共查询到20条相似文献，搜索用时 500 毫秒
1.
In our study, two experimental plantations, respectively, with 24 and 32 new clones of P. tomentosa, were established in Weixian County, Hebei Province and Wuzhi County, Henan Province using a completely randomized block design. A comparative study was conducted on the continuous 5-year-old height and diameter at breast height (DBH) of new clones in the two plantations. As well, based on genetic correlation over the years of testing of these clones, a preliminary study of early selection was carried out. Results indicate that the growth traits of the new clones in Weixian were better than those in Wuzhi The traits show weak correlation between the two plantations. In some stands, the height, DBH and seedling volume of 5-year-old clones presented statistically sig-nificant differences among clones. In both plantations, the new clones showed over 0.6 repeatability of beight, DBH and volume, as well as larger coefficients of variation (CV). The fact that these clones achieved the largest repeatability and CV in the second year suggests that these traits are highly controlled by heredity. Thus, based on the growth traits of the second year, the new clones B305, B307, B303, H75, BT18, BTI7 and 21J-1 were considered suitable in Weixian. hi Wuzhi, the new clones had variable repeatability and CVs in various years and their correlation of growth traits among different years was not high. We conclude that early selection of new clones was not feasible in Wuzhi. 相似文献
2.
ZhangZihui ZhangZhiyit LinShanzhi LiXinguo 《中国林学(英文版)》2003,5(2):23-29
Effects of seven planting densities on the growth and tree form of nine 5-year-old new clones in Populus tomentosa were studied. The plantations, arranged with completely random block design, were located in Wuzhi County, Henan Province.Results indicated that effects of planting density on the diameter at breast height (DBH), individual volume and growing stock increment of all new clones in P. tomentosa were significant at the 1% level of probability, effects of planting density on the tree height increment of new clones B2 and B31 and on the live branches height (LBH) increment of new clones B5 and B30 were significant at the 5% level of probability, while the interaction between planting density and clone was not significant at the 5% level of probability. It was concluded that the degree of differences among new clones within the same planting density was different with different planting densities and traits. For short rotation industrial timber, clones B 1, B3, B4, B5, B7, B9, B31 were suitable with the density of 1 000-2 500 trees per hectare, while for bigger diameter timber, clones B1, B3, B4, B7, B9, B31 could be used with the planting density of 660-833 trees per hectare. Clonal repeatability was also different in different planting densities. 相似文献
3.
[目的]对香椿无性系的苗期生长进行分析,筛选优良香椿无性系,奠定遗传改良的基础。[方法]以49个香椿无性系为对象,分别于2015、2016、2017年测量其1、2、3 a生株高、胸径,计算材积,对表型性状及其增长量进行方差分析和遗传参数估算,采用独立淘汰法筛选排名前20%的无性系为优良,对中选无性系进行遗传增益等参数估算,并将试验地不同年份特征气象因子与无性系表型性状进行相关分析。[结果]株高、胸径及材积的生长连续3 a在无性系间存在显著差异,且生长性状的遗传变异系数、表型变异系数逐年减小,而变异幅度、重复力逐年增大;3 a生时,株高、胸径及材积的无性系重复力分别为0.55、0.50、0.67,重复力高。2015—2017年,49个香椿无性系之间胸径、材积增长量分别呈显著、极显著差异,3 a生材积与材积、胸径增长量呈高度正相关关系。以3 a生香椿无性系材积及其增长量为2组指标,独立筛选出优良无性系10个,中选无性系群体平均材积大于0.010 4 m~3·株~(-1),增长量大于0.009 7 m~3·株~(-1)。3 a生材积的遗传增益为17.38%,中选香椿无性系的稳定性系数b值均大于1,对年份环境敏感。气象因子-表型性状相关性分析显示,材积与年总降水量、日均降水量有显著正相关关系。[结论]参试香椿无性系间材积差异极显著,选择潜力大;中选的优良香椿无性系遗传增益超过15%,但其在不同年份差异大且稳定性差,这可能与年份降水量有关。 相似文献
4.
杉木无性系生长和材性变异及多性状指数选择 总被引：11，自引：0，他引：11
对19年生和17年生2块杉木无性系测定林开展生长和材性变异及多性状指数选择研究,其中,19年生测定林包括38个参试无性系,17年生测定林包括102个参试无性系。2块测定林数据分析结果均显示:无性系树高、胸径、单株材积、心材率和木材基本密度存在极显著的遗传差异,无性系重复力达中等偏上至较高水平,遗传变异系数各性状间差异较大;树高、胸径、材积生长性状间存在极显著的表型和遗传相关,与基本密度存在弱负相关。不同选择方法的结果表明,指数选择能整体提高单株材积、心材率和木材基本密度综合的遗传增益,达到比单性状选择更好的选择效果,是多性状改良较理想的选择方法。 相似文献
5.
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
6.
对来源于湖南省的38个杉木无性系在广西柳州市21年生试验林各生长性状进行了调查与分析,发现中林龄杉木无性系间的胸径、树高、单株材积及树冠指标生长量均存在显著或极显著的差异;无性系树高、胸径、材积、枝下高、冠长及冠幅等性状重复力为58.65%87.19%,均达50%以上,表现为中等以上重复力,说明杉木无性系生长性状及树冠性状具有较高的遗传稳定性;无性系生长性状胸径、树高及材积与树冠性状冠长、冠幅均呈显著或极显著正相关;从38个供试杉木无性系中筛选出88号、68号、300号等3个优良杉木无性系,单株材积分别达0.494 8、0.438 9、0.412 9 m3,较优良种源、改良代种子园种子及优良家系组成的5个实生对照平均值分别高出43.59%、27.37%和19.82%。 相似文献
7.
山东省长清县３６个８年生美洲黑杨无性的木材基本密度、纤维长度，树高和胸径在无性系间的变异达极显著水平，用选优法选出５个密度较高，纤维较生，生长较快的优良无性系，它们的引种号分别是１３号，３号，３４号，２２号和８号，除２２号起源于加拿大外，其余均起源于美国，木材基本密度，纤维长度，树高和胸径的广义遗传力分别为０．３２、０．４０、０．４３和０．７１，材性和生长性受中等或较强遗传控制。树木生长速度分别与 相似文献
8.
[目的]本研究考察了灰楸无性系生长(树高、胸径、单株材积)和形质(分枝度、分枝角、冠幅、树皮厚度、尖削度)性状,为灰楸优质用材良种选育和定向培育提供理论依据。[方法]以5年生灰楸试验林33个无性系为材料进行多个性状的遗传变异分析、方差分析、重复力估算。利用主成分分析和隶属函数法综合选择优良无性系。[结果]灰楸树高、胸径、单株材积在无性系间差异显著或极显著,其重复力为0.456～0.592。灰楸形质性状中,平均尖削度P1和P3在无性系间存在显著或极显著差异,且具有中等大小的重复力(0.479和0.415)。遗传相关分析中,单株材积与冠幅、树皮厚度、平均尖削度P1等存在显著或极显著较弱的正相关,相关系数为0.178～0.263。针对不同育种目标,利用主成分评价和隶属函数法最终选择出特定的优良无性系。[结论]5年生灰楸无性系间各性状存在丰富的遗传变异,且生长性状受到中等的遗传控制,有较好的遗传改良潜力。灰楸无性系生长性状与形质性状具有独立性,可进行单独定向选择。灰楸无性系H3-1-9、H3-1-18、H3-1-10、H3-1-3、H3-2-16和H3-1-17可作为速生丰产良种;无性系H3-1-16、H3-1-19、H3-2-12和H3-2-9可作为优质用材的无性系;无性系H3-1-17、H3-1-10、H3-1-18和H3-2-16可考虑作为生长和形质综合改良的灰楸无性系在当地推广。 相似文献
9.
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
10.
木麻黄树种及种源试验研究 总被引：2，自引：0，他引：2
对木麻黄科6个树种在广东饶平进行引种试验,结果表明：6种木麻黄胸径、树高、通直度、保存率等性状存在着极显著差异,并具较高的遗传力。由方差分析及多重比较可知,滨海木麻黄、肥木木麻黄、休格尔木麻黄表现较差,生长缓慢、干形差、保存率也低于50%;粗枝木麻黄表现中等;细枝木麻黄、山神木麻黄及对照（短枝木麻黄）生长较好,适应性较强,适宜在广东沿海地区利用和发展。对细枝木麻黄8个种源、粗枝木麻黄9个种源进一步分析对比,结果表明：细枝木麻黄种源间性状差异极显著,且遗传变异系数较大,遗传力较高,选择潜力大,其中15574、13521种源表现最佳,并能获得较高的遗传增益,而13508、15601种源表现较差;粗枝木麻黄种源在树高、胸径2个指标上存在极显著差异,遗传力较高,但在通直度与保存率指标上差异不显著,遗传力较低,其中15938、15941种源表现较好,具有较高的遗传增益,其余种源表现一般。 相似文献
11.
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
12.
杉木无性系造林对比试验及重复力估测 总被引：1，自引：0，他引：1
引进浙江省12个杉木无性系扦插苗在Ⅱ、Ⅲ类立地的不同坡位上与福建省大田桃源国有林场初级种子园实生苗进行造林对比试验.结果表明,20 a生时12个无性系间在树高、胸径、冠幅、单株平均材积生长上均存在极显著差异,枝下高因造林密度原因差异不显著;不同坡位造林对无性系的影响,除冠幅显著外,其它各生长性状均极显著;与实生苗对比,适宜本地发展的杉木无性系首选57号、28号,其次为38号、A1、110号,可作为建立采穗圃的优良种源.无性系各生长性状重复力测算结果表明,20 a生时各无性系与原株之间的遗传特性保持极高的稳定性. 相似文献
13.
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
14.
[目的]开展西南桦无性系早期生长变异及生长节律研究,揭示其生长规律及适应性,为西南桦无性系选育及速生丰产林营建提供参考。[方法]以滇西地区20个无性系参试的3年生西南桦无性系测定林为研究对象,每月定期测定其树高、胸径,探讨各无性系的生长变异,应用聚类分析划分生长类型,运用有序聚类分析进一步揭示各类型无性系的生长节律特征,通过相关性分析探明影响生长节律的主要气象因子。[结果]20个西南桦无性系间树高和胸径差异极显著(P0.01),根据生长表现,可将其划分为速生、中等和慢生3种类型,其中,B3、A10、Q3、Q4、Q2无性系属于速生型,其树高、胸径年均生长量大多超过2 m和2 cm;与中等和慢生型无性系相比,速生型无性系的生长优势并非完全表现在速生期,其在缓生期和滞生期的生长优势更大;各类型西南桦无性系的生长节律基本一致,其树高生长高峰在7—9月,低谷为4月和12月;其胸径生长高峰为5、10月,8月和12月为低谷,尤以8月生长最慢,这与该月的日照时数低有关。[结论]在滇西地区,B3、A10、Q3、Q4、Q2等5个无性系生长最迅速,颇具发展潜力。从经营措施看,宜在树高、胸径生长高峰之前,即5月和9月加强幼林抚育施肥,促进林木生长。 相似文献
15.
To investigate genotype by environment interaction (G×E) for clones of radiata pine (Pinus radiata), clonal stability was
evaluated for growth and form traits from three trials in New Zealand and three trials in Australia. There were 215–245 clones
in common between pairs of New Zealand trials, 17–26 clones in common among Australian trials, while 32–52 clones were in
common between New Zealand and Australian sites. Clonal repeatability ( [^(H)]2 ) \left( {\hat{H}^{2} } \right) and type-B genetic correlations were estimated. The general trend across the six trials for clonal repeatability was that
[^(H)]2 \hat{H}^{2} was greatest for height (HGT) followed by diameter at breast height (DBH), stem straightness (STR), and branch quality score
(BRQ). Within New Zealand trials, there was little evidence of G×E for growth traits, but more for form traits. For DBH the
average type-B genetic correlation within New Zealand was 0.82; and for HGT, the average type-B genetic correlation within
New Zealand was 0.76. Within Australia, there was only one statistically significant type-B genetic correlation for DBH and
this estimate was high indicating that clonal ranks were similar on these two trials. Additionally, within Australia and between
regions type-B genetic correlations were generally high for form traits, at least for STR. One Australian trial (Trial 5)
showed relatively high clonal stability with the three trials in New Zealand indicating that the ranks of these clones were
relatively stable in both regions. From a clonal testing standpoint, these results suggest that stable clones can be identified
that perform well in both New Zealand and Australia. Improvements in both growth and form traits can be expected when radiata
pine clones are transferred between Australia and New Zealand within regions similar to those sampled in this trial series. 相似文献
16.
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
17.
[目的]在土壤有效P匮乏的立地条件下,揭示针叶N、P含量及其化学计量比与马尾松生长性状的相关性。[方法]以马尾松二代育种群体内30个无性系为试验对象,野外调查11年生时马尾松二代无性系树高、胸径等生长性状与针叶N、P含量及其化学计量比的相关性。[结果]结果表明:(1)各生长性状在马尾松二代无性系间差异显著,且无性系重复力较高,均达到0.95以上。马尾松成熟针叶和当年生针叶N、P含量及N/P在二代无性系间差异均达显著水平;(2)相关分析表明,马尾松二代无性系树高、胸径与成熟针叶和当年生针叶N含量、N/P均呈显著或极显著正相关,与成熟针叶N/P的相关系数分别为0.608 6和0.542 8,与当年生针叶N/P的相关系数分别为0.515 9和0.679 2;(3)基于主要生长性状、针叶N和P含量及其化学计量比,可将30个马尾松二代无性系聚为4类:类群1无性系树高、胸径等生长表现优良,成熟针叶N/P较高,而当年生针叶N/P相对较低;类群2无性系树高、胸径等生长表现较好,成熟针叶和当年生针叶N/P值在30个无性系中居中间水平;类群3占试验无性系总数的一半,树高、胸径等生长表现一般,成熟针叶与当年生针叶N/P相差较大,大部分无性系成熟针叶N/P较低,而当年生针叶N/P相对较高;类群4树高、胸径等生长表现较差,成熟针叶和当年生针叶N/P均较低。[结论]在贫P立地下,马尾松二代亲本无性系C13(7750×1126)和C14(3201×1123)各生长指标均较高,可能是通过调整当年生针叶和成熟针叶的养分分配,增加了当年生针叶对限制其生长的P素的再利用和再吸收,促进了N素的吸收,调整了当年生针叶和成熟针叶的N/P,以形成特定的养分分配机制。 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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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