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基于2015年及2020年连江县的重点保护野生木本植物资源调查,共调查到重点保护野生木本植物18种,隶属12科16属,其中国家一级重点保护野生植物1种,国家二级重点保护野生植物6种,省重点保护野生植物6种,极小种群有2种,地方和国家特有种3种;记录到重点保护野生植物84株1丛,分布乡镇共18个,占连江县乡镇总和的82%。分析连江县重点保护野生植物资源及分布现状,可为县域野生植物资源保护提供理论依据和数据支撑,以加强濒危野生珍稀植物的保护,保障物种原生和种群分布的和谐稳定共存,逐步繁衍壮大栖息地。 相似文献
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《浙江林业科技》2017,(5)
2008-2016年,对贵州省8个自然保护区进行了科学考察,对多个县市的林木种质资源进行调查研究,野外采用线路调查,室内结合所拍摄照片及资料分析,对野生奇异观果植物资源进行了研究。结果表明,贵州野生奇异观果植物有27科46属106种,其中常绿木本植物53种,落叶木本植物46种,草本植物7种;种类较多的科为槭树科Aceraceae(17种)和椴树科Tiliaceae(12种);种类最多的属为槭属Acer(16种);蒴果类38种,翅果类23种,蓇葖果类13种,核果类12种,坚果类11种,这5种果实类型植物占奇异观果植物总种数的91.51%。野生奇异观果植物可用于行道树、庭园树、花灌木、孤植树、垂直绿化、盆栽观赏、边坡绿化和棚架绿化等。 相似文献
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浙江产国家重点保护野生植物(第一批) 的分布与保护现状 总被引：16，自引：3，他引：16
1999年8月4日国家林业局和农业部发布了国家重点保护野生植物（第一批）名录，对产于浙江的11种一级保护植物和40种二级保护植物在浙江省的分布，保护和研究现状调查表明，浙西南部是浙江产国家重点保护野生植物的分布中心，分布有百山祖冷杉，九龙山榧二个浙江特有种，浙西北部是其又一分布中心，分布有天目铁牛，羊角槭二个浙江物有种，大部分保护植物分布于百山祖，凤阳山，九龙山，乌岩岭，天目山，清凉峰，九王山等自然保护区内。浙东地区种类相对较少，但有天台鹅耳枥、普陀鹅耳枥、普陀樟三个浙江特有种。浙江产国家重点保护野植物集中分布在海拔250－1250m，最高限海拔为1700m， 珍稀濒危植物的保护与繁殖等方面做了大量的工作，取得了丰硕成果，并就开展和加 强资源保护工作提出几点建议。 相似文献
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以采自蒙山的蒙山鹅耳枥和鹅耳枥各5株为试材,进行核糖体DNA(nrDNA)内转录间隔区(ITS)序列检测,并将ITS序列导入NCBI数据库比对,分析蒙山鹅耳枥和鹅耳枥亲缘关系。结果显示:1)蒙山鹅耳枥和鹅耳枥ITS序列高度相似,601个碱基序列中只有1个碱基差别。2)蒙山鹅耳枥ITS序列与NCBI数据库中Carpinus sp.Wen 9187(编号EJ011711729.1)序列相似度为100%,与同属近缘种鹅耳枥序列相似度为99%。结论:1)蒙山鹅耳枥是独立物种。2)蒙山鹅耳枥不再属于山东特有物种,分布区除蒙山外韩国也可见其分布。 相似文献
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河南鸡公山自然保护区野生保护植物优先保护定量分析 总被引：1，自引：0，他引：1
运用濒危系数、遗传价值系数和物种价值系数,对鸡公山自然保护区重点保护的37种野生植物的优先保护顺序进行定量分析。结果表明：最优先保护的有野八角、细茎石斛、天目木姜子和扇叶杓兰4种,占总数的10．81％;优先保护的有独花兰、天麻、天竺桂、楠木、莲、黑节草、三尖杉、中国粗榧、豹皮樟、青钱柳、河南山胡椒和河南鹅耳枥12种,占总数的32．43％;次优先保护的有香果树、榉树、黄檗、青檀、野菱、大果榉、黑壳楠、刺揪、铜钱树、珂楠树、暖木、玉铃花和万年青13种,占总数的35．14％;一般保护的有金荞麦、中华结缕草、野大豆、枫香、重齿槭、绞股蓝、飞蛾械和独根草8种,占总数的21．62％。提出进一步加强国家重点保护野生植物的保护对策。 相似文献
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对槲栎(Quercus aliena)、白栎(Q．fabri)、青岗栎(Cyclobatanopsis glauca)、小叶青岗(C．myrisinalefolia)、云山青岗(C．Nubium)、青皮青冈(C.gilva)、云贵鹅耳枥(Carpinus pubescens)、云南松(Pinus yunnanensis)等进行了块菌的感染接种试验，块菌的接种成功率除云南松略低(80％)，其它的均很高，达90％以上。接种成功的关键在于介质的配比及消毒杀菌；而块菌林能否形成块菌子实体的关键是栽植地的选择及土壤改良，土壤的pH值要求在7．6以上；在块菌林的生长过程中对土壤养分进行动态监测，了解菌根菌的变化。 相似文献
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为筛选适宜的乡土植物在四川境内开展镉污染土壤修复,选择4种乡土木本植物(云南松Pinus yunnanensis、桤木Alnus cremastogyne、红椿Toona ciliata、五小叶槭Acer pentaphyllum)的种子,分别设置不同浓度梯度,研究重金属Cd胁迫对植物种子萌发及幼苗生长的影响。结果表明,就发芽率而言,镉对云南松的萌发没有明显影响,对桤木种子的萌发具有抑制作用,对红椿和五小叶槭的萌发具有一定的促进作用。就幼苗生长而言,镉处理对云南松的苗长和根长均具有促进作用;对桤木和五小叶槭总体表现为促进苗长,抑制根长;对红椿表现为抑制苗长,促进根长。耐受性综合评价结果显示,这4种植物镉耐受性强弱为红椿云南松五小叶槭桤木。 相似文献
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为探寻不同光照强度下欧洲鹅耳枥Carpinus betulus及其不同园艺品种(种)Carpinus betulus‘Beekman’、Carpinus betulus‘Frans Fontaine’、Carpinus betulus‘Lucas’的叶色及其生理变化,筛选适宜的光照强度及变色效果更好、观赏价值更高的品种,以4个欧洲鹅耳枥品种(种)为试验材料,通过不同梯度的遮阴处理,营造不同的光照强度,而后对其叶片进行叶色及生理指标的动态观测,并进行方差与相关性分析。结果表明:各欧洲鹅耳枥叶色转变的根本原因均是类胡萝卜素与叶绿素比值的升高,表现为类胡萝卜素较叶绿素稳定,分解较慢,导致类胡萝卜素在色素中的比例占优,进而叶色转黄。相关性分析显示,叶绿素总量、类胡萝卜素、花色素苷、可溶性糖、可溶性淀粉、可溶性蛋白之间呈极显著的线性相关(P0.01),其中可溶性蛋白与其他指标为极显著负相关。结论:4个欧洲鹅耳枥品种(种)变色期存在差异,在全光照条件下有最佳的叶色表达效果,在南京地区Carpinus betulus、Carpinus betulus‘Beekman’、Carpinus betulus‘Frans Fontaine’作为园林秋叶树种有较长观赏期,类胡萝卜素是其呈色基础,叶色变换会影响可溶性糖、淀粉、蛋白质的积累。 相似文献
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《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
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《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
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《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
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《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
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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
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《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
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《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
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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
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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