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1.
由于山新杨生根能力较差,常规硬枝扦插成活率特别低,经多年实践探索,通过采用阳光温室(或聚乙烯大棚),上覆遮阴网的扦插育苗方法,对山新杨进行硬枝扦插育苗,结果表明,在黑龙江西部地区的气候条件下,以浓度为1 000×10~(-6)萘乙酸溶液速蘸插穗,生根率可达70%以上,且根系发育好。15～20 d形成愈伤组织,40～50 d生根。 相似文献
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以白砂糖代替蔗糖,探讨白砂糖对大花萱草‘红运’试管苗生根生长的影响。将试管苗分为丛生芽芽块(不分切)和单芽两种,分别接种于含不同白砂糖浓度的生根培养基1/2MS上。试验结果表明:白砂糖对大花萱草试管苗生根率和平均生根条数有着重要的影响。不加砂糖培养的试管苗叶片变黄、细弱、生长势极差,无论是丛生芽还是单芽生根率均为0;2.5%的砂糖利于单芽生根,生根率达95%,平均根条数3.59条/株;3.5%的砂糖利于丛生芽生根,生根率达90%,平均根条数7.50条/块;丛生芽生根较单芽生根所需砂糖浓度要高;丛生芽生根在14～21 d生根速度最快,单芽生根在7～14 d生根速度最快。 相似文献
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为探究锐尖山香圆扦插育苗适宜的季节和基质配方,以一年生的锐尖山香圆枝条为试验材料,开展不同季节和不同基质的扦插试验。结果表明：锐尖山香圆不同季节和基质扦插生根成活率均达到90%以上,最高达98.66%（夏季、黄心土+轻基质+珍珠岩）。秋季生根时间最短,一般16 d左右开始生根,28 d左右全部生根;冬季生根时间最长,一般30～33 d开始生根,50 d左右全部生根。不同基质配方对锐尖山香圆扦插成活率的影响不显著,一年四季均可扦插。因此根据实际生产和造林的需要,锐尖山香圆可选择春季进行扦插繁育。 相似文献
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《四川林业科技》2014,(1)
对不同基质、不同生根液浓度与不同处理方法、不同扦插时间对美国红机枫硬枝插生根的影响进行了研究。结果表明,以2∶1的珍珠岩与黄泥土混合为最佳扦插基质,生根时间为35 d,生根率达到81.5%;植物激素采用50%吲丁.萘合剂附加谷氨酸、肌醇,使用浓度分别为150 mg·L-1和1 000 mg·L-1,用浸泡2 h和蘸泥浆两种方法处理插条,其中浓度为1 000 mg·L-1插条蘸泥浆,生根时间30 d,生根率达到82.7%;浓度为150 mg·L-1浸泡插条2 h,生根时间32 d,生根率61.3%;扦插时间以2月上、中旬为最佳,生根时间为28 d,生根率达到85.1%;3月上旬扦插的反而生根时间长,40 d以后才发现有新根长出。 相似文献
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为探究不同类型铁线莲扦插生根能力差异,以4个大花铁线莲品种(‘蓝光’、‘黎明的天空’、‘胭脂扣’、‘钻石’)和齿叶铁线莲、东北铁线莲为试材进行扦插对比试验。结果表明:6种铁线莲均为愈伤组织生根型,生根时间约30d,差异不大;平均生根率20.57%～86.20%,具有极显著性差异,以大花铁线莲品种‘黎明的天空’最高,‘胭脂扣’最低;平均生根数差异不显著,介于3～3.58个;不同品种的平均根长差异不显著,介于3.83～4.29cm;ABT能够有效的提升铁线莲扦插成活率,加快生根进程,增加了生根数与根长,以500mg/L浓度最优。 相似文献
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《热带林业》2020,(1)
通过研究梅叶冬青插条不同粗细程度、ABT-1生根溶液浓度、土壤基质类型对插条生根率的影响,选择最优的处理组合。研究结果表明:随着扦插时间的推移,扦插68d后,5.5cm～10cm插条的生根率高于3.5cm～5.4cm和2.0cm～3.4cm的生根率;ABT-1溶液浓度对插条生根率的影响随着扦插时间的增加而变化,扦插40d,生根率随着溶液浓度的增加先减小后增加;扦插68d后,生根率随着溶液浓度的增加先增加后减少;在扦插40d后和68d后,采用河沙基质的插条生根率均大于壤土基质,但随着扦插时间的增加差距在缩小。最优插条生根率是3.5cm～5.4cm+1000mg/L+河沙的处理组合,生根率为72.7%,随着时间推移,5.5cm～10cm+1000mg/L+壤土、3.5cm～5.4cm+150mg/L+壤土这2个处理组合均有较好的生根率。 相似文献
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This study investigated the dynamic modulus of elasticity (DMOE) of wood panels of Fraxinus mandshurica, Pinus koraiensis, and Juglans mandshurica using the natural frequency measurement system of fast Fourier transform (FFT). The results were compared with the static
modulus of elasticity (E
S) tested by a mechanical test machine. The results show a significant correlation between E
S, transverse vibration DMOE (E
F), and longitudinal vibration DMOE (E
L). For all of these species, the correlation between E
S, E
F and E
L is more significant than the individual species, which indicated that the FFT method is universal. The correlations between
E
S and sample’s density (ρ) are significant, but the correlation coefficient of E
S and ρ is lower than those between E
F, E
L and E
S. The E
S of wood is more accurately tested by the analysis based on FFT measurement than by the estimation based on density.
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Translated from Scientia Silvae Sinicae, 2005, 41(6): 126–131 [译自: 林业科学, 2005, 41(6): 126–131] 相似文献
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Hitoshi Sakio 《Journal of Forest Research》2005,10(4):341-346
The effects of flooding on growth of seedlings were compared over a 7-month period (April–November) among six different woody species: Aesculus turbinata, Cercidiphyllum japonicum, Fraxinus platypoda, Pterocarya rhoifolia, Pterostyrax hispida, and Quercus mongolica var. grosseserrata. Flooding reduced the shoot length of F. platypoda, P. rhoifolia, C. japonicum, P. hispida, and Q. mongolica var. grosseserrata seedlings but did not affect that of A. turbinata seedlings. Among control seedlings, shoot elongation occurred once in A. turbinata and twice in F. platypoda and Q. mongolica var. grosseserrata; the other species continued to grow from April to August. Among the flooded plants of all species, shoot elongation occurred only once at the beginning of the growing season. On August 25, flooding significantly reduced the number of developed leaves as compared with control plants except for A. turbinata. In the flooded plants except for F. platypoda, leaf fall began on June 30; in controls, by contrast, the number of developed leaves increased until August 25. Flooding reduced the total dry weight increment in all species. The survival ratio of flooded plants after the experiment differed with species. All of the F. platypoda and A. turbinata seedlings survived the flooding treatment, while only 20% of P. hispida and 30% of Q. mongolica var. grosseserrata survived. Flooding seriously affected the growth of riparian pioneer species including P. rhoifolia, C. japonicum, P. hispida, and Q. mongolica var. grosseserrata. The effects of flooding on growth of the seedlings differed with the tree species because of differences in leaf-emergence pattern and physiological flood tolerance. The responses of tree seedlings to flooding reflected species habitats and growth patterns. 相似文献
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Bacterial blight is considered one of the most serious diseases affecting the genus Juglans. Artificial inoculations with Xanthomonas campestris pv. Juglandis were performed in the field by spraying seedlings of Juglans cinerea, Juglans hindsii, Juglans mandshurica, Juglans nigra, Juglans regia and Juglans sieboldiana. Juglans nigra, J. cinerea ana J. sieboldiana proved to be the most resistant. The multiplication ability of Xanthomonas campestris pv. corylina, X. c. pv. juglandis, and X. c. pv. campestris was evaluated by injecting 2-year-old seedling leaves of J. mandshurica, J. nigra and J. regia. The bacterial growth was monitored in the infected tissue over 12 days. Xanthomonas c. pv. juglandis exhibited a high growth rate and induced black greasy spots in J. mandshurica and J. regia; X. c. pv. campestris grew in leaf tissues without inducing symptoms, X. c. pv. corylina showed a very low growth rate. None of the tested bacterial strains multiplied in the leaves of J. nigra. This confirms the results obtained in the field tests. Juglans regia was the most susceptible among the walnut species tested. 相似文献
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[目的]分离并量化土壤自养呼吸和异养呼吸,探讨各自贡献率及其随季节变化的动态特征。[方法]采用壕沟法和气体红外分析法,研究黄河小浪底库区山地栓皮栎人工林土壤总呼吸、自养呼吸和异养呼吸速率的季节动态变化、贡献率和环境影响因子。[结果]表明:栓皮栎人工林总土壤呼吸、自养呼吸和异养呼吸均呈夏季速率高、冬季速率低。栓皮栎土壤总呼吸、自养呼吸及异养呼吸速率与5 cm土壤温度均呈极显著指数相关,温度敏感性系数Q_(10)值大小为自养呼吸(3.40)异养呼吸(2.90)土壤总呼吸(2.45);栓皮栎土壤总呼吸、自养呼吸、异养呼吸速率与0 10 cm土壤体积含水量均显著线性相关;土壤总呼吸、自养呼吸速率与0 10 cm土壤电导率显著相关。土壤总呼吸和异养呼吸的温度敏感系数Q_(10)值均在冬季最大,夏秋季最小;而自养呼吸的Q_(10)值则呈相反的变化趋势。栓皮栎人工林自养呼吸和异养呼吸对土壤总呼吸的月贡献率为13.23%37.33%和62.67%86.76%,且自养呼吸的贡献率与土壤温度的季节变化规律相似。土壤总呼吸、异养呼吸与自养呼吸的CO2年通量分别为1 616.41、1 199.39、417.02 g·m~(-2)·a~(-1)。[结论]经过区分与定量化土壤总呼吸及其组分,确定异养呼吸为本研究区栓皮栎人工林土壤总呼吸的主要组分,作用于异养呼吸的生物与非生物因子均能显著影响整个森林生态系统表层CO_2总排放通量的大小,进一步为该研究区森林生态系统碳循环与能量流动的进一步量化研究提供参考。 相似文献
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Wu Xingyin Zhang JinghuaForest Pest Control Quarantine Station of Archeng City of Heilongjiang ProvinceXiang Cunti Li Guisheng '''' Shao Zhongwen Liu Xiaoguang Ma LiyaNortheast Forestry UniversityZhang Xianwen Li Zhuo Xie Guicai Dang WenqiangArcheng Forestry Bureau of Heilongjiang Province 《林业研究》1991,2(2):7-16
The poplar bacterial canker caused by Erwinia sp is a serious disease spreading inmost parts of Northeast China,where poplars are cultivalted.The disease seriously infects thosepoplars belonging to section Aigeiros or the intersection hybrids of section Tacamahaca and section Aigeiros and their clones.Five fine poplar cultivars resistant to the bacterial canker have been ob-tained by screening tests.They are Lz_2(Populus simonii×nigra var.italica),A_(15)(P.×sp.)613(P.×sp.),A_(102)and A_(98)(P.simonii×sp.)T following chemicals are obviously effective,such as:50％DT germicide ,40％ XF-136 and 10％ C.C.M.A.or 12.5％ ramphencol and 50,000 ppm/mlvalidamycin,with which the stems or roots can be watered. 相似文献
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The technology of liquefying processed-waste bamboo with phenol is investigated by single factor trials and an orthogonal
design. We studied the preparation technology and properties of adhesives from this phenol-liquefied bamboo with formaldehyde
(BPF). The results show that temperature has a significant effect on liquefaction. The effect of the mass ratio of phenol
to bamboo comes second and the catalyst dosage within the range of 2%–4% is the least effective. The optimum conditions of
liquefaction are as follows: a mass ratio of phenol to bamboo 3.5, a catalyst dosage of 4%, liquefying temperature 145°C and
liquefying time 60 min. The liquefaction rate of bamboo reached 99.1%. For the preparation of the adhesive, a mass ratio of
liquefied bamboo products to formaldehyde (37%) is 100 to 164.8–199.5, while the ratio 100 to 108.2 is the best. This adhesive
has a lower curing temperature than that of normal PF resin. At a hot-press temperature of 130 or 140°C, this new adhesive
provides excellent bonding strength of plywood. The most favorable temperature for hot-pressing is 140°C.
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Translated from Chemistry and Industry of Forest Products, 2007, 27(6): 65–70 [译自: 林产化学与工业] 相似文献
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Summary The wood, composed of alternate earlywood and latewood lamellae, forms a statically indeterminate system with two redundants. The redundant forces are the shearing forces arising at the edge of the boundary between earlywood and latewood in the longitudinal and in the tangential directions of wood. By determining the redundant forces according to the theory of statically indeterminate systems, we know the state of stress and the state of detormation of the wood element and thus can determine its shrinkage and stresses in the longitudinal, tangential and radial directions.
Zusammenfassung Holz ist aus Früh-und Spätholzlamellen aufgebaut und bildet damit ein statisch unbestimmtes System mit zwei statisch unbestimmten Größen. Diese statisch unbestimmten Größen sind die Scherkräfte, die in longitudinaler und tangentialer Richtung an den Kanten der Grenzschicht zwischen Früh-und Spätholz entstehen. Bestimmt man die statisch unbestimmten größen nach der Theorie der statisch unbestimmten Systeme, so kennt man den Spannungs-und Verformungszustand der Gefügeteile des Holzes und ist damit in der Lage, scine Schwindung und Schwindspannungen in longitudinaler, tangentialer und radialer Richtung zu berechnen.相似文献
18.
大花葵花色苷抑菌功能研究 总被引：6，自引：0，他引：6
本项研究通过采用固体培养和液体培养的试验方法,进行大花葵花(Malvasylvestris)色苷对金黄色葡萄球菌、大肠杆菌和黑曲霉的抑菌试验。结果表明:大花葵花色苷对金黄色葡萄球菌有很强的抑制作用,而对大肠杆菌和黑曲霉没有抑制现象发生。在固体培养试验中大花葵花色苷随着浓度的增加,对金黄色葡萄球菌的抑制程度越大,当大花葵花色苷浓度为10g/L时抑菌圈平均直径为6mm,当浓度增加至30g/L时,抑菌圈平均直径为16mm。而且,高浓度的大花葵花色苷溶液对金黄色葡萄球菌有长时间的抑制作用。 相似文献
19.
Yingcheng Hu Fenghu Wang Jiyou Gu Yixing Liu Tetsuya Nakao 《Wood Science and Technology》2005,39(6):439-447
The effects of grain angle, thickness of face veneer, and shelling ratio on dynamic modulus of elasticity (E) of veneer-overlaid particleboard composite (VOP) were examined by using nondestructive test. In this study, the possibility
that E of VOP can be predicted by means of some empirical formula was also discussed. This study has shown that grain angle, thickness
of face veneer, and shelling ratio have substantial effects on E of VOP. The E at 0° of grain angle of face veneer was the largest, decreasing rapidly with increase in the grain angle. The lowest value
of E occurred at 90° of grain angle of face veneer. The relationship between grain angle of face veneer and E of VOP can be expressed in the form of Jenkin’s and Hankinson’s equations. The orthotropic properties of wood and VOP defined
as the ratio E
0/ E
90 were 25.7 for wood and 4.7 for VOP. When the grain direction of face veneer was parallel to the length of the specimens,
the E of VOP increased with increasing shelling ratio. VOP increased E from 125 to 179% over that of the particleboard and veneer thickness from 2.1 upto 3.6 mm. However, when the grain direction
of face veneer was perpendicular to the length of the specimens, the E of VOP decreased with increasing shelling ratio. VOP decreased E from 23 to 41% over that of the particleboard and veneer thickness from 2.1 upto 3.6 mm. The relationship between E of VOP and face veneer thickness can be expressed in the form of a second-order parabolic equation. Rule of Mixture (ROM)
can be used to predict E of VOP from the E of wood element and particleboard element. 相似文献
20.
落叶松水浸液对胡桃楸幼苗生长的影响 总被引：3，自引：0，他引：3
YANG Li-xue 《林业研究》2005,16(4):285-288
A study was conducted to detect the effect of water extracts from different parts such as root, bark, branch and leaf, of adult larch, Larix gmelini, trees on growth of Manchurian walnut, Juglans mandshudca, seedlings and the allelopathy between the two tree species. Four concentrations （100 g. kg i, 50 g. kg^-1, 25 g. kg^-1 and 12.5 g. kg^-1） were prepared for each kind of extracts. Result showed that the water extracts with low and moderate concentrations accelerated the growth of collar diameter and increased biomass and root/shoot ratio of walnut seedlings. The water extracts from branches and barks with low and moderate concentrations accelerated the height growth of the seedlings, while those from leaves and roots slightly decreased the height growth of seedlings. The fact that application of water extracts of larch improved the growth of Manchurian walnut attributes possibly to the allelopathy between the two tree species. 相似文献