共查询到20条相似文献，搜索用时 375 毫秒
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木棉(Gossampinus malabarica)又名攀枝花、红棉、英雄树、烽火树,属木棉科木棉属落叶高大乔木.木棉广泛分布在我国四川、云南、贵州、广西、广东,生长在江河沿岸、山地阳坡及村边道路旁,喜光、耐高温,对土壤要求不苛刻.在四川攀枝花地区木棉树于1月-2月份开花,先花后叶,花色艳丽,有红色、金黄、淡黄色等颜色,树形高大伟岸,是优良的园林绿化树种.木棉树现是攀枝花市市花和广州市市树,在园林绿化中常作行道树、庭荫树、景园树、盆景树等.木棉经嫁接后2 a-3 a开花,嫁接苗可作盆景矮化栽培,观赏价值高.本文介绍了木棉的嫁接育苗技术. 相似文献
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近年来,绿色建筑成为国内乃至国际建筑界、房地产界的一个热点话题,绿色建筑的发展也越来越受到关注,许多国家都开展了绿色建筑的研究和实践,取得了很多的研究成果.尤其在去年经历了一场与"非典"的斗争之后,人类更加深刻地认识到绿色建筑在生活中的重要性,由此也引发了一场关于绿色建筑的革命,将绿色建筑向更深入、更科学的方向推进. 相似文献
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One compound approach combining factor-analytic model with AMMI and GGE biplot to improve multi-environment trials analysis 总被引：1，自引：0，他引：1
To improve multi-environmental trial(MET)analysis,a compound method—which combines factor analytic(FA)model with additive main effect and multiplicative interaction(AMMI)and genotype main effect plus genotype-by-environment interaction(GGE)biplot—was conducted in this study.The diameter at breast height of 36 open-pollinated(OP)families of Pinus taeda at six sites in South China was used as a raw dataset.The best linear unbiased prediction(BLUP)data of all individual trees in each site was obtained by fitting the spatial effects with the FA method from raw data.The raw data and BLUP data were analyzed and compared by using the AMMI and GGE biplot.BLUP results showed that the six sites were heterogeneous and spatial variation could be effectively fitted by spatial analysis with the FA method.AMMI analysis identified that two datasets had highly significant effects on the site,family,and their interactions,while BLUP data had a smaller residual error,but higher variation explaining ability and more credible stability than raw data.GGE biplot results revealed that raw data and BLUP data had different results in mega-environment delineation,test-environment evaluation,and genotype evaluation.In addition,BLUP data results were more reasonable due to the stronger analytical ability of the first two principal components.Our study suggests that the compound method combing the FA method with the AMMI and GGE biplot could improve the analysis result of MET data in Pinus teada as it was more reliable than direct AMMI and GGE biplot analysis on raw data. 相似文献
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溶氧超标"毒水症" 危害及症状:水体中因施放过多未经发酵的肥料,生肥在塘底分解出很细小的甲烷和硫化氢的小气泡,鱼苗误当食物吞入.其主要症状是:鱼鳃上会粘附许多小气泡,使鱼体上浮或游动失去平衡.鱼的肠道中有白色气泡,或鱼的体表、鳍条、鳃丝上附有较多的气泡,鱼体漂浮水面,沉不下去,严重的可致鱼类成批死亡. 相似文献
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Natural spruce-fir mixed stand is one of the main forest types in the world,and also has huge ecological,economic and social benefits.According to the structural characteristics and succession laws of natural spruce-fir forest,it is urgent and significant to develop scientific management measures for natural spruce-fir mixed stand in line with local conditions.The article outlined the characteristics of the distribution and structure, regeneration and succession laws of natural spruce-fir forest,and analyzed the current situation and existing problems of natural spruce-fir forest management.The following recommendations were eventually made:1) In no cutting area,all logging activities should be banned.In a restricted cutting area,the cutting intensity should be generally controlled within 15%of the stock volume before cutting.On the commodity forest management area, the appropriate cutting intensity should be determined according to the volume per hectare,determine and classification management should be implemented in accordance with the characteristics of forest,to ensure the scientific selective cutting.2) Closure for afforestation,planting and repair planting should be adopted on vegetation-intensive land,sparse shrubs covered land and harvesting slash,in order to accelerate natural regeneration.3) The in situ conservation should be conducted in nature reserves and scientific experiment stations of rare and endangered species,such as Abies chensiensis,Picea neoveitchii,Abies vuanbaoshanensis,to reduce human destruction.4) It is supposed to collect seeds in time,establish nursery,actively establish forest, expand artificial population and promote natural regeneration. 相似文献
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沈阳市建成区树种现状分析 总被引：6，自引：0，他引：6
通过对沈阳市建成区城市树木的调查分析发现：沈阳市的各土地类型中的树木分布不均。其中，被调查的256块样地中每公顷物种小于或等于5种的样地有113块，占总调查样地的44．14％，每公顷小于或等于10株的样地共43块，占总样地的16．80％；利用械种多度重要性排序及累积贡献率获得了不同土地类型中的主要树种；多个生物多样性指数表明，公园性质的绿地树种多样性最高，企事业单位用地与居住区用地次之，街道类用地较低，而商业金融用地最低；并对沈阳市的树种发展提出建议。 相似文献
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冰砬山天然次生林群落结构与物种多样性特征 总被引：3，自引：0，他引：3
根据在辽宁冰砬山16块天然次生林样地的调查数据,对天然次生林的植物群落结构和物种多样性特征进行了研究,测定了各层次植物物种的重要值,采用多种方法计算各层次物种的丰富度指数、均匀度指数和多样性指数。结果表明:冰砬山天然次生林群落成层现象和各层次优势种比较明显,依重要值排序乔木层优势种为蒙古栎和紫椴,亚优势种为花曲柳、色木槭和怀槐;灌木层优势种为斑枝卫矛、金银忍冬、胡枝子和金刚鼠李,亚优势种为刺五加和胡榛子;草本层优势种为羊胡苔草。该地区天然次生林群落植物物种比较丰富,丰富度指数草本层最高,乔木层和灌木层较接近;均匀度指数和多样性指数灌木层最高,草本层最低,乔木层居中。 相似文献
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将大果沙棘的幼嫩茎尖、茎段外植体接种在1/2MS附加不同浓度配比的IAA,IBA,BA,NAA培养基上可诱导茎尖和腋芽生长,同时将小叶片和嫩茎接种于不同浓度配比的1/2MS和2/3MS培养基上诱导产生愈伤组织,愈伤组织继续培养后,表面形成大量的绿色突起,进一步分化成不定芽,将不定芽在不同的培养基中继续培养产生无菌外植体。 相似文献
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二乔刺槐愈伤组织超低温保存及适宜降温方法 总被引：1，自引：0，他引：1
二乔刺槐叶片在添加5 mg·L-16-BA的MS培养基上诱导出愈伤组织.将愈伤组织在冻存液(MS+10%DMSO+0.5 mol·L-1蔗糖)中于4℃预冷2 h,置人程序降温仪以1℃·min-1的速率降温至-7℃停留1 h,再以0.1℃·min-1的冷却速率将样品冷却至-20℃,平衡1 h,接下来以0.3℃·min-1的冷却速率将样品冷却至-40℃投入液氮保存,是适宜的降温方法.液氮保存1天后以38℃温水浴解冻.解冻后将愈伤组织用液体培养基(MS+6-BA 5 mg·L-1+30 g·L-1蔗糖)洗涤后转入恢复培养基暗培养,14天后放于光照下培养.光培养3天后冻后愈伤组织上开始长出新生愈伤组织颗粒,成活率最高可达52%,新生愈伤组织可诱导成苗. 相似文献