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蛇莓种子出芽率测试研究 总被引：1，自引：0，他引：1
蛇莓是一种观赏价值很高的多年生草本地被植物，一直没有在城市园林绿化中推广应用；作者利用2年的时间对蛇莓的种子繁殖进行了测试试验，测出了科学的蛇莓种子出芽率，此研究结果对于蛇莓的繁育以及在园林中的推广应用具有重要的意义。 相似文献
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对平顶山地区乡土地被植物蛇莓进行了种植试验与研究。观测其生物学特性,并作了耐旱性、抗寒性等分析,得出了蛇莓是具有园林推广价值、适应平顶山地区气候环境且园林效果突出、养护管理粗放的地被植物的结果。结合大面积试种试验,探讨了其综合的繁殖技术、管理措施等,为其在城市园林绿化中大面积推广提供了技术保障。 相似文献
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<正>蛇莓(Duchesnea indica Focke)蔷薇科蛇莓属多年生宿根草本,我国南北各省均有栽植。蛇莓为多年生双子叶植物,生长高度低,外观平整,覆盖度高,适于作地被植物。由于蛇莓具有广泛的适应性和较强的抗逆性,生长快,繁殖力强,成坪时间短,绿期长,耐荫性强,可观花、观叶、观果,管理粗放,不用修剪,管理成本低,可广泛应用于城市园林绿化。 相似文献
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对蛇莓的开花习性、花朵性状、枝叶性状、果实性状及蛇莓的移栽、匍匐茎的扦插及种子播种等习性进行了初步研究,表明蛇莓花、果、叶具有很高的观赏价值。蛇莓移栽容易成活,匍匐茎扦插易生根,是园林应用中优良的乡土地被植物。 相似文献
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对浙江中部地区一些野生植物的观测、试种,分析了算盘子、野菊、茅莓、蛇莓、硕苞蔷薇、节节草、何首乌、马兰等野生植物的形态特征、生态习性、繁殖特点和景观用途,对适合浙中地区园林种植的野生植物进行了探讨。 相似文献
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北京杨 毛白杨 山海关杨苗期生长规律的观测 总被引：1，自引：0，他引：1
北京杨毛白杨山海关杨苗期生长规律的观测＊⒇赵宏皂（唐山市城市绿化办公室０６３０００）为摸索杨树苗木生长规律，在生产中有针对性地采取促进苗木生产措施，培育优质苗木，１９９３年４月至１０月间，对北京杨、毛白杨、山海关杨进行了苗期生长规律观测。现将观测杨树... 相似文献
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干旱胁迫对5种园林绿化植物生理生化的影响 总被引：1，自引：0，他引：1
为给抗旱性较强的城市园林绿化植物的筛选提供依据,以5种园林绿化植物蛇莓、蛇莓萎陵菜、东北玉簪、紫萼玉簪和大萼铁线莲为试材,在持续干旱条件下,研究了园林绿化植物的渗透调节和抗氧化酶活性的响应特性。结果表明,持续15d干旱降低了土壤田间持水量,5种植物叶片水势和净光合速率随之下降。但是,蛇莓叶片水势和净光合速率降低的幅度比其它4种植物降低幅度小。干旱胁迫提高了叶片的丙二醛含量,细胞膜脂发生了过氧化。在持续15d干旱过程中,蛇莓和蛇莓萎陵菜叶片SOD活性增强。因此,蛇莓和蛇莓萎陵菜在干旱胁迫下能保持相对较高的光合速率,并利用酶促和非酶促系统清除氧自由基,表现出较强的抗旱能力。 相似文献
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通过对暴马榆1年生播种苗生长进行定期观测,采用Logist曲线对苗高生长过程进行拟合,建立生长模型,经对生长模型进行计算分析,结果表明:暴马榆1年生苗高生长相关系数达0.994 369,拟合效果显著。1年生暴马榆播种苗高生长过程可划为生长前期、速生期和生长后期。生长前期约35d,苗木累积生长量为15.3cm,累积生长率为23%;速生期约48d,苗木累积生长量为40.8cm,累积生长率为61.3%;生长后期约38d,苗木累积生长量为10.5cm,累积生长率为15.7%。 相似文献
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The intensive monitoring plots (Level II) of ICP Forests serve to examine the effects of air pollution and other stress factors
on forest condition, including tree vitality. However, tree vitality cannot be measured directly. Indicators, such as tree
growth or crown transparency, may instead be used.
Tree growth processes can be ranked by order of importance in foliage growth, root growth, bud growth, storage tissue growth,
stem growth, growth of defence compounds and reproductive growth. Under stress photosynthesis is reduced and carbon allocation
is altered. Stem growth may be reduced early on as it is not directly vital to the tree.
Actual growth must be compared against a reference growth, such as the growth of trees without the presumed stress, the growth
of presumed healthy trees, the growth in a presumed stress-free period or the expected growth derived from models.
Several examples from intensive monitoring plots in Switzerland illustrate how tree-growth reactions to environmental stresses
may serve as vitality indicator. Crown transparency and growth can complement each other. For example, defoliation by insects
becomes first visible in crown transparency while stem growth reaction occurs with delay. On the other hand, extreme summer
drought as observed in large parts of Europe in 2003 affects stem growth almost immediately, while foliage reduction becomes
only visible months later.
Residuals of tree growth models may also serve as indicators of changed environmental conditions. Certain stresses, such as
drought or insect defoliation cause immediate reactions and are not detectable in five-year growth intervals. Therefore, annual
or inter-annual stem growth should be assessed in long-term monitoring plots.
An erratum to this article can be found at 相似文献
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以色木槭、拧劲槭天然林解析木为对象,用Logistic模型对树高、胸径、材积生长进行拟合,研究其生长规律。结果表明：树高、材积生长拟合效果良好。色木槭树高生长9 a前为生长前期,9～31 a为速生期,20 a为生长高峰年,31 a后为生长后期;材积生长25 a前为生长前期,25～38 a为速生期,32 a为生长高峰年,38 a后为生长后期。拧劲槭树高生长9 a前为生长前期,9～40 a为速生期,12 a为生长高峰年,40 a后为生长后期;材积生长28 a前为生长前期,28～43 a为速生期,36 a为生长高峰年,43 a后为生长后期。色木槭、拧劲槭树高、胸径生长在15 a前比较接近,15 a后色木槭明显高于拧劲槭;色木槭、拧劲槭材积生长在18 a前比较接近,18 a后色木槭明显高于拧劲槭。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):479-498
Under certain environmental conditions, juvenile shoot growth characters might give early indications of adaptability and growth potential. Therefore, the reaction patterns of predetermined and free shoot growth were studied on Picea abies (L.) Karst, plants, which at different times during the growth period were treated by (1) application of nutrients, (2) defoliation, and (3) short days. Fertilization caused an increase in both predetermined and free growth, while defoliation and short day treatment caused a decrease in both forms of shoot growth and short days did not allow any free growth to occur. In the growth period following the treatments, fertilization caused more predetermined and less free growth to occur, while defoliation caused less predetermined and more free growth. Predetermined growth is explainable by the finite number of predetermined needle primordia. Free growth is initiated thereafter. It is influenced strongly by the environmental conditions and seems not to be influenced by the amount of preceding predetermined growth. Free growth enables young plants to utilize favourable growth conditions in summer for height growth precociously, which might increase their adaptability and competitive value. However, predetermined growth is the preferable mode of shoot growth because favourable conditions in successive growth periods induce more predetermined than free growth. Predetermined and free growth are well integrated forms of shoot growth giving no supporting evidence to the hypothesis that free and predetermined growth are inherited independently of each other. Rank changes in provenance development are probably not explainable by a loss in height growth when free growth occurs no more due to age, but by other causes. 相似文献
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通过对一平浪林区云南松的林分调查以及树干解析,分析了林分的树高、直径生长过程,结果表明,云南松生长发育过程可划分为苗木生长初期.树高速生期、直径速生期、速生后期和成熟期5个生长阶段.前5年为苗木生长初期,5～10 a是林分开始郁闭.高生长明显加快,10～25 a期间,云南松直径生长量也开始达高峰期,需要加强抚育管理措施;25～45 a期间,直径旺盛生长,树高保持一定生长量,而材积生长量保持最大,其后云南松进入速生后期,生长渐趋于缓慢,但仍保持较高的生长量.表明云南松速生期较长,可作长轮伐期经营,是培育大径材的理想树种. 相似文献
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以湖南省会同县的杉木为例，研究了直径生长率与树高生长率、材积生长率的相关关系。采用生长量修正法建立了杉木单木竞争生长量模型，回归拟合出树高生长指数κ的相关模型作为中介模型，推手出了杉木直径生长率、树高生长率、材积生长率的预估模型。 相似文献
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濒危植物白桂木种子繁殖苗年生长规律研究 总被引：6，自引：0，他引：6
通过白桂木播种育苗,研究白桂木1年生苗在苗期的生长规律。经定期观测和回归分析,模拟苗木生长与时间的数学模型。结果表明：采用有序样品聚类法将生长期划分为3个时期：生长初期、生长盛期、生长后期,生长盛期生长量占总生长量的60％-70％;用幂函数模型来模拟白桂木1年生苗各生长时期苗高和地径的生长情况的相关系数和拟合度最高。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):489-497
Growth rhythm, including growth initiation, growth cessation, growth period, and growth rate for Betula pendula were observed on two full‐sib trials of reciprocal recurrent selection and polycross. The results indicate that most of the characters of growth rhythm show significant differences among families and mating patterns. The variations of the characters of growth rhythm are more strongly under genetic control than those of growth rate. The correlations between most characters of growth rhythm and growth rate are highly significant. 相似文献
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福建柏苗高生长期划分的有序样本聚类分析 总被引：1，自引：0，他引：1
以福建柏苗高15 d净生长量为样本,采用有序样本聚类分析方法,将福建柏苗高生长过程划分为5个时期:出苗期为3月1~30日,幼苗期为4月1日~5月30日,速生前期为6月1~15日,速生期为6月16日~9月30日,生长后期为10月1日~12月30日。速生前期和速生期的净生长量只占全年总生长量的28.5%,而幼苗期、生长后期的净生长量分别占全年总生长量的30.0%、34.9%。因此结合福建柏的生理特性提出幼苗期、生长后期的管理措施,为培育福建柏优质壮苗提供依据。 相似文献