东北地区泥炭微量元素的研究

研究了我国东北地区草本泥炭、泥炭藓泥炭和草本－木本泥炭中微量的储存量及其分布特点，并分析了泥炭形成的地域特点和泥炭的理化性质，从而提出了泥炭类型、物质组成和理化特性是影响泥炭中微量元素的主要因素，测试结果表明，泥炭中微量元素含量为陆相沉积泥炭小于海相沉积泥炭；泥炭藓泥炭低于草本泥炭和木本－草本泥炭。     

水位和竞争对三种泥炭藓生长的影响

以丘间种喙叶泥炭藓(Sphagnum fallax)和丘上种尖叶泥炭藓(S.capillifolium)与大泥炭藓(S.palustre)为材料,研究水位和竞争对泥炭地3种苔藓植物生长的影响.在单种群中,增加水位仅对尖叶泥炭藓生长不利,喙叶泥炭藓和大泥炭藓的高度生长和水平扩展均随水位增加而增加.在混合群中,喙叶泥炭藓的高度生长与盖度扩展主要受水位影响,邻体均未抑制其盖度增长,随着水位增高其盖度逐渐增大;水位影响大泥炭藓的高度生长,两种邻体均导致其盖度降低;除能降低大泥炭藓盖度外,尖叶泥炭藓对邻体和水位均无响应.由此反映出3种苔藓植物存在较为清晰的竞争等级:喙叶泥炭藓竞争能力强于两种丘上种,尖叶泥炭藓次之,大泥炭藓最弱.     

泥炭植物残体分解速率的研究

研究了实验室条件和野外条件下泥炭植物残体的分解速率，探讨了植物残体分解过程中主要的影响因素，结果表明，在水分５０％，温度为３０℃，弱碱性的实验条件下，泥炭植物残体分解得最快；不同的植物残体分解速度不同，灰藓分解得最快，其次是芦苇，针叶松，赤杨和棉花莎草，泥炭藓残体分解得最慢。     

关于高位泥炭形成时代的研究

以泥炭藓植物残体为主的高位泥炭，是古气候研究的重要佐证。其形成与湿润气候期密切相关。利用＾１４Ｃ测年及古气候研究的有关结果，对中国东北与白俄罗斯高位泥炭的形成特点进行了多方面研究，划分出几个重要的形成时期和阶段；探讨了它与全气候期以及几次重要气候事件的关系。     

中国泥炭藓属植物研究进展

以CNKI中国知网信息资源总库为检索源,以"苔藓""泥炭藓""进展"等关键词为检索条件,自1987年至今,共检索了76篇相关资料。经整理、归纳、总结,得出:我国泥炭藓属植物在生理学上的研究主要集中在影响其变化的非生物因子方面,而对发生变化的机理研究较少;目前泥炭藓属植物生态学功能的研究重点是涵水能力及与全球碳氮循环的关系;泥炭藓的化学内含物的应用还有待进一步的研究;泥炭藓的超微结构研究有待开发。此外,我国野生的泥炭藓属植物资源面临严峻的挑战,必须尽快采取有效措施加以保护。     

天宝岩不同类型泥炭沼泽物种多样性与地上生物量关系

以天宝岩国家级自然保护区为研究对象,研究4种不同类型泥炭沼泽群落生物量、物种多样性分布特征以及地上生物量与物种多样性间的关系.结果表明:泥炭藓群落(Comm.Sphagnum magellanicum)地上生物量和泥炭藓生物量均显著高于其他3类群落(P0.05),其他3类群落地上生物量和泥炭藓生物量无显著差异(P0.05),其中水竹-泥炭藓群落(Comm.Phyllostachys heteroclada-Sphagnum magellanicum)的地上生物量最低.不同泥炭沼泽类型群落物种多样性排序为垂穗石松+水竹-泥炭藓群落(Comm.Palhinhaea cernua+Phyllostachys heteroclada-Sphagnum magellanicum)灯芯草-泥炭藓群落(Comm.Juncus effusu-Sphagnum magellanicum)水竹-泥炭藓群落泥炭藓群落.相关分析表明:天宝岩不同类型泥炭藓沼泽群落物种多样性与地上生物量关系不明显,基本无相关性(r≈0).亚热带泥炭藓沼泽湿地生物量主要由优势物种决定,而物种多样性则主要由非优势物种决定.长期水淹加上高寒气候造成资源环境空间异质性降低,"生态位互补"效应不明显.     

神农架大九湖湿地泥炭藓遗传多样性RAPD研究

泥炭藓是重要的沼泽湿生藓类,其生长情况对环境气候变迁具有直接的指示意义.通过RAPD分子标记对湖北神农架47份泥炭藓样品的遗传多样性进行了研究:(1)对20条随机引物进行筛选,共选出6条重复性好,条带清晰的引物,对47份样品共扩增出40个条带,多态性比率为95%;(2)以遗传相似性系数0.61为界限,可将47份样品划分为4大类群;(3)对泥炭藓扩增条带的聚类分析显示,大九湖湿地泥炭藓遗传多样性与采样点地域之间没有明显的相关性.对上述结果综合分析表明:大九湖湿地泥炭藓遗传多样性水平较低,一定程度上反映出近些年来旅游开发、排水工程改造等人类活动对大九湖湿地自然环境的影响.     

基于GIS的中国泥炭资源性质评价

泥炭是一种重要的自然资源，在农业、工业和医药业等方面具有多种用途,泥炭中有机质古量对泥炭的利用起着至关重要的作用．采用GIS技术，对我国泥炭资源的有机质的类型、古量及分布状况进行分析,既能满足泥炭资源信息咨询的需要，又有利于泥炭资源的现代化管理.     

泥炭及其腐殖酸类物质栽培食用菌的研究

重点阐述了一级菌种的培养、二三级菌种扩培以及菌砖制作和管理。在一级斜面培养基中加入１ｍＬ，，腐殖酸钠（体积百分比浓度为４×１０－４），菌丝长势最佳。在二三级菌种培养基中加入３０％泥炭藓泥炭或草本泥炭以及定量的腐钠，菌丝布满料层时间最短，且菌丝长势旺盛。在菌砖中泥炭加入量以３０％为宜，鲜菇产量最多，生物转化率最高。泥炭和腐钠在食用菌栽培过程中，对改善二三级培养基和菌砖的水、肥、气、热状况，以及增强微生物体内氧化酶的活性，对促进食用菌的长势，具有良好的作用。     

鄂西二仙岩泥炭藓沼泽一草甸交错带植物群落的β多样性研究

应用二元属性数据和数量数据对二仙岩泥炭藓沼泽一草甸交错带植被的β多样性进行了初步研究,在5个样地的25个样方内共记录25种高等植物.二元属性测度的口多样性与数量数据测度的β多样性所得结果相似:沿二仙岩草甸向泥炭藓沼泽内部逐渐过渡时,β多样性呈现递减的趋势,物种替代的速率逐渐减小,群落逐渐趋于稳定.该结果反映了泥炭藓沼泽由外部草甸向沼泽内部延伸植物群落所受人为活动的影响逐渐减小.     

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.     

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     

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

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