Abstract
Abstract
The purpose of this research was to determine species grouping of Shorea sp. based on the characteristics of periodic individual diameter increment on natural forest. The study was conducted on Labanan forest research station located in Berau, East Kalimantan. This study was using data series on logged over forest permanent plots with total of 8 ha along 1990-2018. Shorea spp. species group was determined based on the number of classes (5 classes) as responsive scale of periodic diameter increment rates. The consistency assessment analysis was conducted using compares of two approaches which as by interval class and euclidean distance method. The identified results of measuring 26 species of Shorea, 16 species can be further analyzed into species grouping based on their increment. The interval class rates approach has different scale with euclidean distance rates for cluster similarity method. Shorea parvifolia, S. johorensis, S. pinanga and S. scrobiculata were recommended as very responsive or fast-growing species. Whereas S. patoiensis, S. beccariana and S. smithiana were in the slow growing species group. This result is providing the recommendation of selection of priority species based on the increment rates characteristic for increasing the productivity especially on production forest stand.