乡土树种在厦门岛山体林相改造中的价值

厦门岛山体植被存在树种单一、生态服务功能差、病虫害严重等问题,必须对岛内山体进行林相改造.借鉴国内外林相改造的成功经验,结合厦门的客观实际情况,讨论了乡土树种在林相改造中的独特作用,并对有可能推广利用的乡土树种做作了介绍.     

植物写生中的感观分析

从植物写生的要求和特点出发,在吸收传统理论知识的基础上,针对写生过程中观察生活、培养想象、加强艺术修养等各个环节作了探讨,从而使创造性的研究和运用在写生实践中得以更好的展现和发挥.     

一种通用的植物逼真几何建模方法

针对使用 L 系统进行植物几何建模的具体过程随规则定义的变化而变化的问题 ,提出了一种较为通用的基于 L 系统规则语言分析器的解决方法 ,即通过归纳和抽象得到可以定义多种 L 系统规则的语言 L- plants,并为其构造语言分析器 ,完成 L 系统开始状态和规则的识别 ,进行规则替换 ,以形成最终的字符串 ,最后使用形状语法对字符串进行解释 ,建立出植物的几何模型 .实验证明 ,该方法可以较大幅度地提高植物几何建模的效率     

Selenium species in buckwheat cultivated with foliar addition of Se(VI) and various levels of UV-B radiation

Common (Fagopyrum esculentum Moench) and tartary (Fagopyrum tataricum Gaertn.) buckwheat was treated by spraying the leaves with a water solution containing 15 mg Se per litre in the form of sodium selenate in the flowering period. The selenium content in all parts of plant was found to be less than 200 ng g⁻¹ in non-treated and in the range 2700–4650 ng g⁻¹ in selenium treated buckwheat. Exposure to UV-B radiation lead to higher Se accumulation in flowers of both Se enriched cultivars. For speciation analysis enzymatic hydrolysis was carried out, separation and detection of selenium species was performed by high performance liquid chromatography–ultraviolet treatment–hydride generation atomic fluorescence spectrometry (HPLC–UV–HG-AFS). In flowers and leaves, on average 11% of the Se content was soluble and in the form of Se(VI), representing between 0.6% (flowers) and 3% (leaves) of the Se content. The remaining soluble non-amino acid organic Se was not detected by HPLC–UV–HG-AFS. In seeds 93% of the selenium content was found in the extracts and the main selenium species was SeMet with 93 ± 5% relative to the selenium content.     

The Potential Use of Ozone in Municipal Wastewater

This paper summarizes the potential options applying ozone for the improvement of effluents from wastewater treatment plants. A specific focus will be on the technical aspects of how to integrate ozone technique in existing or new conventional treatment plants. Additionally some large scale projects will be illustrated, where this technique is now in operation. The following aspects are of interest and are discussed: necessary ozone dose range (depends on application, water matrix and contaminants); required components of ozone systems (ozone generator, gas supply, reaction system, off-gas handling); process control, online measurement; potential parameters to be used for process control; design guidelines for the integration of ozone systems; and cost calculations.     

基于L-System的植物生长仿真研究与实现

自然景物的模拟一直是计算机图形学中最具挑战性的问题之一,文章主要论述了以Visual C 6.0集成开发环境为编程工具,利用开放的图形接口技术OpenGL实现基于L-System的植物生长仿真研究与实现,文中重点论述了基于L-System的植物生长过程、树枝结构、字符串替换以及龟形等基本原理,并就基于L-System的植物生长仿真方法的具体设计与实现过程进行了探讨与论述,最后给出了利用L-System算法仿真植物生长的基本原理和方法,以L-System算法的核心--龟形行为,实现计算机自动绘制生成的树图.     

有机物质与植物抗逆性关系研究进展

综述了有机物质腐殖酸、氨基酸、VC等与植物抗逆性(抗旱、抗盐、抗高温或低温、抗病虫等)的关系,不仅为有机营养肥料和杀菌、杀虫剂的生产提供了依据,而且为生产栽培管理以及培育高抗逆性作物奠定了理论基础。随着人们对可持续农业发展的重视,以及植物有机营养研究的不断深入,有机物质腐殖酸、氨基酸等在生态农业和绿色食品生产中将发挥重要的作用。     

草坪常见病害及其综合防治技术

草坪草的生长过程中,常会受到各种病原菌的侵染和危害,从而严重影响草坪的整体观赏价值和使用价值.通过阐述草坪上发生的常见病害种类及其发生特点,并针对病害发生的特点提出防治意见,以期对城市绿化的养护和草坪病害的研究与防治具有一定的参考价值.     

核电厂放射性废物最少化的目标及其具体实施

本文介绍了核电厂放射性废物最少化的定义、目标,从源项控制、物料的再循环和复用、废物减容技术的应用以及管理最优化等四个方面讨论了如何在我国核电厂具体实施废物最少化,并对开展这方面的工作提出了一些建议。     

Biodiversity in urban habitat patches

We examined the biodiversity of urban habitats in Birmingham (England) using a combination of field surveys of plants and carabid beetles, genetic studies of four species of butterflies, modelling the anthropochorous nature of the floral communities and spatially explicit modelling of selected mammal species. The aim of the project was to: (i) understand the ecological characteristics of the biota of cities model, (ii) examine the effects of habitat fragment size and connectivity upon the ecological diversity and individual species distributions, (iii) predict biodiversity in cities, and (iv) analyse the extent to which the flora and fauna utilise the 'urban greenways' both as wildlife corridors and as habitats in their own right. The results suggest that cities provide habitats for rich and diverse range of plants and animals, which occur sometimes in unlikely recombinant communities. The studies on carabids and butterflies illustrated the relative importance of habitat quality on individual sites as opposed to site location within the conurbation. This suggests that dispersal for most of our urban species is not a limiting factor in population persistence, although elements of the woodland carabid fauna did appear to have some geographical structuring. Theoretical models suggested that dormice and water voles may depend on linear habitats for dispersal. The models also indicated that other groups, such as small and medium sized mammals, may use corridors, although field-based research did not provide any evidence to suggest that plants or invertebrates use urban greenways for dispersal. This finding indicates the importance of identifying a target species or group of species for urban greenways intended as dispersal routeways rather than as habitat in their own right. Their importance for most groups is rather that greenways provide a chain of different habitats permeating the urban environment. We suggest that planners can have a positive impact on urban biodiversity by slowing the pace of redevelopment and by not hurrying to tidy up and redevelop brownfield sites.