Tree Diversity In Bufferzone Area at Sikulaping Protected Forest, Pakpak Bharat District, Indonesia

This research was conducted at protected forest Sikulaping, Pakpak Bharat Regency, North Sumatra. Data collection and processing were carried out in October - November 2019 using a purposive sampling method, by creating 3 sample plots at each location which is a buffer zone for the Sikukaping protected forest, the village namely Aornakan1, Kuta Tinggi and Sibongkaras. Observations were made on the sample plot with a size of 1000 meters by observing the 20 meters right and left of the plots. The results of this study showed that the number of trees varied for 3 buffer villages, Aornakan 1 Village, found a total of 41 individuals from 16 species with Palaqium gutta as the highest species found with 10 individuals and Species Important Value (41,450). As for Kutatinggi village, there are 22 individuals from 15 species and Shorea parvifolia were found 2 individuals with NPJ 19,008 along with 6 other species Durio zibethinus, Adinandra dumosa, Lithocarpus gracilis, Syzygium polyanthum, Tristianopsi whietena and Uncaria glabra. Whereas in Sibongkaras village, 30 individuals were found from 24 species with Styrax benzoid as the most common species with 4 individuals and NPJ 26,650. Tree diversity (H ') found in the villages of Aornakan, Kuta Tinggi are moderate criteria, by index 2.35, 2.64, while Sibongkaras with an index of 3.07 includes high diversity. The results of this diversity show that the Sikulaping protected forest has a good level of tree productivity and the condition of the forest is still maintained