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1.
以绿色植物生长调节剂GGR6号40、80 mg·kg-12种浓度的溶液处理甘蒙柽柳插穗基部后进行扦插育苗试验,结果表明,用GGR6号处理甘蒙柽柳插穗,能显著提高插穗的生根率、成活率,促进根系和苗木的生长;2种浓度处理的插穗地径生长量分别比对照提高32%和30%,树高生长分别提高13.45和10.15 cm;不同处理对根鲜质量影响差异极显著,对侧根数影响差异显著,对侧根均长影响不显著。 相似文献
2.
为了探究不同生根剂对金叶复叶槭嫩枝扦插生根的影响,采用ABT2号、GGR6号和国光生根粉等3种生根剂,设置4个浓度梯度分别处理插穗,统计插穗生根率、平均生根条数及平均生根长度等指标,从而确定适宜的生根剂种类及其处理浓度。结果表明:在一定浓度范围内,3种生根剂均能显著促进金叶复叶槭插穗生根及根生长,其中,ABT2号在100 mg·L-1浓度下促进插穗生根效果最好,GGR6号在300 mg·L-1浓度下促进插穗根伸长生长效果最好。 相似文献
3.
2004～2005年在玉溪市林木种苗工作站对羊踯躅进行压条和扦插育苗繁殖,结果为压条繁殖7月中旬、选取2～3年生枝条、环割2/3、喷洒300mg·kg-1ABT6号生根粉,低压生根成活率最高85%,高压生根成活率最高80%;扦插育苗时间最佳为8月中旬,ABT6号生根粉处理浓度200mg·kg-1、最佳基质是60%珍珠岩+40%泥炭土和底层40cm的细河沙,最高生根率为28%. 相似文献
4.
利用正交试验法开展梅片树（Cinnamomum burmanni）嫩枝扦插繁育试验,旨在研究插穗类
型、生长调节剂种类及其质量浓度、基质类型等因素对梅片树扦插生根的影响。试验结果表明：插穗类
型、生根激素、激素质量浓度、扦插基质均会影响梅片树嫩枝扦插的生根性状,但影响程度存在差异;
生根率受插穗种类、生根激素、激素质量浓度、扦插基质 4 个因素影响,侧根数主要受到激素质量浓度
影响,不定根长主要受到激素种类、激素质量浓度及插穗类型影响。经比较分析,插穗类型采用带顶芽
茎段、生根激素使用 NAA : IBA=1 : 1 或 GGR、激素处理质量浓度为 100~150 mg/L、扦插基质使用黄心
土的生根效果较好,平均生根率达 88.15%,平均侧根数为 2.5 根,平均根长为 11.05 cm,根系发育较好。
因此在生产上梅片树扦插宜采用带顶芽茎段的插穗经 100~150 mg/L 的 NAA : IBA=1 : 1 组合或 GGR 浸泡
处理 3 h,选用黄心土基质进行扦插。 相似文献
5.
6.
为解决美国白蜡嫩枝扦插苗生根率低、根系不发达等技术瓶颈问题,以1年生美国白蜡嫩枝为材料,采用单因素随机区组试验设计,研究蚯蚓粪、插穗部位和扦插时间对美国白蜡扦插繁育的影响。结果表明,不同蚯蚓粪配比、插穗部位和扦插时间对美国嫩枝扦插苗生根率、生根数量、最大根长和平均根长的影响差异达到显著水平。以基质3（蚯蚓粪∶蛭石=2∶1）为扦插基质插穗生根率最高,为90.24%;中部位置插穗生根率最优,为89.23%;8月份扦插的效果最好,生根率为91.56%。综上,以基质3为扦插基质,采用美国白蜡1年生枝条的中部位置为插穗,扦插时间为8月份上旬,扦插生根效果最佳,当年苗高达到95 cm左右。 相似文献
7.
青钱柳扦插育苗试验 总被引：1，自引：0，他引：1
以青钱柳硬枝和嫩枝作为扦插材料,分别探讨了基质加温、ABT1和 GGR6应用、基质和空气湿度控制、以及来自不同部位的插条等对扦插生根的影响。结果表明,基质加温可以显著提高青钱柳硬枝扦插生根率,经400 mg/ L ABT1＋400 mg/ L GGR6处理6 h 后,进行基质加温的扦插生根率达35.6％;不同的扦插基质湿度及扦插空气湿度对青钱柳插穗生根率影响显著,青钱柳夏季嫩枝扦插以空气湿度控制在70％左右和 V草炭土： V珍珠岩＝1：1基质、湿度控制在30％左右为佳。青钱柳属难生根树种,从生根率角度考虑,夏季嫩枝扦插选择枝条中上部剪制插穗为佳,硬枝扦插选择枝条基部剪制插穗为宜。 相似文献
8.
2004-2005年在玉溪市林木种苗工作站对羊踯躅进行压条和扦插育苗繁殖,结果为压条繁殖7月中旬、选取2～3年生枝条、环割2／3、喷洒300mg·kg-1ABT6号生根粉,低压生根成活率最高85％,高压生根成活率最高80％;扦插育苗时间最佳为8月中旬,ABT6号生根粉处理浓度200mg·kg-1、最佳基质是60％珍珠岩+40％泥炭土和底层40cm的细河沙,最高生根率为28％。 相似文献
9.
为满足城市绿化需求,加快中华金叶榆繁育速度,开展了嫩枝扦插和嫁接育苗技术研究。结果表明:金叶榆扦插时用100 mg/L的GGR6号生根粉溶液浸泡插穗基部2 h处理的各项指标最优,平均生根率达97.3%,比清水对照高出44.6%,平均根数多出5.24条,平均根长高出3.19 cm,生根指数高出38.29;3月中旬,采用插皮舌接与劈接方法嫁接金叶榆成活率均达90%以上,以插皮舌接嫁接成活率最高,达93.3%。 相似文献
10.
欧洲云杉扦插繁殖技术研究 总被引：3，自引：0，他引：3
为了快速有效地规模化扦插繁殖欧洲云杉,满足造林、绿化用苗的需要。采用全光照自动间歇喷雾装置,用河沙做基质。在林科院甘肃小陇山沙坝的实验基地做了ABT1、NAA、IBA、GGR不同激素,ABT1不同浓度和浸泡时间,5-10 cm、10-15 cm和〉15 cm三种不同插穗长度,5 a和23 a不同采穗母株年龄的嫩枝扦插试验及200 mg.kg^-1ABT1处理1 h的不同插穗类型（嫩枝带硬枝和嫩枝）的试验,用清水处理插穗做对照（CK）。试验数据采用spss12.0进行方差分析,结果表明：不同激素处理的插穗生根率差异显著。生根率大小顺序为：ABT〉GGR〉IBA〉NAA。而IBA处理的插穗生根数,根系总长和根系效果指数均大于其它处理,根系发达。ABT1不同浓度和浸泡时间处理的插穗生根率差异达极显著水平。以100.mg kg^-1和200 mg.kg^-1浸泡30 min和2 h生根率最好。50 mg.kg^-1浸泡1 h处理的插穗生根数、根系总长、根系效果指数大。嫩枝带硬枝和嫩枝生根率差异不显著,但生根数、根系总长和根系效果指数嫩枝带硬枝〉嫩枝。〉15 cm的插穗生根率和其它指标都高。采自23a生母株的插穗没有生根。 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
12.
《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
13.
《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
14.
《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
15.
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
16.
《Scandinavian Journal of Forest Research》2012,27(2):131-138
The effects of soil scarification (mounding), slash removal and clear-cut age on the natural regeneration in clear-cuts was evaluated using data from four sites in southern Sweden. The treatments were carried out during a good seed and establishment year for birch ( Betula pubescens Ehrh. and B. pendula Roth). Scarification had the strongest positive effect on the density of naturally regenerated seedlings, especially in birch, but also in pine ( Pinus sylvestris L.) and spruce [ Picea abies (L.) Karst]. Slash removal had a positive effect on birch density. No statistically significant effect of clear-cut age was found. In addition, no statistically significant interactions between clear-cut age and scarification or slash removal were found. The ingrowth of field vegetation was the fastest in areas that were not scarified, less rapid in areas scarified on old clear-cuts, and the slowest after scarification in fresh clear-cuts. In conclusion, it may be possible to control the density of birch during a good establishment year for birch. If birch is desired, the best combination of treatments is to remove the slash and scarify; otherwise, these treatments should be avoided. 相似文献
17.
18.
《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
19.
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
20.
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