella dentata, Centella asiatica, Resam, Cyperus retundus, Pyllanthus urinaria, Crassocephalum crepidioides and Borreria alata. The real association pairs of understory plant species in 4 year old eucalyptus stands are C. asiatica with D. linearis, S. jamaicensis with D. linearis and C. dentata with D. linearis have a very weak relationship and the association is negative. In 5 year old eucalyptus stands, the real association pairs are P. urinaria with C. crepidioides, P. urinaria with C. rotundus, P. urinaria with B. alata have a very weak relationship strength and negative association. The types of C. crepidioides with C. rotundus, C. crepidioides with B. alata, C. rotundus with B. alata have a strong relationship strength and positive association. | en_US |
