Early assessment of Shorea leprosula progeny trial

摘要

Evaluation on progeny trial consisted 40 half-sib families of Shorea leprosula established in the Ulu Sedili Forest Reserve, Johor was conducted. The progenies were taken from plus tree originated from 5 sites namely Sungai Menyala Forest Reserve, Bukit Rengit Forest Reserve, Bangi Forest Reserve, Gombak Forest Reserve and Tranum Forest Reserve. Height increment and survival rates at 21 months were evaluated. Most of the families showed high survival rates with the highest recorded on Family 14 (96.9 percent) and the lowest were Family 7 (62.5 percent). There was a significant difference in height increment observed among the progenies with the highest for Family 5 (mean total increment=l.67m) and the lowest Family 26 (mean total increment=0.73m).High variation on both survival and height increment were observed within and between the families. The environmental effects such as light and and micro climatic conditions might contribute the high variation.