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1994—2001年在福建省邵武市进行马尾松扦插育苗及其造林试验,结果表明:采穗圃剪顶促萌时间以7月25日至8月10日、剪顶高度在8cm为宜,每公顷可产600万根合格的穗条。培育扦插苗可先于12月15日至翌年1月15日在沙床寄插,然后于3月20日至4月10日移植到苗圃培育,平均苗高可达22 6cm,地径0 44cm,当年可出圃造林。用此扦插苗造林,5年生幼林的生长量与生物量均优于对照(实生大田苗造林),各项生长指标差异的趋势基本一致,即扦插苗>容器苗>大田苗。试验表明马尾松扦插苗是可以用于生产性造林的。 相似文献
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[目的]为欧洲云杉扦插穗条选择和扦插苗培育提供依据。[方法]采用完全随机区组试验设计,研究了2种穗条类型(嫩枝基部带1.5年生硬枝、嫩枝)、3种穗条长度(5 10、10 15、15 20 cm)的嫩枝扦插苗从移植当年到第3年的成活率、保存率和生长情况。[结果]2种穗条类型扦插苗间的移植成活率和保存率差异不显著,但移植后嫩枝基部带1.5年生硬枝扦插苗的苗高、新梢生长量、地径、侧枝数、冠幅、鲜质量、干质量差异显著,都是嫩枝基部带1.5年生硬枝扦插苗大于嫩枝扦插苗。3种长度扦插苗的移植成活率、保存率的差异均显著;其中,15 20 cm长度穗条扦插苗移植成活率和保存率最高,分别是98.00%和86.00%,不同长度穗条扦插苗移植成苗率逐年下降,而且与穗条长度有关,弱小穗条获得的扦插苗成苗率低;5 10 cm的扦插苗移植成活率为46.00%,到第3年时保存率仅为23.33%,且移植后苗高、新梢生长量、地径、侧枝数、冠幅、鲜质量、干质量的差异也显著,且都以15 20cm穗条的扦插苗值最高,10 15 cm穗条的扦插苗次之,5 10 cm的扦插苗最小。嫩枝带硬枝扦插苗的苗木质量指数(QI)是嫩枝的7.74倍,15 20 cm穗条的扦插苗质量指数(QI)是5 10、10 15 cm扦插苗的5.47、5.23倍。扦插苗地径初始值与移植当年地径、苗高初始值与移植当年苗高间呈极显著正相关关系。[结论]扦插苗最初的生根状况和穗条质量影响后期培育过程中的存活和生长,嫩枝基部带1.5年生硬枝扦插苗和15 20 cm穗条的扦插苗不仅移植成活率、保存率高,而且生长量、生物量、质量指数都比短而弱小穗条的扦插苗高。 相似文献
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马尾松扦插造林配套技术试验结果表明：选择优良家系建立采穗圃，采取去梢促萌措施，能使采穗母树平均产穗条２０８条／株；地膜覆盖可使扦插苗生根率提高到８９．７６％，比无地膜覆盖提高１３．４７％；采用切根扦插苗造林，其成活率可达９５．３３％；扦插苗造林比实生苗造林的幼林树高增加２９．６２％，地径增加２８．５７％；通过无性系选优的幼林，１．５年生平均树高达１．３３ｍ。 相似文献
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杉木无性系不同规格苗木造林对幼林生长影响的研究 总被引：5，自引：0，他引：5
将１年生杉木无性系扦插苗分为５种规格进行造林试验,研究不同规格苗木对造林成活率和幼林生长量的影响。经８ａ观测表明：苗木生长对造林成活率影响不显著,对幼林生长量则有显著影响。采用苗高３４根径０．６１ｃｍ以上的苗木造林,可显著促进幼林生长,有利于发挥无性系造林的经济和生态效益。 相似文献
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从昭通市引进美国竹柳进行插条扦插育苗、营养袋苗上山造林试验。结果表明,扦插育苗未用药剂处理,成活率达100%。在保证水湿条件,只施一次肥的粗放管理条件下,7个月苗高达1.5~2.5 m,地径1~2 cm。在造林后只铲一次草的粗放管理条件下,裸根苗在洼子地造林的成活率较高,达90%,在干旱坡地造林的成活率低,仅为17%;组培营养袋苗在干旱坡地造林的成活率最低,仅为10%。造林1年后,组培营养袋苗在干旱坡地的年均树高和地径生长量为28.1 cm和0.32 cm;扦插裸根苗在洼子地的年均树高和地径生长量为74 cm和1.7 cm;扦插裸根苗在干旱坡地的年均树高和地径生长量为30 cm和0.4 cm。试验表明:水湿条件或灌溉条件是保证美国竹柳引种成功的关键。 相似文献
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邱进清 《中南林业科技大学学报(自然科学版)》1998,(2)
对杉木无性系扦插繁殖的生根及生长能力与扦插基质、原株年龄、采穗部位、穗条长度、扦插深度和时间等相关因素进行研究,结果表明,在不同杉木无性系之间,扦插生根及生长能力存在极显著差异．扦插基质、原株年龄、采穗部位和穗长、扦插深度和时间,对杉木扦插成活有显著或极显著的影响：①蛭石插床有利于插穗生根,但苗高生长以混合土为基质的插床为好;②无性系的生根能力、苗高和根径的生长量与原株年龄的关系表现为1年生＞3～5年生＞15～20年生;③根径处插穗的生根率、侧根生长量及苗高,分别比苗高1／3处的插穗大11．8％～18．6％,3．4％～9．8％和14．7％～25．7％;④穗长以10～12cm为宜,扦插深度为穗长1／2为好,扦插时间选择在12月份为佳． 相似文献
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A field trial was conducted investigating the single season growth response of 1+0 313 PSB Engelmann spruce (Picea engelmannii Parry ex Engelm.) and lodgepole pine (Pinus contorta Dougl. ex Loud.) seedlings planted into two different soil thermal regimes at three high-elevation locations spanning 200 km in the Engelmann Spruce-Subalpine Fir (ESSF) biogeoclimatic zone in the Cariboo Mountains of central British Columbia. Temperature treatments represented the extremes of soil temperature commonly found in high-elevation clear-cuts. A warm soil treatment (clear day, mid-afternoon soil temperature in mid-summer of 18 to 25 °C at –10 cm) consisting of a bare mineral soil hummock (average dimensions of 100 cm × 100 cm × 40 cm) was contrasted with a cool soil treatment (clear day, mid-afternoon soil temperature in mid-summer of 10 to 13 °C at –10 cm) comprised of organic forest floor overlying mineral soil. By the end of the growing season, seedlings of both species planted into the warm treatment generally exhibited greater root, stem, foliage, and total seedling biomass than cool treatment seedlings. Measurements of root growth at 30, 60, and 90 days after planting showed that total root number and total root length were consistently greater for warm treatment seedlings than for cool treatment seedlings. Root growth was greater from the bottom rather than from the side of the root plug for all seedlings. These results suggest that the effect of low soil temperatures on outplanted styroblock conifer seedlings is pronounced and may be limiting growth performance in high-elevation plantations in British Columbia. We recommend silvicultural treatments that secure natural regeneration, ensure that warmer microsites are always planted, and utilize seedling stocktypes able to make rapid lateral root growth into warmer surface organic horizons. 相似文献
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为了比较华北落叶松初选优良家系的种子萌发特性和苗期生长性状,对8个家系和种子园混合株系、母树林及人工林种子的千粒重、饱满率等表型性状,室内发芽率和圃地发芽率等萌发特性,2a生苗的苗高、地径、生物量等生长性状进行了测量分析,结果表明:华北落叶松家系46、家系75、家系9和家系74的发芽率分别为96.00%、78.00%、90.00%和94.67%,苗高分别为35.6cm、33.0cm、32.8cm和31.4cm,地径分别为5.43mm、6.06mm、5.47mm和5.39mm;这4个家系在发芽指数、苗高和地径方面综合表现好于种子园、母树林和人工林,其隶属函数值为人工林的4倍以上,较母树林和种子园也高出35%以上。 相似文献
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为探索樟子松(Pinus sylvestris var.mongolica)容器育苗的合理容器规格,以白色无纺布袋作为育苗容器,按照育苗容器口径和高度不同,设置6 cm×10 cm、10 cm×10 cm、12 cm×15 cm、15 cm×18 cm 4种容器规格,研究了不同容器规格对樟子松幼苗质量的影响。结果表明:随着容器规格的增大,樟子松幼苗的株高、地径、主根长、植株干鲜质量、根冠比和壮苗指数均呈增加趋势,但12 cm×15 cm和15 cm×18 cm两个规格容器对樟子松幼苗各项指标的影响差异不显著,而樟子松幼苗根系活力、可溶性蛋白和丙二醛均随着容器规格的增大呈先增加后降低趋势,并以12 cm×15 cm效果最佳。研究认为12 cm×15 cm规格的容器更适宜培育樟子松容器苗。 相似文献
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Distribution of ectomycorrhizas and ectomycorrhizal fungal inoculum with soil depth in a birch forest 总被引：2，自引：0，他引：2
The distributions of ectomycorrhizas and ectomycorrhizal fungal inoculum with soil depth (0–45 cm) were determined in a 40-year-oldBetula platyphylla var.japonica forest. Mycorrhizal and non-mycorrhizal fine roots were measured in each soil core sample that was collected at soil depths
of 0–5, 5–10, 10–15, 15–20, 20–25, 30–35, and 40–45 cm. The ectomycorrhizas were mainly distributed (>50%) in the top soil
(0–5 cm) of organic forest floor horizons. Below 5 cm the quantity of ectomycorrhizas decreased sharply. The percentage of
fine roots which were ectomycorrhizal gradually declined with the depth of soil. The ectomycorrhizal fungal inoculum was evaluated
by a bioassay method, measuring the lengths of the entire root system and of the ectomycorrhizal roots of birch seedlings
planted in each soil sample. The soil samples were collected from 0–5, 10–15, 20–25, 30–35, and 40–45 cm depths of the soil
profile. Ectomycorrhizal formation on birch seedling roots in the bioassay was high in both the soil depth intervals 0–5 cm
and 10–15 cm, while the amount was lower in the soil depth interval from 20–45 cm. The results of these investigations show
that the amount of the ectomycorrhizas in soil, and the ectomycorrhizal fungal inoculum potential as determined by bioassay,
are not always consistent with each other. 相似文献
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Where belowground resources are relatively abundant, naturally established trees sometimes occur in very close proximity to
one another. We conducted a two-year study to assess the aboveground interactions between Douglas-fir (Pseudotsuga menziesii), grand fir (Abies grandis) and noble fir (Abies procera) seedlings planted in closely spaced (stems 10 cm apart) conspecific and heterospecific pairs. Paired seedling growth also
was compared to seedlings planted with no neighbor. Stem height growth was not affected by the presence of a neighbor seedling,
although diameter growth was slightly reduced. Branch diameter growth and weight were reduced where seedling crowns overlapped;
branch morphological data suggested that this was caused by shading rather than mechanical interactions. Light measurements
showed the potential for significant shading, particularly by the relatively large, dense crowns of Douglas-fir. Heterospecific
pairs including Douglas-fir demonstrated the competitive production principle in that their mean growth was greater than the
average of conspecific pairs of both species. Neighbor seedling height significantly affected subject seedling growth; neighbor
effects were similar whether the neighbor seedling was growing on the north or south side of the subject seedling. Light reflected
from Douglas-fir crowns had a lower red: far-red ratio than that of noble fir, although there was no evidence of a phytochrome-mediated
growth response to the neighbor seedling. While heterospecific seedling pairs showed reduced competition, we found no evidence
of facilitation for seedlings growing in very close proximity. 相似文献