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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
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【体育博彩平台排名】The clones with high quality and cold resistance were selected based on the 体育博彩平台排名 evaluation of E. urophylla clones test forest in Shaoguan.【体育博彩平台排名】103 E. urophylla clones were selected as research materials, the 体育博彩平台排名 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. 【体育博彩平台排名】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 体育博彩平台排名 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 体育博彩平台排名 factors, but also environmental factors. Except that C18 had no significant correlations with growth traits, the phenotypic and 体育博彩平台排名 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 体育博彩平台排名 gains were 13.18%, 13.01% and 136.27%, respectively. 【体育博彩平台排名】 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.
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