共查询到20条相似文献，搜索用时 46 毫秒
1.
[目的]探讨不同种源家系岭南槭种子形态、种子萌发与幼苗生长的特性,分析它们与种源地地理气候因子之间的关系。[方法]对广东省岭南槭天然分布区的3个种源18个家系的种子表型性状、发芽特征、幼苗生长性状和叶色表现进行方差分析和相关性分析。[结果]表明:肇庆黑石顶(HSD)种源的种子最厚、最宽,深圳七娘山(QNS)种源的种子最薄、最窄,惠州南昆山(NKS)种源的种子最长,种子千粒质量最高;翅长与翅宽呈极显著正相关(P0.01),种子千粒质量与发芽率显著正相关(P0.05);岭南槭1年生幼苗地径与苗高成正比,幼苗生长受种源地的地理气候因子影响;在色彩表现方面,QNS3、QNS13家系的明度L*值较大,QNS13色相b*值显著高于其他家系,NKS14家系幼苗的色相a*值最大。[结论]种子千粒质量越高,发芽率越高;幼苗的地径苗高生长受种源地的地理气候因子影响。NKS14家系幼苗红叶特征最明显,色彩表现较好。 相似文献
2.
凤凰木种源与家系种子育苗试验研究 总被引：1，自引：0，他引：1
《热带林业》2017,(2)
2013-2014年进行凤凰木不同种源与家系的种子育苗试验研究,结果表明:不同种源与家系间的千粒重、种子发芽能力与1年生苗木的地径及苗高生长存在较大差异,而冠幅生长差异不明显。经相关分析,凤凰木种源与家系间种子的发芽率与千粒重、平均发芽率分别呈极显著正相关和显著负相关;苗高生长与地径、平均发芽率分别呈较显著正相关和显著负相关。 相似文献
3.
为探明不同家系旱冬瓜种子的发芽能力,通过对9组不同半同胞家系的种子进行实验性测定和发芽试验,对其净度、千粒重、发芽率、发芽势和平均发芽时间进行比较,评价不同家系的旱冬瓜种子储藏后的发芽能力。结果表明:9个家系的旱冬瓜种子的净度、千粒重、发芽率、发芽势和平均发芽时间均存在极显著差异,其中‘思茅2号’种子的净度(88.9%)最高,‘宁洱1号’的千粒重(0.3999 g)最高,‘思茅1号’的发芽率(72.65%)和发芽势(61.00%)最高,‘思茅2号’和‘江城2号’的平均发芽时间(6.5天)最短。综合筛选出‘思茅1号’的半同胞家系为最优。通过低温储藏延长种子生活力,可以灵活调节播种时间。 相似文献
4.
5.
乐东拟单性木兰种源和家系种子苗木培育试验 总被引：3，自引：0，他引：3
乐东拟单性木兰是优良的园林绿化和珍贵用材树种。2006年10月,收集湖南长沙12个和江西7个优良单株（家系）种子进行苗木培育试验。结果表明：乐东拟单性木兰种子千粒重在84．75～187．10g之间,平均千粒重为132．1g,湘10最重。始发天数在18～87d之间,平均始发天数为27d,以湘11最长,赣1、赣3和赣6最短。场圃发芽率在43．6％～75．6％之间,平均场圃发芽率为56．16％,湘2最高,赣5最低,最高家系比最低家系的场圃发芽率高73．4％。出苗期在84～136d之间,平均出苗期为113d,湘11最长,湘8最短,最长家系出苗期比最短的多52d。苗木保存率在69．23％～93．60％之间,平均保存率86．22％,湘7最高,赣4和赣6最低;湘种源家系保存率86％,赣种源家系保存率74．29％。苗高生长家系间及重复间差异均达极显著水平,平均苗木高14．5cm,高生长在10．8～19．5cm之间,以湘7最高,达19．5cm,其次是湘9和湘4,赣种源家系平均苗高为11．2cm,湘种源家系平均苗高比赣种源高36．6％。千粒重与苗高、发芽率及保存率呈负相关。 相似文献
6.
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
7.
研究表明:杉木种子性状间、发芽率与优良度、发芽率与发芽势为极显著相关,而优良度与千粒重为显著相关;千粒重与苗期、幼林的生长性状间的线性相关不显著;同一家系年重复与千粒重之间虽显著线性相关,其它性状相关则不显著;同一家系同年份,苗高、侧枝数有较高的空间重复性,而地径、顶芽数空间的重复性较差;相同家系,树高、胸径和材积生长在不同的地点表现出不同程度的相关系数。树高与胸径生长的相关系数γ值为0.6—0.7;相同家系在不同年份重复中,胸径生长相关显著。 相似文献
8.
乐昌含笑种源与家系种子育苗试验 总被引：3，自引：0，他引：3
2003~2004年对广东、广西、湖南、江西乐昌含笑的14个种源与广东的15个家系种子进行育苗试验,结果表明:乐昌含笑平均种子千粒重143.9 g,乐两16家系千粒重最大,达202 g,千粒重在家系间差异较在种源间差异大。平均始发天数57 d,种源间的差异较家系间差异大。平均播种总天数为155 d,总平均发芽期为100 d,广东乐昌大源种源、乐两12与乐两16家系的平均发芽期在种源、家系中均为最短,家系间播种总天数和平均发芽期总体上比种源间短。场圃平均发芽率为48.05%,种源为24.85%~73.70%,家系为17.93%~88.44%,其中乐两16家系最高,达88.44%,场圃发芽率种源间及家系间的差异均很明显,以家系间的差异尤其明显。1年生苗木平均高48.6 cm,平均地径0.71 cm,广东乐昌九峰种源的苗高和湖南醴陵王仙种源的地径在种源中分居首位,乐两14家系的苗高和乐两4家系的地径在家系中分居第一位。场圃发芽率与种子千粒重、平均发芽期分别呈较显著正相关和极显著负相关,平均发芽期与播种总天数呈极显著正相关,苗高与地径、始发天数分别呈较显著正相关和显著负相关。聚类分析将29个种源与家系分为5类,综合评价以乐大1、乐两16、乐两12、乐两15家系种子质量最优。 相似文献
9.
黄冕林场江南油杉优树子代林测定 总被引：1，自引：0，他引：1
对来自广西、福建的31个江南油杉(Keteleeria fortunei var. cyclolepis)家系进行种子品质测定、育苗和造林试验。结果表明,江南油杉不同家系间种子千粒重、饱满度、发芽率的差异极显著(P 0.01),分别为125.67～196.58 g、37.87%～77.63%、44.14%～88.19%,变异系数分别为20.42%、42.39%、41.39%。31个家系的生长性状差异也达到极显著水平(P 0.01),平均地径为1.68～6.46 cm,变异系数为3.24%～58.71%;平均树高为1.32～4.28 m,变异系数为2.11%～47.40%。3年生子代测定初步结果表明,参试家系可分为4个类型,其中35号为Ⅰ类家系,是表现最优秀的家系,地径和树高分别为群体均值的2.15和2.08倍,平均遗传增益分别为99.05%和97.03%;其次是32号,为Ⅱ类家系,地径和树高分别为群体均值的1.71和1.63倍,平均遗传增益分别为61.37%和56.82%。 相似文献
10.
11.
《Scandinavian Journal of Forest Research》2012,27(5):427-435
In Scandinavia, moose (Alces alces L.) sometimes cause severe browsing damage to economically-important pine. Moose-vehicle accidents have spurred construction of fences along roads, and these may interfere with moose migration between summer and winter ranges, or the road alone may be a barrier. If this happens and moose build up along roads, landowners may suffer economically. Therefore, this study investigated whether roads, fences or other factors influence the use of young pine stands by moose. Eighty stands along roads in northern Sweden were evaluated in which individually-browsed branches were counted on 9972 pines. Moose browsing was not significantly related to birch (Betula pendula Roth, B. pubescens Ehrh.) density, nor did it differ between pines (Pinus contorta Douglas or P. sylvestris L.). However, increased pine density, site productivity and proximity to a highway were associated with increased browsing. Further large-scale studies are needed to understand moose habitat selection and the effects of roads. 相似文献
12.
《Scandinavian Journal of Forest Research》2012,27(3):206-217
The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture regimes. Seedling growth and physiology were evaluated periodically. Seedling survival was reduced when root damage reached levels of 60-80%. Root systems of all three species showed partial to total recovery by the end of the experiment. In general, root freezing damage caused reductions in seedling growth, with these reductions becoming less significant over time. Root damage had little to no effect on black spruce and jack pine seedling physiology, while white spruce CO 2 uptake decreased with increasing root damage. Shoot nitrogen content of all three species decreased slightly with increasing root damage. 相似文献
13.
《Scandinavian Journal of Forest Research》2012,27(1):53-61
This study investigated the stand structure in pine, spruce and deciduous forests in the border district of Finland and Russia. A total of 46 mature forest stands was selected as pairs, the members of each pair being as similar as possible with respect to their forest site type, age, moisture and topography. The stands were then compared between the two countries by means of basal areas and number of stems. The proportions of dominating tree species were 2-12% lower, and correspondingly the proportions of secondary tree species higher, in Russian forests. The density of the forest stock was also higher in each forest type in Russia. The forests in the two countries differed most radically in terms of the abundance of dead trees. The amount was two to four times higher in Russian deciduous and spruce forests, and in pine forests the difference was 10-fold. The stand structures indicated that Russian coniferous stands, in particular, were more heterogeneous than intensively managed pine and spruce stands in Finland. 相似文献
14.
《Scandinavian Journal of Forest Research》2012,27(1):15-27
The root collar diameter and the height:diameter ratio are of particular importance in container-grown seedlings where a high density in the containers may produce spindly seedlings. Temperature regimes and light quality are known to affect plant growth. The aim of this study was to identify responses in Picea abies (L.) Karst. seedlings grown with light providing different red:far-red ratios and under temperature regimes with alternating day (DT) and night temperature (NT) from negative (DT < NT) to positive (DT > NT) difference (DIF) between DT and NT. Experiments were conducted in controlled environment chambers and in a daylight phytotron. Only limited thermoperiodic responses appeared in P . abies seedlings with respect to seedling height and dry weight accumulation. The formation of terminal buds, however, was clearly delayed in seedlings grown at negative DIF. The results indicate a requirement for day extension light that is high in far-red, to prevent terminal bud formation under natural short-day conditions. An extended study should be conducted to clarify the minimum level of light intensity and the optimal light quality needed to prevent terminal bud formation under natural short-day conditions. 相似文献
15.
本文分析了CAD在设计中引起的正面和负面影响,并进行了系统的阐述,从而使设计者在应用中能够保持客观的态度。 相似文献
16.
《Scandinavian Journal of Forest Research》2012,27(2):131-138
The effects of soil scarification (mounding), slash removal and clear-cut age on the natural regeneration in clear-cuts was evaluated using data from four sites in southern Sweden. The treatments were carried out during a good seed and establishment year for birch ( Betula pubescens Ehrh. and B. pendula Roth). Scarification had the strongest positive effect on the density of naturally regenerated seedlings, especially in birch, but also in pine ( Pinus sylvestris L.) and spruce [ Picea abies (L.) Karst]. Slash removal had a positive effect on birch density. No statistically significant effect of clear-cut age was found. In addition, no statistically significant interactions between clear-cut age and scarification or slash removal were found. The ingrowth of field vegetation was the fastest in areas that were not scarified, less rapid in areas scarified on old clear-cuts, and the slowest after scarification in fresh clear-cuts. In conclusion, it may be possible to control the density of birch during a good establishment year for birch. If birch is desired, the best combination of treatments is to remove the slash and scarify; otherwise, these treatments should be avoided. 相似文献
17.
18.
《Scandinavian Journal of Forest Research》2012,27(5):472-479
Based on an enquiry, risk perception among non-industrial private forest owners is described in relation to climate change and forestry hazards. Of the respondents, 11% took action to remedy the effects of climate change. Out of a given set, hazards were ranked according to each respondent's experience of recent substantial financial loss to the estate and in relation to his or her willingness to make investments aimed at risk reduction. For each hazard, the respondent assessed the risk in four classes ranging from very high to negligible risk. Six hazards were considered most problematic in all three aspects: browsing damage, falling timber prices, damage by wind, spruce bark beetle, root rot and pine weevil. A majority of the respondents claimed to take action to reduce the risk associated with at least one hazard, while 35% did not know whether they did. Excluding climate change, the need for decision support was the largest in relation to damage by wind owing to a combination of perceived high risk and a high level of ignorance in relation to whether risk-reducing measures were taken. 相似文献
19.
Srisuda Thippayarugs Banyong Toomsan Patma Vityakon Viriya Limpinuntana Aran Patanothai Georg Cadisch 《Agroforestry Systems》2008,72(2):137-148
In situ produced plant residues contain a mixture of different plant components of varying quality. To assess synergistic
or antagonistic interactions occurring during the decomposition and mineralization of such mixtures, individual plant parts
(stems, leaves, leaf litter and roots) or the mixture of stems, leaves and leaf litter of the agroforestry species pigeonpea
(Cajanus cajan) or of crop residues of peanut (Arachis hypogaea) or of the weed hairy indigo (Indigofera hirsuta) were incubated in pots for 19 weeks. Periodically, remaining plant residues were sieved out (>2 mm), weighed and N content
as well as soil mineral N determined. Above- and below-ground residues of peanut decomposed fastest and showed the largest
N release in agreement with their high N concentration and low-acid detergent fibre (ADF) : N ratio. Hairy indigo was hypothesized
to be of lower quality than pigeonpea because of its high-polyphenol content. However, it decomposed faster than pigeonpea,
largely because of the higher N and lower lignin concentration of its components. Ranking of individual plant components for
N mineralization resulted in the following pattern, leaves > leaf litter > roots > stems. In mixtures of the different plant
components a similar species order in decomposition was obtained, e.g. peanut > hairy indigo > pigeonpea. The amount of N
released from the mixture was dominated by stem material that comprised 46–61% of the mixture. The interactions in mixtures
were relatively small for peanut (generally high-quality components) as well as for pigeonpea (low proportion of high-quality
components, i.e. N rich leaf material). However, a positive interaction occurred during later stages of N mineralization in
the mixture of hairy indigo as it had a significant proportion of N rich components and absence of highly reactive polyphenols.
Thus, for plants with low to intermediate chemical quality attributes, manipulating plant composition (e.g. by varying harvest
age, affecting stem and leaf proportions) will be important to obtain significant interactions during decomposition when its
components are mixed. 相似文献
20.
A. Rigueiro-Rodríguez M. R. Mosquera-Losada E. Gatica-Trabanini 《Agroforestry Systems》2000,48(3):245-256
The use of organic waste materials such as milk sewage as an organic fertilizer could have the dual advantages of organic-waste
disposal and reduced dependence on inorganic fertilizers. The effects of fertilization with (1) conventional mineral fertilization,
(2) milk sewage sludge at 40 kg N ha−1 target rate and (3) no fertilization on pasture production and tree growth were examined in an experiment consisting of two
pasture mixtures under a one-year-old Pinus radiata plantation with a density of 2500 trees ha−1. The two pasture mixtures were: (1) Dactylis glomerata L. var. saborto (25 kg ha−1) + Trifolium repens L. group Ladino (4 kg ha−1) + Trifolium pratense L. var. Marino (1 kg ha−1); (2) Lolium perenne L. var. Tove (25 kg ha−1) + Trifolium repens L. group Ladino (4 kg ha−1) + Trifolium pratense L. var. Marino (1 kg ha−1). The experiment began in the spring of 1995 using a randomized block design with three replicates in Castro Riberas de Lea
(Lugo, Galicia, north-western Spain). Plot size was 12 × 8 m2, with a 1 m buffer strip between plots. Two-year data showed that fertilization with either material had a positive effect
on pasture production, with no significant difference between the two fertilization treatments. Tree growth in the milk sewage
sludge plot was significantly higher than in the control plots. Inorganic fertilization increased pasture production, but
affected tree growth negatively. The results show that milk sewage sludge could be used as a fertilizer in silvo-pastoral
systems.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献