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竹柏嫩枝扦插育苗试验初报 总被引:3,自引:0,他引:3
从竹柏树冠中、上部选取当年或1年生的嫩枝作插穗、,按不同时间、不同浓度的生长激素处理和不同的基质等3方面进行试验,结果表明:竹柏可以进行嫩枝扦插,且成活率高,最高可达98%以上;扦插时间以3月上、中旬最佳,其次是9月中旬;激素处理有利于竹柏扦插生根,但浓度不宜过大,浸泡时间不宜过长,以ABT-1号生根粉0.5h为宜;在基质选择上,应选择肥力条件、透气保水力等都较好的土壤。 相似文献
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杉木扦插繁殖的保幼技术 总被引:7,自引:0,他引:7
试验结果表明,用杉木优良家系实生苗造林和用第3代扦插苗造林,二者生长量很接近,7年生时单株材积分别为0.0459m^3和0.0463m^3;用杉木不同繁殖代数扦插苗造林,生长差异不同繁殖代数扦插苗造林,生长差异亦不显著;矮杆采穗圃坚持年年更新老杆换新杆,保持了采穗母株的幼年状态,坚持用其根际萌芽条的扦插苗营造矮杆采穗圃,能有效防止多代扦插繁殖引起的衰退。 相似文献
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紫薇香花品种‘香雪云’扦插实验结果说明:半木质化枝条与当年生枝条分别用不同种类生根素及不同浓度处理后,生根率之间的差异不显著。用85mg/L浓度的911生根素处理多年生枝条扦插后的扦插能力最强。另外,实验也说明春插比夏插扦插生根成活率高,用春季硬枝扦插来进行繁殖是非常高效的方法。 相似文献
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通过历史考察、文献研究和现场踏勘,深入研究雁山园的历史沿革和造园艺术,全面展示雁山园山水、岩洞等地质地貌的特征和植物配置、园林建筑的传统风格;从园林文化的继承和城市发展的角度呼吁名园保护,并提出修复构想。 相似文献
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内生菌根的分离培养研究(英文) 总被引:2,自引:0,他引:2
从三叶草 (Trifoliumrepens)、荔枝 (LitchichinensisSonn .)、大蒜 (Garlic)等根际土壤中筛选出内生菌根真菌的孢子 ,在自制的固体和液体培养基上进行人工培养 (Is、ILe及E) ,并将培养得到的菌根真菌接种尾叶按 (Eucalyptusurophylla)无菌苗、玉米等植物 .结果表明 :以上三种植物根际分离的内生菌根在各种培养基上均长出白色菌落 ,随后均长出白色的丝状体 ,形态、大小基本一致 ,将其接种植物一定时间后 ,可在幼根皮层细胞观察到内生菌根特有的孢囊、丛枝现象 ,再从接种植物根部以同样的方法分离培养 ,亦得到形态、结构相同的菌根真菌 .根据培养菌根的特征推断 ,初步认为该内生菌根为球囊霉属 (GlomusTul. 相似文献
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在分析森林旅游产品基本内涵的基础上,充分考虑森林旅游产品的特征、发展趋势等因素,总结出森林旅游产品的开发模式,即以可持续发展为原则、以主题定位为理念、以产品创新为核心、以休闲体验为重点、以乡土开发为特色。以期对不断发展的森林旅游产品开发及经营提供建议和参考。 相似文献
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A theory of the shrinkage of wood 总被引:3,自引:0,他引:3
I. D. Cave 《Wood Science and Technology》1972,6(4):284-292
Summary A relation describing the shrinkage properties of a fibre-composite is applied to a multilayered thin-walled model of wood. With the theory developed it is possible to specify shrinkage with respect to moisture content, as well as with factors involved in cell-wall geometry and composition. However, until more is known of the properties of the water-reactive matrix component of the composite it is only practicable to describe shrinkage with respect to the geometrical and compositional factors at the moisture-content of the stress free state. 相似文献
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Malte Pries Roland Wagner Karl-Heinz Kaesler Holger Militz Carsten Mai 《Wood Science and Technology》2013,47(4):685-699
Scots pine sapwood was acetylated with ethyltriacetoxysilane using acetic acid as a solvent and sulfuric acid as a catalyst. A weight percent gain (WPG) of 14 % and cell wall bulking of 7 % were obtained after 5 h of reaction time. Pine specimens were acetylated with acetic anhydride in the presence of 1 % ethyltriacetoxysilane, dihydroxy-functional siloxane, acetoxy-functional siloxane, amino-functional siloxane and non-functional siloxane, respectively. Acetoxy-functional siloxane induced the greatest reduction in water uptake with a water repellent effectiveness after 24 h of up to 62 % as compared to acetylated wood. WPG and cell wall bulking increased compared to solely acetylated wood with increasing concentrations of acetoxy-functional siloxane in acetic anhydride; anti-shrink efficiency, however, did not increase. Fungal resistance of pine sapwood and beech as well as mechanical strength properties did not change when 20 % acetoxy-functional siloxane was added to acetic anhydride compared to solely acetylated specimens. 相似文献
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ABSTRACTFluctuations in the ambient relative humidity are often cyclic of nature, composed of a wide variety of frequencies. Variations may be as fast as one minute or as slow as a complete season. A wooden object exposed to these fluctuations exchanges moisture with the air, resulting in a change in the local moisture content of the wood. Since moisture penetration is affected by the timescale of the changes in ambient conditions, so are processes caused by moisture content variations. Moisture content variations cause dimensional changes of a wooden object, which, if mechanically restrained, lead to a buildup of stresses and ultimately to damage. It is therefore important to predict the frequency behavior of moisture content and expansion in wood. In the presented study, experiments are conducted in which the moisture content and expansion of oak cubes with different sizes is measured during sinusoidal relative humidity fluctuations with different frequencies. The amplitude in moisture content and expansion is shown to be simply scalable based on sample size only. Derived diffusion coefficients are in agreement with literature values, although the experimental frequency behavior is shown to deviate qualitatively from diffusive frequency behavior. 相似文献
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重点分析了石漠化的主要成因、过程及环境效应.针对干旱、半干旱地区土地粗化和贫瘠化,生产潜力和生物产量、数量下降以及地质特点等,通过样地治理比较分析,提出了以生态修复为主,工程治理及移民搬迁为辅,调整产业结构的治理方针,进一步探索了石漠化治理模式. 相似文献
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基于玫瑰花瓣褶皱微表面特性仿生构筑疏水竹材的研究 总被引:1,自引:1,他引:0
本研究利用软印刷法以不同浓度的聚乙烯醇(PVA)为弹性印章,以新鲜红玫瑰花为模板,经过二次复形将玫瑰花表面微纳褶皱结构转印到竹材表面,制备得到具有类玫瑰花表面微观结构的疏水竹材。试样表面利用扫描电子显微镜(SEM)及水接触角进行检测,结果显示类玫瑰花竹材样品具有乳突状和凹槽状微纳米结构的粗糙褶皱表面。研究发现,以10% PVA为模板复形的竹材表面水接触角接近于新鲜玫瑰花瓣表面的水接触角数值,展现出良好的疏水特性。 相似文献
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蔡秀珠 《中南林业科技大学学报(自然科学版)》2006,26(2):51-54
采用分层切割法探讨了不同人为干扰强度对马尾松人工林林地上部分生物量及其分配的影响.结果表明:就林分单株生物量而言,马尾松人工林中的幼苗、幼树、小树的单株生物量随着干扰强度的增强而增加,而在中树、大树阶段,马尾松单株生物量大小与干扰强度成反比,在单株生物量分配率上看,不同立木级马尾松单株各器官生物量分配率与干扰强度无直接相关关系;就马尾松林分地上部分总生物量而言,轻度干扰有利于林分总生物量积累. 相似文献