共查询到20条相似文献，搜索用时 531 毫秒
1.
为探讨白桦杂交子代家系在辽东地区的生长表现,对21个2年生白桦杂交子代家系在辽宁丹东地区生长性状的遗传参数进行了分析,结果表明:树高和地径生长在家系间差异达到了极显著水平,树高和地径生长均表现最好的家系为203、325、310和316。不同家系以及家系内生长性状的变异有较大差异,家系子代的生长受遗传因素的控制较高,树高生长表现最好的8个家系平均遗传增益为6.66%,地径生长表现最好的7个家系平均遗传增益为9.04%。以此为基础可以为白桦杂交子代的早期选择以及在辽东地区的推广应用提供理论支持。 相似文献
2.
通过对21个白桦(Betula platyphylla Suk.)杂交半同胞子代家系在辽东地区的生长和保存率的分析,结果表明:参试家系的树高、地径和保存率在家系间及区组间的差异均达到了显著或极显著水平,树高生长最好的家系为“203”“201”“325”“204”“310”“206”“316”和“315”,地径生长最好的家系为“325”“316”“203”“302”“313”“308”和“310”,保存率最好的家系“316”“319”“204”“310”“325”“206”“201”“203”“313”“315”“205”和“307”。3个性状均为最优的家系为“203”“325”“310”和“316”。家系树高和地径遗传力分别为0.73和0.77,这说明白桦杂交子代的生长受遗传因素的控制较高,便于未来开展家系间的生长性状评定。 相似文献
3.
乐昌含笑家系试验初报 总被引：1，自引：0，他引：1
对乐昌含笑17个家系1～2年生树高、地径、主干通直度、树冠浓密度和叶片大小等生长指标和形质指标进行测定与分析,结果表明：2个生长指标和3个形质指标在家系间的差异均达到不同程度的显著水平;生长指标具有显著的家系×地点互作效应,而形质指标的差异不显著;所有指标在地点间差异都达到极显著水平（P〈0．01）。早期树高和地径遗传力在0．60～0．86之间,受到较强的遗传控制。九曲水林场试验点所有参试家系的树高年平均生长量达0．90m,地径年平均生长量达2．23cm,是林分树高、地径年生长量最高的试验点,其中表现较好的家系有乐九4和乐九5;大坑山林场试验点稍次之,其中表现较好的家系有乐九4、乐九3、乐两15和乐两12;增城市林业科学研究所试验点年生长量较高的家系为乐两6。 相似文献
4.
5.
6.
[目的]对山苍子不同家系幼林生长性状进行遗传变异及稳定性分析,为山苍子优良家系选择及推广提供参考。[方法]以13个半同胞山苍子家系为材料,采用随机区组设计,分别在重庆万州、湖北京山和福建清流3个试验点营建家系试验林。对23年生山苍子幼林的树高和地径性状进行测定和多点联合分析,并采用AMMI模型对山苍子各家系的生长稳定性进行评价。[结果](1)山苍子家系的树高和地径在家系和地点效应上均达到显著(0. 01 P0. 05)或极显著(P 0. 01)水平,地径的家系和地点交互作用达到显著水平(0. 01 P 0. 05); 3个试验点树高和地径的表型变异系数为20. 98%～29. 27%,遗传变异系数为0. 62%～20. 35%,其中,地径的表型和遗传变异系数普遍大于树高;树高的家系遗传力为0. 003～0. 578,地径的家系遗传力为0. 455～ 0. 806。(2)综合双标图和稳定性参数得出:家系JY2和GX4地径表现较好且稳定性较高。[结论]山苍子家系的树高和地径在家系和地点间的差异均达到极显著水平(P 0. 01),存在丰富的遗传变异。在家系水平上,树高受低等到中等强度的遗传控制,地径受中等到高等强度的遗传控制。各家系在福建清流试点生长表现最好,湖北京山试点居次,重庆万州试点最差,其中家系JY2和GX4在3个试验点地径均表现较好且稳定性较高。 相似文献
7.
对24年生长白落叶松自由授粉家系子代测定林的研究结果表明，胸径、树高、材积3个性状在家系间都存在显著差异，通过对17个家系的生长性状分析，筛选出了170、120、501、322、153、274六个生长性状优良的家系，其胸径、树高、材积平均大于对照3．83％、7．23％、11．67％。 相似文献
8.
对福建省华安西陂国有林场江南油杉23个家系子代测定林幼龄林的生长遗传性表现进行分析,并对表现优良的家系进行早期选择。结果表明,2年生不同家系树高、地径和冠幅平均值分别为30.3 cm、4.7 mm和20.9 cm,3年生不同家系树高、地径和冠幅平均值分别为70.0 cm、15.2 mm和52.8 cm。不同家系的生长性状遗传变异系数均在10%以上,说明家系的变异比较丰富。不同家系的各生长性状遗传增益在3%以上,说明江南油杉幼龄林的生长受遗传因素的影响较大。同龄的树高、地径和冠幅生长极显著相关。通过综合分析,初步选出5个早期生长较好的家系,5个家系树高、地径和冠幅的平均值分别为78.6 cm、17.9 mm和56.6 cm,平均遗传增益分别为5.00%、6.60%和2.21%。 相似文献
9.
10.
11.
Populus tomentosa was crossed with P. tremuloidis, P. grandidentata, P. alba × P. grandidentata and P. alba × Ulmus pumila in order to maintain its rapid growth and high wood quality and improve its resistance to cold. Two methods were used to
increase the germination rate from 1.5% to 41.1% and the remaining rate from 1.7% to 44.2%. Forty crossing combinations were
conducted and 2 744 hybrid seedlings were obtained. MX4 × P. grandidentata (G-1-58), MX3 × P. tremuloidis (T-44-60), MX2 × P. tremuloidis (1-13-87-37) and MX2 × (P. alba × P. grandidentata) were regarded as superior combinations after analysis and selection. Thirty seedlings of these combinations and 11 triploid
seedlings identified by counting their chromosomes were selected as super plants.
[Supported by the Doctoral Foundation of Ministry of Education (Grant No. 200220022004) and the National “863” Project (Grant
No. 2002AA241071)] 相似文献
12.
福建沙县26年生杂种马褂木人工林生物量与生产力研究 总被引：5，自引：0，他引：5
通过对福建省沙县官庄国有林场26年生杂种马褂木人工林生物量与生产力及其生长过程的研究,结果表明:26年生杂种马褂木人工林平均密度、树高、胸径和林分蓄积量分别为915株.hm-2、25.54 m、30.2 cm和672.76 m3.hm-2,林分生物量和乔木层生物量则分别达473.58 t.hm-2和471.22 t.hm-2,乔木层各器官生物量所占比例大小顺序为:干(66.45%)>根(16.91%)>枝(16.64%);枝主要分布在12 m以上;与杉木相比,杂种马褂木生长较快,材积数量成熟龄短(18 a)。 相似文献
13.
用新旧剂型ABT生根粉处理马尾松种子 ,观察幼苗在造林后的表现 ,结果表明 :处理后的种子育苗造林 ,可提高造林成活率 ,对林木生长有持续促进作用。种子在 5 0× 1 0 -6的新剂型ABT8号溶液中浸泡 1 2h ,造林成活率最高 ;经ABT3号1 0 0× 1 0 -6、1 2h处理后 ,在树高生长上有良好的促进作用 相似文献
14.
利用4类松树杂种(火炬松×洪都拉斯加勒比松、火炬松×巴哈马加勒比松、湿地松×洪都拉斯加勒比松、湿地松×巴哈马加勒比松)在浙北7 a和6类松树杂种(火炬松×洪都拉斯加勒比松、火炬松×本种加勒比松、火炬松×巴哈马加勒比松、湿地松×洪都拉斯加勒比松、湿地松×本种加勒比松、湿地松×巴哈马加勒比松)在皖南9 a的树高、胸径和材积指标,研究了不同杂种在不同地点的生长表现。结果表明:不同杂种类型在不同地点的生长差异非常显著。在浙北余杭试验点火炬松×洪都拉斯加勒比松生长最好,其中材积增长超过对照40%的杂交组合有PTCH20、PTCH12、PTCH41、PTCH17、PTCH61和PTCH16共6个,全部是火炬松×洪都拉斯加勒比松,占该试验点所有杂交组合的11.11%;在皖南太湖试验点生长较好的杂交组合多为湿地松×古巴本种加勒比松,少量为湿地松×洪都拉斯加勒比松,同时该地区火炬松×洪都拉斯加勒比松杂种也有生长较好的杂交组合,该地区优良杂交组合(材积超过对照40%)包括PECC1-37、PECH12-9、PTCH13-24、PECC18-55、PECH42、PECC18-32、PECC10-6共7个,占所有杂交组合的28%,包括3个杂交组合类型(湿地松×本种加勒比松、火炬松×洪都拉斯加勒比松、湿地松×洪都拉斯加勒比松)。该结论和国内外关于杂种松的适应性及生长优势研究的结论基本一致,对我国南方不同地区发展速生杂种松具有参考意义。 相似文献
15.
《Southern Forests》2013,75(4):185-188
Eucalyptus grandis × Eucalyptus nitens (G×N) hybrid clones are selected to combine complimentary characteristics of E. nitens and E. grandis. G×N hybrid clones also have the potential to increase growth rates and provide adaptability to a changing climate. A series of three trials planted across a range of high-productivity, mid-altitude sites in the KwaZulu-Natal midlands was established to test the suitability of a suite of G×N hybrid clones. Seven commercially available G×N clones together with two widely planted pure species controls, Eucalyptus dunnii and Eucalyptus smithii, were chosen for this study. The trials were set out in random complete block designs with nine treatments and four replications set out in square plots of 25 trees. The trials were measured for diameter at breast height at 23 months and monitored for snow damage over two winter seasons. Snow was noted at the Baynesfield site and subsequent snow damage assessments were performed. Basal area per hectare was calculated for each plot as a function of diameter at breast height and survival. Significant differences were observed between G×N hybrid clones in both growth and snow tolerance. The top-performing clones significantly outperformed both pure species controls in terms of growth and snow tolerance. Early results indicate that G×N hybrids may be better suited to high-potential, mid-altitude sites exposed to light snow risk than the currently recommended pure species. 相似文献
16.
Estimating genetic parameters of parental lines through progeny testing and choosing good hybrid parents are important for genetically improving seed orchard trees. In this study, 24 tetraploid progeny seedlings were used as experimental materials, which came from test cross design: six tetraploid Betula platyphylla lines (Q33, Q13, Q103, Q19, Q83 and Q14) as female parents and four individual B. platyphylla diploid lines (F3, F4, F9 and F11) as male parents were crossed. Variance analysis of height, diameter, height-to-diameter ratio, and internodal distance showed that the differences between hybrid combinations reached highly significant levels. Using multi-objective decisionmaking, we performed a comprehensive assessment of the various hybrid combinations. Using a selection rate of 20 % of the standard, five hybrids were selected; their genetic gains in average height, diameter, height-to-diameter ratio, and internodal distance were 20.95, 6.07, 13.07 and 8.96 %, respectively. We also analyzed the combining ability and genetic parameter effect values of parents and hybrid combinations. The combined analysis revealed that Q13, Q103, Q33 and Q83 were superior females; F3, F4, and F9 were superior males; and F3 × Q13, F4 × Q83 and F9 × Q33 were superior hybrid combinations. The heights and diameters of these progenies were 22.49 and 11.48 % greater than average, respectively. 相似文献
17.
对 13个尾叶桉×细叶桉杂种、10个尾叶桉×赤桉杂种、1个尾叶桉× (尾叶桉×细叶桉 )杂种、1个尾叶桉种内控制授粉子代、5个尾叶桉母本的自由授粉子代和 1个尾叶桉×细叶桉F1自由授粉子代的比较研究表明 ,家系间树高、胸径和材积的差异均达 0 0 1显著水平。选择出优良杂种和子代 14个以及优良单株 12株。优良单株可以作为无性系比较试验的材料 ,优良杂种的优良单株可以用于建立下一世代的育种群体。这为优良杂种单株的无性系化和进一步的桉树杂交育种提供了有效的遗传材料。 相似文献
18.
ABT生根粉浸根造林应用研究报告 总被引：1，自引：0，他引：1
采用３号ＡＢＴ生根粉,共设１３个处理浸泡供造林苗木根系。结果表明,浓度３５×１０－６～７５×１０－６,浸根５０～６０ｍｉｎ,对马尾松造林成活率和当年抽高有极显著效果。浓度５０×１０－６～７５×１０－６,浸根４０ｍｉｎ对杉木当年抽高影响达极显著水平,但对成活率的影响不显著。 相似文献
19.
Pertti Pulkkinen Lu-Min Vaario Leena Koivuranta Niina Stenvall 《European Journal of Forest Research》2013,132(5-6):791-800
This study aimed to understand the interaction between temperature and genotype in terms of the effect on early seedling development of European aspen (Populus tremula) and various F2-aspen hybrids. We evaluated the response of 16 different European aspen and F2-hybrid families on seed germination, survival rate and seedling height in one- and two-family trials under three different temperature regimes. In one-family trials, higher germination and higher survival rates were observed in higher temperature (C1700), leading to taller seedlings. European aspen × hybrid aspen individuals (Asp × Hyb) had a higher survival rate and taller seedlings than Asp, Hyb × Asp or Hyb × Hyb individuals. The difference between Asp × Hyb and Hyb × Asp was pronounced. Both growth conditions and genotype (i.e., hybrid cross) had strong effects on germination, survival rate and height of European aspen and F2-hybrid seedlings. However, the interaction of genotype and growth conditions also had a significant influence on survival rate and seedling height, but not on germination. Two-family trials involving European aspen and F2-hybrids led to significant negative effects on germination and survival rate and also facilitation effects on seedling height. Similarly, genotype had strong effects on germination and survival rate. Different genotypes and traits affected survival rate and seedling height differently in different growth conditions. These differences were more pronounced in the warmest environment, i.e., 1,700 degree days. We conclude that introgression between F2-hybrids and local European aspen is likely in the current climate, and any warming will likely favor certain F2-hybrids, especially the most probable types (P. tremula × (P. tremula × P. tremuloides)). 相似文献