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种子园内单株种子产量的多少,在条件相同的情况,光照强度、光合利用率是决定因素。单位面积种子产量的多少,则决定于单位面积上恰当栽植的株数。两者均涉及营造种子园时定植株行距。如果定植的株行距过稀,今后结实的植株当然少,过密则又影响植株所接受的光照。 相似文献
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1.树苗繁育。选用本地种子进行繁育 ,同时也可挖取本地香椿的支根 ,剪成 15cm长的小段 ,进行扦插繁育。只要苗圃肥沃 ,肥水管理得当 ,均可在年内成苗。2 .篱式定植。在 1m宽的畦床上 ,以 30 cm的株距纵向密植两行 ,两行间的行距亦为 30 cm。畦与畦间的距离为 70～ 80 cm。一般于冬闲时整地作畦并在畦中挖一道深沟 ,施足优质有机肥 ,尔后覆土过冬 ;也可以在春季肥沃的地块上进行。翌春当香椿树苗尚未萌发时 ,按上述株行距定植于施肥沟的两侧。3.幼篱肥培。定植 1～ 2年的幼篱管理重在固培根 ,头年只摘取株位过高的主芽 ,促发低位侧芽 ;第 2年… 相似文献
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我们遵照毛主席关于“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成”的教导,于1974年由省林科所分配进口湿地松种子40斤、火炬松种子8斤,当年春季育苗7.3亩,1975年定植2450亩。1975年省又分配进口湿地松种子12斤,育苗1.8亩,1976年定植600亩。二年来,我场先后集中连片营造国外松3050 相似文献
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道路边坡是一种受人为活动持续干扰的人造生境。因受种子可用性和苛刻立地环境的双重限制,道路边坡植被恢复一直是困扰林业管理者的难题。尽管现有边坡恢复工程技术已相对成熟,但恢复的植物群落通常缺乏自然性和可持续性,其重要原因之一在于既有恢复技术通常忽略群落的形成规律及植物性状在群落构建过程中的潜在作用。植物功能性状分析已成为理解植物群落生态学过程和模式的基本工具,但种子功能性状的重要性在很大程度上仍被忽视,尤其是与种子扩散、沉淀、萌发等群落形成过程密切相关的性状。基于此,为更好理解种子功能性状在边坡植物群落形成过程中的作用,本研究立足于道路边坡生物和非生物环境特征及其生态限制,对既有相关研究进行总结,剖析自然条件下影响植物在道路边坡定植的关键因素,并从种子功能性状角度概述植物种子在扩散、沉淀和萌发等早期群落建立过程中适应边坡环境的生态对策,同时阐述种子功能性状在群落恢复预测以及恢复植物筛选等方面的潜力。总体而言,与种子扩散、沉淀和萌发能力相关的种子性状对植物在道路边坡上成功定植至关重要。演替早期,种源短缺和苛刻非生物环境是影响边坡植物群落建立的主要因素。适应边坡环境的植物,通常在种子扩散、沉淀... 相似文献
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优质甘草人工栽培技术 总被引：1，自引：0，他引：1
文章从种子处理、整地、播种、育苗、移栽定植、田间管理到病虫害防治、采收加工等一系列环节对甘草的栽培技术进行了总结,旨在为发展人工甘草种植提供技术参考。 相似文献
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为解决竹子种子长期保存问题,以马来龙竹、云南龙竹、巨龙竹、金平龙竹、麻竹、长节勒竹、云南箭竹、棉花竹、爪哇巨竹、大泰竹、笻竹、方竹和毛竹13种竹子的成熟种子为材料,通过研究不同低温、低温下不同储存时间、不同含水量、不同发芽设施和不同基质对种子发芽率的影响,来判断竹子种子保存的适合条件。结果表明：1）除笻竹和方竹的种子外,大多数竹种的种子在低温储存5个月内,随着温度由10℃逐渐降低到-16℃,种子发芽率会有不同程度的增高;2）在-16℃条件下,随着储存时间的延长,种子发芽率会有所下降;3）种子含水量会在很大程度上影响种子的发芽率,含水量超过在一定临界值,随着含水量的增加,种子发芽率会显著下降;4）选择不同的种子发芽设施也会影响种子发芽率,生产中宜选用具有微喷灌条件的温室进行育苗;5）在无菌红土、黑土和蛭石这3种基质中,蛭石是竹子播种育苗的适宜基质。 相似文献
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An investigation of seed germination and early seedling growth ofEucalyptus microtheca was based on seed collection from 10 widely separated provenances in Australia. Genetic variation of seed germination and
early seedling growth was observed among a series of provenances whose natural habitats range from different climatic condition.
In the ten provenances, both the model of seed relative germination percentage and the model of seed total germination percentage
fitted Logistic regression [y=a/(1+exp(-ex+b))]. In comparison with provenances from four high temperature (mean annual maximum
temperature >30.0 °C; mean annual minimum temperature >17.0 °C) areas, six low temperature (mean annual maximum temperature
<30.0 °C; mean annual minimum temperature <17.0 °C) areas showed the fast germination rate and the high total germination
percentage. For each provenance we have 45 seedlings equally divided into three watering levels (100%, 50%, and 25% of field
capacity), and studies on relationship between early seedling growth and climatic factors of the natural habitat of provenance.
In control treatment, height growth of the seedling has been associated with intrinsically the driest quarter precipitation
in the seed collection areas of provenance. In all the treatments, length growth of the biggest leaf of the seedling was related
to mean annual maximum temperature and mean annual minimum temperature in origin of provenance. In contrast, basal diameter
growth of the seedling was related to mean annual minimum temperature of the seed collection areas in water stress treatment.
From an ecological viewpoint, the fast germination rate and the high total germination percentage of the seed and rapid early
growth of the seedling appear to be favourable adaptations to the climatic conditions prevailing in the natural habitat of
provenance.
Responsible Editor: Chai Ruihai 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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为获得高效的杜鹃育苗方法,以杜鹃花‘紫鹤’和‘粉鹤’自交种子为试材,研究了不同基质和覆盖处理对杜鹃花种子萌发、成苗和实生苗形态建成的影响。研究结果表明:以未发酵的玉米秸秆粉末作为播种基质不能使杜鹃花种子发芽和形成实生苗;以园土与干苔藓混合物和园土与棉籽壳混合物作为播种基质仅有少量种子发芽,不利于实生苗的生长;以蛭石和蛭石与干苔藓混合物作为播种基质的杜鹃发芽率和成苗率分别可达到65.33%~81.33%和62.67%~78.67%,但不利于杜鹃花实生苗的形态建成;以草炭和草炭与干苔藓的混合物作为播种基质能显著促进杜鹃花种子的萌发和成苗形成,且杜鹃花实生苗生长发育健壮;覆盖处理则降低了杜鹃花种子的发芽率。 相似文献
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不同基质对短序润楠种子发芽及生长节律的影响 总被引：1，自引：0，他引：1
比较分析了河沙、草炭土、园土及三者的混合土对短序润楠种子发芽和幼苗生长的影响。结果表明:不同基质处理下短序润楠种子发芽及生长具有显著差异,混合土和黄心土的发芽率、发芽势和发芽指数等均明显高于河沙和草炭土,但草炭土的叶片展开时的苗高最大。不同基质处理下的短序润楠幼苗的生长特性表明,幼苗早期生长规律符合Logistic曲线特征,其方程拟合模型的决定系数(R~2)均大于0.998,达到显著相关水平。根据Logistic曲线方程上两个生长拐点可以将短序润楠的生长过程划分为渐增期、速生期、缓增期,其中处于速生期幼苗的苗高生长量均超过总量的50%。 相似文献
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In order to determine the influences of environmental factors on seed germination and to identify the effects of germination characteristics on seedling establishment for Sasa veitchii var. hirsuta, germination experiments and a survey on current seedling dynamics were conducted in a natural habitat after mass flowering. The results of the germination experiments revealed that the seeds require a low-temperature environment for germination; those exposed to low-temperature conditions for a time similar to the length of winter (4 months of low-temperature conditions) germinated gradually, while those exposed for longer (>4 months of low-temperature conditions) germinated rapidly. These results were compatible with field observations indicating that seedlings emerged from June to October in the year after mass flowering, and they suggested this germination characteristic (i.e., variation of germination timing due to seed dormancy) may play an ecological function in spreading risk (although it may also increase the potential for seed predation). The results also revealed that stronger light and alternating temperature conditions had no effect on germination, whereas high temperatures and drying had negative effects. The outcomes of the survey on current seedling dynamics revealed that the seedling establishment ratio was high in a forest understory compared to that seen at a site where solar radiation was strong and soil water content was low. This implies that germination characteristics may promote seedling establishment in forest understory. 相似文献
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[目的]通过不同群落毛红椿天然林林地土壤及其真菌对种子萌发和幼苗存活影响的研究,探讨影响毛红椿天然更新的障碍因素。[方法]在江西九连山国家级自然保护区内的3个毛红椿天然优势群落中,分别取距离毛红椿母树3个不同距离(2.5、5.0、7.5 m)处的根区土壤和远离毛红椿母树(25 m以外)的非根区土壤,以非林地土为对照开展室内模拟播种和以根区土壤真菌的水或根系分泌物悬液对毛红椿幼苗进行灌根接种,观察种子萌发、幼苗存活和幼苗感病情况。[结果]各群落土壤中种子发芽均呈先上升后下降规律,且基本在第8 10天达到高峰;林地土与非林地土种子发芽率差异不显著,但林地根区土幼苗的存活率极显著低于非林地土和林地非根区土;距母树3个不同距离根区土的幼苗存活率差异不显著。灌根接种不同处理间幼苗存活率差异极显著,具体表现为接种RS2、RS5根区真菌的幼苗感病率显著高于根系分泌物及无菌水空白对照,且RS2真菌的根系分泌物悬浮液幼苗感病率显著高于其无菌水悬浮液。[结论]毛红椿种子萌发不受土壤环境的影响,但幼苗建成受根区范围内土壤的影响,根系分泌物和致病菌的互作显著降低幼苗保存率。由此推断,毛红椿根区土壤内存在幼苗的潜在致病菌及根系分泌物可增强其致病性。 相似文献
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用定位研究的方法,在丹东不同区域建立生态因子观测场,测定不同土层厚度、pH值、土壤养分含量、空气温湿度、光照强度、降雨、蒸发量等各因子对银杏生长的影响,结果表明:在不同的温度条件下,银杏种子萌发和幼苗生长状况不同,经20 d后,种子发芽率恒温比变温高6.2个百分点,幼苗根系生长、苗高、地径恒温比变温分别提高36.7%和16%。经过遮阴处理,银杏幼苗生长好于对照区。生长在壤土和沙壤土上的银杏其生长表现优于生长在沙土和黏土上的,土壤含盐量以0.03%～0.043%,银杏生长良好。银杏对pH值适应范围很宽,在pH值4～8.5的土壤上均能生长。 相似文献