共查询到19条相似文献,搜索用时 62 毫秒
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多姿多彩的园艺观赏草 总被引:1,自引:0,他引:1
轻舞飞扬,光影朦胧,潇洒飘逸,富自然野趣,朴素无华,耐人寻味,强健易栽,这些都充分演绎了园林植物大家庭中的新成员——观赏草的天生丽质和独特魅力。 相似文献
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大花金鸡菊和大米草 总被引:1,自引:0,他引:1
高尚士 《国土与自然资源研究》1994,(2):58-59
大花金鸡菊和大米草高尚士l大花金鸡菊的观赏与经济价值大花金鸡菊(COrenPsl’sIanceolataL.)是菊科多年生宿根性花卉。原产北美密执安、弗罗里达及新墨西哥州。我国1936年作为观赏植物引种栽培,目前各地除供观赏外,还用作全草人药,以及从... 相似文献
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分析了观赏草的美学价值、生物学价值和应用价值。并初步探讨观赏草在黑龙江省开发和应用的前景、存在的问题和对策。 相似文献
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介绍可持续旱景园林的定义,描述观赏草的观赏特征与习性,重点分析黑龙江省的主要旱生观赏草种类,介绍了它们的特征、生境、繁殖方式与应用,探讨了它在使用中需要注意的问题。 相似文献
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最能体现自然之美的观赏草 总被引:1,自引:0,他引:1
观赏草是园林中的功能植物,能解决环境绿化和美化中许多实际问题,如护坡、保持水土、节约养护成本和时间等。观赏草的株型体量、线条质地、花型花色、叶质叶色均有着与其他类别的园林植物无法取代的多样性变化,给园林应用提供了取之不尽,用之不竭的构造素材。与一般花卉的艳丽色彩不同,观赏草色彩柔和且着色均匀,其色感效果随植物数量的累加而增强。它们的美是群体的美、自然的美,从色彩、形式到质地均显示出它们与众不同的魅力。 相似文献
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细辛又叫细参,为马兜铃科植物。多年生草本,以全草入药,有散风祛寒、行水止痛的作用。适宜河北、内蒙古、河南、陕西及东北三省等地种植。现将栽培技术介绍如下:一、生长环境。细辛喜阴凉湿润,富含腐殖质的背阴坡或稀疏林地栽培。粘重土壤、积水低洼地不宜栽培,忌阳光直射。由于细辛种子胚有后熟过程,需保湿润,干种子不易出苗。二、繁殖方法:细辛有种子繁殖和分株繁殖两种。(1)种子繁殖:于6月份果实由紫红色变为粉白色,手捏果肉软,呈粉沙状时即为成熟。随熟随采,否则种子易脱落。采收后,搓去皮立即播种,发芽率在90%以上。… 相似文献
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从外来移民垦荒的角度,运用历史分析方法,在掌握不同时期垦殖情况的基础上,分析了建国前东北垦殖在耕地规模扩大、耕作方式、种子改良和农作物新品种培育等方面对黑龙江垦区经济发展的影响。 相似文献
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引种凯旋金露梅(Pote ntilla fruiticosa Coronation Triumph),开展适应性、植物学、物候期观测、生长节律、生长量、繁殖及栽培技术等研究,结果表明,凯旋金露梅适应性强、观赏价值高、应用功能全面、适宜城市绿化中栽植应用。 相似文献
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刘昕昀 《国土与自然资源研究》2011,(5):69-70
良好的绿化景观是校园精神文明的重要体现.因此,在高校校园绿化过程中,应该加强校园植物种植规划设计的研究,充分发挥不同树种的美化和育人功能. 相似文献
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本文尝试利用投影寻踪模型对我国沿海省份的海水养殖产业竞争力进行综合评价。首先,从海水养殖概况入手,简要介绍了我国海水养殖的基本现状;其次,介绍了投影寻踪模型,该模型应用一般要经过五个步骤;最后,阐述了投影寻踪模型在区域海水养殖产业竞争力综合评价中的应用,并结合评价结果进行了分析。 相似文献
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Shifting cultivation and forest pressure in Cameroon 总被引:1,自引:0,他引:1
Amy Ickowitz 《Agricultural Economics》2011,42(2):207-220
Shifting cultivation is often blamed as a principal cause of deforestation in tropical Africa. It is claimed that the practice is unsustainable because shortened fallow lengths result in soils too degraded to support forest vegetation. The decline in fallow lengths is often attributed to increases in population density and greater market participation. The conventional wisdom makes several claims that are as yet unsubstantiated. This article investigates whether there is evidence to support two of these claims in southern Cameroon. First, using both cross‐sectional and panel data, I find that there is indeed a robust negative association between fallow lengths and population density in the study area and weaker evidence for a negative relationship between fallow lengths and market participation. Second, a stochastic frontier production function approach is used to investigate the marginal contribution of fallow to output. Results indicate that fallow lengths are not low enough to be affecting yields and therefore do not appear to be resulting in declines in soil fertility. Thus overall, while some of the assumptions of the conventional wisdom appear to be true, there is little evidence to support its dramatic conclusion that shifting cultivators are causing deforestation in the forested region of Cameroon. 相似文献
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One consequence of increasing agricultural trade is a shift of geographic location of agricultural activity to more economically productive countries. Whether or not the economic efficiency translates to environmental efficiency for agricultural goods is an open question. To examine environmental implications of shifting agricultural location, we analysed the life-cycle greenhouse gas (GHG) emissions of rice production in Japan and the US for the Japanese market in a comparative manner. This paper presents the life-cycle assessment of brown japonica rice. Our computation of GHG emissions of rice production in Japan and the US were 3.54 and 2.99?kgCO2-eq kg-rice?1, respectively. With respect to harvested area, the emissions were 18.4 in Japan and 27.8?tCO2-eq ha?1 in the US. For Japan to be environmentally competitive with the US production, fundamental restructuration of field size is necessary to increase yield. In conclusion, economic efficiency does not translate to environmental efficiency with the case of rice production. Importing rice is both economically and environmentally viable option for the Japanese market. 相似文献
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阐述了构建合理的旅游空间结构对大连市旅游业发展的重要意义;对大连市旅游系统进行空间结构分析,得出了其旅游空间布局不平衡、旅游中心地体系不健全、旅游发展互动性不强等问题;提出了大连市旅游系统空间结构优化的5种途径:加强各旅游区的空间合作、构建一体化的旅游圈、构筑便捷畅通的旅游交通网络、构造结构完善的旅游空间格局、统筹设计合理的旅游线路。 相似文献