Erythrina brucei: Propagation attributes, leaf nutrient concentration and impact on barley grain yield

Erythrina brucei Schweinf. emend. Gillett (Papilionaceae),a tree species that is endemic to Ethiopia, is known to possess useful agroforestry attributes, but these attributes have not been quantified. To achieve this, propagation of the species, growth rate of young trees and their impact on barley (Hordeum vulgare L.), and leaf-nutrient concentrations were examined. Germination of seeds planted in plastic pots varied from 73 to 93%, and direct seeding in the field yielded 83%germination. Branch cuttings obtained from 2 to 3-year-old stock plants (n =150) resulted in 70 to 80% rooting within 8 to 12 weeks after setting cuttings into the rooting medium. Considerable nodulation occurred on leaves one year after planting out seedlings and stecklings. Leaf concentrations of Mg, N,P, and S were significantly lower in nodulated than in the non-nodulated leaves. On the other hand, leaf Fe concentration was higher in nodulated than in the non-nodulated leaves. There was no significant difference in Ca and K contentsbetween the nodulated and non-nodulated leaves. E. brucei-treatment significantly increased tiller and seed numbers, as well as seed weight. However, thousand-grain weight and grain size were similar in harvests from E. brucei-treated and the control plots. The results indicate that the species is easy to propagate by seed and vegetative means, grows fast, is desirable for intercropping, and has relatively high leaf-nutrient concentration.This revised version was published online in November 2005 with corrections to the Cover Date.     

实施龙顶名牌战略推进茶叶产业化进程

分析了开化龙顶茶叶生产的环境。土地资源和生产，销售现状以及存在的问题，提出了产业化发展战略和实施对策与措施。     

城市林业概述与发展趋势

随着社会经济的快速发展和城市化进程的加快,城市环境问题日益成为社会各界和学术界关注的焦点,城市林业在城市建设与发展中的地位和作用越来越受到重视。介绍城市林业的基本概念和内涵,比较城市林业与传统林业在属性、经营管理和功能方面的差别。借助已有的研究数据和成果,阐述城市林业在城市发展中的作用及其能解决的问题。针对城市林业发展的现状和存在的问题,提出现代城市林业面临的机遇和挑战以及未来发展趋势。     

中国古典园林中的"收"与"放"分析

中国人对于“人要征服自然”和“人是自然的一部分”的辩证统一关系的认识和态度,是中国古典园林形成的哲学依据。该文通过对中国古典造园的思想背景、总体布局、空间组织、园林建筑、掇山理水、植物配置等造景元素中“收”与“放”的分析,阐明了“收”与“放”的对比与联系在古典园林中所产生的社会效果和审美效果：     

中日传统家具的用材文化比较

中日传统家具由于受不同的社会因素的影响,形成了各自不同的选材原则。在传统家具的用材方面,中国传统家具表现出一种独具特色的"硬木"文化情结,而日本传统家具则表现出一种"轻材质重工艺"的审美意趣。日本传统家具在选材与用材方面的审美意识应成为中国对日出口家具企业进行原材料选择、成本分析与产品设计定位的依据。     

南瓜茶饮料不同风味加工技术研究

研究了以南瓜为原料，经热水2次浸提（1kg南瓜：4000ml水）所得南瓜母液，每100ml母液添加14g白沙糖、0.18g柠檬酸的甜酸型南瓜茶饮料和每100ml母液添加14g白砂糖、0.2g柠檬酸、0.09g食用盐配方而成的复合风味南瓜茶饮料的生产技术。     

Integrating traditional and local ecological knowledge into forest biodiversity conservation in the Pacific Northwest

The potential for traditional and local ecological knowledge to contribute to biodiversity conservation has been widely recognized, but the actual application of this knowledge to biodiversity conservation is not easy. This paper synthesizes literature about traditional and local ecological knowledge and forest management in the Pacific Northwest to evaluate what is needed to accomplish this goal. We address three topics: (1) views and values people have relating to biodiversity; (2) the resource use and management practices of local forest users, and their effects on biodiversity; (3) models for integrating traditional and local ecological knowledge into biodiversity conservation on public and private lands. We focus on the ecological knowledge of forest users belonging to three groups who inhabit the region: American Indians, family forest owners, and commercial nontimber forest product harvesters.     

影响勉县无性系茶苗移栽成活因素及栽培管理技术

根据陕西省勉县的气候特点和多年来指导无性系茶园建设的经验,总结分析了影响勉县无性系茶苗移栽成活的主要因素,并提出了在无性系茶园建设中提高茶苗移栽成活率应注意的技术细节问题。     

不同控草措施对都匀毛尖茶产量及品质的影响

为研究覆盖稻草和地膜对都匀毛尖茶原产地茶团山种老茶园杂草控制效果,开展了不同控草措施对都匀毛尖茶产量及品质的影响试验。结果表明,稻草覆盖和地膜覆盖处理春季茶芽密度、茶芽重、产量及茶叶色、香、味、形等外形感官评审分数均高于清耕对照,茶叶中水浸出物、茶多酚、氨基酸、咖啡碱、可溶性糖、黄酮类含量均高于清耕对照。稻草覆盖和地膜覆盖可有效控制杂草生长,提高茶叶产量和改善茶叶品质。     

基于江苏茶园施肥及空间分布特性分析江苏茶园可持续发展

【目的】茶树是一种多年生作物,现已成为我国乡村致富的重要产业,为了掌握江苏茶园土壤养分现状及施肥方式对茶园养分环境的影响分析。【方法】通过对江苏省主产茶128个茶园施肥方式进行调研,测定其有机质、pH值、碱解氮、速效磷、全钾以及钙、镁等微量元素及部分重金属物质含量,同时对经纬度和不同茶园营养元素之间的相关性进行分析。【结果】江苏茶园pH值介于3.82～6.14之间,有机质含量介于11.10～29.4g/kg之间,碱解氮含量介于42.23～119.45mg/kg之间;速效磷含量介于13.75～289.71mg/kg之间;全钾含量介于53.61～79.35g/kg之间;有机质含量与取样点经纬度均存在显著相关关系(相关系数分别为0.7430和-6910),同时土壤全钾含量与取样点经度均存在显著负相关关系(r=-0.820),与取样点纬度存在显著正相关关系(r=0.6992),有机质含量与碱解氮和速效磷含量显著正相关(r=0.8319和r=0.6681),与速效钾含量间存在显著负相关关系(r=-0.9093);土壤pH值和镍元素之间存在极显著正相关关系(r=0.9049)。【结论】尿素的大量施用是导致江苏茶园土壤酸化严重的重要原因,总体而言,江苏茶园土壤总体肥力较好,部分茶园存在酸化现象,茶园有机质含量越高,碱解氮和有效磷含量越高,有效钾含量越低。施肥习惯应结合有机肥(菜籽饼)与尿素相结合的方式,并注意土壤改良剂的应用和尿素的施用,更有利于茶园营养物质的可持续利用和高质量发展。