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该峨眉冷杉初级无性系种子园面积4.98 hm2,共保留63个无性系,无性系内分株的变幅为3株~101株;种子园内63个无性系20 a生平均树高、平均胸径和平均冠幅的变幅分别为8.04 m~12.27 m、15.32 cm~26.45cm和4.05 m~7.02 m,生长性状的方差分析表明,无性系间平均树高、胸径和冠幅差异达到极显著水平,无性系内树高、胸径和冠幅差异不显著;种子园内无性系分株在30株以上无性系共19个,19个无性系的树高、胸径和冠幅的均值分别为10.26 m±2.54(变幅5.69 m~14.35 m)、18.62 cm±5.21(变幅11.20 cm~32.57 cm)和4.95 m±0.82(变幅2.76 m~6.39 m)。19个无性系的主要生长性状方差分析结果进一步表明,无性系间平均树高、胸径和冠幅差异达到极显著水平,无性系内树高、胸径和冠幅差异不显著,对19个无性系的主要生长性状进行多重比较和排序,为下一步研究无性系营养和生殖生长相关性奠定基础;无性系的胸径和树高两主要生长性状呈显著正相关;无性系内的生长性状平均数的变异较无性系间小得多,说明生长性状主要受遗传控制。该种子园至今未结实,对不结实的原因和下一步经营措施进行探讨。 相似文献
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木麻黄无性系造林对比试验 总被引：2，自引：0，他引：2
文章运用方差分析、遗传参数估算、相关分析等方法对3.5年生42个木麻黄无性系试验林进行了优良无性系的筛选。结果表明：7个性状在无性系间均有极显著差异;树高、胸径、地径的重复力较高,分别为0.809、0.758、0.737,选择具有较好的效果;遗传相关分析显示,地径、树高、冠幅、通直度这4个性状之间存在遗传高度相关性;树高与冠幅早晚期相关分析显示,遗传相关和表型相关的强度趋势一致,而且遗传相关系数值要大于表型相关系数值。最后,筛选出8个生长迅速、适应性强的优良无性系及4个抗逆性强、冠幅开展,但树高、胸径生长相对缓慢的无性系。高径生长缓慢的无性系可用于与生长迅速的无性系材料进行混交,形成高低错落有致的复层混交结构,提高林分的防护功能。 相似文献
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该粗枝云杉初级无性系种子园面积4.6 hm2,4个大区共保留87个无性系。1区无性系胸径、树高和冠幅的均值分别为8.52 cm、4.36 m和3.11 m;2区无性系胸径、树高和冠幅的均值分别为8.90 cm、5.50 m和3.60 m;3区无性系胸径、树高和冠幅的均值分别为8.89 cm、5.21 m和3.54 m;4区无性系胸径、树高和冠幅的均值分别为10.13 cm、6.50 m和4.17 m。方差分析表明,1区无性系胸径、树高和冠幅无性系间(内)差异极显著;2区无性系胸径、树高和冠幅无性系间(内)差异不显著;3区无性系胸径无性系间(内)差异极显著,树高无性系间(内)差异极显著和差异显著,冠幅无性系间差异极显著,无性系内差异不显著;4区无性系胸径、树高和冠幅无性系间(内)差异极显著。无性系内的生长量平均数变异较无性系间的小得多,初步说明生长性状主要受遗传控制。立地条件对无性系树高影响差异极显著,对胸径影响差异显著,对冠幅影响差异不显著,立地×无性系交互作用对无性系胸径、树高的影响差异极显著。依据各区无性系的树高的多重比较对各区无性系的生长性状进行排序。对种子园的经营管理和利用途径进行了探讨。 相似文献
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对福建省洋口国有林场1994年营建的杉木无性系测定林的生长性状进行调查分析,结果表明:无性系16年生时平均树高、胸径、单株材积分别为13.19 m、14.59 cm、0.1339 m3;无性系树高、胸径、材积重复力达0.6873以上,生长性状受到中等强度的遗传控制。以16年生时材积为指标选出4个速生无性系,平均树高、胸径、单株立木材积分别为14.30 m、16.30 cm、0.17696 m3,遗传增益均值分别为13.03%、12.26%、33.26%。 相似文献
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杉木无性系生长和木材密度的遗传变异及选择 总被引：3，自引：0，他引：3
研究了８年生杉木无性系试验林的树高、胸径、材积和木材密度的遗传变异规律。结果表明：试验中各性状在无性系间存在显著差异,遗传变异系数树高为９．０％,胸径为１３．７％,材积为３０．０％,而木材密度只有６．７％,各性状均有较高的重复力,木材密度和胸径的重复力在９０．０％以上。树高、胸径、材积３个生长性状间有较高的遗传正相关,而胸径、材 与木材密度间表现出中度的遗传负相关,树高与木材密度间则表现出弱度的遗 相似文献
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研究了８年生杉木无性系试验林的树高、胸径、材积和木材密度的遗传变异规律。结果表明：试验中各性状在无性系间存在显著差异，遗传变异系数树高为９０％，胸径为１３７％，材积为３００％，而木材密度只有６７％，各性状均有较高的重复力，木材密度和胸径的重复力在９００％以上。树高、胸径、材积３个生长性状间有较高的遗传正相关，而胸径、材积与木材密度间表现出中度的遗传负相关，树高与木材密度间则表现出弱度的遗传负相关。采用简化的指数选择法评选出４个优良的无性系，材积现实增益２５５２％，遗传增益２１０５％，用木材密度与ＣＫ相近。 相似文献
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杨树无性系生长和材性的遗传变异及多性状选择 总被引：17，自引：3，他引：17
以７年生２５个杨树无性系为材料研究了生长和材质性状的遗传变异及性状之间的相关．６个性状纤维长、纤维宽、长宽比、木材密度、树高、胸径在无性系间均存在极显著的差异。生长和材质性状受中等更强度的遗传控制．６个性状的重复力分别为８１．９％，７３．３％，７０．５２％。６４．３％．６８．８％，７０．５４％．胸径和树高之间、纤维长度与纤维长宽比、胸径之间、木材密度与胸径之间都呈现出较高的遗传正相关．宜接选择效果优于间接选择，指数选择优于直接选择。由４性状树高、胸径、纤维长度与基本密度配合的选择指数对本实验群体比较合适。利用选择指数评选出４个生长和材质兼优的优良无性系。 相似文献
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经对5年生杉木无性系试验林中36个无性系的树高、胸径、材积3个性状进行分析,结果表明:各性状无性系间差异极显著,且有较高的重复力和中等变异系数;生长性状间有较密切的遗传相关关系,以生长性状为基础,初选出6个较速生的无性系,其平均材积对照比较,现实增益为92.08％,遗传增益为71.34％。 相似文献
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Deyang Liang Changjun Ding Guanghao Zhao Weiwei Leng Min Zhang Xiyang Zhao Guanzheng Qu 《林业研究》2018,(3)
Understanding genetic variation is important for efficiently selecting excellent clones and utilizing genetic resources during tree breeding. We investigated 16 growth traits of 50 32-year-old Pinus koraiensis clones. Analyses of variance showed that all the test traits differed significantly among clones. Average height, diameter at breast height(DBH), and volume of all clones were 10.41 m, 21.30 cm,and 0.148 m3, respectively. Phenotypic coefficients of variation and repeatabilities of traits ranged from 4.37 to48.03% and from 0.013 to 0.900, respectively. There exists significant positive correlations among heights, diameter at different heights(1.3, 3.0, 5.0 m), and volumes; genetic correlation was close to phenotype correlation. Using four growth traits(height, DBH, volume, average crown width)as indices for a comprehensive evaluation, five clones(PK11, PK 19, PK 04, PK 14, and PK 28), whose traits scored in the top 10%, were selected as elite clones. For these clones,genetic gains in height, DBH, volume and crown height were 8.58, 13.02, 32.72 and 3.83%, respectively. These results provide important information for improving P.koraiensis breeding programs. 相似文献
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以河南省国有温县苗圃试验地6个种源的180个家系的实生苦楝为研究对象进行生长性状差异性分析。结果表明,180个家系间胸径、树高和冠幅差异极显著;6个种源间胸径和树高差异极显著。对试验地现存的苦楝个体生长性状进行相关分析,结果表明,树高与胸径、枝下高、冠幅,胸径和冠幅表现出极显著相关。对苦楝180个家系进行选优,共选出32个优良家系,其中渭南种源12个,郑州种源15个,兰考种源2个,新乡种源3个。对1211株苦楝个体进行无性系选优,共选出90株优良无性系苦楝,选中的家系和个体可用于下一步的选优选育。 相似文献
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Deyang Liang Changjun Ding Guanghao Zhao Weiwei Leng Min Zhang Xiyang Zhao Guanzheng Qu 《林业研究》2018,29(3):611-622
Understanding genetic variation is important for efficiently selecting excellent clones and utilizing genetic resources during tree breeding. We investigated 16 growth traits of 50 32-year-old Pinus koraiensis clones. Analyses of variance showed that all the test traits differed significantly among clones. Average height, diameter at breast height (DBH), and volume of all clones were 10.41 m, 21.30 cm, and 0.148 m3, respectively. Phenotypic coefficients of variation and repeatabilities of traits ranged from 4.37 to 48.03% and from 0.013 to 0.900, respectively. There exists significant positive correlations among heights, diameter at different heights (1.3, 3.0, 5.0 m), and volumes; genetic correlation was close to phenotype correlation. Using four growth traits (height, DBH, volume, average crown width) as indices for a comprehensive evaluation, five clones (PK 11, PK 19, PK 04, PK 14, and PK 28), whose traits scored in the top 10%, were selected as elite clones. For these clones, genetic gains in height, DBH, volume and crown height were 8.58, 13.02, 32.72 and 3.83%, respectively. These results provide important information for improving P. koraiensis breeding programs. 相似文献
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以28个水曲柳无性系为材料,测定其树高、胸径生长性状,进行变异分析,筛选出优良无性系.结果表明:各无性系的树高、胸径极显著相关(P<0.01),无性系间树高、胸径差异均达极显著差异水(P<0.01).以20％的入选率,初选出无性系1333、1311、1322、1312、1321和1323为优良无性系,6个无性系平均树高... 相似文献
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《Scandinavian Journal of Forest Research》2012,27(7):621-630
To better understand the genetic control of fiber properties (fiber length [FL], fiber width [FW] and coarseness [C]) and growth traits (tree height [H], diameter at breast height [DBH] and stem volume [SV]) in triploid hybrid clones of Populus tomentosa carr., genetic relationships among selected fiber properties with growth traits were examined in five-year-old clonal field trials located in Yanzhou, Gaotang and Xiangfen, China. In total, 180 trees from 10 clones were sampled from the three sites. The site had a moderate effect on FW, C and tree growth, and a highly significant (P<0.001) effect on FL and fiber length/width (FL/W). Clonal effects were also significant (P<0.05) for all studied traits except for the DBH and SV. Clone×site interactions were significant for all studied traits (except for FL). The estimated repeatability of clonal mean for FL (0.91) was higher than for FW (0.88), C (0.77), FL/W (0.74), H (0.62), DBH (0.61) and SV (0.55). Intersite genetic correlation estimates indicated that fiber properties were more stable than growth traits. Positively insignificant genetic correlation estimates between FL and growth trait and negatively insignificant genetic correlation estimates between C and growth traits were observed. This suggests that in the triploid hybrid poplar, clones selection for growth traits will not result in a significant increase or reduction in the fiber properties. 相似文献
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该文报道了大叶榉树无性系2年生幼林生长测定结果。研究表明,不同无性系树高、胸径、枝下高、冠幅、干形、分枝数、分枝粗、分枝角度等8个性状均有显著差异(P0.05),不同性状的遗传变异系数在4.7%~26.6%之间,性状重复力在0.49~0.89之间。胸径与树高、枝下高之间,冠幅与分枝角度、干形(弯曲度)之间存在显著正相关,树高与分枝粗度之间存在显著的负相关。主成分分析结果显示,无性系性状前4个主成分的贡献率达85.21%,利用主成分得分值进行聚类分析,可将24个无性系划分为4类。以用材为育种目标,初选出"红4"、"桔3"和"黄10"等3个优良无性系。 相似文献
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榆林市榆阳区杨树地径、胸径、树高、材积相关性研究 总被引：2，自引：0，他引：2
通过对60株榆林市榆阳区内生长的合作杨(Populus simonii×P.pyramidalis cv.‘Opera8177)’生长情况的调查,结果表明:随着树木生长加粗,胸径、地径基本同步增粗,胸径/地径比值变化很小,数值是0.84倍左右,其范围在0.82～0.86;树高的生长量随树木的生长加粗呈现放缓的规律,随着树木生长加粗,树高/地径比值逐渐变小,地径8 cm时,树高/地径比值是58.92倍,地径48 cm时,树高/地径比值是33.38倍。 相似文献
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采用常规杂交方法,开展楸树与滇楸种间杂交育种,对结实率、果实性状、千粒质量、有胚率、发芽性状及1年生株高、胸径等数据进行统计分析。结果表明:父本对结实率的影响不显著,母本对结实率影响显著;父本对果实性状的影响均不显著,母本对果实长度的影响显著;父母本对千粒质量的影响均不显著;父母本对有胚率、发芽势、发芽率的影响显著或极显著。不同杂交组合间株高和胸径存在极显著差异,杂交组合8-12×滇3表现最好,其株高为2.09 m,胸径达到1.38 cm,杂交组合8-13×滇2和5-8×滇2表现也较好,依据株高、胸径进行苗期早期选择的潜力较大;表现最差的组合是8-14×滇2,株高1.69 m,胸径1.00 cm。 相似文献
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本文对9个尾叶桉、巨尾桉、尾巨桉无性系0.5~2.5年生试验林生长率、差异性及林分直径结构分析,发现林龄0.5~1.5 a是无性系树高生长高峰期,此时树高生长率达79.20%~96.27%,是林龄1.5~2.5 a树高生长率的3~4倍;林龄1.5~2.5 a时,各无性系林分胸径、树高、单株材积生长率分别为19.66%~25.67%、18.58%~27.96%、52.57%~62.54%,生长率最大的是E7号无性系(胸径、单株材积)和E6号无性系(树高);秩次相关分析表明：各无性系胸径、单株材积生长量在不同林龄时排序变动不大,而无性系树高生长量排序在不同林龄时变动较大;差异性分析表明：无性系间胸径、树高、单株材积生长差异显著,但随林龄增加有差异减小趋势;林龄2.5年生时,E5号无性系胸径、单株材积生长量最大,分别达11.39 cm、0.0736 m3;各无性系林分树木径阶范围为6~14 cm或8~14 cm,以10 cm或12 cm径阶树木占最大比例,除E8号无性系外,其余8个无性系树木径阶分布总体上近似正态分布。 相似文献
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Ammar Khalil Mohamed Ahmed Luping Jiang Fang Wang Song Chen Xueyan Zhou Xiaona Pei Xiyang Zhao Guanzheng Qu 《林业研究》2020,31(1):45-55
To determine appropriate quantities of water and fertilizer required for early growth of hybrid poplar cuttings,we recorded the growth traits of four clones grown under four factors(irrigation and nitrogen,phosphorus,and potassium fertilizers),each with four levels,using an orthogonal experimental design.A logistic model was used to estimate growth in height.The growth curves for tree height were sigmoid,and the model R^2 values were greater than 0.9,which indicated that the fit was highly significant.ANOVA results for tree height and basal diameter indicated that all sources of variance showed significant differences(p<0.001).The average tree height and basal diameter for all the four clones under the different treatments ranged from 155.39 to 235.04 cm,and from 13.71 to 17.42 mm,respectively.A highly positive correlation between the extreme k value and tree height was observed,suggesting that the k value was an accurate estimation of tree height.For model parameters,the earliest average time point for the onset of the rapid growth period of poplar clones was 131 d,and the highest average increment in tree height during the rapid growth period was 138.78 cm.The highest average tree height for all clones under each factor was 219,210.51,200,and 201 cm when treated with either 1200 mL of water applied every third day,3 g of nitrogen,0 g of phosphorus,or 0 g of potassium,respectively.The most suitable treatment for the early growth of hybrid poplar cuttings,as suggested by the developed logistic model,was 1200 mL of water applied every third day and three applications of 1 g nitrogen(in the form of CH4N2O). 相似文献