不同处理措施对五角枫黄叶病症治理的影响

五角枫对栽植环境要求较高,极易受土传真菌的侵染,导致出现非自然状态下突然黄叶甚至干枯死亡的现象。从五角枫的栽植环境入手,分析了五角枫树势变弱的因素,阐述了五角枫黄叶症状发生后应采取的一些技术措施,以期为优化五角枫的栽植方法、降低黄叶病的危害提供借鉴。     

不同种槭树过氧化物酶同工酶分析

用聚丙烯酰胺凝胶电泳测定复叶槭、平基槭、五角枫的过氧化物酶同工酶,明确了其酶谱的特征及分布,并通过排序分析方法分析其相互之间的亲缘关系,结果表明：五角枫与平基槭的亲缘关系较近,而复叶槭与上述两种的亲缘关系较远。从酶带的数量和染色深浅可发现在三种供试材料中,五角枫的抗性及适应性都比较强。     

五角枫育苗技术

五角枫是小陇山林区的乡土树种,木材材质坚韧,质地细致,可制作家具和用作建筑。在苗木生产中,从种实采集、处理、播种育苗和幼苗田间管理等几个方面,总结了五角枫壮苗培育技术。     

石质丘陵造林辅助措施优化分析

以五角枫、火炬树为材料,运用3因素5水平二次正交旋转组合试验设计方法,研究了石质丘陵春季造林中,保水剂、ABT生根粉和基肥3项造林辅助措施对造林成活率和新植幼树生长量的综合作用。结果表明：保水剂、ABT对2个树种造林成活率的促进作用分别达到极显著和显著水平;施用基肥虽然对2个树种造林成活率有显著的不利影响,但对成活后的2个树种幼树生长量都有极显著的促进作用;保水剂、ABT生根剂对五角枫的新梢生长量有显著的促进作用,对火炬树高生长影响则不显著。综合成活率和幼树生长2个目标,经计算机模拟优化得出:保水剂的推荐用量,火炬树为36.8~39.9 g/株,五角枫为35.1~39.2 g/株;生根剂的推荐使用量,火炬树为31~53.7 mg/kg,五角枫为41.9~60.1 mg/kg;基肥则以不用为宜。     

试论太原市抗逆性苗木的选用与栽植

立足近年来日趋突出的生态环境问题,分析了抗逆性苗木在改善环境污染方面的重要意义,详细介绍了抗逆性苗木的选用方法和科学栽植方式,并对未来抗逆性苗木应用的发展趋势进行了展望。     

宾县西部、北部半山区和平原区混交林栽植模式

文章根据黑龙江省宾县的立地条件特征,本着适地适树,科学配置的原则,指出了采用针阔混交、乔灌混交方式营造混交林的栽植模式,并对这个的技术要点和配套措施进行了详细论述。     

兰州地区树木非移植期栽植技术与管理

兰州地区树木非移植期栽植技术与管理甘肃省林业科学研究所李茂哉随着现代化城市建设的发展，人们对环境绿化有了更高的追求，许多单位在搞完基建工程后便开始进行绿化工作，此时已错过了树木正常栽植季节，而绿化工作要求必须当年完成，这就给绿化施工单位带来很多意想不...     

四种阔叶树叶片解剖结构特征及其耐旱性比较研究

以泰山学院4种常见阔叶树五角枫、皂荚、黄栌、木槿等为研究对象,对各种类叶片的主要解剖构造特征进行观察和测定,并综合分析它们在控制水分上的能力.结果表明,不同树种控制水分的主要解剖特征各异;应用模糊数学分析,选择角质层厚度、栅/海比值、上、下表皮厚度、气孔的长度等5个指标进行综合评价,4种阔叶树叶片解剖构造在耐旱性上的能力大小排序为：五角枫〉木槿〉皂荚〉黄栌.     

人工造林基本技术措施

本文论述了人工造林的基本技术措施。从树种的选择,造林密度与结构、苗木保护与处理到科学栽植与管理进行了简要介绍。     

专业化山地商品果园建园技术的探讨

探讨了专业化山地商品果园建园技术,即建园前先进行深入细致的调查研究和园地勘测,然后再进行科学的规划设计,根据设计要求进行施工,从而进行合理地栽植。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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