金叶假连翘叶斑病发病规律及防治技术研究

金叶假连翘(Duranta repens)是新近应用最多的金叶、金果类园林绿化植物。近年来，叶斑病发生相当严重，造成大量落叶落花，既影响生长，又影响美观。研究病害的症状、病原菌特征、发病特点，提出了有效的防治技术。     

青杨天牛发生特点及环境友好型控制策略探讨

在回顾国内外研究进展的基础上,总结了青杨天牛的发生特点,并提出了控制青杨天牛的环境友好型策略。青杨天牛的发生具有分布广、危害重,对黑青杨派危害重,对白杨派危害轻,对幼树危害重,老树轻,对纯林危害重,混交林轻等特点。根据防治青杨天牛措施对环境的作用,将其划分为环境有益、环境兼容和环境有害3个等级。     

英国花园发展浅析

英国花园在欧洲园林中极具影响力。本文对中世纪时期到爱德华七世时代等六个时期英国私家花园的历史背景、功能特点、设计风格及常用植物种类进行了介绍和分析,为我国日益兴起的别墅庭院及私人庭院设计提供借鉴。     

叶面肥的种类与发展趋势探析

具体阐述了叶面肥的主要特点,并分析了当前叶面肥应用上存在的问题与其发展趋势及前景,以期促进叶面肥的应用与推广。     

浅析冷铺沥青材料的特性、配制及应用

储存式冷铺沥青混合料,是指平时储存在仓库内,使用对在常温下进行摊铺和压实的材料.文章着重介绍了这种冷铺沥青材料的特性、配制原理及应用技术要求.     

Analysis of root fractal characteristics in remote areas of the Taklimakan desert, China

Fractal geometry is a potential new approach to analyze the root architecture, which may offer improved ways to quantify and summarize root system complexity as well as yield ecological and physiological insights into the functional relevance of specific architectural patterns. Fractal analysis is a sensitive measure of root branching intensity and fractal dimension expresses the ＂space filling＂ properties of a structure. The objective of this study was to find out the fractal characteristics of root systems in a remote area of the Taklimakan desert in China. The entire root system of two naturally occurring species were excavated and exposed with shov- els in 2007. The species were Tamarix taklamakanensis and Calligonum roborovskii. A one-factorial ANOVA with species as factor showed statistically a highly significant difference in fractal dimensions, indicating differences in their pattern of root branching. There was no relationship between root diameter and two parameters of fractal root models a and q, representing general characteris- tics of root systems, for either species （a： the ratio of the sum of root cross-sectional areas after a branching to the cross-sectional area before root division; q： the distribution of the cross-sectional areas after branching）. We have found significant linear relation- ships between the diameter after branching and root length and biomass respectively, because of the self-similarity of root branching. Branching rules are the same for roots of all sizes and lengths. Root biomass for the root systems of entire trees can be estimated by measuring the diameter of each root at the base of the trunk or the diameter after branching. We have shown that the diameter of each root at the base of the trunk and the diameter after branching are effective indices that can be measured easily in order to estimate the root lengths, biomass and other parameters of root architecture.     

元江芒果花瘿纹的为害特点及其防治

芒果花瘿纹是危害芒果花序和幼果的主要害虫。通过对元江芒果花期花瘿纹两年的系统观察,掌握了花瘿蚊完整的生活史。该虫在元江１年发生６～７代,成虫成芒果的花芽或花苗上产卵,孵化幼虫在花蕾内蛀食危害。以２月初出现的第２代和２月中、下旬出现的第３代为主要为害代。据不同药剂防治试验结果,大田上用４０％速扑杀和２４％万灵各１０００倍药液喷撒防治,防治效果达７５％以上,可有效控制花瘿纹的发生,花期连续喷撒３～４次     

吉林省森林病虫害发生特点及防治对策

本文对吉林省森林病虫害发生特点进行了分析，提出了今后森林病虫害的防治对策。     

浙江省木家具产业概况及产品质量分析

为保障木家具产品质量,促进家具行业健康发展,对浙江省木家具产业概况及产品质量进行分析,并归纳木家具产品存在的主要质量问题,着重分析木工要求、力学性能及理化性能、家具使用说明书、甲醛释放量、尺寸及外观要求等质量问题的产生原因。综合浙江省木家具产业的发展特点,提出改进建议。     

间作模式下桑树与大豆叶片的光合日变化特点

为了提高桑树与大豆间作模式下地上部分的光能利用率,优化桑树与大豆复合经营的空间配置,研究了在这一间作模式下生育后期速生桑树和大豆叶片的光合日变化特点.结果表明:无论在单作还是间作模式下大豆叶片在13:00时均表现出明显的光合"午休"现象,其光合性能并未因间作桑树而受到影响;一天之中,桑树叶片分别在9:00时和13:00时出现光抑制现象,并且13:00时光抑制的程度和持续的时间均大于9:00时出现的,不同种植模式下桑树叶片的光合日变化情况存在着明显的差异,一天之中,间作模式下桑树叶片的P_r、_r、和F_v /F_m等光合指标值均优于单作模式的桑树叶片,桑树与大豆间作具有一定程度的种间促进作用,1年生桑树幼苗与大豆间作能明显提高生育后期速生桑树叶片的光合生产能力,从而可实现高产的目的.