共查询到19条相似文献，搜索用时 171 毫秒
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红松播种种子不同处理方法效果的研究 总被引：2，自引：2，他引：0
通过对红松种子进行3种不同方法的处理,在播种后,调查和分析不同处理方法对苗木生长情况的影响.结果表明,不同处理方法对苗木的发芽时间、出苗时间及出苗率影响较大;对苗木的高、径等性状指标的影响较大.3种方法中最好的是越冬埋藏法,其平均苗高4.4 cm,平均地径2.49 mm,生物量全干质量31.14 g. 相似文献
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研究了不同处理方式对油茶出苗率和苗木生长的影响,结果表明:采用沙床催芽方式育苗的油茶种子出苗率高于直接播种,不同育苗方式的出苗率均在第30天时达到高峰;油茶1年生苗木的苗高生长过程方程为y=97.704/(1+18.161e-0.041x);地径生长过程方程为y=1.244/(1+6.186e-0.024x);移苗后不同种植密度对油茶苗木的生长和苗木质量有重要的影响,随着密度的降低,各处理苗木的苗高、地径及单株生物量等均呈逐渐增大的趋势,密度为36株/m2的油茶苗木生长较差,密度为16株/m2的油茶苗木生长较好,其干物质积累量也较高。研究结果对油茶优质壮苗培育具有一定的参考价值。 相似文献
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通过对红松种子雪藏和沙藏、红松留床苗覆锯沫子和草碳土等不同处理方法对红松苗木生长影响的研究，表明种子的沙藏和雪藏对苗木的高生长和径生长都有显著影响。 相似文献
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气温升高对枸杞苗木生长的影响 总被引：1，自引：0，他引：1
通过对枸杞幼苗生长指标和生理指标的测定，探讨增温处理对枸杞苗木生长的影响。结果表明：在生长前期，苗木的新梢长和新梢粗都表现为增温处理时增长幅度较大，但后期受到抑制，新梢长的表现较为明显；处理结束后，测定苗木的单叶面积、生物量和叶绿素含量，结果均表现为增温处理低于对照处理，其中单叶面积的差异较为显著。由此可知，增温过高对枸杞苗木的生长有抑制作用。 相似文献
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杉木是遂昌县造林的主栽树种，由于山区冬季气温变化大，长期以来每年的杉木幼苗冻害率达10％左右，最严重达28．4％，而且受冻害的都是优质苗。为此，我们于1989年开展了采用化学药物促进苗木提早木质化，防止冻害的试验研究，并取得了显著效果。同时为了了解化学药物使用后是否对造林当年幼林生长有影响，选择1991年秋天分别经各类药物处理，并露天越冬充分木质化的苗木，于1992年进行了造林对比试验。1苗木防冻试验化学药物防冻试验，分别采用氯化钾、磷酸二氢钾、硼砂三种药物处理，外加对照。于1989年9月26日第一次喷药，初施浓度为氯… 相似文献
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经５年试验表明，厚朴苗木地得８ｍｍ以上时，其苗高对幼林生长无显著影响，苗木过高（９０Ｃｍ以上）特降低造林成活率；厚朴幼林施化学氮磷基肥，只对初期生长有促进作用，但与寸照相比差弄不显著，３年后差异完全消失． 相似文献
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九种珍稀树种育苗技术及苗期生长 总被引：2，自引：0，他引：2
对伯乐树、乐东拟单性木兰、红豆树、浙江楠、浙江水青冈、巴山水青冈、秃叶黄皮树、细柄蕈树和华西枫杨９种珍稀树种进行播种育苗试验，结果表明，用适宜的种子预处理、贮藏、播种和圃地管理等技术，能使这些难繁殖的树种都有一定的出苗率，最高的达９８．８％（伯乐树），最低的也有１．３２％（华西枫杨），至生长结束时，按树种计，苗木平均高度为７．２～４２ｃｍ，秃叶黄皮树年生长量最高达５４ｃｍ。同时，还报导了各树种苗木逐月的高生长和生长高峰期。 相似文献
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刺龙牙种子层积处理及播种育苗密度研究 总被引：1，自引：0，他引：1
在辽东山区开展了刺龙牙种子不同层积处理时间对种子发芽和出苗的影响,以及播种苗不同保留密度对苗木生长影响。结果表明,层积处理能有效提高刺龙牙种子的发芽率和出苗率,处理时间达到125 d时,达到显著水平,发芽率达到61.43%,出苗率达到50.28%,出苗快而整齐;1年生幼苗保留密度85株/m2的Ⅰ、Ⅱ级苗产量最高,生长均匀整齐。 相似文献
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通过不同处理措施的苗床育苗和营养钵育苗观测试验,研究了花楸播种繁殖的出苗和生长情况。结果表明:(1)利用营养钵播种育苗,播种深度4 cm,出苗率最高,可达到90%,当年保存率为75%,大大高于土壤作床播种出苗率,(2)从生长量来看,用腐殖土、河沙及松针作为基质,苗床播种深度为5 cm的播种方式,出苗后1a内生长最高可达44.5 cm,最低11.5 cm,整体平均生长高度为29.3 cm,生长量较其它播种方式优势明显,(3)在高山峡谷地区进行花楸育苗,幼苗期间主要病虫害为立枯病和红蜘蛛,通过科学施用多菌灵和敌杀死,可有效控制。 相似文献
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柳厚壁叶蜂生物学特性及其防治研究 总被引：1，自引：0，他引：1
柳厚壁叶蜂是一种严重危害柳树的害虫,在北方地区普遍发生,直接影响柳树的正常生长发育。通过对其生物学特性的研究,掌握其发生发展规律,抓住羽化高峰期和虫瘿刚刚形成时期进行药剂防治,从而达到一定防治效果,以保护多年来的绿化成果。 相似文献
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采用Logistic曲线经验式拟合橄榄竹的出笋规律,并对不同时期、立竹年龄、土层的出笋、退笋、成竹情况进行调查分析。研究结果表明：出笋量日进程符合Logistic曲线的“慢一快一慢”规律。由此其出笋期可划分为3个时期。研究结果也表明：不同时期、不同立竹年龄、不同土层的出笋、退笋、成竹存在明显差异。橄榄竹适宜留笋的时期为出笋中期。适宜留笋养竹的立竹年龄以1、2年生为好。橄榄竹不同竹龄发笋能力,与毛竹差别甚大。橄榄竹发笋早,1年生竹连着的鞭可孕笋成竹,竹寿命较短。这就要求在经营管理上要有别于毛竹。橄榄竹适宜留笋养竹的土层深度16～30cm。本研究为橄榄竹制定留笋养竹保育技术提供了可借鉴的理论依据。 相似文献
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We compared light acclimation potential among three evergreen broadleaved species with contrasting patterns of shoot elongation, leaf emergence and leaf maturation. Understory saplings were transferred to a high-light environment before bud break, grown for 13 months, and then transferred back to the understory to observe subsequent carry-over effects. Acclimation potential was highest and sapling mortality was lowest for Cinnamomum japonicum Sieb. ex Nakai. Indeterminate growth and successive leaf emergence allowed this species to acclimate to both high and low light by adjusting leaf production as well as leaf properties. Sapling mortality occurred after both transfers for Camellia japonica L., which also has indeterminate growth and successive leaf emergence. In this species, carry-over effects were observed at the individual level, but leaf-level acclimation potential was high. Acclimation potential was lowest and sapling mortality occurred soon after the transfer to high light for Quercus glauca Thunb. ex Murray. Determinate growth and flush-type leaf emergence resulted in significant carry-over effects in this species. Indeterminate growth and successive leaf emergence increase whole-plant acclimation potential by extending the period of growth and architectural development during the growing season. Similarly, we inferred that delayed leaf maturation, observed in many evergreen species, increases the acclimation potential of current-year leaves by extending the period of leaf development. In evergreen species, the acclimation potential of preexisting leaves determines the role that leaf turnover plays in whole-plant light acclimation, resulting in diverse strategies for light acclimation among species, as observed in this study. 相似文献
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Although previous studies have shown stand thinning increasesoak wood quality defects due to epicormic branch development,thinning failed in experiments at three different sites to stimulateepicormic bud emergence or later growth in either the first,second or third years. This was in spite of much higher irradiancesbeneath the thinned canopies, which transmitted 73 percent morelight than the unthinned stand during the summer months. Irradiancesbeneath the thinned stands were increased by only 13 percentin the period during the spring when the epicormic shoots emergedfrom the bole of the trees, preceding expansion of the leafcanopy. When, using artificial shading, the intensity of lightincident on the bole of trees in a thinned stand was reducedby 80 percent, without affecting bark tempertures, the numbersof epicormic shoots which emerged was similar to that on unshadedtrees. Epicormic shoot emergence from the boles of thinned treeswas completely prevented by excluding light from the bole withaluminium foil, which also reduced bark temperatures. When thefoil was substituted by black polythene, which raised bark temperatures,the inhibition of epicormic shoot emergence was only 88 percent. These results indicate that epicormic shoot emergence is notstimulated by increased exposure of the epicormic buds to lightin thinned stands, and that light is not normally a major factorcontrolling epicormic bud emergence. The decrease in wood qualityassociated with epicormic shoots produced by thinned standsappears on this evidence to be the result of a long term promotionof epicormic branch growth and longevity. Thinning in July,rather than during the winter months, inhibited epicormic shootemergence the next spring. 相似文献
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Seedling emergence, growth, and allocation of Oriental bittersweet: effects of seed input, seed bank, and forest floor litter 总被引：3，自引：0，他引：3
Joshua W. Ellsworth Robin A. Harrington James H. Fownes 《Forest Ecology and Management》2004,190(2-3):255-264
The establishment of invasive plant populations is controlled by seed input, survival in the soil seed bank, and effects of soil surface disturbance on emergence, growth, and survival. We studied the invasive vine Celastrus orbiculatus Thunb. (Oriental bittersweet) to determine if seedlings in forest understory germinate from the seed bank or from seed rain. We also conducted a greenhouse experiment to investigate the role of leaf litter mass and physical texture on seedling survival, growth, and allocation. In the understory of an invaded mixed hardwood forest, we measured seed input, seedling emergence with seed rain, and seedling emergence without seed rain. Mean seed rain was 168 seeds m−2: mean seedling emergence was 107 m−2, and there was a strong correlation between seed rain and seedling emergence. The ratio of seedlings to seed input (0.61) was close to the seed viability (0.66) leaving very few seeds to enter the seed bank. Seed bank germination under field conditions was low (1 seedling m−2). Soil cores were incubated in a greenhouse to determine seed bank viability, and germination from these soil cores did not occur. To determine how litter affects seedling establishment and growth, we measured seedling emergence and biomass allocation in a greenhouse experiment. Seeds were placed below intact and fragmented deciduous leaf litter in amounts ranging from zero to the equivalent of 16 Mg ha−1. Seedling emergence was not affected by fragmented litter, but decreased to <20% as intact litter increased to 16 Mg ha−1. Increasing litter resulted in greater allocation to hypocotyl and less to cotyledon and radicle, and this effect was greater in intact litter. C. orbiculatus seedlings achieve emergence through forest floor litter through plasticity in allocation to hypocotyl growth. The low survival of C. orbiculatus in the seed bank suggests that eradication of seedling advance regeneration and adult plants prior to seed rain may be an effective control strategy. However, the intact forest floor litter of an undisturbed forest will not prevent seedling establishment. 相似文献
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4种槭树种子的休眠原因及催芽方法试验 总被引：1，自引：0，他引：1
乡土树种鸡爪槭、色木槭、元宝枫和美国红枫等4个树种的种子都具有显著的休眠特性。采用人工介入手段进行休眠原因和催芽技术试验研究,结果表明:这4种槭树种子的种皮含有的化学物质和机械性阻碍导致了槭树种子的休眠;采用层积处理和GA3赤霉素浸种,能明显缩短种子的休眠期;彻底解除供试种子的休眠方法就是延长浸种沙藏层积的时间。措施,对保证育苗生产,提高出苗率和出苗整齐度有一定的研究价值。文章从层积处理和赤霉素处理入手,研究不同条件下催芽处理的效果,以此解释休眠的原因。 相似文献
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柳杉苗期物候观测及苗木性状的逐步聚类分析 总被引：1，自引：0，他引：1
根据 1983年在霞浦杨梅岭林场所育的柳杉 30个种源苗期物候观测数据分析表明 :柳杉种子膨胀期为 4月 3～ 9日 ,发芽期在 4月 10～ 12日 ,真叶出现期在 4月 10～ 18日 ,出苗始期在 4月 12～ 2 4日 ,出苗高峰期在 4月 30日～ 5月 6日 ,出苗末期在 5月 1～ 8日。平均场圃发芽率 2 9 4 % ,最高为 78% (浙江临海、上杭步云 ) ,最低为 4 % (宁德霍童 )。苗木高、径生长高峰期在 9～ 10月 ,分别占年生长量的 5 2 1%和 5 6 8% ,9～ 10月的苗木长势将对苗木品质的影响极大。对苗木性状的逐步聚类分析表明 ,苗木品质好的种源有湖南南岳等 5个种源 ,苗木品质差的种源有宁德霍童等 5个种源 相似文献