共查询到20条相似文献，搜索用时 328 毫秒
1.
2.
ABT生根粉在干旱半干旱地区林木育苗中的应用研究 总被引：2，自引：0，他引：2
在干旱半干旱地区林木育苗中应用ＡＢＴ生根粉的试验研究，总结出３６种材木应用ＡＢＴ生根粉育苗的最佳处理组合及技术。ＡＢＴ生根粉不仅对提高苗木成活率有显著效果，对促进苗木生长发育也有明显作用，可使苗木发根早、生根多、根系发达、地上部生长量增大，有效提高单位面积产苗量和苗木质量。 相似文献
3.
红椿播种育苗技术试验，应用温水和植物激素溶液不同方法浸种，采用大田和容器不同的方式育苗。对不同生长状况的苗木进行观察和比较。试验结果表明：用植物激素溶液浸种育苗的苗木，比用温水浸种育苗的苗木种子发芽率高，苗木根系发达，萌芽力强，苗木生长快又整齐。种子发芽率能提高16％，平均苗木生长可增大9％，地径粗11％。 相似文献
4.
苗木质量分级与检测方法 总被引：6，自引：1，他引：5
苗木质量是影响造林成效的重要因素之一，质量好坏直接决定着造林成活率的高低和林分生长量的大小。合理地进行苗木质量分级，科学准确地检测苗木质量，对于提高造林成效起着重要作用。 相似文献
5.
6.
7.
8.
水溶性ABT生根粉用于马尾松容器育苗的研究 总被引：1，自引：0，他引：1
水溶性ABT生根粉6号、7号、8号分别配成20ppm、30ppm、40ppm、60ppm的浓度对马尾松进行浸种24h后播种试验。结果表明：出苗率可以提高12．5％～20．8％；苗木侧根数可以提高89％～279％；苗木地径提高50％～125％；苗木干重提高50％～100％；但苗木高一般没有什么差异；并且从外观上看，出苗整齐，生长旺盛，适宜推广。 相似文献
9.
通过扦插试验研究了由植物生长物质和树木菌根菌组成的复合制剂对108杨扦插苗成活率、苗高、地径、根茎比、菌根侵染率、毛根数、生物量、树体电容、叶绿素含量以及抗病性相关酶活性等指标的影响。发现复合制剂可以促进苗木的根系生长，苗木根系的毛根数、菌根侵染率及根茎比指标较对照有显著提高；可以促进苗木地上部分的生长发育，成活率、苗高、地径、生物量、叶绿素含量、长势等指标较对照均有显著提高；可以提高苗木的抗病能力，苗木的树皮相对膨胀度、过氧化物酶活性、多酚氧化酶活性及苯丙氨酸解氨酶活性较对照均有显著提高。经IBA溶液浸泡处理亦可有效提高苗木的生长，但整体效果不及复合制剂的最佳处理。初步确定了复合制剂的最有效成分配比及处理方法。 相似文献
10.
11.
为了保证日本落叶松造林后林相整齐,减少苗木分化,提高林分质量,确保尽快郁闭成林。2009～2011年间,开展了苗木分类造林对比试验。结果表明:无论用哪个类别的苗木造林其成活率和保存率没有太大区别;造林后连续3 a地径、树高新生长依次为:1 a生超级苗>2a生Ⅰ级苗>2 a生混合苗>2 a生Ⅱ级苗。造林时,一定将苗木进行分类,在2 a生Ⅰ级苗用完后,可采用1a生超级苗造林,不提倡混合苗造林。 相似文献
12.
Two-year-old, container-grown red spruce (Picea rubens Sarg.) seedlings from a New Hampshire seed source were exposed to 10 or 11 drying cycles in which the seedlings were not watered until their midday (1400 h) xylem water potentials averaged -1.57 MPa. Control seedlings were kept well watered to maintain midday water potentials of about -0.73 MPa. After the final drying cycle, the water-stressed seedlings were rehydrated and osmotic potentials were determined by pressure-volume analysis. Gas exchange at ambient CO(2) concentration (338 ppm) and at an elevated CO(2) concentration (838 ppm) was measured on both groups of plants as they slowly dried down. No osmotic adjustment or photosynthetic acclimation occurred as a result of the water-stress treatment and both groups of seedlings maintained photosynthesis to water potentials as low as -3.0 MPa. Twenty-four hours after rehydration, the water-stressed seedlings had photosynthetic rates as high as the control seedlings. Estimated stomatal limitation to photosynthesis was approximately 30% down to water potentials of -1.4 MPa, but increased steadily as water potentials decreased further. At ambient CO(2) concentrations (338 ppm) and water potentials averaging -2.45 MPa, photosynthetic rates of water-stressed seedlings were 15% those of well-watered seedlings, whereas when the same water-stressed seedlings were measured in the presence of an elevated concentration of CO(2) (838 ppm) their photosynthetic rates were 73% those of well-watered seedlings measured at an ambient CO(2) concentration (338 ppm). 相似文献
13.
14.
在温室条件下,用不同质量百分数的盐溶液(0.05%、0.10%、0.30%、0.50%、0.80%、1.00%)浇灌1 a生四翅滨藜扦插容器苗,测定苗木的有关生理指标和苗高,同时测定土壤含盐量,研究其抗盐性.结果表明,不同盐协处理的四翅滨藜苗木的水分生理指标、光合作用生理指标以及叶绿素含量与质膜透性等均未受到明显影响,苗木生长正常,即使在土壤含盐量高达1.48%的状况下,苗木生长也未受到影响.四翅滨藜具有极强的抗盐能力,建议在吉林省西部地区有计划地扩大四翅滨藜的引种栽培. 相似文献
15.
水曲柳苗木抗寒性培育研究 总被引：3，自引：0，他引：3
1997年5月在东北林业大学帽儿山实验林场开展了有机肥、化控物质处理及密度试验对水曲柳一年生幼苗生长和抗寒性影响的研究。结果表明：以猪粪作底肥，能明显促进苗木的生长，并表现出较强的光合作用和较高的束缚水指标；化控物质中以生物助长剂浸根、ABT浸根和GA 多效丰产灵茎叶喷施对苗木的生长有促进作用，束缚水指标仅次于施肥苗；三种密度的增大，其顶芽、地径随着增大。 相似文献
16.
17.
为揭示组培因子对草莓微繁殖苗植物学性状的影响,以草莓品种"丰香"为试材,研究了组培因子导致草莓微繁殖苗植物学性状的表现变化。结果表明:在生长季的大部分时间里,草莓微繁殖苗的株高、叶柄长和冠径,均比普通苗要小。在果实成熟期后,普通苗株高呈明显下降趋势。草莓微繁殖苗整个生长期中的4个主要物候期要比普通苗早2～3 d。而茎尖分化出的微繁殖苗的叶面积和植株冠径都要大于不定芽分化出的微繁殖苗。叶片再生植株移栽后的生长情况因不同品种而异。再生植株的生长势较差,在叶面积、叶柄长、株高和植株冠径上,都要低于正常继代培养的微繁殖苗。继代次数不同的微繁殖苗移栽到温室后,在植物学性状上表现出差异,表现为:继代8次的微繁殖苗>继代6次>继代10次>继代4次。这说明草莓的继代次数要限制在10以下才能满足生产上的要求,一般继代次数以5～10次为宜。 相似文献
18.
《Scandinavian Journal of Forest Research》2012,27(2):147-154
During the 1990s, there were serious outbreaks of the pathogen Lophodermium seditiosum on pine seedlings in Swedish forest nurseries, even though the seedlings had been treated with the fungicide propiconazole. The present experiment was carried out to evaluate two other fungicides, fluazinam and azoxystrobin, as possible alternatives to propiconazole. In the tests, which were all carried out in the same forest nursery, seedlings were treated with either propiconazole, fluazinam or azoxystrobin, and the proportion of needles with ascocarps of L. seditiosum and the number of ascocarps per needle were recorded over the following 2 yrs. Seedlings treated with azoxystrobin already appeared healthier than control seedlings in September of the first year, and by November all azoxystrobin-treated seedlings had fewer ascocarps per needle compared with control seedlings. In autumn of the second year, there were no ascocarps on seedlings treated with fluazinam or azoxystrobin, whereas seedlings treated with propiconazole had similar numbers of ascocarps to non-treated control seedlings. 相似文献
19.
为了指导河北省滦平县的苹果栽植,以3a生国光苹果苗木为试材,研究了不同栽植时期苗木的成活率及生长情况,结果表明,4月8日栽植的苗木成活率、下部小主枝上的长梢数分别为92.67%、9.26个,极显著高于4月15日和4月22日栽植的处理;新梢平均长度为39.93cm,显著高于4月15日和4月22日栽植的处理;单株长梢数13.73个,显著高于4月22日栽植的处理。4月15日栽植的苗木成活率、下部小主枝萌芽率、下部小主枝上的长梢数分别为75.67%、39.71%、7.58个,极显著高于4月22日栽植的处理;单株中梢数为14.95个,显著高于4月22日栽植的处理。3个栽植时期的地径、单株短梢数和叶丛枝数无显著差异。表明4月8日栽植苹果苗木的生长情况优于后面的2个时期,在滦平县4月份内栽植苹果苗木应越早越好。 相似文献
20.
Containerized black spruce (Picea mariana [Mill.] B.S.P.) seedlings of three different sizes (small, medium, and large) were planted in raised sand beds maintained under wet, moderately dry or dry watering regimes during the growing season. The small seedlings were of a conventional stock type. The two larger sizes were novel stock types grown in larger containers. Physiological measurements during the summer showed that the small and medium seedlings maintained nearly similar levels of gas exchanges and water status, but that the large seedlings had reduced net photosynthesis and stomatal conductance under all watering regimes. Analysis of dry masses showed comparable relative growth rates in the small and medium seedlings, but a small to null growth in the large seedlings. Examination of root relative growth rate under wet conditions revealed significant root growth in small and medium seedlings, but negligible growth in the large seedlings. It was concluded that increasing the shoot size of containerized seedlings can be achieved without increasing the susceptibility of the seedlings to water stress, as long as the vigour of the root system is maintained. 相似文献