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N＋离子束注入对高羊茅种子发芽率的影响 总被引：1，自引：1，他引：0
以N 离子束对高羊茅种子进行注入,研究了不同注量、不同脉冲次数及不同注入方式下高羊茅种子发芽率的变化情况.结果表明:在相同能量注量梯度下,采用小靶室2次脉冲注入和4次脉冲注入,高羊茅种子发芽率随注量梯度的增大而降低,且2次脉冲注入下,高羊茅种子发芽率降低趋势更为明显;采用大靶室批次处理,2次脉冲注入,在所有注量梯度下,高羊茅种子发芽率为0. 相似文献
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高羊茅属冷季型草,是长江中下游地区(草坪过渡气候带)条件下一种重要草坪。它较之其它冷季型草坪如多年生黑麦草、早熟禾等,适应性和抗性均优,在养护管理措施得当的情况下可基本做到四季常绿。高羊茅色泽深,成坪快,具良好的耐践踏能力,夏季能耐高温、干旱,抗病虫害能力较强,耐修剪。我们在上海、江苏、江西、湖南等地建坪养护均获成功,使高羊茅草坪达到了四季常绿。一、水分管理高羊茅草坪夏季水分管理尤为重要。当白天温度高于30℃,夜间温度高于20℃时,水分管理不当极易引发病害,甚至导致高羊茅草坪的成片死亡。一般要求每天早晨10时以前进… 相似文献
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不同温度对高羊茅种子发芽的影响 总被引：4，自引：0，他引：4
高羊茅种子在不同温度下的发芽实验结果表明：高羊茅最适宜播种的温度为20—25℃，温度高至30℃，发芽率显著下降，不宜播种；温度低至10℃，平均发芽速度显著减小，发芽率有所下降。 相似文献
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用不同种类的基本培养基及不同浓度2,4-D、6-BA,对本地高羊茅的种子进行愈伤诱导.结果表明:基本培养基种类对愈伤诱导无明显的效果;MS培养基下不同浓度2,4-D、6-BA对高羊茅愈伤诱导时间及出愈率差别很大,以9 mg/L效果最佳,愈伤诱导率达70.2%左右;过高浓度2,4-D、6-BA对萌芽和愈伤的形成有负作用;愈伤组织分化以MS-BA2.0 mg/L-NAA0.5 mg/ L为最佳 MS基本培养基,2,4-D浓度以9.0 mg/L为最佳,最适合高羊茅愈伤组织诱导的培养基为MS 9.0 mg/L2,4-D. 相似文献
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为了解决高羊茅冷季型草种在武汉安全越夏的问题,进行了Houndog、Arid、Barlexal等高羊茅品种单播及品种混播试验,结果表明:Houndog、Shenandon、Barlexal、Arid品种在本地区越夏情况表现较好。Arid+shenandon、Houndog+Shenandon等比例混合播种,其草坪抗病性比单播的明显增强。 相似文献
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本研究以草坪草高羊茅为材料，将实验室分离的三种细菌(E、F、H)制成菌剂，并将三种细菌制剂应用于草坪草，测定其对草坪草抗旱性及抗病性的影响。结果显示，三种菌剂分别与复合肥混合使用效果最佳，可有效促进草坪草生长，减少电解质透出率和丙二醛含量，增加草坪草游离脯氨酸含量、硝酸还原酶含量和叶绿素含量，增强了草坪草的抗旱性。接种立枯丝核菌后，菌剂与复合肥混合使用可推迟草坪草的发病时间并减少病斑数量，过氧化物酶活性、多酚氧化酶活性及苯丙氨酸解氨酶活性均高于其它处理，草坪草对立枯丝核菌的抗性明显增强。 相似文献
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4种禾本科牧草种子的抗旱性评价 总被引：10，自引：0，他引：10
通过对20%PEG处理种子96 h后的胚芽伸长速度、种子吸水速率、种子萌发胁迫指数等3项抗旱性指标的测定,并采用抗旱性综合评价法,评价了狗牙根(1号)、波特鸭茅(2号)、德梅特苇状羊茅(3号)、黑籽雀稗(4号)4种禾本科牧草种子的抗旱性能。用20%PEG处理种子96 h后的胚芽伸长速度评价4种牧草种子的抗旱性,其抗旱性由强至弱的顺序为:3号>2号=4号>1号;用种子吸水速率评价4种牧草种子的抗旱性,抗旱性由强至弱的顺序为:2号>4号>3号>1号;用种子萌发胁迫指数评价4种牧草种子的抗旱性,抗旱性由强至弱的顺序为:3号>1号>4号=2号;用综合评价方法评价4种牧草种子的抗旱性,抗旱性由强至弱的顺序为:3号>2号>4号>1号。 相似文献
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本文以江苏省宿迁市绿化常用草本植物高羊茅为研究对象,通过植物学和材料力学的研究方法,对高羊茅根系的土体分布特征和单根抗拉力学特性进行研究分析。结果显示:在0~40 cm土层中,高羊茅直径≤1.0 mm的根系密度大于直径>1.0 mm的根系,且其生物量随土层深度的增加而减少;高羊茅根系的单根抗拉力与根系直径之间呈正相关关系,抗拉强度与直径之间呈负相关关系。研究表明高羊茅根系具有较强的固土护坡能力,可以有效增强土体稳定性,在减缓公路土石边坡水土流失方面发挥较大作用。 相似文献
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不同处理对4种草坪种子发芽的影响 总被引：5，自引：0，他引：5
采用正交试验设计，研究了硝酸钾、赤霉素浸种对剪股颖、紫羊茅、黑麦草、狗牙根种子发芽的影响(主要考查了发芽势、发芽率、简化活力指数等指标)。实验数据及分析结果表明：黑麦草以0．1％KNO3、紫羊茅以0．3％KNO3、狗牙根以300g/L GA3 0．1％KNO3处理效果较好，剪股颖以不处理为好。 相似文献
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A split-plot experiment was conducted in southern Chile to study the effects of tree cover and level of fertilizer application
at establishment on the morphology and development of the legumes Lotus uliginosus and Trifolium subterraneum, when sown in
conjunction with Festuca arundinacea as the companion grass. Trees were 13-year-old Pinus radiata, spaced at 4 × 12.5 m intervals
and with a mean canopy diameter of 4.8 m. At 150 days after sowing the total area of Lotus leaves and length of Lotus stems/plant
were not affected by tree cover. Individual plants had fewer stems but they were longer. For Trifolium, despite large increases
in individual petiole length and leaf area, total petiole length and leaf area/plant were reduced by tree cover because of
a reduced number of petioles/plant. At 275 days after sowing, the number and weight of Lotus components/ha was not affected
by tree cover, although companion grass development was reduced. By 640 days the number and weight of Lotus components/ha
was reduced but only to the same degree as the companion grass. Trifolium plant development, and in particular seed yield,
was affected by tree cover at 275 and 640 days and to a greater extent than Lotus or the companion grass. A high level of
fertilizer application at establishment induced a greater development of both legumes at 275 days, but by 640 days the effects
were much reduced. It is concluded that both Lotus uliginosus and Trifolium subterraneum respond to tree cover by increasing
stem length and leaf area, but that in situations with low soil fertility, the development of Lotus is less affected by tree
cover than Trifolium.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Assessing the characteristics of seed supply will be vital to better understand the dynamics of forest regeneration. In this study, we surveyed the aboveground vegetation, the seed rain, the seed bank, and natural seedling emergence in four typical 24-year-old plantations (eucalyptus, mixed-native, mixed-legume, and mixed-conifer) and a naturally successioned shrubland in southern China. The dominant species in the understory were similar among the five plant communities. The seed rain and the seed bank were dominated by shrubs and herbs but indigenous tree species were rare. Species that were common to all five-plant communities represented a great proportion of the seeds in the seed rain and seed bank. The seed rain consisted mostly of seeds derived from the local plant community. Seed abundance was greater in the seed bank than in the seed rain, and species richness was greater in the seed bank and in the corresponding plant community than in the seed rain. Species composition similarity between the seed rain, the seed bank, and the aboveground vegetation was low, because the seed rain contained much fewer species, and the seed bank and aboveground vegetation contained many different species, respectively. These findings indicate that both the seed rain and the seed bank play important roles in providing seeds for plant recruitment in the understory, but the seed bank contributes more than the current seed rain to the diversity of recruited plants. The current plant community has little impact on the qualitative composition of the seed rain and seed bank. Based on these data, it appears that succession to the desired zonal, mature forest community is unlikely to result from seeds in the seed rain or seed bank. Lack of seed availability of desired zonal mature forest species is the main bottleneck currently limiting succession in the plantations. Reintroduction of late-successional species could facilitate the desired succession. 相似文献
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文冠果种子产量低,这是制约其大力开发与利用的瓶颈。为给文冠果优良品种的选育和文冠果资源评价和利用提供科学依据,对新疆维吾尔自治区奇台县的160株文冠果单株的种子质量、结果个数、果实质量等21个性状指标进行了调查,并采用变异分析、相关性分析和主成分分析等分析方法,对影响其产量的主要因素进行了探讨。变异分析结果表明:被调查的160株文冠果单株各性状指标间均存在明显差异;其中,单株结果个数的变异系数最大,为82.98%;叶密度的变异系数最小,为8.77%。相关性分析结果表明:单株种子质量与树高、地径、冠幅、果实纵径、种子长、单果种子质量、单株结果个数、单株果实质量、百果质量、百粒种子质量、叶长、叶宽、叶面积、果皮厚度、单果种子粒数及种子宽之间均存在显著正相关。主成分分析结果表明:从21个性状指标中提取了7个主成分,即单果产量、单株产量、果实产量、叶形、种形、果形、树形这7个因子,其累积贡献率达74.693%;依据各主成分贡献率的大小,在育种中可选择单果种子质量大、单株结果个数多、单株果实质量大、叶长、种子长、果纵径长、冠幅大的单株作为优良高产植株。 相似文献