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用常规处理刺云实种子的方法,种子发芽率极低,为了提高刺云实种子的发芽率,采用98%的硫酸,进行不同时间处理种子的试验。试验结果:用98%浓硫酸处理种子10分钟效果最好,既提高了种子的发芽率,又缩短了种子发芽的时间。 相似文献
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不同处理对凤凰木种子发芽的影响 总被引:6,自引:0,他引:6
凤凰木是世界热带地区著名的园林绿化树种,在我国热带南亚热带地区广为栽培,用常规方法育苗,种子发芽率低、发芽不整齐。为了提高凤凰木种子发芽率,采用沸水浸泡、浓硫酸处理以及砂擦种皮等措施,对种子进行播种前处理、催芽。试验结果表明:3种方法均能显著改善凤凰木种子的发芽状况,但以浓硫酸处理效果最好,其发芽率、发芽势最高,分别比对照高4.9倍和11.7倍,且发芽速度最快,平均发芽速度比对照快3 d;其次是砂擦处理,其发芽率比对照高3.4倍;100℃热水处理的效果较差,其发芽率仅比对照高 1.3倍。 相似文献
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用天然群落枯枝落叶浸提液浸种与其它处理方法进行伯乐树种子发芽试验,试验分室内和大田萌发试验,室内又进行了不同浸提液、不同激素处理、不同温度处理对伯乐树种子发芽的影响.结果表明:(1)蒸馏水浸种发芽率>伯乐树群落枯枝落叶浸提液浸种发芽率>罗浮栲群落枯枝落叶浸提液浸种发芽率,但差异不大;其中蒸馏水处理的种子发芽率最高(69.2%).(2)以200mg· L-1 GA3浸种12 h发芽率最高,达到80.0%.GA3浸种的伯乐树种子发芽率>蒸馏水浸种的发芽> IAA浸种的发芽率.(3)大田试验的发芽率与室内试验发芽率基本接近;其中酒精浸提液处理的种子发芽率较高,达70.4%.(4)伯乐树发芽最适宜温度是20~25℃.发芽开始后第10~26天为发芽高峰期;发芽可持续32天.(5)在20℃条件下第7-14天腐烂率较高;随着温度的升高,高腐烂率出现的时间推迟,但发芽率相对降低. 相似文献
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《河北林果研究》2017,(Z1)
为了明确月见草种子(Oenothera biennis L.)的萌发特性,试验研究了不同浸种时间、不同浓度GA3和6-BA对月见草种子萌发的影响。结果表明,用清水浸种,16h时种子发芽情况最好,发芽势和发芽率都最高,分别为57.00%和34.00%,比对照组分别提高了103.57%和126.67%;随着GA3浓度的升高,月见草种子的发芽率、发芽指数均呈先上升后下降趋势,400 mg/L时种子发芽率达到峰值,为68.67%,高于对照77.58%;400mg/L的GA3对月见草种子的萌发有更好的促进作用;6-BA对月见草种子萌发的最适浓度为100mg/L,发芽率达到56.67%,比对照提高了46.55%。 相似文献
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珍稀树种银鹊树种子发芽条件的研究 总被引:4,自引:0,他引:4
在南京对银鹊树种子进行了不同种源、不同播种期、不同储藏方法及不同播前处理等发芽试验。结果表明:(1)银鹊树在3月上旬至中旬为其适宜的播种期;(2)水藏的种子发芽率高达95.2%,干藏的种子发芽率为10%左右。如能在播种前采取水浸处理,可适当提高发芽率和缩短发芽时间;(3)种源不同,发芽率也略有差异,湖南张家界种源发芽率最高,江西宜春种源较差。 相似文献
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厚朴萌条对植株地上部分总生物量、鲜叶重影响不明显,但萌芽条分散养分水分,严重影响主干胸径生长、树冠生长,对主干的树高生长也有一定的影响,因此要防止萌条发生,发生萌条后,要及时“除早、除小、除了” 相似文献
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油茶芽苗砧嫁接育苗关键技术 总被引:3,自引:0,他引:3
在油茶芽苗砧嫁接过程中,对砧木品种、嫁接时间、穗条叶片保留数量、穗条采摘部位和穗条新鲜程度5个试验进行分析,结果表明,不同处理对小苗嫁接的成活率、抽梢长度和抽梢粗度有一定影响。中果油茶种子做砧木嫁接成活率最高,为79.9%,不同砧木品种对嫁接成活率影响差异不明显,大果油茶种子砧木嫁接成活后90 d抽梢长度和粗度最大,分别为13.4 cm,3.6 mm。嫁接时间为5月15日的成活率、抽梢长度、抽梢粗度最高,分别为90.0%,12.7 cm 和3.2 mm,嫁接时间越晚,成活率越低。穗条叶片保留面大小对成活率及生长因素影响不大。采用母树上部穗条,嫁接成活率、抽梢长度、抽梢粗度与中下部相比差异极显著,分别为91.1%,13.3 cm 和3.3 mm。当天采摘即用于嫁接的穗条,嫁接成活率、抽梢长度、抽梢粗度分别为92.2%,14.5 cm,3.2 mm,显著高于保存了3 d 再用于嫁接的穗条,穗条存放时间越短,嫁接成活率越高。 相似文献
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Bonifacio Mostacedo Francis E. Putz Todd S. Fredericksen Armando Villca Turian Palacios 《Forest Ecology and Management》2009
A major impediment to the sustainable management of tropical dry forests in Bolivia is the scarcity of natural regeneration of commercial timber tree species. Where regeneration is present, true seedlings of many species are outnumbered by vegetative sprouts from roots, broken stems, and the stumps of felled trees. This study evaluates the importance of resprouts promoted by logging operations for the regeneration of commercially important canopy tree species. The objectives of the study were: (1) to characterize stump and root sprouting behaviors of canopy tree species harvested for timber; (2) to quantify the effect of logging on relative abundances and growth rates of stump sprouts, root sprouts, and true seedlings; (3) to relate the species-specific probabilities of stump sprouting to stump diameter and stump height; and (4) to explore how sprouting varies with the ecological requirements of canopy tree species. The study was carried out 1–5 years after logging of a privately owned land in a Bolivian tropical dry forest. Twenty-seven of the 31 species monitored resprouted at least occasionally, among which Centrolobium microchaete (Leguminosae-Fabaceae) and Zeyheria tuberculosa (Bignoniaceae) were the most frequent stump sprouters, and Acosmium cardenasii (Leguminosae-Fabaceae) and C. microchaete were the most frequent root sprouters. In all species the number of sprouts declined with increasing stump diameter and stump height. The probability of stump resprouting differed among species but did not vary consistently with stump diameter, except in Z. tuberculosa in which it declined. Approximately 45% of juveniles <2 m tall of canopy tree species originated from root or stem sprouts. Light-demanding species tended to regenerate more from seeds and root sprouts than from stumps. Seedling densities were higher in microsites opened by logging, while root and stem sprouts were equally common across microsites. Given their abundance and the fact that root and stem sprouts at least initially grew faster than true seedlings, we conclude that vegetative regeneration in this tropical dry forest is an important mode of post-logging regeneration especially for species that regenerate poorly from seed. Resprout management should be considered as a potentially effective strategy for the procurement of regeneration following logging, especially for species that do not readily recruit from seed. 相似文献
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不同直径伐桩对赤桉萌芽更新影响的初步研究 总被引:4,自引:0,他引:4
对速生树种赤桉进行了不同直径伐桩(2.1~6cm)萌芽更新影响的研究,结果表明:伐桩的萌芽率及平均萌条数随伐桩直径的增大而增大,萌条直径、高度随伐桩直径变化不大. 相似文献
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桉树枝瘿姬小蜂对几种桉树萌芽影响的观察 总被引:1,自引:0,他引:1
对广西博白县林区6种桉树遭受桉树枝瘿姬小蜂Leptocybe invasaFisher&La Salle的危害情况进行了调查,表明桉树枝瘿姬小蜂发生区内巨园桉Eucalyptus grundis×E.tereticomis DH201不适宜萌芽更新,窿缘桉E.exserta萌芽大部分出现虫瘿,尾叶桉E.urophllaU6萌芽出现部分虫瘿,巨尾桉E.grundis×E.urophlla广林9号萌芽少数植株受害出现畸形小叶,而尾赤桉E.urophlla×E.camadulensis DH184等未见虫瘿或畸形枝叶出现。 相似文献