Hardwood forest tree plantations in Sumatra.
Three trial plantations of native timber trees and a few exotics are described, all planted at 1200-1400 m alt. in N. Sumatra between 1916 and 1973. At 2 of the sites, association of many species in small plots has resulted in a mixed forest of natural appearance with many emergents up to 65 m high, especially of Altingia excelsa, Casuarina junghuhniana and native conifers included in the trials (especially Podocarpus amarus). The largest exotics were Eucalyptus deglupta and Grevillea banksii with d.b.h. up to 120 cm at 60 yr old. Local dipterocarps (e.g. Shorea platyclados) also grew well. Notes are given on the principal timber trees of Sumatra.