... mitigation, and the first of all are thoseassociating with the conversion of native forest to agriculturalsystems, especially in the tropical zone. However, the effects of conversion of natural forest ... weed-controlling and fertiliz-ing during the first 3 years, and thinning twice between 10 ~ 15 yearold. The normal rotation length is 30 years for the CF and the FH and 40 years for the CK and the ... cochinchinensis and Symplocos stel-laris) in the NF, 12 of C. kawakamii in the CK, 11 of O. xylocarpa in the OX, 12 of F. hodginsii in the FH, and 12 of Chinese fir in the CFwere felled. The selected...