崂山绿茶加工技术

介绍了青岛地区崂山绿茶的加工技术,包括摊放、杀青、揉捻、干燥等详细过程。     

北京市居住区绿地植物组成及其物种多样性研究

为探讨北京市五环内居住区绿地植物种类、结构以及植物群落特性,於2005年5～8月进行机械布点,共调查乔木样方180个,灌木样方200个,草本样方1 095个.结果表明:①北京市居住区共有维管束植物68科178属273种.②从市中心到五环梯度群落物种多样性特征为:物种丰富度草本层＞灌木层＞乔木层;均匀度乔木层、灌木层＞草本层;多样性指数灌木层、草本层＞乔木层.③绿地结构类型中,乔灌草交互组成的复层结构占优势.     

城市绿地系统研究展望

城市绿地作为城市生态系统的重要组成，在改善城市生存环境和维持生态平衡方面发挥着重要作用。在概述城市绿地概念及其组成、分类、功能等基础上，高度总结了现代城市绿地、绿地评价、园林绿化、园林植物、园林学科等领域的研究进展。最后，重点概括了城市园林绿地研究的发展方向。     

城市园林绿化质量可拓综合评判方法研究

为客观、准确地对城市园林绿化质量进行评判,依据国际花园城市标准、国家生态园林城市标准、国家园林城市标准、城市绿化规划建设指标规定和部分省级园林城市标准,筛选了建城区绿化覆盖率、建城区绿地率、建城区人均公共绿地面积三大指标为园林绿化质量的评判特征因子。在此基础上,引入可拓学理论,建立了城市园林绿化质量评判物元模型,给出了基于关联函数的可拓评判方法。并结合某城市园林绿化现状,实际评判了其质量综合水平状况。     

上海新建绿地的土壤质量现状和对策

对上海新建的18块绿地319个土壤样品的调查分析显示，上海新建城市绿地土壤质量存在以下一些共性：pH呈碱性或强碱性；电导率（EC值）和有机质含量偏低；土壤密度偏高，42．45％的土壤大于1．35Mg·m^-3；土壤通气性差，83．2％的土壤通气孔隙度〈5％；土壤阳离子含量适中，其中水解性氮和有效磷含量低，但速效钾含量适中；土壤质地基本为壤质土。土壤质量是限制上海新建城市绿地植物生长和生态景观效果发挥的主要限制因子之一，针对上海城市土壤存在问题，建议从城市土壤标准建立、采样方法、测试方法、植物营养平衡、土壤安全性、土壤改良与废弃物利用、管理对策等几个方面提高城市绿地的土壤质量。     

Social and Ecnomic Values of Urban Forestry：Malaysian Perspective

1 INTRODUCTIONUrban forestry means different things to differentpeople, depending on one’s perspective. Some peopleview urban forestry in terms of economic values,rather than cultural or social values, whereas othersmay perceive it in terms of all three types of values.As such, the management of urban green spaces maybe tailored to suchvalues. To Kuchelmeisterand TREECITY (1998), urban greening and urban forestry aretwo different fields altogether. They referred to urbangreening as t…     

对住宅建设的一点看法

本文着重从几个方面论述住宅建设今后的发展方向。使住宅总体规划合理,经济适用,住宅建设与环境协调,达到可持续发展原则的绿色住宅和生态住宅区。     

郑州市绿地景观多样性研究

介绍了景观生态学理论中景观多样性的分析方法理论，并在调查的基础上，首次对郑州市绿地系统景观多样性相关指数进行了计算、分析和评价。研究表明，郑州城市绿地系统绿地景观多样性指数为2．08，与理论最大值相差0．5，说明绿地类型面积分布不够均匀，存在一定的改善空间。分城区研究表明，二七区的绿地景观中不同程度地受到某一种类型的控制，绿地景观类型面积分布很不平衡；新建城区存在绿地类型不全，绿地系统生态功能不能很好实现，应建设更多绿地类型。     

Composition of pyrolyzate from Japanese green tea

Green tea is a beverage that is produced by hot-water extraction of the leaves of tea (Camellia sinensis L.). As the amount of green tea consumption has increased, the importance of using the residue has grown. To address this problem, chemical compositions of two pyrolyzates obtained with an electric kiln, L and G, which were obtained from the tea leaf product and its hot-water extraction residue, respectively, were examined. Both pyrolyzates were alkaline, in contrast to the acidic pHs that are typical of pyrolyzates from wood materials. The major constituents were nitrogen-containing compounds, which accounted for up to about 70% (based on gas chromatography-mass spectrometry peak area). Caffeine was the main compound in both samples, although it might not be a pyrolysis product but actually sublimates from the samples and then condenses back into the pyrolyzates. Other nitrogen-containing compounds were formed mainly from proteins and amino acids. Acids and phenols, which are typical components in pyrolyzates obtained from wood materials and contribute to acidic pH, were rare in both samples. Other neutral compounds are known as compounds in pyrolyzates from wood materials. The pyrolyzates obtained in this experiment were novel and may have new uses.Contents of this report was presented in the 52nd Annual Meeting of the Japan Wood Research Society, Gifu, 2002     

Nitrogen mineralization patterns of leaf-twig mixtures from tropical leguminous trees

Green manure applications in alley cropping systems often include twigs despite their potential to absorb (immobilize) nitrogen (N). To assess the impact of twigs on net N mineralization or immobilization from hedge row cuttings, we separated cuttings fromCalliandra calothyrsus andGliricidia sepium into leaf-only, twig-only, and mixed (leaf + twig) fractions and incubated them with moist soil in the laboratory. Soil extractable inorganic N did no differ among treatments after two weeks, but after four and eight weeks was greatest in leaf-only, and least in twig-only treatments. After two weeks, extractable N from the leaf-only treatment rose steadily, while that from the twig-only and mixed treatments was variable due to periods of net mineralization and net immobilization. The pattern of variation in mixed treatments paralleled that of twig-only, indicating that net immobilization in the mixture was largely caused by the presence of twigs. Extractable N from the mixture was somewhat lower than that predicted from the sum of leaf-only and twig-only treatments. We conclude that twigs in green manure reduce short-term N availability to associated crops in agroforestry systems.