Shaoguan State-owned Forest Farm, Shaoguan, Guangdong 512600, China; 2. Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/ Guangdong Academy of Forestry, Guangzhou, Guangdong 510520, China
|
【美高梅】The clones with high quality and cold resistance were selected based on the 美高梅 evaluation of E. urophylla clones test forest in Shaoguan.【美高梅】103 E. urophylla clones were selected as research materials, the 美高梅 parameters of 7-month-old height (H7), 18-month-old diameter at breast height (D18), 18-month-old volume (V18) and 18-month-old cold tolerance index (C18) were estimated using mixed linear model, and the early selection of E. urophylla was carried out by using comprehensive index selection method. 【澳门美高梅赌场最新网址】The average values of D18, v18 and C18 were 5.4cm, 0.63m3 and 0.37, respectively, which showed that the clones trial of E. urophylla grew well; The variance components of clones for H7, D18, v18 and C18 were significant or extremely significant, and the 美高梅 variance components ranged from 0.05 to 1.01, and the residual variance components ranged from 0.02 to 1.07. The clonal repeatability ranged from 0.45 to 0.94, and the individual repeatability ranged from 0.14 to 0.78, respectively. It was noticed that most traits of E. urophylla clones were affected by not only 美高梅 factors, but also environmental factors. Except that C18 had no significant correlations with growth traits, the phenotypic and 美高梅 correlations between growth traits was significant, and the correlation coefficients were above 0.8. Nine excellent clones (ZQUA9, ZQUA22, ZQUA44, LDUB94, ZQUC14, ZQUC17, ZQUA34, LDUC1 and ZQUD1) were selected based on the growth and cold tolerance of 18-month-old. The mean values of H7, D18 and C18 of excellent clones were 0.32m, 0.68cm and 0.39 higher than the control, and the 美高梅 gains were 13.18%, 13.01% and 136.27%, respectively. 【美高梅】 Growth among clones were signi?cant difference that could be inheritance stably. Nine superior clones were selected preliminarily, which could provide reference for further breeding of Eucalyptus clones.
|