杉木半同胞子代测定及优良家系选择

对融安县西山林场72个杉木半同胞家系子代1、2、3、4和25年生的树高、胸径和材积进行分析，结果表明，各家系间树高、胸径及材积差异大部分达显著或极显著水平；生长性状在各年龄间的秩次相关绝大部分为极显著正相关，大部分家系早晚期生长表现稳定，具有较高的一致性；而有小部分家系生长性状在幼龄与成熟龄之间变化较大，早晚期生长表现不稳定。以25年生时成熟林的生长量为主要依据，筛选出柳241、柳244、柳220、山口10、广运171等27个综合增益显著的家系，其树高、胸径和材积增益最高，分别达26．29％、62．68％和110．42％。

Half-Sib Progeny Test and Superior Cunninghamia lanceolata Family Selection

The indexes including tree height, DBH and standing volume of 72 halt-sib progeny families ot Cunninghamia lanceolata were measured for l yr, 2yr, 3yr, 4yr and 25yr old trees that were sampled from Xishan Forest Farm in Rong＇ an County. The results showed that there were significant or extremely significant differences in these index values among most of the families. Most of the growth traits were extremely significantly and positive- ly correlated with the ages. The growth traits of the most families were stable and highly consistent along the age in- crementl However, there was great change in these growth indexes between the juvenile and mature stages of some families, showing the instability along the age increment. According to the growth index values of 25yr old mature stage, 27 half-sib progeny families including Liu241, grated gain were screened out, whose highest gains 110.42% respectively. Liu244, Liu220, Shankoul0, Guangyun171 with highly inte- in tree height, DBH and volume was 26.29%, 62.68% and