共查询到10条相似文献，搜索用时 375 毫秒
1.
花榈木不同播种育苗方式效果研究 总被引：6，自引：0，他引：6
试验采用营养袋播种育苗和田间苗床播种育苗2种方式进行花榈木苗木生长量的比较研究,结果表明,2种不同育苗方式的种子的发芽率、高径生长量、根系生长量差异极显著;营养袋有利提高花榈木种子的发芽率及苗木的高径生长和主根生长,但侧根生长较差;为提高移栽成活率,在生产上提倡采用营养袋育苗。 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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利用12个优树自由授粉子代进行容器育苗试验,采用方差、相关、回归等分析方法,对子代容器苗的成苗率、苗高、子叶、上胚轴长度等性状进行分析,探讨了这些性状之间的相关性及育苗方式对生长性状的影响。结果表明:影响成苗率的主要因素是种子的活力,而种子的千粒重大小、播种方式、育苗基质对成苗率无显著影响,但对苗高生长有显著影响;出籽率与球果平均重量无明显相关;子叶片数具有很高的广义遗传力,h2为0 92,且与苗高呈极显著遗传相关。 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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竹柏不同播种育苗方式的生长效果分析 总被引：5，自引：0，他引：5
采用容器(10 cm×10 cm营养钵)和田间苗床2种播种育苗方式,进行了竹柏不同播种密度、不同遮荫处理的比较试验,结果表明:2种育苗方式对竹柏种子的发芽率没有显著影响,田间苗床播种苗的生长量大于容器苗;田间苗床的播种密度以株行距10 cm×20 cm最为适宜,生长量最大;生长期遮荫对竹柏播种苗有极显著影响,遮荫处理的苗木保存率达92.3%,未遮荫的苗木保存率只有37.5%。 相似文献
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通过持续多年对云南石梓进行育苗试验,结果表明,云南石梓种子宜随采随播,不同种子催芽处理发芽率差异极显著,浸晒法＞温水浸种法＞浸沤法＞对照;育苗时间选择4月最佳,幼苗分床以具有1～2对幼叶移植为宜;苗木的生长可分为种子萌发期、扎根蹲苗期、苗木速生期和苗木慢生期,苗高速生期在7～10月,生长量占1年生苗木总生长量的86.8％,地径速生期在8～11月,生长量占1年生苗木总生长量的83.3％,依据各时期苗木生长特点采取相应的管理措施;全苗鲜重最能代表苗木的质量, D＞2.5 cm 、 H＞150 cm为Ⅰ级苗, D＝2.5～1.5 cm 、 H＝150～100 cm为Ⅱ级苗, D＜1.5 cm、 H＜100 cm为Ⅲ级苗。 相似文献
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选择西南桦（ＢｅｔｕｌａａｌｎｏｉｄｅｓＢｕｃｈＨａｍ．）中国分布区内的１３个种源进行苗期对比试验。结果表明：各种源间在种子千粒重、苗木高生长、地径生长、苗木全株生物量方面存在明显的遗传差异;种源内部也存在个体间的遗传差异;经苗期物候观察,各种源除发芽始期遗传差异不明显外,发芽盛期、发芽末期、真叶出现期均存在一定差异。综合苗高、地径、全株生物量等指标,确定云南西畴新马街、西畴莲花塘、腾冲、潞西为苗期生长快、生物量大的种源;云南镇源、屏边、广西田林为苗期生长中等的种源;云南龙陵、景洪、广西平果、凭祥、百色、靖西为苗期生长慢的种源。 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
10.
Abraham Loha Mulualem Tigabu Demel Teketay Kenneth Lundkvist Anders Fries 《New Forests》2006,32(1):71-86
Patterns of genetic variation in Cordia africana, a tropical timber species, were evaluated at the population level. Bulk seed samples were collected from six natural populations
in Ethiopia and examined for variations in seed morphometric traits, seed germination, and seedling growth at nursery stage.
Analysis of variance revealed significant differences among provenances in all studied attributes except root collar diameter
after 4 months of growth. The provenance effect, as determined by broad sense heritability, was 71–98% for seed morphometric
traits, 80% for germination capacity, 42% for germination energy, 57–58% for seedling height and 3–13% for root collar diameter.
Seed weight showed a significant positive correlation with altitude and negative correlation with mean annual temperature
of seed origin. Germination energy was significantly correlated with longitude and mean annual rainfall. Seedling parameters
and geo-climatic variables of seed origin were fairly correlated. A significant intercharacter correlation was found between
seed length and seed weight, between root collar diameter at the age of 4 months and seed length and weight, as well as between
seedling height after 4 and 8 months of growth. It can be concluded that the observed patterns of variation will have implications
for genetic resources conservation and tree improvement. 相似文献