共查询到20条相似文献，搜索用时 250 毫秒
1.
黑松为著名的海岸绿化树种,既能美化环境又起防护作用。同时是嫁接五针松,雪松等松类苗木的良好砧木。 以往培育黑松苗木多以撒播和条播为主。一般当年生苗高8.5厘米,平均根径0.186厘米,并有三分之二没有顶芽,要留床或移栽一年后才能做砧木或上山造林,这样费工费时。近年来运用芽苗移栽法培育黑松苗木,不但省工、省材物料(无需覆盖物),而且苗木长势好,一年生苗高可达9厘米,平均根径0.5厘米,有顶芽率为百分之百,当年生苗可上山造林,第二年无需再移栽即可做砧木。具体方法介绍如下: 一、处理种子 先将种子用清水浸泡1—2小时,清除泥土以及破碎种子后,再放入30％的双氧水中浸泡20分钟,取出晾干后即可播种。 相似文献
2.
3.
无患子移栽育苗双繁技术 总被引：2，自引：0，他引：2
无患子当年生苗移栽，由于木质化程度普遍不高，枯梢株多，影响苗木成活率和生长，通过对无患子当年生苗截干、扦插，提高移栽成活率和繁殖系数，移栽和扦插成活率分别达到97．5％、91．2％，繁殖系数提高5倍。 相似文献
4.
5.
通过采用不同苗龄杉木苗木进行造林试验,结果表明:2年生苗造林具有较大生长优势,造林2年平均树高生长量为2.99 m,平均地径为4.74 cm,是1年生苗木造林树高生长量的1.73倍、地径生长量的1.80倍,存在着极显著差异;2年生苗造林2年生长量是1年生苗木造林3年平均树高、地径生长量的1.11倍和1.05倍。在郁闭成林投入成本对比上,2年生杉木苗造林每667 m~2投入成本为1 884元,比1年生苗林造林成本每667 m~2节约了124元。 相似文献
6.
福建柏引种苗期研究初报 总被引：4，自引：0，他引：4
:连续2a进行福建柏引种育苗试验结果表明,在北亚热带南京地区引种苗期无严重冻害发生。当年生苗平均高128～148cm,最高单株260cm。2a生苗平均高4886cm,最高单株达700cm,其生长量和地上部分生物量与杉木苗相近。福建柏苗木根系分布深度大于杉木,但根系生物量较小,地上部分/地下部分较大。在遮荫条件下,当年生苗月高生长呈现两次峰值,分别在6月和10月出现;2a生苗月高生长仅有1次峰值,在9月出现。南靖、德化、仙游3个种源间种子千粒重和发芽率有极显著差异,但苗期生长与生物量性状差异不明显。 相似文献
7.
植物生长素在榆树育苗中的应用 总被引：1，自引：0，他引：1
在北方园林绿化中经常采用榆树（UlmuspumilaL．）１～２年生苗木作为绿篱。通常情况下榆树苗当年采种当年育苗，若采用１年生苗作为绿篱用苗时，苗木就显得比较纤弱。为了解决这一难题，我们对榆树１年生苗进行植物生长素喷施试验，以促进１年生榆树苗达到优质壮苗的需要。１试验地位置试验地设在牡丹江市郊区青梅试验站，该站位于东经１２９°４２'，北纬４４°４０'，年平均气温３．７℃，年降雨量４６０mm左右，生长期约１３０天。２试验内容和方法２．１采用GA３、维生素B２、氯化胆碱、高效植物生长素、叶面宝、爱多收、丰产素等。… 相似文献
8.
为了制定赣南八角苗木的分级标准,提高八角苗木造林质量,结合造林试验,开展以1~2年生八角苗木的苗高、地径指标为主的分级标准研究。结果表明,1年生苗木合格苗率低,出圃后造林成活率低,不宜出圃;2年生苗木合格苗率85%,造林平均成活率87.5%,均达到质量要求。经聚类分析,得出2年生八角苗木分级标准为Ⅰ级苗:苗高≥65 cm,地径≥0.74 cm;Ⅱ级苗:65 cm苗高≥45 cm,0.74 cm地径≥0.43 cm;Ⅲ级苗:苗高45 cm,地径0.43 cm。 相似文献
9.
10.
闽楠轻型基质苗木质量分级标准研究 总被引：3，自引：1，他引：2
为了提高闽楠造林质量,采用主成分、聚类分析、正态分布等方法研究了闽楠轻型基质苗木质量分级标准。结果表明:苗高和地径可作为闽楠轻型基质苗木质量分级指标,采用聚类分析方法与正态分布分级法,得到2种闽楠轻型基质苗木质量的分级标准。通过调查统计不同育苗圃地闽楠轻型基质苗木的生长情况,确定1年生闽楠轻型基质苗木质量分级标准为Ⅰ级苗,H≥35cm、D≥0.35cm;Ⅱ级苗,35H≥20cm、0.35D≥0.25cm。 相似文献
11.
12.
13.
对四川犍为地区引种栽培的互叶白千层扦插苗进行抽样调查,采用相关性分析、“x¯±s”法和主成分分析法对其苗木质量进行评价和苗木分级研究。结果表明:评定互叶白千层苗木质量可以苗高(H)、地径(D)和全株生物量作为表型指标,结合主根数量,并辅以根系长度作为辅助参考综合评价指标。提出了以苗高和地径作为该树种苗木分级的质量指标,并得出互叶白千层扦插苗的3级分级标准,Ⅰ级苗木:苗高>17.66 cm,地径>1.98 mm;Ⅱ级苗木:苗高为11.48~17.66 cm,地径为1.36~1.98 mm;Ⅲ级苗木:苗高<11.48 cm,地径<1.36 mm。可为互叶白千层苗木分级和筛选提供一定的理论依据。 相似文献
14.
Chrysomyxa rhododendri (DC.) De Bary is a needle rust with a host shift between Rhododendron sp. and Norway spruce (Picea abies (L.) Karst.), penetrating only the new developing flushes of the conifer. Because little is known about its effects on trees, we investigated several parameters related to photosynthesis in artificially infected 3-year-old Norway spruce seedlings. The potential efficiency of photosystem II (PSII; derived from chlorophyll fluorescence measurements) was reduced in infected current-year needles as soon as disease symptoms were visible, about three weeks after inoculation. Two weeks later, photosynthetic O(2) evolution (P(max)) of infected needles was less than 20% of control needles, whereas respiratory O(2) uptake (R(D)) was about three times higher than that of control needles. Nonstructural carbohydrate concentrations were about 60% of control values in all parts of the shoots of infected trees. Photosynthetic inhibition was associated with marked decreases in chlorophyll concentration and chlorophyll a/b ratio but only a small reduction in carotenoid concentration. In infected trees, P(max) of noninfected 1-year-old and 2-year-old needles was 50 and 80% higher than in the corresponding age class of needles of control trees. Estimation of potential daily net dry mass production, based on P(max), R(D), specific leaf area, carbon content and needle biomass, indicated that seedlings infected once were able to produce 60%, and those infected twice only 25%, of the dry mass of controls. We conclude that afforestation and regeneration of Norway spruce is seriously impaired in regions where seedlings are frequently attacked by Chrysomyxa. 相似文献
15.
通过N、P、K 3因素3水平的正交试验,探索配方施肥对盆栽椿叶花椒苗木生长及生理指标的影响.结果表明:(1)不同比例的N、P、K肥配施后,处理4至处理9对苗木各项指标均有极显著的影响,处理4有利于椿叶花椒苗木地径的增长,处理6对苗木的苗高增长最明显,处理5有利于生物量的积累,处理9有利于苗木叶片叶绿素含量、光合速率的提高;(2)N元素对椿叶花椒苗木生长和生理效应的影响极为显著,PK的影响很小;(3)根据N、P、K肥的施用量和苗木各项生长和生理指标测定值进行了二次函数关系方程的模拟,可据此分别求得各指标最大收获量所对应的合理施肥量. 相似文献
16.
无刺朝仓椒嫁接育苗试验研究 总被引：1，自引：0，他引：1
为探索无刺朝仓椒嫁接技术,以嫁接时间、嫁接方法、砧木类型为因素,开展了日本无刺花椒止止吕美系无刺朝仓椒的嫁接育苗试验研究,结果表明:(1)朝仓椒春季嫁接的最佳时间为2月下旬至3月中旬,最佳嫁接方法是单芽切接法,平均成活率为85.7%,最高94.1%;(2)朝仓椒夏季最佳嫁接时间为6月底至7月上旬,最佳嫁接方法是方块芽接法,平均51.6%,最高77.6%。(3)竹叶花椒和朝仓椒具有很强的嫁接亲和性,其中以狗屎椒为砧木的朝仓椒嫁接苗平均成活率、平均高生长量、平均地径生长量最高。 相似文献
17.
《Scandinavian Journal of Forest Research》2012,27(5):420-423
Abstract When Scots pine (Pinus sylvestris L.) seedlings are short-day (SD) treated in May or early June, height growth ceases but seedlings reflush within a few weeks and grow secondary needles (later referred to as early SD treatment). These “2-year-old-like” seedlings have been thought to be more stress tolerant than traditional 1-year-old pine seedlings, and thus suitable for summer and autumn plantings. To test this, seedlings sown in April were early SD treated over a 3-week period from the beginning of June and the seedlings were planted at 10-day intervals from the beginning of July until the end of September, and also during the following spring. Neither survival nor height growth of early SD-treated seedlings differed from untreated (1-year-old) seedlings. Moreover, for both early SD-treated seedlings and 1-year-old seedlings, those planted in summer grew and survived better after planting but had more multiple leaders than seedlings planted in autumn or spring. 相似文献
18.
19.
Biodiversity of arbuscular mycorrhizal (AM) colonization and AM fungal spores were studied in the roots and rhizosphere soils of Acacia catechu (L.f). Wild., A. mangium Willd, Anthocephala cadamba Miq., Artocarpus chaplasha Roxb., Chickrassia tabularis A. Juss., Swietenia macrophylla King., Tectona grandis L. from plantations; Albizia procera (Roxb.) Benth., A. falcataria L., Alstonia scholaris (L.) R. Br., Aphanamixis polystachya (Wall.) Parker., Hydnocarpus kurzii (King.) Warb., Heynea trijuga Roxb., Lagerstroemia speciosa (L.) Pers., Messua ferrea Linn., Podocarpus nerifolia Don., Swintonia floribunda Griff., Syzygium fruticosum (Roxb.) DC., S. grandis (Wt.) Wal. from forest and nursery seedlings of A. polystachya, A. chaplasha, Gmelina arborea Roxb. and S. cuminii (L.) Skeels from Hazarikhil forest, Chittagong of Bangladesh. Roots were stained in aniline blue and rhizosphere soils were assessed by wet sieving and decanting methods. The range of AM colonization varied significantly from 10%-73% in the plantations samples. Maximum colonization was observed in A. mangium (73%) and minimum colonization was observed in C. tabularis (10%). Vesicular colonization was recorded 15%-67% in five plantation tree species. The highest was in A. cadamba (67%) and the lowest was in T. grandis; A. chaplasha and C. tabularis showed no vesicular colonization. Arbuscular colonization was recorded 12%-60% in four plantation tree species. The highest was in A. mangium (60%) and the lowest was in A. cadamba. Roots of Artocarpus chaplasha, C. tabularis and T. grandis showed no arbuscular colonization. Among 12 forest tree species, nine tree species showed AM colonization. The highest was in A. falcataria (62%) and the lowest was in S. fruticosum (10%). Significant variation in vesicular colonization was recorded in seven forest tree species. The highest was in H. trijuga (52%) and the lowest was in L. speciosa (18%). Hydnocarpus kurzii, M. ferrea, P. nerifolia S. fruticosum and S. grandis showed no vesicular colonization. Arbuscular colonization was recorded in seven forest tree species. The highest was in A. falcataria (60%) and the lowest was in A. procera (10%). All the nursery seedlings showed AM colonization and the range was 10%-73%. Vesicules were recorded in G. arborea (40%) and S. cumini (40%). Arbuscular colonization was recorded in G. arborea (100%) and S. cumini (100%). Spore population was recorded 77-432/100 g dry soils, 80-276/100 g dry soils, and 75-153/100g dry soils in plantation, forest and nursery, respectively. Glomus and Acaulospora were dominant genera among the six AM fungi recorded. Significantly positive correlation was observed between AM colonization and AM fungal spore population in Hazarikhil plantation tree species, forest tree species and nursery tree seedlings. The present study showed the biodiversity of root colonization and AM fungi are active in nutrient cycling, survivals and seedling establishment of the plants in the Hazarikhil forest, plantation and nursery. 相似文献