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丁香属树状花木嫁接育苗技术 总被引：1，自引：1，他引：0
《内蒙古林业调查设计》2018,(6)
树状花木是指将灌木培育成主干单一、直立、光秃无分叉,主枝通常集中于主干上端的小乔木状造型植物。赤峰市林业科学研究院以暴马丁香(Syringa amurensis)为砧木,以白丁香(S. oblata var. alba)、紫丁香(S. oblata)或辽东丁香(S. wolfii)为接穗,进行丁香属树状花木嫁接育苗试验,取得良好观赏效果。丁香属树状花木是赤峰市园林绿化苗木新类型。文章从砧木培育、接穗采集处理、嫁接方法、嫁接时间及苗期管理等方面,总结了丁香属树状花木嫁接育苗技术。 相似文献
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园林树木的修剪是一项重要的技术。通过整形修剪可以提高观赏树苗移栽的成活率 ;使观赏树木的主干达到理想的高度和粗度 ;创造最佳环境美化效果 ;创造各种艺术造型 ;还可收获较多的鲜花或果实 ;促使观赏树体的健康生长。现将几种园林树木的整形修剪技术介绍如下 :一、丁香当幼树的中心主枝达一定高度时 ,根据需要留适当干高进行剪截 ,保留自中心主枝上所分生强健的枝４～５个 ,使其上下错落分布 ,间距１０～１５厘米 ,各占一定方位和空间 ,互不重叠 ,这几个枝要作为主枝培养。为使主枝继续延长 ,不断扩大树冠 ,必须短截主枝先端 ,剪口下留一… 相似文献
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紫薇,树形优美,花色独特,是现代园林著名的观赏树种之一。紫薇树对生长环境要求不严,大树截干移植容易成活,但树冠恢复较差,严重影响其观赏价值。通过对截干紫薇树嫁接恢复树冠的研究发现,截干后用劈接嫁接紫薇恢复树冠最为理想。现将其技术总结如下。一、移植前准备工作对于树 相似文献
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以黄檗3 a生幼树为材料,对不同栽植密度的生物量进行研究,结果表明:栽植当年和翌年秋季的成活率与保存率分别为92%和91%。不同株距树高、地径生长量均达到极显著差异(P0.01),树高、地径生长量从大到小顺序依次为株距0.5 m1 m0.3 m1.5 m;而不同行距对树高、地径生长量均无影响。采用一元生物量模型计算生物量,总生物量最大的种植密度为33 300株·hm~(-2)(株行距0.3 m×1.0 m),可产生干物质3 930.06 kg·hm~(-2);最小的为3 300株·hm~(-2)(株行距1.5 m×2.0 m),干物质仅为344.08 kg·hm~(-2)。 相似文献
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We evaluated the effects of planting densities (500, 1,000,1,500 and 2,000 trees·ha-1) on tree growth performance (diameter atbase, diameter at breast height, and clear bole height) of two clones(RRIM 2020 and RRIM 2025) of nine years old plantations of rubber tree(Hevea brasiliensis Muell. Arg) in Malaysia. For the four planting densities of the two clones, basal area and diameter at breast height declined with increasing planting density. Clear bole heights were greatest at 1,500 trees·ha-1 and lowest at 500 trees·ha-1 for the clone RRIM 2020, andat 2,000 trees·ha-1 and 500 trees·ha-1 for clone RRIM 2025. We conclude that the ideal planting density is 2,000 trees·ha-1 for obtaining high volume of wood production and 500 trees·ha-1 for high wood quality. 相似文献
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Vindhya Prasad Tewari K. M. Mariswamy A. N. Arunkumar 《Journal of Sustainable Forestry》2013,32(3):213-229
Tectona grandis (teak) is one of the most important timber species worldwide and India is one of the major teak growing countries. Though some volume equations were developed in the past in India, merchantable volume equations (any top diameter or bole length) are not available. Moreover, the models developed were neither quantitatively and qualitatively evaluated nor validated with independent data sets. Hence, the objective of this study was to develop appropriate volume equations to predict total tree volume and merchantable volume for teak in Karnataka. Linear and non-linear equations were used to model the relationship of the volume with respect to diameter at breast height (dbh) and total height. Merchantable volume equations for estimating merchantable volume to any minimum top diameter or bole length have also been constructed. The equations tested mostly fitted well to the data. Other models developed elsewhere tended to underestimate the volume, especially at dbh ≥ 23 cm. The geometric cylinder volume equation, in combination with a stem form factor of .40, is widely used for teak in Karnataka but they were found to be less precise compared to regression equations when applied to the present data set. Model validation indicated that models should be calibrated with local data for greater accuracy in the prediction. 相似文献
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乳源木莲优质干材混交培育的研究 总被引：9，自引：0，他引：9
研究证实，乳源木莲生长迅速，树干通直圆满，较少病虫害，其木材密度超过同龄的杉木，乳源木莲早期生长缓于混交树种杉木，10a生左右进入干材速生期，16a生时干材料积接近杉木的3倍。这说明通过与杉木混交可以培育优质的大径阔叶材。乳源木莲侧枝形成分叉特性显著，适时的除萌修枝方能保证高质量干材的培育。研究发现，在南方低山丘陵区。影响澌昆交乳源木莲干材生长的主要生育地因子是坡度，缓坡地土层深厚，立地条件较好，乳源木莲干材生长最大，枝下高长，生长在下坡和半阴（阳）坡的乳源木莲之高径生长有高于其它坡位和坡向的趋势。根据林分密度和杉莲比之于乳源木莲干材培育的作用机理。应适当降低混交林的初植密度和单位面积乳源木莲的株数。采用3：1或更高的杉莲比混交造林，并通过适时的间伐，以达到枝下高长，径阶大的干材培育目标。 相似文献
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Estimation of accurate biomass of different forest components is important to estimate their contribution to total carbon stock. There is lack of allometric equations for biomass estimation of woody species at sapling stage in tropical dry forest (TDF), and therefore, the carbon stored in this forest component is ignored. We harvested 46 woody species at sapling stage in a TDF and developed regression models for the biomass estimation of foliage, branch, bole and the total aboveground part. For foliage and branch biomass, the models with only stem diameter as estimator showed greater R 2. For bole and aboveground biomass, the models including wood specific gravity or wood density exhibited higher R 2 than those without wood density. Also, the model consisting of wood density, stem diameter and height had the lowest standard error of estimate for bole and aboveground biomass. Moreover, the R 2 values are very similar among models for each component. The measurement error of height and the use of a standard value of wood density together may introduce more than 2 % error into the models. Therefore, we suggest using diameter-only model, which may be more practical and equally accurate when applied to stands outside our study area. 相似文献
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直干型大叶相思种子品质和幼苗质量的研究 总被引：1，自引：0，他引：1
对直干型和普通型大叶相思的种子品质和苗期质量的对比试验结果表明，直干型的种子品质优于普通型的；幼苗高，径生长量两者差异不显著，直干型苗期的死亡率较高，说明其抗逆能力较差。 相似文献
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经过近2年对野生槭树大苗装箱培育试验,结果表明,装箱培育方式育出的野生槭树绿化大苗从叶色、形态、生长状况、苗木质量上看,明显高于对照平地育苗,利润是平地育苗的8.5倍,同时装箱育苗中的起苗、运输、栽植等环节不受季节限制,绿化栽植成活率100%,市场前景广阔,有较高的推广利用价值。 相似文献