共查询到20条相似文献,搜索用时 15 毫秒
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信阳市把蔬菜标准园建设工作与“菜篮子”工程相结合,严格按照标准园创建的总体要求,集成技术、集约项目、集中力量,扎实开展工作,健康有序地推进了全市蔬菜标准园创建工作,有力地促进和推动了信阳市蔬菜生产可持续发展,全面提升了蔬菜产品品质和经济效益,完善了产品质量安全管理制度,确保居民食菜安全. 相似文献
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韩蓉 《甘肃农业大学学报》2014,(3):101-106
展览花园是伴随着各种综合性的博览会、园林展和花园展而出现的一种园林景观表现形式,它展示了园林领域最新的设计理念和先进的技术材料.按展览目的,常见的展览花园大致分为艺术性、文化性和商业性3种类型.展示性、创新性、灵活性、独立性是展览花园设计的基本要求.近几年中国展览花园发展迅速,但仍然存在园林展园面积过大,形式单一,缺乏创新意识,植物景观欠缺,生态环保意识不够,展后利用不充分等问题亟需改进,相信通过园林工作者不断地探索和尝试,在不远的将来中国的展览花园会取得更好的成就. 相似文献
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Addicott WO 《Science (New York, N.Y.)》1969,165(3893):583-585
Analysis of distributional patterns of shallow-water molluscan faunas of the middle latitudes of the marginal northeastern Pacific Ocean discloses a sharp reversal during the Miocene of the progressive climatic deterioration. A low point in the Tertiary cooling trend during the Oligocene was followed by climatic warming that culminated during the middle Miocene, as illustrated by a series of zoogeographic profiles. 相似文献
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分析了住宅空中私家花园新颖美观、空间灵活多变、功能丰富和生态效应显著等特性,论述基于美学和生态视野营造空中私家花园的方法和内容,探索空中私家花园景观设计新的设计思路。 相似文献
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To assess whether and how environmental values and sense of place relate to sustainable farming practices, we conducted a study in South Kona, Hawaii, addressing environmental values, sense of place, and farm sustainability in five categories: environmental health, community engagement and food security, culture and history, education and research, and economics. We found that the sense of place and environmental values indexes showed significant correlation to each category of sustainability in both independent linear regressions and multivariate regression. In total, sense of place explained a larger share of the overall farm performance. However, each indicator showed relative strengths; environmental values showed significantly higher correlation to environmental and educational practices. Furthermore the scales were complimentary, and the use of both scales greatly improved prediction of good farming practices from a multiple-impact perspective. With implications for community and environmental impacts, results suggest that a more comprehensive view of farmers’ environmental values and place connections may help illuminate individual farmers’ decisions and sustainability-related practices. 相似文献
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农民合作组织是弱者的联合,民办公助是世界各国发展农民合作组织的普遍经验,国外发达国家在财政支持农民合作组织发展方面有很多值得我们学习借鉴的经验,国内在财政扶持发展农民合作组织方面正在不断地进行实践和探索,涌现了越来越多好的做法,这些经验和做法对我国农民合作组织的发展和壮大有诸多启示。 相似文献
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吕荣华 《浙江农林大学学报》2000,17(1):67-70
音乐用在时间里流动的有组织的乐音来塑造艺术形象, 表达人们的各种不同的感情;园林有着凝固于空间的节奏、旋律、音调和乐境。二者可以融会贯通。这2 门同源艺术有机地荟萃在一起, 将给人以丰富多样的审美感受, 并为音乐创作和园林设计, 提供借鉴和灵感。参5 相似文献
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帽儿山地区典型地表可燃物含水率动态变化及预测模型 总被引:1,自引:1,他引:0
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以北京市山区主要针叶林(侧柏林和油松林)为研究对象,通过对林分树冠可燃物的负荷量、结构、理化性质及火行为特征进行分析,建立了树冠可燃物水平连续性指数D和评估等级,并对侧柏林和油松林的可燃物水平连续性进行评估与分析。研究结果显示:可燃物负荷量对火蔓延速度的影响显著,随可燃物负荷量增大,火蔓延速度增加,增加幅度受到可燃物紧密度的影响;风速对火蔓延速度的影响十分明显,对可燃物水平连续性的影响程度大于坡度;相同风速下,油松林树冠火的蔓延速度大于侧柏林;侧柏林D的平均值为1.470(高度连续),油松林D的平均值为0.933(中度连续),侧柏林树冠火蔓延的危险性大于油松林,一旦发生火灾,侧柏林比油松林更容易形成大面积高强度树冠火;D的主要影响因素是针叶树种树冠负荷量及其空间分布,以及风速和坡度及其协同作用。 相似文献
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北京山区主要针叶林可燃物空间连续性研究——可燃物垂直连续性与树冠火发生 总被引:1,自引:1,他引:1
以北京山区主要针叶林(侧柏林和油松林)为研究对象,通过对林分中乔木、灌木、草本和枯枝落叶层的可燃物负荷量进行调查与分析,定量研究了森林可燃物的垂直分布规律。根据各可燃物种类负荷量垂直分布和树冠火发生的关系,建立了可燃物垂直连续性指数和评估等级,对2个针叶林的树冠火发生的危险性进行了评估与分析。结果表明:侧柏林发生树冠火的可能性较高,油松林相对较低;从垂直连续性指数看,侧柏林为1.002,高度连续,油松林为0.893,中度连续;侧柏林发生树冠火的危险性大于油松林,说明该指标能较好地描述和解释针叶林的可燃物垂直连续性及树冠火发生的危险性。 相似文献
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Barlett PF 《Science (New York, N.Y.)》1986,234(4779):1015
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对于城市广场这一异国文化现象的盲目移植造成了城市空间的浪费和自身特色的缺失.为了提高现代城市广场的利用率,营造生态、人性、亲和的城市广场空间,通过对城市广场发展历史的分析和自然山水园林理念的阐述,结合现代城市园林发展的现状,提出将自然山水式园林理念引入到现代城市广场设计,并以长沙高岭组团兴联东路市民广场醉樱园的设计方案为例,说明自然山水式城市广场的设计思路. 相似文献
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利用树木年轮学方法,通过研究长白山阔叶红松林建群树种红松和先锋树种山杨生长特征及其对气候因子 的响应,以期揭示不同物种对气候因子的响应差异。结果表明:红松和山杨对气候因子响应关系存在差异。红松 主要受上年冬季温度和降水的负作用,山杨主要受到生长季末降水的限制作用。在极端情况下,上一年冬季的高 温和较多降水以及当年生长季高温是导致红松形成窄轮的主要原因,而上一年生长季的较多降水和当年春季高温 是影响山杨生长的主要原因。因此,树木生长—气候因子的关系具有一定的物种特性。此外,还发现随着温度上 升和降水格局的改变,春季降水对红松生长的正效应以及月最低温度对红松和山杨的负效应将逐渐突显,这可能 是导致红松适宜区面积缩小的主要因素。 相似文献
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Mary K. Hendrickson Jere L. Gilles William H. Meyers Kenneth C. Schneeberger William R. Folk 《Agriculture and Human Values》2014,31(4):665-672
The development and utility of genetically modified (GM) crops for smallholders around the world is controversial. Critical questions include what traits and crops are to be developed; how they can be adapted to smallholders’ ecological, social and economic contexts; which dissemination channels should be used to reach smallholders; and which policy environments will enable the greatest benefits for smallholders and the rural poor. A key question is how the voices of smallholders who have experience with or desire to use GM technologies enter the larger debate. Africa has the greatest number of smallholders and poor with the least exposure to GM crops. Because of the well-established use of GM crops in South Africa by commercial farmers, we formed a community of practice (CoP) involving smallholders, extension, researchers, non-profits and agribusiness in KwaZulu-Natal to examine the conditions under which GM crops are used by smallholders, how smallholders interact with GM technologies and what insights smallholders and other stakeholders can provide regarding these questions. One of the advantages of the CoP approach is that it brings stakeholders together in a non-hierarchical way that encourages new ways of thinking and new partnerships. Such interaction around a specific project can enhance the voice of smallholders in a variety of ways. In our project, smallholder participants have increased their knowledge and can make better decisions about GM technologies, which had been barriers for them. Notably, they have also improved their knowledge of maize production practices, accessed new practice networks, and met new researchers and resource providers. They are now being integrated into these networks in a way that should improve their livelihoods and make the wants and needs of smallholders better known. Such knowledge and experience has improved their voice in agriculture and rural development discussions. 相似文献
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Porter JR Chirinda N Felby C Olesen JE 《Science (New York, N.Y.)》2008,320(5882):1421-2; author reply 1421-2