共查询到20条相似文献，搜索用时 109 毫秒
1.
保鲜剂处理对切花康乃馨瓶插期生理的调节 总被引：2，自引：0，他引：2
本试验研究了不同保鲜剂配方对切花康乃馨品种“玛斯特”(Master)瓶插期间衰老的调节,主要是生理指标和瓶插寿命的测定,参数包括:鲜重、花朵直径、CAT活性、花瓣细胞膜的透性。结果表明,C(3%Sug+300mg/L8-HQC+500mg/LGlg+20mg/L6-BA)配方对延缓切花康乃馨的效果最好。 相似文献
2.
不同化学药剂预处理对小苍兰切花的保鲜效应 总被引：8，自引：0，他引：8
实验研究了STS、BA、8-HQ、蔗糖等化学药剂不同配方对小苍兰切花预处理的保鲜效果。对预处理的切花经置于鲜花专用箱内模拟贮运24小时后，取出于自来水中瓶插，观测其鲜重变化、瓶插寿命、单朵花期以及开花率。结果表明，处理E(BA1．0Mm 8-HQ250mg／L 蔗糖10％)，能明显提高小苍兰切花的瓶插品质其保鲜效果较好。 相似文献
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指出了切花菊多采取扦插繁殖的办法育苗,对不同基质、不同插期对切花菊扦插育苗的影响进行了探讨,研究发现:新黄壤土3份,细河砂2份,谷壳灰1份混合是最好基质;插期在6月下旬时,切花菊扦插育苗成活率和键苗率较高。 相似文献
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不同药剂对切花菊保鲜效果的研究 总被引：3，自引：0，他引：3
不同药剂对切花菊保鲜效果的研究张露，连芳青（江西农业大学林学院）关键词：切花菊，保鲜剂菊花（ＣｈｒｈｓａｎｔｈｅｍｕｍｍｏｒｉｆｏｔｉｕｍＴｚｖｅｌ）是我国著名的观赏花卉，位于世界四大名切花之首。随着我国人民物质生活水平的提高，对鲜切花的需求量日益增... 相似文献
6.
CaCl_2对非洲菊切花保鲜效果的研究 总被引：2，自引：0，他引：2
以浓度4 g/L、6 g/L、8 g/L、10g/L4个的CaCl2作为保鲜液,通过外部形态观察和生理指标测定,研究CaCl2对非洲菊切花瓶插保鲜效果。结果表明:CaCl2对延缓切花菊的衰老有一定作用,可比对照延长4 d瓶插寿命,增加花枝鲜重,减缓花瓣组织中蛋白质和糖含量的分解速度。各处理中以含8 g/L的CaCl2配方效果最好,可使切花非洲菊的瓶插寿命。 相似文献
7.
不同保鲜剂对非洲菊切花保鲜效果的研究 总被引：16，自引：0，他引：16
研究报道了几种不同质量浓度硝酸银、柠檬酸、蔗糖组成的保鲜剂配方在非洲菊切花上的应用效果及其保鲜的最佳配方。通过各种指标综合评定,以50 mg/L硝酸银 150 mg/L柠檬酸 50 g/L蔗糖对切花保鲜效果最好。 相似文献
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木本切花植物极美泰洛泊的组织培养研究 总被引：3，自引：5，他引：3
以木本切花植物极美泰洛泊在无菌条件下发芽所得的幼芽为外植体,采用正交设计试验,研究了不同水平的6-BA、NAA外源激素,蔗糖、抗坏血酸对极美泰洛泊幼芽丛芽的增殖效果。试验结果表明为在1/2 MS基本培养基上 6-BA0.5 mg/L NAA0.1 mg/L 蔗糖30 g/L 抗坏血酸15 mg/L,其极美泰洛泊的丛芽增殖数达6.7个。而经极差分析,得出用于该木本切花植物幼芽最佳丛芽增殖培养基的配方为1/2 MS 6-BA0.5 mg/L NAA0.01 mg/L 蔗糖30 g/L 抗坏血酸15 mg/L。 相似文献
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研究了不同水平NAA ,BA ,GA3及不同质量浓度绿叶宝 (LB)、花宝 (HB)和喷施宝 (PB)等无机营养物质对金线连芽增殖、芽及组织培养苗生长的影响。结果表明 :培养基MS NAA 0 3mgL BA 2 0mgL对金线连芽的增殖有很好的促进作用 ,MS NAA 0 3mgL 3 0mgLBA GA30 3mgL培养基有利于芽的伸长生长 ,而MS NAA 0 3mgL BA 2 0mgL LB2 0mgL培养基对金线连无根苗的生长较为有利 相似文献
11.
《Scandinavian Journal of Forest Research》2012,27(5):427-435
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
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《Scandinavian Journal of Forest Research》2012,27(3):206-217
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
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《Scandinavian Journal of Forest Research》2012,27(1):53-61
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
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《Scandinavian Journal of Forest Research》2012,27(1):15-27
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
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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
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《Scandinavian Journal of Forest Research》2012,27(5):472-479
Based on an enquiry, risk perception among non-industrial private forest owners is described in relation to climate change and forestry hazards. Of the respondents, 11% took action to remedy the effects of climate change. Out of a given set, hazards were ranked according to each respondent's experience of recent substantial financial loss to the estate and in relation to his or her willingness to make investments aimed at risk reduction. For each hazard, the respondent assessed the risk in four classes ranging from very high to negligible risk. Six hazards were considered most problematic in all three aspects: browsing damage, falling timber prices, damage by wind, spruce bark beetle, root rot and pine weevil. A majority of the respondents claimed to take action to reduce the risk associated with at least one hazard, while 35% did not know whether they did. Excluding climate change, the need for decision support was the largest in relation to damage by wind owing to a combination of perceived high risk and a high level of ignorance in relation to whether risk-reducing measures were taken. 相似文献
18.
Srisuda Thippayarugs Banyong Toomsan Patma Vityakon Viriya Limpinuntana Aran Patanothai Georg Cadisch 《Agroforestry Systems》2008,72(2):137-148
In situ produced plant residues contain a mixture of different plant components of varying quality. To assess synergistic
or antagonistic interactions occurring during the decomposition and mineralization of such mixtures, individual plant parts
(stems, leaves, leaf litter and roots) or the mixture of stems, leaves and leaf litter of the agroforestry species pigeonpea
(Cajanus cajan) or of crop residues of peanut (Arachis hypogaea) or of the weed hairy indigo (Indigofera hirsuta) were incubated in pots for 19 weeks. Periodically, remaining plant residues were sieved out (>2 mm), weighed and N content
as well as soil mineral N determined. Above- and below-ground residues of peanut decomposed fastest and showed the largest
N release in agreement with their high N concentration and low-acid detergent fibre (ADF) : N ratio. Hairy indigo was hypothesized
to be of lower quality than pigeonpea because of its high-polyphenol content. However, it decomposed faster than pigeonpea,
largely because of the higher N and lower lignin concentration of its components. Ranking of individual plant components for
N mineralization resulted in the following pattern, leaves > leaf litter > roots > stems. In mixtures of the different plant
components a similar species order in decomposition was obtained, e.g. peanut > hairy indigo > pigeonpea. The amount of N
released from the mixture was dominated by stem material that comprised 46–61% of the mixture. The interactions in mixtures
were relatively small for peanut (generally high-quality components) as well as for pigeonpea (low proportion of high-quality
components, i.e. N rich leaf material). However, a positive interaction occurred during later stages of N mineralization in
the mixture of hairy indigo as it had a significant proportion of N rich components and absence of highly reactive polyphenols.
Thus, for plants with low to intermediate chemical quality attributes, manipulating plant composition (e.g. by varying harvest
age, affecting stem and leaf proportions) will be important to obtain significant interactions during decomposition when its
components are mixed. 相似文献
19.
A. Rigueiro-Rodríguez M. R. Mosquera-Losada E. Gatica-Trabanini 《Agroforestry Systems》2000,48(3):245-256
The use of organic waste materials such as milk sewage as an organic fertilizer could have the dual advantages of organic-waste
disposal and reduced dependence on inorganic fertilizers. The effects of fertilization with (1) conventional mineral fertilization,
(2) milk sewage sludge at 40 kg N ha−1 target rate and (3) no fertilization on pasture production and tree growth were examined in an experiment consisting of two
pasture mixtures under a one-year-old Pinus radiata plantation with a density of 2500 trees ha−1. The two pasture mixtures were: (1) Dactylis glomerata L. var. saborto (25 kg ha−1) + Trifolium repens L. group Ladino (4 kg ha−1) + Trifolium pratense L. var. Marino (1 kg ha−1); (2) Lolium perenne L. var. Tove (25 kg ha−1) + Trifolium repens L. group Ladino (4 kg ha−1) + Trifolium pratense L. var. Marino (1 kg ha−1). The experiment began in the spring of 1995 using a randomized block design with three replicates in Castro Riberas de Lea
(Lugo, Galicia, north-western Spain). Plot size was 12 × 8 m2, with a 1 m buffer strip between plots. Two-year data showed that fertilization with either material had a positive effect
on pasture production, with no significant difference between the two fertilization treatments. Tree growth in the milk sewage
sludge plot was significantly higher than in the control plots. Inorganic fertilization increased pasture production, but
affected tree growth negatively. The results show that milk sewage sludge could be used as a fertilizer in silvo-pastoral
systems.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(2):166-178
This study investigated the forest history, structural characteristics, the presence of fungal species suggested to indicate ecological continuity in old-growth forest, and the species composition of saproxylic beetles in 30 old forest ''woodland key habitats'' (WKHs), and compared them with production forest in the same age-class in south-eastern Norway. No statistically significant differences in forest characteristics, community of saproxylic beetles or number of red-listed beetles were found between the WKHs and the production forest, probably owing to a combination of profound long-term logging and a lack of will to delineate sufficiently large WKHs in the one area with significantly less forestry impact. The study indicates the advantage of including forest history information in WKH selection where such data exist, and the importance of restoring habitats in heavily exploited forest landscapes. 相似文献