影响园林苗木移栽成活率的因素及对策

随着我国城市建设的步伐日益加快,许多环境建设和城市绿化工程都需要"一次成园"或者"短期成景",因而提高园林绿化苗木(尤其是大规格苗木)的移栽成活率就显得非常重要,本文阐述了影响园林苗木移裁成活率的因素,并探讨了提高移栽成活率的方法。     

试论反季节树木移植技术

为提高反季节树木的移植成活率,文章针对移植过程中移植树木的选择、起苗、苗木的修剪、苗木运输以及移植树木的栽植、栽后管理等方面的技术要点进行了介绍。     

浅谈苗木移植技术在园林绿化中的应用

苗木移植技术在生物教学、苗圃栽培以及林业、园林绿化行业中是必须掌握的一项专业技术,这项技术的掌握及运用往往直接影响植物移植后的成活率,这在园林工作中尤为重要。每一株长势良好的花木,从苗圃进城后,其命运如何,有很多因素制约,譬如土壤、水分、光线、气候、灌溉、管理养护。但第一步是移植,移植也是决定苗木成活率最关键的环节。苗木移植中有几个问题应该注意：移植的时间符合植物生长发育规律;树种的选择要把好苗木质量关;起苗方法得当;包装和运输不能松懈;栽植过程要符合技术要求;养护管理要跟得上。     

浅谈城市园林绿化中提高大树移植成活率的主要技术措施

随着我国城市化进程的加快,因开发用地和旧城改造等建设项目施工,以及为尽快营造良好的植物景观效果等需要,大树的保护性移植和园林景观需要的栽植越来越普遍。就上海而言,每年当地移植大规格乔灌木和引进外来的用于园林绿化的各种大规格观赏树木呈逐年上升趋势;据资料统计全国各省会城市用于城市绿化的各种规格观赏树木总量中,栽植大规格树木(大树)的数量逐年增加,但总体而言,移植、栽植大树的成活率却令人堪忧。如何提高大树移植成活率已逐渐受到园林行业内人士和各地园林部门的高度重视,也引起各级政府的深切关注。下面笔者就结合二十年来的园林工作实践,探讨一下提高大树移植成活率的主要技术措施。     

苗木移植技术在园林绿化施工中的运用

苗木移植技术是一项专业技术,需要苗圃栽培、生物教学、园林绿化等行业中所必须掌握的。在园林工作中尤为重要,因为这项技术的掌握及运用直接影响植物移植后的成活率,这本文首先总结了苗木移植成活的基本原理,然后重点介绍了苗木移植的主要施工技术。     

古树移植技术分析

保证大树或者古树移植成活率的关键是掌握大树移植技术，其技术主要包括大树假植技术和移栽定植技术。文章就此进行了阐述和分析。     

浅谈大树免修剪移植技术在施工中的应用

中国房地产事业的欣欣向荣带动了园林行业不断向多元化、精品化发展,高品质的园林设计被要求种植全冠苗木。然而传统的移植技术已经无法保证苗木全冠移植的成活率。因此大树免修剪移植技术这种新型移植技术应运而生。通过应用这项新技术,在大树基本保持全枝的情况下也能达到近100%的成活率,产生了巨大的经济效益和环境效益。     

山丹县城市园林绿化工程中大树移栽技术初探

随着城市建设步伐的加快,在城市园林绿化工程施工中,经常需要移栽园林大树,若采用的措施不当,被移栽的树木难以成活。以甘肃省山丹县城市园林绿化工程具体实践为例,科学分析了大树移栽成活困难的原因,就如何提高园林绿化工程中大树移栽成活率,从移植前的准备、移植过程和移植后的养护管理提出了几点有效的方法和措施。     

拉萨河谷5种乡土树种晾晒后对根系活力及光合日进程的影响

基于拉萨河谷造林成活率低下的现状,分析了苗木水分状况对苗木活力的影响,为苗木保护及提高造林成活率提供科学依据.以5种乡土树种藏川杨(Populus szechuanica var.tibetica)、银白杨(P.alba var.alba)、细叶红柳(S.microsiachya)、左旋柳(S.paraplesia var.subintegra)、江孜沙棘(Hippophae gyantsensis)为研究对象,对其苗木进行不同时间的晾晒处理,测定苗木移植后的生长活力与光合日进程,晾晒时间分别设为0,2,4,6,8h.苗木活力、光合能力与苗木水分密切相关,随着晾晒时间的延长,移栽后根系活力、树高生长量、光合能力随之下降,最终导致苗木成活率降低.藏川杨的晾晒极限时间为4h,银白杨、细叶红柳、左旋柳均为6h,江孜沙棘的晾晒极限时间最长为8h.苗木起苗后的保护工作,尤其是在拉萨半干旱河谷对根系的保护至关重要,这对于维持苗木活力,提高本地区造林成活率和保存率有重要意义.     

植树造林要把好六大关

一、把好苗木质量关 苗木质量的优劣,直接影响栽植成活率,常绿树表现更明显。以棕榈为例:健壮的棕榈苗,根系发达、棕厚、叶肥色深绿、叶柄较短,定植成活率一般可达95％以上。而弱棕榈苗在相同的条件下定植,成活率最高只达75％,且成活后长     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with