温室容器育苗基质及苗木生长规律的研究

通过对不同育苗基质上生长的香椿、日本落叶松、侧柏、油松等４ 个育苗树种的苗高、地径、地上部分干质量、地下部分干质量、总干质量和地上—地下干质量比等项目进行定期生长监测和统计分析，初步筛选出适宜当地的较为经济的育苗基质；并得出该４个树种容器苗的苗期生长变化规律。     

工厂化容器育苗基质筛选研究

通过用两个代表树种在５ 个不同产地的基质上的育苗试验,采用柱形图直观地分析了苗高、地径、地上部分干重、地下部分干重、总干重等苗木质量指标,选出了适宜培育当地主要造林树种的容器育苗基质,在生产中有推广应用前景。同时也为采用当地泥炭替代进口泥炭寻找到了丰富的资源     

工厂化容器育苗基质筛选研究

通过用两个代表树种在５个不同产地的基质上的育苗试验,采用柱形图直观地分析了苗高、地径、地上部分干重、地下部分干重、总干重等苗木质量指标,选出了适宜培育当地主要造林树种的容器育苗基质,在生产中有推广应用前景。同时也为采用当地泥炭替代进口泥崦寻找到了丰富的资源。     

温室容器育功基质及苗木生长规律的研究

通过对不同育苗基质上生长的香椿,日本落叶松,侧柏,油松等４个育苗树种的苗高、地径、等项目进行定期生长监测和统计分析,初步同适宜当地的较为经济的育苗基质;并得出该４个树种容器苗的苗期生长变化规律。     

珍贵红木树种囊状紫檀容器育苗试验

以培育6月苗龄囊状紫檀容器苗为对象,采用正交试验设计方法开展容器规格、肥料种类和育苗基质对苗木各指标生长的影响研究.结果表明,随着育苗容器规格的增大,苗木的各项指标的生长量明显增多.施5％有机肥的苗高和地下部分的干重明显优于施2％磷肥和1％复合肥,但三者间的地径、主根长、地上部分干重及全株生物量差异不显著.采用80％森林土+20％火烧土的育苗基质培育的容器苗生长表现最好.对不同因素、不同水平的各个组合处理进行分析,6月生囊状紫檀的容器育苗最佳组合为12 cm×16 cm(或9 cm×12 cm)的容器规格,施用2％的磷肥作为基肥,采用80％森林土+20％的火烧土作为育苗基质.     

红花木莲二年生大容器苗的基质试验

红花木莲近年来被开发为生态公益林兼珍贵用材树种.采用播种育苗方法,在大田高密度芽苗移栽,培育成1 a生地栽苗之后,翌年春季采用大容器(25 cm×25 cm)培育成2 a生苗,苗高100 cm左右的大容器苗直接用于造林.对红花木莲2a生容器苗的基质配方进行了比较研究,获得较佳的基质配方,依次为H11号、H12号和H13号.对其地上和地下部分的生长产生明显的促进作用,为开发这个珍稀乡土树种提供了有益的经验.     

不同基质处理对洋紫荆幼苗生长的影响

文章以黄心土为基础,选用泥炭土、椰糠、蘑菇渣3种常用轻基质材料,设置不同比例组成15种基质配方,通过研究不同基质配比处理下洋紫荆Bauhinia variegata的苗高、地径、地上部分干重、地下部分干重、生物量、根冠比、根系生长,评价其育苗效果,确定培养基最优配比。结果表明:不同配方基质对容器苗的生长有显著影响,处理组Z7(黄心土:泥炭土:椰糠=2:1:1)、处理组Z14(黄心土:椰糠=1:4)、处理组Z5(黄心土:椰糠=4:1)的洋紫荆容器苗综合评价值为0.75,0.63和0.55,Z3(椰糠=1)、Z13(黄心土:泥炭土=1:4)、Z6(黄心土:蘑菇渣=4:1)的洋紫荆容器苗综合评价值为0.32,0.39和0.43。综上所述,黄心土:泥炭土:椰糠=2:1:1的基质配比是洋紫荆容器苗最为理想的轻型基质配方。     

不同配比基质对千年桐容器苗生长的影响

为了寻找千年桐（Vernicia montana）容器育苗最佳基质,采用随机区组试验设计,运用方差分析、多重比较等方法,研究不同基质配方对千年桐容器苗生长的影响。结果表明,不同基质配比对千年桐容器苗地径、苗高、地上鲜重、整株干重、地上干重存在极显著影响,对整株鲜重存在显著影响;试验设计的9 种基质中,泥炭100% 加上定量钙镁磷及复合肥、泥炭66%+ 黄心土34% 加上定量钙镁磷及复合肥这两种基质配方的千年桐容器苗地径、苗高、生物量生长最佳,千年桐容器育苗的最佳基质配方为泥炭66%+ 黄心土34% 加上定量钙镁磷及复合肥。     

四翅滨藜容器苗合理出圃高度的研究

通过对容器苗根系生长同地上部分生长关系以及不同高度容器苗造林成活情况的调查研究, 确定四翅滨藜最佳出圃高度为6 ～20cm , 使该树种1 年可连续育苗、出圃造林3 次。     

不同容器规格对薄壳山核桃苗木生长的影响

为探究不同容器规格对薄壳山核桃(Carya illinoinensis)苗木生长的影响,采用不同规格的无纺布容器袋和黑色塑料容器袋培育容器苗,测定苗高、地径、地上鲜重、地下鲜重、地上干重、地下干重、根冠比、根长、根表面积、根体积和根直径等生长指标,筛选出适宜薄壳山核桃苗木生长的容器规格.结果表明,不同容器规格对苗高、地...     

大叶山杨引种育苗试验研究

大叶山杨是吉林市林科所从长白山地区的山杨种群中选育出来的优良变种，该树种上具有生长迅速、成材早、耐寒、耐瘠簿、适宜地山地生长等优良特性。阜新地区为了丰富山地造要的树种资源，进行了引种育苗试验。结果表明，１年生播种苗和２年生移植苗均表现出原产地原种的优良特性，１年生苗高和地径分别比省标高出８０％和５３％，苗木合格率达９４％；１年生苗总干重大于标准４０．３％，根茎的干重比达１．５６，比一般苗木高出４２     

The effect of seaweed concentrate on the growth of Pinus pinea seedlings

Seedlings of Pinus pinea L. growing in plastic containers were treated with seaweed concentrate (SWC). Different concentrations of SWC were applied, 0 to 3 times, to the roots or shoots of the seedlings. Shoot application increased plant weight mainly by increasing shoot growth. This was manifested as increased shoot length and weight and a decrease in the root/shoot ratio. Root drenches did not change the total plant weight but it accelerated root growth and increased lateral root dry weight. Root growth capacity (RGC) tests for both shoot and root applications indicated an increase in root length and some increases in root number when applied as a root drench. This study indicates that root application of SWC improved seedling quality and increased the ability of seedlings to survive transplanting into pots.Abbreviations GC-MS Gas Chromatography-Mass Spectrometry - RGC root growth capacity - SWC seaweed concentrate     

Comparison of container-grown Pinus taeda L. seedlings raised outdoors and in a growth chamber in sunlight

Two annual crops of container-grown loblolly pine (Pinus taeda L.) seedlings raised outdoors differed from those grown inside a covered chamber with a clear top. After a 90-day growth period, outside-grown container seedlings had shorter heights, smaller root collar diameters, and lower root, stem, foliage, shoot, and total dry weights than chamber-grown seedlings. Fall-planted, outside-grown seedlings raised the first year had up to 10% higher field survival than those from the chamber. However, chamber-grown container seedlings that survived retained their initial height and diameter advantages following one complete growing season. Fall-planted seedlings raised the second year showed no differences due to growth treatments when favorable weather for seedling growth occurred after field-planting. Container-grown seedlings raised outdoors during the summer months are well suited for fall-outplanting.     

模拟酸雨对广西4个树种苗木生长的影响研究

采用盆栽试验,设置4个水平(pH3.0、pH4.0、pH5.0、pH5.6)、一个对照(pH6.0),共5种处理,测定4个树种在不同pH值酸雨处理下其苗高、地径和生物量变化情况,分析不同pH值及处理方式的酸雨对广西地区速生及珍贵树种幼苗生长的影响。研究结果表明,随酸雨pH值的降低,4个树种的苗高相对生长量和地径相对生长量总体均呈下降趋势;巨尾桉9号在模拟酸雨pH3.0时,其地上生物量显著大于对照,在pH5.0时,其地下生物量、总生物量略大于对照,在pH5.6时,其根冠比最大;格木在模拟酸雨pH5.6时,其苗高相对生长量显著大于对照,根冠较对照大;降香黄檀在模拟酸雨pH5.0时,其苗高相对生长量显著高于对照,根冠比最大;在不同浓度酸雨处理下,土沉香各生长指标均显著小于对照。     

切根对马尾松苗木及造林初期生长的影响

为提高马尾松苗木质量和造林质量,本文分析了切根对马尾松苗木及造林初期的生长特征。结果表明:切根对马尾松苗木及造林初期生长具有显著的影响。马尾松切根苗苗高、主根长不如对照组,但地径、侧根数、侧根长显著优于未切根苗,径高比的改善提高了苗木质量,有利于提高马尾松造林保存率。造林3年后,切根苗木高生长与未切根苗木相当。     

N素指数施肥对格木、降香黄檀苗期生长的影响

用氮素指数施肥法对格木（Erythrophleum fordii）、降香黄檀（Dalbergia odorifera）幼苗进行不同施氮量处理,结果表明,随着施氮量的增大,格木幼苗的苗高、地径以及根、茎、叶生物量和总生物量总体均呈先增后降的趋势;降香黄檀幼苗的苗高、茎生物量呈先增后降的趋势,地径及根、叶生物量和总生物量总体呈上升的趋势。根冠比随施氮量的增加而降低。综合分析苗高、地径和生物量3 个性状,确定格木、降香黄檀苗期的最佳总施N 量分别是1 000、5 000 mg/ 株。     

南方红豆杉苗木性状种源分化和育苗环境对苗木生长的影响

利用来自10个省区27个产地的南方红豆杉种子在福建明溪和浙江淳安2个地点开展种源苗期遗传测定,系统研究苗木生长、苗高生长参数、根系特征和干物质积累等性状的种源差异及育苗环境对种源苗木生长的影响.研究结果显示:南方红豆杉苗高、地径和侧枝数存在显著的种源差异.基于苗高生长参数分析表明:种源苗高的增加主要是由于线性生长量、最高生长速率和线性生长速率的提高,而不是由于线性生长期的延长.相对于其它树种,南方红豆杉线性生长速率虽较小,但线性生长期较长.试验虽然未发现根系形态、干物质积累量的种源差异达到统计学上的显著水平,但这些性状的种源绝对值却相差较大,达20%以上.育苗环境对南方红豆杉种源生长影响较大,良好的水热资源和庇荫条件将显著促进苗木的高、径生长.苗木生长性状存在显著的种源与地点互作,但种源与遮阳处理的互作却很小.不同育苗地点南方红豆杉苗高和地径呈现出的地理变异模式是不同的:在福建明溪点,种源苗木高、径生长与产地的地理气候因子相关性较小,苗期速生种源不仅有来自自然分布区偏东部和偏北部的种源,而且还有来自偏南部和偏西部的种源;在浙江淳安点,来自偏东部和偏北部的种源苗高生长量较大,而来自偏南部和偏西部的种源生长则较慢,类似于作者对南方红豆杉有限分布区种源试验的已有研究结果.     

Morphological and physiological responses of beech (Fagus sylvatica) seedlings to grass-induced below ground competition

We examined morphological and physiological responses of beech (Fagus sylvatica L.) seedlings to grass-induced below ground competition in full-light conditions. Two-year-old beech seedlings were grown during two growing seasons in 160-l containers in bare soil or with a mixture of five grass species widely represented in semi-natural meadows of central France. At the end of the second growing season, beech seedlings in the presence of grass showed significant reductions in diameter and height growth, annual shoot elongation, and stem, root and leaf biomass, but an increase in root to shoot biomass ratio. Grasses greatly reduced soil water availability, which was positively correlated with daily seedling diameter increment. Beech seedlings seemed to respond to water deficit by anticipating stomatal closure. There was evidence of competition for nitrogen (N) by grasses, but its effect on seedling development could not be separated from that of competition for water. By labeling the plants with 15N, we showed that beech seedlings absorbed little N when grasses were present, whereas grasses took up more than 97% of the total N absorbed in the container. We conclude that, even if beech seedlings display morphological and physiological adaptation to below ground competition, their development in full-light conditions may be strongly restricted by competition from grass species.     

Container volume and subirrigation schedule influence Quercus variabilis seedling growth and nutrient status in the nursery and field

Container volume and irrigation management affect seedling growth in the nursery and field. We evaluated the effects of container volumes (D40, 656?ml; D60, 983?ml) and subirrigation schedules (85%, 75%, 65%, and 55% of 100% total substrate moisture content, TSMC) on seedling growth in a greenhouse and outplanting performance of Chinese cork oak (Quercus variabilis Blume) for one growing season. In the greenhouse, morphological attributes of seedlings grown at 85% and 75% TSMC in D60 were greater than those grown at 65% and 55% TSMC in D40. After outplanting, seedlings grown at 75% TSMC in D60 were tallest but not different than those grown at 65% TSMC. Shoot (9.2?g), root (28.0?g), and total (37.2?g) biomass of seedlings subirrigated at 55% TSMC in D60 reached maximum values, but shoot biomass for seedlings grown at either 65% or 55% TSMC was similar. Root and total N and K contents of seedlings subirrigated at 65% and 55% TSMC were greater than those grown at 85% and 75% TSMC. Our results suggest that reducing the subirrigation schedule threshold and using a container with more volume could improve oak seedling growth and nutrient accumulation during the first growing season of outplanting.