薄壳山核桃嫩枝扦插技术

以薄壳山核桃嫩枝为试验材料,分别比较了1、2年生实生苗,3、5年生嫁接苗等4种母树材料、5种不同扦插时间和6种IBA浓度处理的扦插生根效果。结果表明:在全光喷雾试验条件下,树龄、扦插时间、IBA浓度对扦插生根均有显著影响,以1～2年生实生苗上部生长70 d的嫩枝作插穗,使用4 000 mg/L浓度的IBA速蘸处理,扦插生根率最高,为78.34%～82.17%;使用8 000 mg/L浓度的IBA速蘸处理生根效果指数最高,为1.50。     

美国自由人槭嫩枝扦插育苗技术研究

以美国自由人槭嫩枝为试材,采用L(934)正交试验设计,研究了扦插床、生长调节剂、药剂浓度及处理时间等各种因素对自由人槭生根率、根数、根长的影响。结果表明:插床和生长调节剂对自由人槭生根率、根数、根长影响达显著水平,药剂浓度及处理时间只对生根率影响显著,对根数、根长影响不显著。遮阴棚内覆薄膜拱棚插床、吲哚丁酸200mg/L浸泡1h处理组合使自由人槭扦插生根率、平均根数达到最优水平,生根率达95%,平均生根数为3.3条。     

红花荷嫩枝扦插繁殖生长研究

以红花荷（Rhodoleia championii）嫩枝为试材,进行红花荷嫩枝扦插繁殖效应研究。结果表明：穗条保留部分叶片可显著提高穗条的生根率,其中带4个半叶片的穗条生根率最高,为86.7%,其次为带2个半叶片的穗条,生根率为84.4%;多菌灵不同浓度处理对穗条生根率有显著影响（P<0.05）,综合考虑,200 mg/kg浓度的多菌灵处理为最适宜浓度,生根率达81.1%;GGR生根剂处理可显著提高穗条生根率用（P<0.05）,穗条生根率均达80%以上;不同扦插基质对穗条扦插生根率有显著影响（P<0.05）,其中以纯黄心土作为扦插基质,生根率为80%,是最经济有效的扦插基质。     

色木槭嫩枝扦插试验初报

利用光照喷雾装置，采用ABT生根粉处理色木槭半木质化嫩枝，在不同基质内进行色木槭嫩枝扦插试验。结果表明适宜的激素处理与选用适宜的扦插基质，可提高色木槭的扦插生根率，最高可达90％。     

杂种马褂木嫩枝全光照喷雾扦插技术初探

采用全光照喷雾技术,进行了杂种马褂木嫩枝扦插繁育探索。选用不同扦插基质、不同浓度的IBA生根粉、不同木质化程度的插穗进行了对比试验,结果表明:在珍珠岩基质中,选用未木质化的顶芽做插穗,对插穗进行留半叶和摘心处理以及扦插用200 mg·L-1的IBA速蘸处理时,其扦插效果最好,生根率达到了81.7%。     

植物生长调节剂对沙枣嫩枝扦插生根的影响

以1 a生实生苗半木质化嫩枝插穗为材料进行扦插生根试验,采用速浸法研究不同质量分数的外源植物生长调节物质对其生根的影响。结果显示：在河沙基质上,选择适当质量分数的外源植物生长调节物质能有效地提高沙枣嫩枝插穗的生根率和生根质量,其中,以质量分数为200×10-6的ABT6溶液处理的效果最佳,生根率可达83.3％。     

Permeability and meniscus phenomenon in four Korean softwood species

1 Introduction A number of studies have been carried out to examine the process of liquid impregnation into different kinds of wood (Stamm and Raleigh, 1967; Bolton and Petty, 1978; Olsson et al., 2001). Different techniques and methods have been developed so far to obtain quanti- tative and qualitative information about this process (Stamm, 1953; Stone, 1956; Rudman, 1965). Penetra- tion of liquid in wood depends on several factors. The penetration rate and amount varies in different spec…     

外源激素对细柄阿丁枫嫩枝扦插生根的影响

以3年生细柄阿丁枫实生苗作试材,采用二阶非平衡巢式设计,研究外源激素种类及浓度对其扦插生根的影响,旨在为细柄阿丁枫无性繁殖提供指导.结果表明:外源激素种类及浓度对细柄阿丁枫嫩枝扦插生根均有极显著影响;扦插生根的最佳处理为300 mg/L NAA浸泡2h,各生根性状依次为生根率78.33％、根数23.73、根长4.26 cm,分别约为CK的3倍、6倍和4倍;就最佳处理而言,可将插穗生根过程分为3个阶段:0～20 d为愈伤组织产生期,≥20～30 d为不定根发生期,≥30～45 d为不定根大量形成期,各阶段均比CK提前15 d左右.     

饲料型四倍体刺槐嫩枝扦插试验初报

根据四倍体刺槐自根能力弱的特点,利用其嫩枝进行全光喷雾扦插繁殖。在同等试验条件下,与匈牙利刺槐进行对比,经多种激素处理,结果表明:1 a生苗的嫩枝较2 a生苗的嫩枝易生根,匈牙利刺槐较四倍体刺槐易生根;用甘霖1号速蘸发根剂处理的效果最好,生根率可达60%~88%。     

长白落叶松全光喷雾嫩枝扦插育苗技术的研究

在全光喷雾条件下,采用长白落叶松嫩枝进行扦插试验。结果表明,长白落叶松嫩枝扦插应在2a生幼树上采用地径(距切口3cm处)2 0～2 6mm、穗长10cm的嫩枝做插穗,从生根率、平均根数、平均根长等因素综合比较,用GGR6号50mg·kg-1、GGR7号150mg·kg-1溶液处理,插穗生根效果好,生根率稳定在85%～90%以上。     

植物生长素对东北红豆杉嫩枝扦插生根的响

以ABT-1^#、2．4-D、IAA、IBA、NAA5种植物生长素处理东北红豆杉当年生半木质化嫩枝,进行扦插生根试验,结果表明：嫩枝插穗扦插40-60d后在形态下端形成愈合瘤,并逐渐长出不定根,属于愈合组织生根型;在激素配比均为100×10^-6的条件下,经2．4-D处理的插穗生根率达到68％以上,经ABT—1^#和IBA处理的达到52％以上;采自幼龄植株的嫩枝插穗生根率高于老龄植株。     

白檀嫩枝扦插影响因素

研究了GGR处理、扦插基质、扦插时期等因素对白檀嫩枝扦插繁殖效果的影响。结果表明,白檀在5月中下旬扦插效果最好,生根快,成活率高,根径、根长最长相对较好,根数也达到要求;3种扦插基质均能较好地促进白檀生根,生根率均达到90%以上,其中以珍珠岩中生根数量最多,珍珠岩∶蛭石体积比1∶1中的根长最长,3种基质中的根径差异不明显。3种GGR浓度及处理时间均能较好地促进白檀生根,在根径、根长及根数等指标上的差异不明显;生根后的白檀春季移栽明显好于冬季。白檀嫩枝扦插适宜方案为:5月中下旬用300 mg/L的GGR处理插穗基部0.5 h后,扦插于蛭石:珍珠岩体积比1∶1的混合基质中,生根后的插穗于次年春季移栽。     

An efficient method for clonal propagation and in vitro establishment of softwood shoots from epicormic buds of teak （Tectona grandis L.）

Softwood shoots were produced from 40 cm long stem segments placed horizontally in flat trays containing sterilized sand under natural light or shade conditions for subsequent rooting and micropropagation studies in teak(Tectona grandis L.) . Higher number of shoots(6.17) per log was produced under natural light as compared to shade conditions. Forcing was also better in natural light as compared to shade in terms of shoot length,number of nodes or leaves. For rooting,2-4 cm long softwood shoots were excise...     

转双抗虫基因741杨嫩枝扦插苗抗寒性的研究

为研究转双抗虫基因741杨不同时期扦插苗的抗寒性,以5月、6月、7月、8月嫩枝扦插苗为试验材料,进行低温处理,测定生理反应和恢复生长能力。结果表明,7月、8月嫩枝扦插苗可溶性蛋白质含量低,-15℃以下低温相对电导率明显增高,枝条皮部逐渐变黑,芽失去萌发能力;而5月、6月嫩枝扦插苗对寒冷适应性较强,-15℃以下低温仍具一定恢复生长能力。     

An efficient method for clonal propagation and in vitro establishment of softwood shoots from epicormic buds of teak (Tectona grandis L.)

Softwood shoots were produced from 40 cm long stem segments placed horizontally in flat trays containing sterilized sand under natural light or shade conditions for subsequent rooting and micropropagation studies in teak (Tectona grandis L.). Higher number of shoots (6.17) per log was produced under natural light as compared to shade conditions. Forcing was also better in natural light as compared to shade in terms of shoot length, number of nodes or leaves. For rooting, 2–4 cm long softwood shoots were excised and treated with either indole-3-butyric acid (IBA) or α-naphthyl acetic acid (NAA) at 0, 1000, 2000 or 3000 μmol·L^–1 each or with combinations (1000 + 1000, 2000 + 2000 or 3000 + 3000 μmol·L^–1) and then placed in flat trays containing autoclaved sand at 25 ± 2ºC in 16 h photoperiod at 35 µmol·m^–2·s^–1. After 28 days, softwood cuttings treated with IBA + NAA (3000 + 3000 μmol·L–1) had highest rooting percentage (89.3%) with 5.5 mean roots. Shoot apex and nodal explants of softwood cuttings were pretreated with 0.1% (w/v) ascorbic acid, boric acid, activated charcoal, citric acid, glutamine or polyvinylpolypyrollidone (PVP) for 24 h to remove phenolic compounds before surface disinfestation. Glutamine (Gl) and PVP were equally effective resulting in 60% establishment of shoot apices on MS medium supplemented with 10 μmol·L–1 6-benzylaminopurine (BAP) + 5 μmol·L–1 NAA. Using shoot apices, highest (42.80) number of multiple shoots with 54.33 mm shoot length were obtained on MS + BAP (8.8 μmol·L–1) + IBA (2 μmol·L–1) after 45 days. Shoots were successfully rooted and acclimatized to greenhouse     

Trees,grasses, and weeds: species choices in farmed-developed contour hedgerows

Innovations intended to conserve soils and improve soil nutrient cycling have not been widely adopted because of technical problems and lack of fit with farmers' cricumstances. Research in Claveria, the Philippines, facilitated and monitored farmers' adaptation of contour hedgerows to fit their particular needs. Farmers tested different establishment methods and many hedgerow species. They initially planted a combination ofGliricidia sepium (a legume tree) andPennisetum purpureum. (grass). Later adoptors chose fodder grasses (especiallySetaria spp.) or naturally occuring vegetation in their hedgerows-either solely or in combination with other species, including weeds such asRottboellia cochinchinensis identified as crop problems. Upland rice and maize farmers who adopted contour hedgerows from 1987 through 1991 were interviewed in 1992. Although hedgerow-crop competition, grazing by neighbors' cattle, and added labor were problems, farmers viewed hedgerows as a way to reduce soil erosion and provide fodder. Farmers planting mulberry were disappointed after a silkworm project folded. Farmers now face the problem of soil nutrient depletion, leading to fallowing of fields with hedgerows and shifting to other parcels. A farmer decision tree model of the minimum necessary criteria for sustainable adoption of contour hedgerows is hypothesized.     

嫩枝扦插技术在紫薇种质资源收集中的应用

为更好地收集保存优质紫薇种质资源,从插穗运输过程保存方式、运输时间、扦插季节、插穗部位等方面探寻不受季节和路途远近限制的紫薇嫩枝扦插繁殖技术。试验结果表明:用泡沫箱加冰镇矿泉水保存嫩枝插穗是运输过程中保存嫩枝穗条的最佳方式;嫩枝插穗运输时间在3 d内的插穗生根效果最好;6月和8月紫薇嫩枝插穗生根效果最好;选择嫩枝穗条下部,特别是穗条下部带踵扦插将取得很好的效果。     

会计信息失真问题初探

分析了会计信息失真的原因,提出解决和防范问题的对策和建议。     

查找等高线高程值错误的技术研究

在形成数字高程模型过程中,查找错误的高程值的等高线是非常困难的。通过TIN模型来查找,提高了错误高程值的查找效率。     

生长调节剂及其浓度对大果榛子插条生根的影响

为给大果榛子嫩枝扦插中生长调节剂及其浓度的选择提供参考,以4年生大果榛子品种‘达维’嫩枝为材料,使用4种质量浓度800、1 000、1 200、1 400 mg/L IBA和ABT1处理插条,研究植物生长调节剂种类及其质量浓度对大果榛子嫩枝扦插生根的影响。结果显示,当IBA质量浓度为1 200 mg/L时,插条的生根率和生根指数最高,分别达到74.81%,61.12 cm;当ABT_1质量浓度为1 400 mg/L时,插条的生根率70.15%,生根指数56.58 cm。生长调节剂种类、生长调节剂种类及其质量浓度的交互作用对生根率的影响差异不显著,质量浓度是导致生根率产生差异性的主要因素。生长调节剂、质量浓度以及两者的交互效应均对生根指数有显著影响。各因素对生根指数产生影响的强度由高到低依次为生长调节剂质量浓度、生长调节剂质量浓度×生长调节剂种类、生长调节剂种类。