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1.
在孟加拉Khulna大学森林和木材技术学科苗圃,调查了预处理的苦楝种子的萌发情况。成熟的苦楝种子采自国家植物园内的健康植株,对种子进行了5 种处理(对照,冷水浸泡,热水浸泡,砂纸破皮和浓硫酸浸泡)。结果表明,除了冷水浸泡外,其它播种预处理的种子萌发率显著高于对照种子。砂纸破皮处理的种子萌发率最高(80%),浓硫酸浸泡和热水浸泡的种子萌发率分别是74%和69%。苦楝种子在第8~11天开始萌发,萌发周期是20~21天。方差分析表明,预处理显著影响种子萌发率,但对萌发周期没有显著影响。推荐用热水浸泡处理种植在孟加拉农村的苦楝种子促进萌发。图2表2参30。 相似文献
2.
工业和住宅污泥对大叶相思种子萌发以及幼苗生长参数的影响 总被引:2,自引:0,他引:2
在孟加拉国吉大港大学林业与环境科学院苗圃内,评价了污泥对大叶相思种子萌发以及幼苗生长的作用。播种前,将污泥与营养匮乏的自然林土壤按不同比率混合,分别在播种后的第1,2和3个月时,记录种子萌发情况和幼苗生长参数(枝条和根系的长度、直径、枝条的鲜重和干重、根和总的干物质量)。在播种前和幼苗采收后,分别测定各个处理的污泥-土壤混合物的理化参数(pH值、有机碳、氮、磷、钾),以及重金属含量(铬、镍、锰、镉、锌)。结果表明,与对照相比,污泥-森林土壤混合物中播种的种子萌发率和幼苗生长参数发生显著变化。土壤-污泥按2:1混合时,种子萌发率最高(90%),幼苗生长速率和生物量最大,有机碳和氮磷钾含量也最高。混有工业污泥的土壤中重金属含量要高于混有住宅污泥的土壤。在工业污泥土壤中,污泥-土壤按1:1混合时,重金属含量最高。据此推荐,在退化森林土壤中,土壤-污泥以2:1混合较适合大叶相思种子萌发和幼苗生长。 相似文献
3.
Leucaena leucocephala and Acacia farnesiana are tree species used for several agricultural purposes in the Mediterranean region. The seeds of these species exhibit dormancy,
causing delayed germination. Two experiments were conducted to investigate the effect of pre-sowing treatments (scarification,
hot water, or soaking) on seed germination of L. leucocephala and A. farnesiana. In one experiment, seeds were exposed to three pre-sowing treatments: control, sandpaper scarification, or soaking in 70°C
water for 4, 8, 12, 16, 20, or 24 min. In another experiment, seeds were soaked in 70°C water for 20 min, and then soaked
in water at room temperature for an additional 24, 48, or 72 h or blade scarified. In general, soaking the seeds of the two
species in hot water was more effective in breaking seed dormancy than scarification. Sandpaper scarification was not effective
for either species. Blade scarification increased A. farnesiana seed germination to 56%, indicating that seed dormancy was mainly a consequence of hardseededness.
L. leucocephala seeds collected from Jordan University of Science and Technology (JUST) site and soaked in 70°C water for 20 min and then
soaked for 24, 48, or 72 h had germination rates above 97%. Our results suggest that blade scarification of A. farnesiana seeds and soaking of L. leucocephala seeds in 70°C water for 20 min are effective treatments to break seed dormancy and enhance seed germination of these vital
species. 相似文献
4.
A germination experiment of pre-treated seeds of Melia azedarach was conducted in the nursery of Forestry and Wood Technology Discipline, Khulna University, Bangladesh. Matured seeds of
Melia azedarach were collected from healthy trees of National Botanical Garden, Bangladesh and were treated with five pre-sowing treatments
(control, immersion in cold water, immersion in hot water, scarification with sand paper, and immersion in concentrated H2SO4) on seed germination. Results revealed that the germination rates of pre-sowing treated seeds were significantly increased
compared to those in control, except for cold water treatment. The highest germination success (80%) was found in scarification
with sand paper, followed by 74% and 69% in immersion in H2SO4 and hot water treatment, respectively. Germination started on 8–11 days and completed on 20–21 days of the germination period
in all cases. Analysis of variance showed the significance difference in germination success among the treatments but no significance
difference in germination period among the treatment. Hot water treatment may be recommended on seed germination of the species
in rural Bangladesh. 相似文献
5.
Balbir Singh Rawat Vinod Prasad Khanduri Chandra Mohan Sharma 《林业研究》2008,19(2):125-130
研究赤霉素(GA3),冷湿和温度 对五个种源的印度冷杉(Abies pindrow)和长叶云杉(Picea smithiana)种子萌发的影响.种子被浸泡在GA3 (10 mg(L-1)中24小时,然后在3(5(C温度的条件下冷藏15天.设计4个温度(10(C, 15(C, 20(C 和 25(C)条件来促进种子的萌发.结果表明,浸泡和冷湿处理明显增加种子的萌发率.在10 (C时种子的萌发率最高.总体结果表明,种子被浸泡在GA3 (10 mg(L-1)中24小时,冷湿藏15天,可以有效地促进印度冷杉和长叶云杉的种子萌发.统计数据表明,浸泡处理、温度和种源以及与温度的相互作用都对种子的萌发有明显的影响. 相似文献
6.
在孟加拉西部的Pundibari地区,研究在4个采集(豆荚)时间,3个采集豆荚长度(〈10cm,10-20cm和〉20cm),以及进行的13种预处理对大叶合欢种苗生长和萌发率的影响。豆荚采集时间为2月19日,且没有任何预处理,大叶合欢种子萌发率为92.5%。这明确表明,在2月19日采集的种子具有非休眠,有活力和生理成熟的特性。从长度为10-20 cm豆荚剥离出的种子,2月19日播种,种苗生长良好。利用硫脲预处理种子后,种子的萌发率并没有表现出明显提高,但是当利用低浓度硫脲(100 μL·L-1)预处理种子后,有利于种苗生长。 相似文献
7.
The purpose of this work was to determine the most efficient methods of inoculation to significantly improve nodulation and growth of Acacia senegal and Acacia nilotica, grown under greenhouse conditions. Our results showed that inoculation using dissolved alginate beads containing rhizobia significantly improved the growth of both acacia species better than the growth of plants in other treatments. The experiment with A. nilotica was conducted in two unsterilised soils from different areas. Plants grown in soil from Bel Air were well-nodulated and showed better growth than plants grown in soil from Sangalkam. However, no difference between these soils was shown between the several methods of inoculation and their effect on the nodulation and growth of plants. An interaction between A. senegal and A. nilotica provenances and the effect of inoculation with rhizobia was also demonstrated. Bel Air provenance of A. senegal, Dahra and RIM provenances of A. nilotica grew best of several provenances tested. These results suggest that (1) it may be possible to improve growth and yield of A. senegal and A. nilotica by careful selection of each symbiotic partner; and (2) nursery-grown seedlings of A. senegal and A. nilotica should be inoculated, just after sowing, with dissolved alginate beads containing a mixture of selected rhizobia.
Résumé.
Lobject de notre travail était de déterminer la méthodologie dinoculation la plus efficace pour améliorer significativement la nodulation et la croissance dAcacia senegal et dAcacia nilotica poussant dans des conditions de serre. Nos résultats ont montré que linoculation utilisant des billes dalginate dissoutes améliorait significativement la croissance des deux espèces dAcacia par rapport à celle des plantes des autres traitements. Lexpérience avec A. nilotica a été faite dans deux types de sol non stériles. Nous avons observé que les plants poussant dans le sol de Bel Air étaient plus nodulés et mieux développés que ceux poussant dans le sol de Sangalkam. Cependant, aucune différence significative entre les deux sols na été mise en évidence en termes deffet des différentes méthodologies dinoculation sur la nodulation et la croissance des plantes. Il a aussi été démontré lexistence dune interaction entre les provenances dA. senegal et dA. nilotica et leffet de linoculation avec rhizobium. Cest ainsi que les provenances Bel Air dA. senegal, Dahra et RIM dA. nilotica ont le mieux poussé parmi les différentes provenances testées. Lensemble de ces résultats suggèrent: (1) il devrait être possible daméliorer la croissance et la production dA. senegal et dA. nilotica par une sélection des deux partenaires symbiotiques; (2) Les jeunes plantules dA. senegal et dA. nilotica produites en pépinière devraient être inoculées juste après le semis avec des billes dalginate dissoutes contenant un cocktail de souches sélectionnées. 相似文献
8.
Nursery practice using microbial inoculants was performed to find out the efficacy of the inoculants on seed germination and
seedling growth of sissoo (Dalbergia sissoo Roxb.). Microbial inoculants or effective microorganisms (EM) are a mixture of many different beneficial microorganisms in
a solution. The seedlings were grown in a mixture of sandy soil and cowdung (3:1) kept in polybags with pouring EM solution
at different concentrations (0.1%, 0.5%, 1%, 2%, 5% and 10%) before and after a week of sowing the seeds. Seed germination
rate and growth parameters of seedlings were measured, such as, shoot and root length, vigor index, fresh and dry weight of
shoot and root and total biomass increment. The nodulation status influenced by EM was also observed along with the measurement
of pigment contents in leaves. The highest germination rate (69%) was observed in 2% EM treatment, followed by 67% and 65%
in 1% and 5% EM. The highest shoot length (33.2 cm) was in 2% EM, whereas highest root length (26.3 cm) was in 1% EM. Both
fresh and dry weights from shoot and root, were maximum (4.16 g and 1.57 g; 2.12 g and 0.83 g respectively) in 2% EM and were
significantly (p ≤ 0.05) different from control. Vigor index was highest (4071) in 2% EM, which was significantly (p ≤ 0.05) different from control. Total dry weight increment was highest in 2% EM treatment, followed by 1% and 5% concentrations
of EM. Nodulation number was higher at very low (0.1%) concentration of EM solution but it normally decreased with the increase
of EM concentrations. The contents of chlorophyll a, chlorophyll b and carotenoid were highest (60.11, 17.05 and 42.48 mg·L−1 respectively) in 2% EM treatment and lowest (39.35, 13.55 and 27.29 mg·L−1 respectively) in control treatment. Therefore, low concentration of EM (up to 2%) can be used for getting maximum seed germination
rate and seedling development of Dalbergia sissoo Roxb. 相似文献
9.
For improving seed germination of Prosopis koelziana and Prosopis juliflora, different treatments of seeds were conducted, including scarification with sulfuric acid 98% for 10 and 15 min, sandy paper,
hot water for 5 and 10 min, potasium nitrate 0.1%, gibberellic acid at 250 mg·L−1 and 500 mg·L−1 and combinational treatment of scarification with gibberellic acid of 250 mg·L−1 and 500 mg·L−1. The results show that scarifications with sandy paper and sulfuric acids 98% were the most effective treatments on breaking
seed dormancy and seed germination induction. Scarification with sulfuric acid 98% for 15 min was the best treatment. According
to the positive effect of scarification and lack of reaction of seeds against KNO3 and gibberellic acid, the kind of seed dormancy was determined as exogenous. 相似文献
10.
The germination of common alder (Alnus glutinosa (L.) Gaertn.) and downey birch (Betula pubescens Ehrh.) seeds is often poor in bare-root nurseries. The effect of a variety of seed coverings and a few seed pretreatments
on seedling emergence was examined in this study in an attempt to address this problem. Seeds of each species were sown in
trays containing nursery soil, covered with grit, gravel, sand, combinations of these coverings, a hydromulch or a sealed
plastic cloche and then incubated for 6 weeks at 17–20°C. The grit combined with sand or gravel, the hydromulch and the cloche
increased seedling emergence when compared with the standard grit. In another experiment, seeds of each species were fully
imbibed (FI) (>50% moisture content, MC), as per standard practice, or adjusted to target MC (TMC) (30–35% MC) levels, and
then chilled to release dormancy. Some seeds of each MC treatment were primed at 20°C for 2 days following chilling, after
which all seeds were evaluated in laboratory tests and a nursery trial. Germination potential of the FI seeds declined in
the lab tests by the second test date, which was reflected in low seedling emergence in the nursery in birch. The primed FI
seeds of alder germinated most rapidly in the nursery, but other effects were not significant. Seedling emergence was better
in the nursery in response to the TMC than the FI pretreatment in birch.
相似文献
Conor O’ReillyEmail: |
11.
Improvement in seed and seedling quality of Acacia auriculiformis after culling phenotypically inferior trees was studied
in a 6-year old seed production area (SPA). A 5-ha plantation was identified, of which 2.3 ha was converted into SPA. The
initial stocking, 1 612 trees·ha−1, was thinned down to 982 trees·ha−1 based on growth characteristics. The following fruiting season, seeds were collected from 10 randomly selected trees in culled
and non-culled stands, and seed physical characters, germination and seedling traits were assessed. Seed weight, seed thickness
and percentage germination increased by 32.1%, 4.43% and 22.37%, respectively in the culled stand compared to the non-culled
stand. Culling also increased the speed of germination, seedling dry weight and seedling vigor index. Heritability values
were high for seed weight (0.974) and seed thickness (0.948) while medium values were observed for percentage germination
(0.577) and total dry weight (0.534). Predicted genetic gain was 11.13% and 11.22% for seed weight and percentage germination,
respectively. The actual gain was 32.1, 51.9 and 22.9% for seed weight, percentage germination and total dry matter, respectively.
In conclusion, SPAs established by culling inferior trees could serve as sources of good quality seeds for reforestation programs
until genetically improved seeds are made available. 相似文献
12.
Juniperus procera Endl. is economically important timber species, but its populations are extremely small and fragmented in its natural habitat, thus, calling for immediate ex situ conservation. Here we examined the effects of seed sources and storage temperature on the longevity of Juniperus procera seed lots through collection and preservation of seeds in seed banks. Seeds were collected from nine sites across the species natural distribution in Ethiopia and stored in four warehouses: modern cold room (5℃), mud house (15℃), concrete block house (17℃ or corrugated iron house (20℃) for 42 months. Every three months, a random sample of stored seeds were drawn and tested for germination. A highly significant variation (p < 0.01) in germination of stored seeds was observed among different storage environments, seed lots, and duration of storage. Over the storage period, seeds stored in the cold room had the highest mean percentage germination, followed by the mud house, corrugated house and blocket house. The cold room (41%) and the mud house (38%) maintained the same level of germination as the intitial germination of the seedlotds (42%). The variation in longevity of stored seeds was significnatly correlated with the initial germination of seed lots (r > 0.80; p < 0.01). Cold storage also resulted in enhancement of germination through its stratification effect that terminated the non-deepphysiological dormancy of juniper seeds. In conclusion, seed lots with good initial germination can be effectively stored in cold room (5℃) up to four years. In the absence of modern cold stores, mud houses can be used as a good alternative to store seeds at local level. 相似文献
13.
Realized genetic gains brought by the first-generation tree improvement of Acacia mangium were evaluated by analyzing the 1-year growth performance of growth (height, dbh) and form (stem straightness, multi-stem) traits using data collected from three second-generation orchards: groups B, C, and D. Each orchard was composed of improved families derived from open-pollinated seed of plus trees selected from the first-generation seed orchards and newly added unimproved families collected from the same geographic region. The number of improved families and that of the unimproved in each orchard were 31 and 23 for group B, 28 and 39 for group C, and 24 and 30 for group D. Gains were calculated as percentage increase of improved families over unimproved ones. Improved families performed better than unimproved ones in 11 out of 12 comparison cases: four traits each in the three orchards. Averages of the realized genetic gain across the three seedling seed orchards were 3.1%, 5.2%, 4.3%, and 0.5% for height, dbh, stem straightness, and multi-stem, respectively. Except for multi-stem, the performances of improved families were significantly better than those of unimproved families in all the three orchards for dbh and in two out of three orchards for height and stem straightness. 相似文献
14.
Jiro Otsuka Shutaro Yamaguchi Osamu Chigira Kazutaka Kato 《Journal of Forest Research》2010,15(3):210-216
To determine the viability of hot water emasculation for Acacia auriculiformis, spikes composed of about 100 flowers were soaked in hot water at varying temperatures (45–60°C) and for varying lengths
of time (5 s to 7 min) prior to anthesis. The rate of squashed polyads, each of which consisted of 16 pollen grains, and the
germinating rate on media, decreased with temperature and time. A mating test suggested that the rates of adhering polyads
per stigma and germinating polyads per stigma were lower in the self-pollination of soaked spikes than in that of normal spikes.
On the other hand, the number of matured pods was not significantly different in the mating between the spikes receiving the
soaking treatment (♀) and the spikes receiving no treatment (♂) compared with the mating between normal spikes. Although further
research is needed to determine the optimal treatment conditions, these results suggest that soaking spikes into hot water,
especially at 50°C for 45 s, 54°C for 15 s, and 56°C for 10 s, is an effective emasculation technique. 相似文献
15.
Sadao Takaoka 《Agroforestry Systems》2008,72(3):169-172
This study examined the long-term growth performance of Cordia africana and Grevillea robusta, which are the most common indigenous and exotic trees, respectively, associated with crops in the Mount Kenya region. Local
farmers prefer G. robusta to C. africana as on-farm trees because they believe that G. robusta grows faster. Measurements of height and diameter at breast height were made of 47 C. africana and 89 G. robusta trees for which the age was established based on interviews with farmers. The oldest G. robusta and C. africana trees were 55 and 46 years old, respectively. The apical growth rate for G. robusta was greater than that for C. africana in Katheri (a humid area). The differences between the two species were less remarkable in Ruiri (a dry-subhumid area). There
was no notable difference in the radial growth performance of the two species in Katheri and Ruiri. These comparisons suggest
that the long-term growth performance of C. africana is not necessarily inferior to that of G. robusta. 相似文献
16.
A study was conducted to determine the effects of electrostatic field (ESF) treatment on seed germination and seedling growth
of Sorbus pohuashanesis. The experiments were arranged by uniform design computed by the Data Processing System (DPS), including three levels of
seeds soaking time, four levels of ESF intensity and four levels of ESF treatment time, with 12 treatments. Ten seeds were
used in each treatment with three replicates. Seed vigor, seed germinating ability, emergence rate of seedling, survival rate
of seedling, and seedling height and diameter, as well as the change in activities of superoxide dismutase (SOD), soluble
protein contents, total chlorophyll contents, soluble total sugar contents in leaves of S. pohuashanensis seedlings were measured after ESF treatments. The experiment results show that ESF treatment could improve the water absorption
ability of dry seeds of S. pohuashanensis, resulting in fast germination at room temperature under light conditions. Combined treatment of ESF with cold stratification
could increase seed germination percentage significantly (to 42.20%), promote seedling height growth, affect leaf SOD activity,
and could raise contents of total chlorophyll, soluble protein, and total soluble sugar in leaves. Seed soaking time had a
significant effect on seed relative electroconductivity, seed germination under light, SOD activity, soluble protein content
and total soluble sugar content of seedling leaves. ESF intensity exerted a moderate effect on these indexes. ESF treatment
time only had significant effect on total chlorophyll contents, no evident effect on other indexes. 相似文献
17.
We investigated the morphology and germination of Tamarindus indica seeds in order to discover the effects of variation in seed sources and pre-sowing treatments on germination. The experiment was carried out in the nursery of the Forestry and Wood Technology Discipline, Khulna University, Bangladesh. Seeds were collected from different but healthy trees from various locations in Bangladesh and subjected to four pre-sowing treatments, i.e., control, immersion in cold water (4°C for 24 h), immersion in hot water (80°C for 10 min) and scarification with sand paper. Seed germination was carried out in poly-bags with a mixture of topsoil and cow dung in the ratio of 3:1. The average length of the fresh seeds was 1.35±0.26 cm, their width 1.07 ±0.20 cm and thickness 0.69±0.11 cm. The results revealed that pre-sowing treatments affected the germination process of seeds, which significantly increased the germination percentage with the cold water (81.67%) and scarification with sand paper (82.33%) treatments, compared with those in the control (58.33%) and hot water treatment (59.00%). In all treatments germination started on average within 5 to 7 days after the start of the treatments and were completed from 13 to 19 days later. The greatest success in germination (82.33%) was found in scarification with sand paper, followed with 81.67% in the cold water treatment. The results of analyses of variance (ANOVA) showed significant differences (p<0.05) in germination closing dates, seed germination periods and germination percentages among the treatments but no significant difference among seed sources. However, the effect of the interaction between seed source variation and pre-treatment differed significantly in seed germination closing dates and germination percentages. We recommend cold water treatment (submersion of seed at a temperature of 4°C for a 24-h period) for seed germination of T. indica in rural Bangladesh. 相似文献
18.
Effect of stand age and individual growth on seed germination of <Emphasis Type="Italic">Populus euphratica</Emphasis> in the Ejina Oasis,China 总被引:1,自引:0,他引:1
Amugulang 《中国林学(英文版)》2011,13(3):183-188
We conducted an investigation into the germination of seeds from individual Populus euphratica trees of different ages 相似文献
19.
We conducted a study to find out if arbuscular mycorrhizal (AM) fungi (Acaulospora scrobiculata, Scutellospora calospora) and phosphate solubilizing bacteria (PSB, Paenibacillus polymyxa) inoculation either individually or in combinations can improve Acacia auriculiformis seedling growth, uptake of nutrients and quality in a phosphorus deficient tropical Alfisol. The seedlings were assessed for various growth and nutrient uptake parameters after 60 days of treatment. Inoculation with P. polymyxa stimulated mycorrhizal formation. Seedling height, stem girth, taproot length, number of leaves and leaf area, plant dry matter production, nodulation, and nodular dry weight were significantly higher for seedlings that were either dual inoculated or triple inoculated compared to individual inoculation of AM fungi or PSB, and uninoculated seedlings. Dual and triple application of AM fungi and PSB also significantly improved the nutrient contents of shoots and roots and nutrient uptake efficiencies. The calculated seedling quality indexes of the AM fungi and PSB inoculated seedling were 25–208% higher than uninoculated seedlings. These findings show that A. auriculiformis seedlings when dual inoculated or triple inoculated performed better than seedlings inoculated with the microbes individually and compared with uninoculated control seedlings. We conclude that bioinoculation is important for the production of high-quality A. auriculiformis seedlings in tree nurseries for planting in nutrient deficient soils. 相似文献
20.
We studied the effects of the amount of advanced regeneration before logging and different understory treatments on forest
recovery, particularly the establishment of lucidophyllous (evergreen broadleaved) species, following the logging of conifer
plantation with a focus on the sprouting ability. The establishment of lucidophyllous tree and shrub species originating from
advanced regeneration was closely related to the total amount of these elements in the advanced regeneration, regardless of
understory treatment. The understory-left treatment could preserve understory as surviving individuals by high proportion
(60% or more of the understory) compared with the understory-cleared practice after logging. However, half of the surviving
individuals were damaged to some extent by logging and skidding. Relatively large trees were likely to survive with no damage,
indicating that they face a lower risk than smaller trees. In understory-cleared stands, a high proportion (60% or more) of
the understory regenerated by resprouting. However, the resprouting ratio depended on tree size and species. Therefore, as
well as the amount of the understory, the tree size of understory before logging would be also an important factor for early
forest recovery. Further, the infrequent (low-density) species could easily disappear after logging because of their low resprouting
ratio and low density. Thus, recovery from resprouting alone would risk simplification of the species composition after logging.
We concluded that leaving the developed understory intact before logging can enhance the speed and biodiversity of forest
recovery. 相似文献