首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 78 毫秒
1.
采用2次重复的L_9(3~4)正交试验设计试验方法,分析不同浓度的混合灭菌剂与诱导激素种类对翅荚木扦插成活率、生根数量及主根长的影响。结果显示:不同浓度的混合灭菌剂与诱导激素种类对翅荚木扦插成活率、生根数量及主根长有显著影响,以300 mg·L~(-1)的多菌灵+恶霉灵+农用链霉素或500~800 mg·L~(-1)的百菌清+多福混合灭菌剂进行灭菌、800~1000 mg·L~(-1)的萘乙酸溶液诱导的翅荚木扦插效果为最好,其扦插成活率与生根数量相对较高,主根长相对较长。  相似文献   

2.
红翅槭扦插育苗技术研究   总被引:1,自引:0,他引:1  
红翅槭是一种优良的园林观赏树种,随着园林城市和美丽乡村建设的推进,市场需求一度呈激增态势。本研究采用L9(34)正交试验设计,研究了不同生根激素种类、浓度及处理时间组合对红翅槭嫩枝扦插成活率的影响。结果表明:激素种类对扦插的成活率影响最大,以ABT6的效果最好;其次依次为处理浓度和处理时间。最优方案为采用浓度1000(mg·L-1)的ABT6生根激素处理插穗15min后进行扦插。此法可以获得89.33%的扦插成活率。  相似文献   

3.
为了探索福建地区翅荚木栽培和管理方法,通过研究不同激素种类、激素浓度和处理时间对翅荚木的扦插育苗的影响,结果表明:3种因子对翅荚木扦插生根率、苗高和地径的影响均表现为浸泡时间>激素浓度>激素种类,激素种类对于翅荚木扦插影响不大,有利于提高翅荚木扦插幼苗苗高生长的最优组合为:100mg/L的ABT1#(IBA或者IAA)浸泡处理1 h,而有利于提高翅荚木扦插幼苗地径生长的最优组合则为:100mg/L的ABT1#(或IAA)浸泡处理1 h。  相似文献   

4.
格药柃扦插繁殖试验   总被引:5,自引:0,他引:5  
报道了山茶科植物格药柃(Eurya muricata Dunn)的扦插繁殖试验情况。结果表明,格药柃扦插繁殖适宜在春季进行,用50mg/L质量浓度的吲哚丁酸处理,其生根率达到59.5%。  相似文献   

5.
南方红豆杉扦插试验研究初报   总被引:10,自引:0,他引:10  
南方红豆杉是国家一级保护树种,具有观赏,用材,药用等多种用途,由于种源少,种子繁殖困难,我们进行了不同时间,不同基质,不同激素及不同激素浓度处理的扦插试验。试验结果表明,南方红豆杉扦插繁殖应选择在秋季进行,其扦插其质,激素及浓度的最佳组合为珍珠岩,采用500ppm浓度的吲哚丁酸通过12小时的浸泡,其成活率可达到95%。  相似文献   

6.
采用正交试验设计,对外源激素种类和浓度2个因素分别设置4个水平。最终4种不同外源激素种类及激素浓度对杜梨硬枝扦插繁殖的研究表明:嫩枝扦插选用浓度为600mg/L的外源激素CTK处理,硬枝扦插选用800mg/L的外源激素CTK处理,其扦插效果最好。  相似文献   

7.
小花忍冬是观赏性和抗逆性兼具的优良树种之一。为了解决其种子繁殖子代分化变异大的问题,结合小花忍冬特性,通过不同基质、激素及不同浓度的处理,对其进行了硬枝扦插试验。结果表明:基质种类、激素种类、激素浓度都直接影响其扦插成活率,激素种类直接影响地下根系的生长量。其中,使用珍珠岩︰沙子=1︰2、NAA、100 mg/L组合,...  相似文献   

8.
通过NAA、IBA不同激素浓度对硬枝扦插的影响试验和不同基质处理对嫩枝扦插的影响试验,结果表明:硬枝扦插时NAA∶IBA(1∶1)2000倍激素浓度成活情况良好,成活率达78%,适合硬枝扦插的激素浓度为NAA∶IBA(1∶1)2000倍;嫩枝在基质沙子中成活率最高,达到83%,适合嫩枝扦插的基质是沙子。  相似文献   

9.
楸树嫩枝扦插试验初报   总被引:13,自引:3,他引:13  
通过品种、激素种类、激素浓度、插穗类型等4因素3水平正交试验,进行楸树嫩枝扦插育苗试验,考察影响楸树生根的主要因子,结果表明不同楸树品种间扦插生根率差异较大。激素浓度为插穗生根的主要影响因素,其次是品种和激素种类,插穗部位影响较小。单因子试验分析表明1 000 mg/kg浓度处理比500 mg/kg浓度处理生根效果更好。  相似文献   

10.
本试验进行了华南厚皮香不同扦插时间,不同激素浓度及处理时间,不同扦插方式,不同扦插基质的技术研究。结果表明:3月扦插成活率最高,采用ABT 6号生根粉150 mg/kg浓度处理2 h能明显提高扦插成活率,容器袋扦插可大大提高扦插成活率,两种扦插基质对扦插成活率的影响差异不大。  相似文献   

11.

In Scandinavia, moose (Alces alces L.) sometimes cause severe browsing damage to economically-important pine. Moose-vehicle accidents have spurred construction of fences along roads, and these may interfere with moose migration between summer and winter ranges, or the road alone may be a barrier. If this happens and moose build up along roads, landowners may suffer economically. Therefore, this study investigated whether roads, fences or other factors influence the use of young pine stands by moose. Eighty stands along roads in northern Sweden were evaluated in which individually-browsed branches were counted on 9972 pines. Moose browsing was not significantly related to birch (Betula pendula Roth, B. pubescens Ehrh.) density, nor did it differ between pines (Pinus contorta Douglas or P. sylvestris L.). However, increased pine density, site productivity and proximity to a highway were associated with increased browsing. Further large-scale studies are needed to understand moose habitat selection and the effects of roads.  相似文献   

12.

The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture regimes. Seedling growth and physiology were evaluated periodically. Seedling survival was reduced when root damage reached levels of 60-80%. Root systems of all three species showed partial to total recovery by the end of the experiment. In general, root freezing damage caused reductions in seedling growth, with these reductions becoming less significant over time. Root damage had little to no effect on black spruce and jack pine seedling physiology, while white spruce CO 2 uptake decreased with increasing root damage. Shoot nitrogen content of all three species decreased slightly with increasing root damage.  相似文献   

13.
Contour hedgerows of multipurpose tree species in the sloping tea lands of Sri Lanka are expected to reduce soil erosion and also add significant amounts of plant nutrients to the soil via periodic prunings. The objective of this experiment was to characterize the biomass decomposition pattern and quantify the amount of nutrients added through prunings of six tree species (Calliandra calothyrsus, Senna spectabilis, Euphatorium innulifolium, Flemingia congesta, Gliricidia sepium and Tithonia diversifolia) currently being used in hedgerows associated with tea. Withered leaf and stem prunings (50 g) were enclosed in 2-mm litter bags, placed at 5-cm depth and retrieved after one, three, six, nine and 12 weeks. Loss of initial dry weight, N, P and K was measured. Single exponential decay function adequately described both dry weight and nutrient loss. Tree species differed significantly in their rate of breakdown with decomposition constants (k) varying from 0.0299 to 0.2006 week−1 for leaves and from 0.0225 to 0.0633 week−1 for stems. Gliricidia showed the highest k for leaves with the rest in the following descending order: Senna > TithoniaEuphatorium > Calliandra > Flemingia. A similar pattern was observed for loss of all nutrients with Calliandra and Flemingia always having lower k values than the rest. Although N immobilization was not observed, immobilization of P and K was observed during the first week of incubation in some species, particularly in stem prunings. Annual biomass of prunings differed significantly between tree species in the following descending order: Calliandra > Senna > Flemingia > Tithonia > Gliricidia > Euphatorium. Calliandra added the greatest amount of nutrients annually to the soil with Euphatorium adding the least. Calliandra prunings provided the annual total K requirement and 49% of the N requirement of mature tea. However, none of the species provided more than 5% of the P requirement. It is concluded that among the tree species tested, Calliandra and Flemingia are the most suitable for contour hedgerows in tea plantations of this agroclimatic region because of their higher soil nutrient enrichment capacity and slower decomposition rates which would minimize leaching losses. This revised version was published online in June 2006 with corrections to the Cover Date.  相似文献   

14.

The effects of seed weight and seed type on seedling growth of Pinus sylvestris (L.) were studied by seeding individually weighed orchard and stand seed in different mixtures under harsh (direct seeding in field) and optimal (seeding in nursery) conditions. In the nursery experiment an increase in the seed weight from 3 to 7 mg increased the seedling height by 10-27% and total weight by 27-113%, and decreased the height/diameter ratio by 5-6% after 2 yrs. With elimination of seed weight effects, orchard seedlings were 2% taller than stand seedlings in year 2. Without elimination of seed weight effects, orchard seedlings were 7-13% taller. In the field experiment an increase in the seed weight from 3 to 7 mg increased seedling height by 18-65%, stem volume by 81-274% and the number of top-buds by 23-34% in year 5. After elimination of seed weight effects, orchard seedlings were 7-13% taller than stand seedlings and without elimination of seed weight effects 20-21% taller after 5 yrs. Even after elimination of both seed weight and genetic effects orchard seedlings were 3-9% larger than stand seedlings in the field experiment. In conclusion, the influence of seed weight and seed type on growth traits and slenderness is highly significant and the influence seems to be greater in harsh conditions.  相似文献   

15.
Baobab leaves form an important part of the local diet in Sahel countries and elsewhere in Africa. Existing leaf nutritional data and agroforestry performance information are based solely on Adansonia digitata L., the baobab of continental Africa. The introduction potential of Adansonia species from the center of diversity in Madagascar and from Australia remains untapped. To assess this potential, the mineral contents and B1 and B2 vitamin levels of dried baobab leaves were determined for five-year old trees of A. digitata, A. gibbosa (A. Cunn.) Guymer ex D. Baum, A. rubrostipa Jum. & H. Perrier (syn. A. fony Baill.), A. perrieri Capuron and A. za Baill. grown in an introduction trial in Mali. Nutritional data were evaluated against survival and vigor to identify promising germplasm. Leaf vitamin and crude protein contents were highest in the Madagascar species, especially A. rubrostipa (B1 88 mg 100 g−1, B2 187 mg 100 g−1, protein 20.7% dry weight). However, the local species far outperformed the introductions in survival, tree height, basal diameter and resistance to termites. We suggest grafting as a way of harnessing the vigor of well-adapted local baobab varieties to the superior nutritional profiles of A. rubrostipa and others. Cross-species grafting tests in Adansonia were successful, thus creating new agroforestry possibilities with different scion/rootstock combinations.  相似文献   

16.
Abstract

Wood in general and wooden studs in particular are often distorted owing to uneven shrinkage during the drying process in the sawmill. Twist is often the most detrimental of all types of distortion, and it is caused by spiral grain in combination with variations in moisture content. For sawmills, the objective is to produce dried, straight boards, and one method of dealing with boards with excessive spiral grain is to sort them out and then dry them in a pretwisted position to obtain straight boards after drying. A model using the finite element (FE) method for the simulation of drying twist distortions was first calibrated against laboratory experiments in which boards were dried with and without restraints and pretwists. After the calibration, the FE results were compared with industrial test results for boards that were dried without restraints or with restraints with zero pretwist, i.e. straight restraints. The FE model used an elastic–ideally plastic material model to obtain permanent deformations. The calibration was to set the yield stresses so that there was a good match between FE results and results from the laboratory experiments. The comparison between the industrial test results and the FE results showed that the FE model is capable of realistic simulations of drying boards with and without restraints and presumably also pretwists.  相似文献   

17.
Heterobasidion parviporum and Heterobasidion annosum are widely distributed root‐rot fungi that infect conifers throughout Europe. Infection of conifer stumps by spores of these pathogens can be controlled by treating fresh stumps with a competing non‐pathogenic fungus, Phlebiopsis gigantea. In this study, growth of three Latvian strains of P. gigantea and the biological control agent ‘Rotstop’ strain was evaluated in stem pieces of Norway spruce, Scots pine, lodgepole pine, Douglas‐fir, Weymouth pine, Siberian larch and Sitka spruce. The growth rates of one H. parviporum and one H. annosum isolate were also measured in the same stem pieces. The growth rate of P. gigantea varied greatly in wood of different conifer species. It was higher in the three pine species, lower in Norway spruce and lowest in Sitka spruce and Siberian larch, and in Douglas‐fir, this fungus did not grow. The largest area of wood occupied by P. gigantea was in lodgepole pine. Growth of Latvian isolates of P. gigantea in the wood of Pinus and Picea species was comparable to that of the Rotstop isolate. Consequently, stump treatment with local P. gigantea isolates should be recommended. However, our results suggest that Douglas‐fir stump treatment against Heterobasidion by P. gigantea may be ineffective and other stump treatment methods should be considered.  相似文献   

18.

This study investigated the stand structure in pine, spruce and deciduous forests in the border district of Finland and Russia. A total of 46 mature forest stands was selected as pairs, the members of each pair being as similar as possible with respect to their forest site type, age, moisture and topography. The stands were then compared between the two countries by means of basal areas and number of stems. The proportions of dominating tree species were 2-12% lower, and correspondingly the proportions of secondary tree species higher, in Russian forests. The density of the forest stock was also higher in each forest type in Russia. The forests in the two countries differed most radically in terms of the abundance of dead trees. The amount was two to four times higher in Russian deciduous and spruce forests, and in pine forests the difference was 10-fold. The stand structures indicated that Russian coniferous stands, in particular, were more heterogeneous than intensively managed pine and spruce stands in Finland.  相似文献   

19.

The root collar diameter and the height:diameter ratio are of particular importance in container-grown seedlings where a high density in the containers may produce spindly seedlings. Temperature regimes and light quality are known to affect plant growth. The aim of this study was to identify responses in Picea abies (L.) Karst. seedlings grown with light providing different red:far-red ratios and under temperature regimes with alternating day (DT) and night temperature (NT) from negative (DT < NT) to positive (DT > NT) difference (DIF) between DT and NT. Experiments were conducted in controlled environment chambers and in a daylight phytotron. Only limited thermoperiodic responses appeared in P . abies seedlings with respect to seedling height and dry weight accumulation. The formation of terminal buds, however, was clearly delayed in seedlings grown at negative DIF. The results indicate a requirement for day extension light that is high in far-red, to prevent terminal bud formation under natural short-day conditions. An extended study should be conducted to clarify the minimum level of light intensity and the optimal light quality needed to prevent terminal bud formation under natural short-day conditions.  相似文献   

20.
本文分析了CAD在设计中引起的正面和负面影响,并进行了系统的阐述,从而使设计者在应用中能够保持客观的态度。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号