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要]油松母树嫁接是油松种子园建设的一项重要工作。太行山林区先后完成了油松良种基地母树嫁接工作。从插穗采集、砧木选择、嫁接时间、嫁接方法及嫁接后管理等方面介绍了油松嫁接技术。 相似文献
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提高油松种子林结实的试验研究 总被引:1,自引:0,他引:1
为提高油松种子林的结实,通过对油松种子林的疏伐、土壤耕作施肥、树冠下地表覆盖不同坡向等对比试验,研究结果表明:经过疏伐、土壤耕作施肥、树冠下地表覆盖等技术措施,效果明显,为提高油松种子林的结实提供了科学依据。 相似文献
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影响油松种子林生长结实的试验研究 总被引:1,自引:0,他引:1
通过对油松种子林的疏伐、土壤耕作施肥、树冠下地表覆盖、不同坡向等对比试验,研究结果表明:经过疏伐、土壤耕作施肥、树冠下地表覆盖等技术措施,效果明显,为提高油松种子林生长结实提供了科学依据。 相似文献
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根据榆林市樟子松种子园建立以来的水分管理档案和抽样调查数据,分析了灌溉对母树生长及结实的影响。结果表明:灌溉能明显促进母树营养生长,也可在一定程度上提高结实数量。回归分析结果进一步表明降水量以及水热平衡关系是影响母树生长的主导因子。 相似文献
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A correlation between heterozygosity of genotypes and survival (fitness) was studied in eight natural populations of Pinus roxburghii through isozyme analysis using horizontal starch gel electrophoresis. Under each population, 20 mother trees of different
ages (30 to more than 100 years) were selected which were at least 50 m apart. From each tree, eight seeds were assayed for
eleven enzyme systems viz., Aconitase, Aspertate aminotransferase, Glutamate dehydrogenase, Isocitrate dehydrogenase, Leucine-amino
peptidase, Malate dehydrogenase, Menadione reductase, Phosphoglucose isomerase, Phosphoglucomutase, 6-Phosphogluconate dehydrogenase
and Shikimic acid dehdrogenase which were found to be encoded by 18 polymorphic loci. Genetic constitution of the mother trees
was determined by analysing endosperms and embryos separately. The number of alleles in the progeny (embryos) and the mother
trees varied from 38 to 42 and 34 to 37, respectively, in all the populations. Distribution of degree of heterozygosity and
fixation index for the progeny and the mother trees were calculated. The mother trees showed a substantial shift towards higher
degree of heterozygosity as compared to the progeny. Fixation index values were significantly higher and negative for the
mother trees as compared to the progeny, which revealed that heterozygosity was positively correlated with survival in P. roxburghii.
Application: Heterozygous geneotypes in tree species are shown to have better survival over homozygotes under diverse environmental
conditions. Every year, millions of Pinus roxburghii saplings are planted in India. However, the fact that survival is very low might possibly be due to inbred/homozygous plants
that suffer from fitness disadvantage. Our study indicates that heterozygotes have a better chance of survival under environmental
conditions. The use of heterozygotes should lead to effective establishments of Pinus roxburghii plantations. 相似文献
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采穗圃不同营建及管理技术对马占相思穗条产量的影响 总被引:1,自引:0,他引:1
通过正交试验设计研究母株不同定植株行距、不同截干高度及施用不同基肥种类对马占相思嫩枝及硬枝产穗量的影响差异。结果表明:母株以20cm×25cm定植株行距(A2)+施1 125kg/hm2硫酸钾复合肥(B2)+母株距根茎部位25cm处截干高度(C3)组合(A2B2C3)最好,对嫩枝及硬枝产穗量均最高。 相似文献
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为了探寻能促进云南三台核桃中幼树生长结实的技术措施,从而为云南核桃的提质增效提供理论依据,以树龄为10~15 a的三台核桃中幼树为研究对象,采用修剪、螺旋环剥、花前灌水这3种技术处理进行了为期2年的试验研究,调查和综合比较分析了不同处理的新梢发枝力、果枝率、新梢生长量、单株产量。结果表明:螺旋环剥处理,能增加母枝抽发的新梢数量,但对新梢的营养生长却有一定的抑制作用,能使其果枝率和单株产量均有提高,其平均单株结果数可达508.3个,增产效果明显;修剪处理,增强了中幼树的发枝力,增加了母枝抽发的新梢数量,增产效果也较明显;花前灌水处理,促进了新梢的长度生长和粗度生长,促进了其营养生长,对其果枝率和单株结果数均一定的促进作用,但增产效果不很显著。 相似文献
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本文对赤松天然更新的规律进行了调查,并对人工促进更新技术进行了研究。结果表明,赤松初果期为12a,盛果期为51a,公最大更新幅度为40m;更新幼苗幼树的70%以上集中分布在距母树9m或树高1.2倍以内。人工促进效果以拖拉机耙和人工耧地好;只要耧掉草皮,移栽7-8a幼树,3-4a就可达到更新指标;单位面积上培育母树的数量随时间长而减少。 相似文献