开发城市地下空间前景广阔

本文介绍了开发城市地下空间的必然趋势及前景，阐明开发利用城市地下空间，对节省城市用地、节约能源、改善城市交通、减轻城市污染等都有着重要作用。     

以鄠邑区为例的基数转换要点研究

随着各级国土空间总体规划工作的推进,明确各地现状数据的工作日渐紧迫。以三调为基础的现状数据不能满足和符合国土空间总体规划的工作要求,所以在三调基础上科学准确的衔接规划编制所需的空间关联信息和现状数据,形成科学、准确的现状底图是保证空间规划编制科学有效的基础。因三调数据与其他关联数据在坐标、分类等方面存在差异,因此需要对其进行分类转换。本文在梳理三调工作分类和规划用途分类对应关系的基础上,以鄠邑区为例,对具体实践中遇到的主要问题提出相关建议。     

基于生态承载力的黄土高原地区城镇体系空间结构演化——以庆阳市为例

庆阳市位于黄土高原中部丘陵沟壑区,气候干旱,生态脆弱。运用生态承载力、城镇体系相关理论和方法,分析研究区城镇体系空间结构演化特点及趋势。采用生态弹性度、资源承载力和承载压力度、对生态承载力的演化进行综合评价,并对生态承载力与城镇空间结构的关系进行探讨。在此基础上,对研究区城镇体系空间结构进行调整优化,为脆弱生态条件下的城镇发展提供依据。     

基于不同城市空间类型的广州天际线特点研究

通过对广州城市天际线不足之处的分析,对广州居住区、政府办事区、城市公共绿地等不同城市空间类型的景观天际线特点进行研究,分析其对人们的环境感染力。同时,对广州城市景观天际线的营造提出建议,为创造典型、有特色的城市空间环境提供参考依据。     

空间诱变育成水稻品种对硒的生物富集能力研究初报

以粤航1号、航香糯和航小占3个空间诱变育成水稻品种(系)及其亲本长丝占、南丰糯、籼小占为试验材料,采用喷施硒肥富硒康的方法,进行空间诱变育成水稻品种对硒的生物富集能力研究.结果显示:在施硒肥(或不施硒肥)条件下,空间诱变育成品种(系)稻米(包括精米和糙米)的硒含量与其亲本之间差异不显著,各品种稻米的硒含量均极显著增加,与不施硒肥处理相比,精米的硒含量增加3.435倍、糙米的硒含量增加4.204倍.     

鸡冠花新品种‘荣华鸡冠花’

‘荣华鸡冠花'是广东地方品种‘早水鸡冠花'种子经卫星搭载诱变后,经5代以上系统选育出的新品种。平均株高26.32 cm,株幅30.92 cm;鸡冠形花序数9个,冠色猩红;叶片长卵形、黄绿色;属早花型,花期60 d以上。耐热性强,适合全国各地夏季和华南地区周年栽培。     

浅谈引种植物在拉萨市绿化中的应用

合理引进和应用多样化的植物,有利于丰富城市生物多样性,提高城市人与自然的和谐发展。     

鸡冠花新品种‘彩虹鸡冠花’

‘彩虹鸡冠花’是从‘早水鸡冠花’航天诱变的种子后代中选育出的新品种。株高33.37 cm,冠幅25.23 cm,花序枝8.75条,穗状花序鸡冠状,出冠整齐一致,花冠排列平整,冠长8.17 cm,冠宽4.95 cm,冠色紫红,花期长,达74 d以上。群体整齐性好,适合夏季露地栽培。     

Growth response of Ficus benjamina to limited soil volume and soil dilution in a skeletal soil container study

The interactive effects of rooting volume and nutrient availability in a skeletal soil medium designed to meet street tree and pavement needs were observed in a containerized experiment. Benjamin fig (Ficus benjamina L.) was grown in a stone-soil blended skeletal soil material (CU-Soil™) and compared to a loam soil. The same topsoil used as the soil component in the skeletal soil material was used as the sole component in the comparison soil-only treatment.Plants grown in the skeletal soil material had reduced leaf tissue N content and depressed growth compared with plants grown in non-diluted soil. No other mineral deficiencies were found. Leaf number, chlorophyll concentration, shoot weight, and root characteristics were all affected.Reduced growth from soil dilution could be offset by the provision of an enlarged rooting volume for root development. Large containers of skeletal soil were observed to have smaller root systems compared to equivalent net volumes of loam soil at the first two harvest dates of the study. By the end of the study, the large containers of skeletal soil were observed to have developed larger root systems compared to equivalent net volumes of loam soil; resulting in comparable leaf N levels and total plant dry matter. Plants in skeletal soil had lower shoot: root ratios at the end of the study. Investing resources to further root growth in times of nutrient shortages is a probable plant reaction as evidenced by differences in specific root length between treatments. The study allowed a method for directly partitioning the containerization effect by having equivalent amounts of soil over two volumes.     

The re-emergence of indigenous forest in an urban environment, Christchurch, New Zealand

Christchurch, the second largest city in New Zealand is a planned city on a coastal plain on the east coast of the South Island. The birth of the city and the subsequent century of development was characterised by colonial values and tree and garden planting with familiar European species along with those from Australia, North America, and eventually all other continents. The image of an “English garden city” with classical parks of oaks and willow-lined rivers became the accepted norm and the way in which the city has been promoted to potential tourists. Gardening is one of the top two recreational activities and exotic species greatly outnumber native species in the flora and in gardens. This has had serious consequences for the highly fragmented and degraded indigenous vegetation and its co-adapted wildlife. A few hardy indigenous species continued to regenerate through this period, but since the 1970s, there has been a progressive change of attitude and interest in reclaiming the natural heritage of the city, manifest in widespread private and public planting of indigenous species and active habitat restoration. In this article we examine the indigenous and exotic shrub and tree components of the Christchurch flora as planted street trees, in domestic gardens, and in parks. We also present data on shrub and tree regeneration in parks and domestic gardens in the city. Indications are that the more sensitive, less intrusive management of urban environments, combined with the greater density of indigenous seed sources, has allowed regeneration of a wide range of indigenous species across a broad spectrum of habitats – from neglected gardens to pavement cracks to exotic plantations. This is despite the competition from the prodigious seed banks and density of exotic trees, shrubs, and ground covers and albeit minimal impacts of introduced browsing and seed eating mammals. If the present trends continue through appropriate management and facilitation, these tentative signs of native forest regeneration should eventually proliferate into a sustainable mixed origin urban forest that resurrects and preserves the natural character of the region.