Early performance of 23 dipterocarp species planted in logged-over rainforest

WIDIYATNO, SOEKOTJO, NAIEM M, PURNOMO S & SETIYANTO PE. 2014. Early performance of 23 dipterocarp species planted in logged-over rainforest. The objective of the present study was to evaluate the growth of selected species of dipterocarps as reforestation potential. The trial was conducted using 23 potential species of dipterocarps and random complete block design, with four blocks used as replication. Diameter at breast height (dbh), height and survival rate were measured at 6.5 years. There was significant difference in dbh. The best two species were Shorea platyclados and S. leprosula where dbh values were 16.6 and 14.3 cm respectively. The species with the lowest dbh was Dipterocarpus caudiferus, 5.7 cm. Height growth was also significantly different. The two tallest species were S. platyclados and S. leprosula (8.6 and 8.3 m respectively). The species with the lowest height was D. caudiferus (4.4 m). Seven species showed high survival rates (71 to 85%), nine species moderate (50 to 70%) and seven species low (38 to 48%)