共查询到19条相似文献，搜索用时 265 毫秒
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研究了不同类型的污泥(城市的、工业的和住宅污泥)对苗圃生长的银合欢幼苗田间萌发、生长和分枝的影响.播种前先将不同类型污泥的混合物与养分匮乏的自然林土壤混合.播种的3和6月后,记录幼苗大田发芽、分枝状况和其他物理生长参数(枝条或根长、活力指数、茎直径、叶片数、分枝或根鲜重和干重、总的生物量干重增长)等.与对照幼苗相比,混合污泥的土壤中生长的幼苗田间发芽、分枝状况及其他生长参数均发生了显著变化.与其它条件生长的幼苗相比,住宅污泥与土壤混合(1:1)条件生长的3月龄和6月龄幼苗分枝数和分枝鲜或干重均最高.就生长参数而言,住宅污泥与自然林土壤混合(1:1)生长的幼苗长势最好.研究表明:退化的土壤补偿以住宅污泥可促进银合欢的田间发芽、生长以及分枝的形成.图1表3参29. 相似文献
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【目的】研究不同施用量及不同配比的城市污泥和园林废弃物混合堆肥对桑树种子萌发和幼苗生长的影响,探究有利于桑树生长的施用量及配比的混合堆肥最佳组合,为城市污泥和园林废弃物的合理利用提供科学依据。【方法】配制不同施用量(CK、T1、T2、T3、T4,即混合堆肥与土壤体积比为0∶1、1∶3、1∶1、3∶1、1∶0)及4种不同配比(W01、W13、W11、W10,即城市污泥和园林废弃物体积比分别为0∶1、1∶3、1∶1、1∶0)的城市污泥和园林废弃物混合堆肥产品,通过盆栽试验,观察其对桑树种子萌发、幼苗不同时期株高及地上、地下生物量积累的影响。【结果】4种不同配比混合施肥的全部处理均对桑树种子萌发产生抑制作用,在施肥量相同情况下,W10配比对种子萌发抑制作用最强烈;在各配比中,T4处理对桑树种子萌发抑制程度最高;在桑树幼苗生长前期(30～60天),各配比幼苗堆肥产品随施肥量增加均显著抑制桑树幼苗生长,抑制作用随试验时间延长而减弱,在试验后期(120天),一些配比处理转为促进桑树混合生长,幼苗株高最大值出现在W11配比T2处理;除W10配比T4处理外,其余全部处理均不同程度提高桑树地上、地下生物量积累。【结论】城市污泥和园林废弃物混合堆肥产品会对桑树种子萌发产生抑制作用,并显著抑制桑树幼苗前期生长,但随时间延长会促进桑树幼苗生长和生物量积累,其中以W11配比T1处理(施用25%的污泥和园林废弃物体积比1∶1混合堆肥)效果最佳。 相似文献
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用10～1000 mg/L稀土溶液对马占相思和大叶相思浸种24 h后的试验结果表明：适宜浓度的稀土溶液可促进马占相思和大叶相思种子内含物的转化,从而促进种子的萌发和幼苗生长,但同一稀土溶液对不同树种的适宜浸种浓度不同。马占相思以10 mg/L处理有利于提高种子发芽势并缩短发芽时间;大叶相思10～30 mg/L处理显著提高种子发芽率和发芽势,但没有显著缩短发芽时间。200 mg/L及以上浓度浸种对2种树种种子萌发有抑制作用。考虑指标多重比较差异及经济因素,10 mg/L处理较利于马占相思和大叶相思幼苗高和根系生长。 相似文献
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【目的】研究不同浓度重金属铅(Pb^2+)和镉(Cd^2+)对火炬树Rhus typhina种子萌发及幼苗生长的影响,探索火炬树对重金属铅、镉胁迫的耐受程度及机理。【方法】采用培养皿滤纸发芽法,分别用不同浓度Pb^2+(300、600、900、1200、1500 mmol/L)、Cd^2+(140、280、420、560、700 mmol/L)溶液处理火炬树种子,测定种子发芽率、发芽指数、幼苗胚根长和茎长、硫代巴比妥酸(TBARS)含量、可溶性蛋白含量、超氧化物歧化酶(SOD)活性及过氧化物酶(POD)活性。【结果】与对照相比,不同浓度Pb^2+、Cd^2+均对火炬树种子的发芽率、发芽指数和幼苗生长有抑制作用,但低浓度Pb^2+可促进根长和芽长的伸长。随着Pb^2+和Cd^2+溶液浓度的增加,幼苗叶片中SOD活性和可溶性蛋白含量表现为先增加后降低,POD活性和TBARS含量均逐渐升高。其中,Cd^2+浓度为700 mmol/L时,发芽率、发芽指数、芽长和SOD活性达到最低值,而TBARS含量最高;Pb^2+浓度为1500 mmol/L时,根长达到最低值,POD活性达到最高值;Pb^2+浓度为600 mmol/L时,可溶性蛋白含量最高。【结论】Pb^2+浓度为300 mmol/L时会抑制火炬树种子萌发,但会促进幼苗生长,其余浓度Pb^2+、Cd^2+胁迫下,火炬树种子与幼苗受到一定影响,但是均较好完成了萌发与幼苗生长,并表现出多种积极的适应性特征,未出现无根苗现象,火炬树较其他木本植物对铅、镉2种重金属表现出更强的耐性。本试验结果可为今后选用火炬树作为重金属污染土壤的植物修复材料提供理论参考。 相似文献
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《经济林研究》2021,39(2)
【目的】研究催芽、覆盖物对楤木种子萌发和幼苗生长的影响,为六盘山楤木播种繁育和幼苗生长选择合适的催芽方法和覆盖材料提供理论依据。【方法】以六盘山楤木种子为试验材料,采用低温沙藏+高温催芽、室温沙藏+高温催芽、低温冷冻沙藏+高温催芽和低温沙藏4种催芽方法,研究这4种催芽方法下六盘山楤木种子萌发率差异;播种后采用胡麻草、玉米秸秆、落叶松针叶或不覆盖,对比研究4种处理下六盘山楤木种子出苗率、苗高和叶片数差异。【结果】在0℃环境下沙藏150 d后转到25℃环境中继续沙藏30 d,种子萌发率最高,为84.7%,其余依次为处理室温沙藏+高温催芽、低温冷冻沙藏+高温催芽和低温沙藏,三者萌发率分别为72.7%、68.7%和50.0%。覆盖物对楤木幼苗生长的影响采用完全随机区组试验设计,玉米秸秆覆盖的六盘山楤木种子出苗率最高,为74.5%;其余依次为胡麻草、松针和对照,三者出苗率分别为45.6%、43.3%和34.4%。胡麻草覆盖苗高最高,为23.0 cm,其余依次为玉米秸秆、对照和松针,三者苗高分别为13.9、7.1和6.4 cm。胡麻草覆盖的幼苗叶片数最高,为7.7枚·株~(-1),其余依次为玉米秸秆、对照和松针,三者叶片数分别为4.9、4.3和3.7枚·株~(-1)。【结论】六盘山楤木种子萌发以0℃下沙藏150 d后继续在25℃下沙藏30 d为宜,播种后以玉米秸秆覆盖出苗率高,以胡麻草覆盖促进幼苗生长效果好。 相似文献
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遮光度对白木香种子萌发和幼苗生长的影响 总被引：2，自引：1，他引：1
《福建林业科技》2015,(3):110-112
采用遮光网探讨不同遮光度对白木香种子萌发和幼苗生长的影响。结果表明:遮光度75%、50%条件下,白木香种子萌发时间最早,萌发率达到80%以上;自然光(CK)条件下,萌发率最低,萌发时间最迟。不同遮光度对白木香幼苗生长有极显著影响,遮光度75%、50%条件下,白木香幼苗存活率较高,生长较迅速;遮光度90%条件下,白木香幼苗存活率最高,但生长较差;自然光(CK)条件下,白木香幼苗存活率低,生长慢。说明在白木香育苗过程中,适当的遮光能够促进白木香种子的萌发和苗木的生长。 相似文献
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2008年2-4月,在印度西孟加拉邦德赖地区开展了试验,该试验对6个生长基质和3个种子的重量进行了分析,以找出其对梨竹萌发和实生苗生长的影响。与其他基质相比,将50 g的种子种在土壤、沙土和FYM以同一比例混合的基质中,种子萌发较好,实生苗生长更好。 相似文献
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G. M. A. Iqbal S. M. S. Huda M. Sujauddin M. K. Hossain 《林业研究》2007,18(3):226-230
A study was carried out to determine the influence of different types of sludges （municipal, industrial and residential） on field germination, growth and nodulation of L. leucocephala seedlings in the nursery. Before sowing of seeds, different combinations of sludges were incorporated with the nutrient deficient natural forest soils. Field germination, nodulation status and physical growth parameters of seedlings （shoot and root length, vigor index, collar diameter, leaf number, fresh and dry weight of shoot and root and total dry biomass increment） were recorded after three and six months of seed sowing. Field germination, nodulation status and growth parameters were varied significantly in the soil amended with sludges in comparison to control. The highest number of nodule was recorded from soil amended with residential sludge （ 1：1 ） and highest fresh and dry nodule weight was also found from the same combination in both three and six month old seedlings. In case of growth parameters, the highest growth was recorded from soil and residential sludge （ 1：1 ） combination compared to control. From the study, it can be recommended that soil amended with residential sludge （ 1：1 ） provide better field germination, growth and nodule formation of L. leucocephala in degraded soil. 相似文献
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Seed morphology, germination and seedlings growth of Acacia auriculiformis were studied. The experiment was conducted in the nursery of Forestry and Wood Technology Discipline, Khulna University,
Bangladesh. Matured seeds of the species were collected from healthy trees of road side plantation from different areas of
Khulna District, Bangladesh and treated with five pre-sowing treatments (control, immersion in cold water, immersion in hot
water, scarification with sand paper and immersion in concentrated H2SO4). The average length, breadth and thickness were found to be (0.58±0.017) cm, (0.44±0.007) cm and (0.20±0.089) cm, respectively.
Germination was conducted in polybags with a mixture of top soil, coconut husk, coarse sand, and fine sand in a ratio of 3:4:1:1.
Results reveal that pre-sowing treatments influences the germination rates of seeds that significantly increase the percentage
germination compared with those in control (43%) and cold water treatment (52%). The highest germination success rate was
found 83% in hot water treatment followed by 78% in scarification with sand paper, and 75% with immersion in H2SO4. Germination started from 7 to 12 days and completed between 28 and 35 days period in all treatments. ANOVA showed the significant
difference (p<0.05) among the treatments in seed germination, but no significant difference among treatment with regard to starting day,
closing day and total germination period. In case of height and diameter growth, seedlings originated from the seeds with
hot water treatment shows significantly higher in wet season (from May to July). Hot water treatment can be recommended on
seed germination of the species in rural Bangladesh. 相似文献
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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
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A semi-greenhouse study was conducted to understand the effects of soil burial depth on seed germination and seedling development.
The seeds of wild apricot (Prunus armeniaca) were buried at the soil depths of 0-cm, 4-cm, 8-cm, and 12-cm, respectively, to simulate the seed hoarding behavior of rodents
in the field. The results revealed that the rates of seed germination and established seedlings from buried seeds were both
the highest in 4-cm burial depth group, and then decreased with increasing soil depth. The number of rotten seeds increased
in deeper burial depth. It is unfavourable for seed germination at 0-cm burial depth (i.e., seeds were laid on soil surface).
There was insignificant effect of burial depth on growth of established seedlings. The results from this study indicated that
proper burial depth in soil would be helpful for the seed germination and seedling growth. The seedlings derived from buried
seeds at shallower depth (4 cm) in this research have advantage in their early development. 相似文献
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Qi-He Yang Xiao Wei Xian-Lu Zeng Wan-Hui Ye Xiao-Juan Yin Wang Zhang-Ming Yun-Sheng Jiang 《Forest Ecology and Management》2008
Camellia nitidissima Chi (Theaceae) is a famous ornamental species with golden-yellow flowers. Due to deforestation and destructive collection of seedlings, its natural population size has been reduced greatly in recent decades. To provide basic information for its conservation, we studied the morphological and physiological characteristics of seeds and the environmental factors influencing germination. The seed production of C. nitidissima was of low yield, which caused lack of seed resource. The seeds were big and heavy, so they did not spread far from the mother trees and did not enter soil after falling down. Optimal temperatures for seed germination were 25–30 °C. The fresh-harvested seeds had high moisture content and weak desiccation-tolerance, so they tended to be recalcitrant. Soaking for 24 h in 10–30% PEG solution could significantly reduce the seed germination percentage. The imbibed seeds placed on the soil surface mostly could germinate, but some of them could not develop into seedlings because the embryo roots did not grow into soil. When the seeds were sowed at the depth of 1 cm, the seedling emergence reached over 70%, but then decreased with increased sowing depth, and reached about 50% when at the depth of 5 cm. The seeds sowed in sandy soil had higher emergence than those in clayed soil. It is feasible for seedling nursing to harvest seeds in time, harvesting prematurely or postmaturely may reduce seed quality. 相似文献
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Effects of stratification, desiccation, radicle pruning, and season of sowing on Quercus vulcanica germination and growth were studied to identify optimum nursery procedures for artificial regeneration of this species. Following stratification (0, 2, 4 and 8 weeks), acorns were germinated, and acorn moisture content and germination performance were also determined at various times during desiccation. In early December unsprouted acorns were planted in containers, and in early April sprouted acorns, which had been stored in polyethylene bags at 4 °C, with radicles left intact or with radicles pruned back to 1.0 cm were planted in containers.Stratification for 2 and 4 weeks did not increase germination percentage but significantly increased germination rate. Germination percentage of the seeds dropped when the moisture content of the seeds was reduced by desiccation, and the critical minimum moisture content of the recalcitrant Q. vulcanica acorns was found to be 11–16%. Spring sowing of sprouted acorns altered the morphology the containerized seedlings and caused the formation of significantly more main roots, but resulted in significantly less shoot height and shoot dry weight. Spring-sown sprouted acorns had also a significant advantage over the fall-sown unsprouted acorns in seedling survival, and thus nursery personnel should not be concerned if acorns sprout before sowing. 相似文献
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不同处理对凤凰木种子发芽的影响 总被引：6，自引：0，他引：6
凤凰木是世界热带地区著名的园林绿化树种,在我国热带南亚热带地区广为栽培,用常规方法育苗,种子发芽率低、发芽不整齐。为了提高凤凰木种子发芽率,采用沸水浸泡、浓硫酸处理以及砂擦种皮等措施,对种子进行播种前处理、催芽。试验结果表明:3种方法均能显著改善凤凰木种子的发芽状况,但以浓硫酸处理效果最好,其发芽率、发芽势最高,分别比对照高4．9倍和11．7倍,且发芽速度最快,平均发芽速度比对照快3 d;其次是砂擦处理,其发芽率比对照高3．4倍;100℃热水处理的效果较差,其发芽率仅比对照高 1.3倍。 相似文献