天津地区鸟类组成及多样性分析

2002-2005年,采用样点和样线法对天津地区的鸟类组成及多样性进行调查.共记录到鸟类389种,隶属19目68科184属.鸟类区系以古北种类最多,203种,占总种数的52.19%;东洋种42种(10.79%)和广布种144(37.02%).居留型以旅鸟最多,234种(60.15%);夏候鸟次之,74种(19.02%);留鸟55种(14.14%);冬候鸟最少,仅26种(6.68%).基于G-F多样性指数对天津鸟类多样性进行分析,结果显示,湿地水域鸟类多样性稍高,为0.76,居民点及城市公园最低,为0.58,山地和平原田野均为0.75,表明天津地区鸟类的组成及多样性分布与其环境相关.     

城市公园夏季鸟类的群落结构

综合1997年至2003年的调查数据,对长春市南湖公园鸟类群落组成、群落结构做了调查研究,共统计夏季鸟类52种,隶属9目23科.5个群落中,夏季鸟类多样性指数、均匀性指数以阔叶林最高(H′=3.980,J=0.786),5个群落中鸟类均以动物食性为主,消费生物量以疏林罐丛最低(75.21g/10hm2).人为活动对夏季鸟类分布有直接影响.     

庆安县中低产田改良现状及其对策

庆安县地处松嫩平原东部,小兴安岭余脉的西部边缘呼兰河中游的平原上.由南北向中间高低相间形成了侵蚀山地,侵蚀堆积台地,堆积河谷平原三种地貌类型,土壤随地形,从侵蚀山地、侵蚀堆积台地到堆积河谷平原呈有规律性的分布着暗棕壤,白浆土及黑土等八大类地带性土壤,并在这些地带性土壤中分布着草甸土、沼泽土、泥炭土等非地带性土壤.     

次生阔叶林猛禽的群落结构及其季节变化

猛禽是鸟类中的一个重要类群，在森林鸟类群落中起着重要的作用，构成了自身的群落特点。在吉林省东部左家自然保护区山地次生阔叶林的研究中发现，无论是冬季，还是夏季，猛禽的群落均具有其稳定性；同一季节各年份间，无论从种类、种数、个体数量等均没有显著差异，而一年的不同季节间有显著差异。从整体看，夏季猛禽群落的多样性指数（Ｈ）高于冬季，但差异不大；均匀性指数（Ｊ）和种间相遇几率（ＰＩＥ），在年份和季节上均无显     

动物标本室鸟类标本的名录与整理

华南师范大学动物标本室共有鸟类标本816号,260种,隶属于20个目、55个科.拥有金雕、红腹锦鸡、灰孔雀雉、丹顶鹤、原鸡等44种国家重点保护鸟类.该文详细地介绍标本室的鸟类名录和44种珍稀濒危鸟类的分布及其保护等级,以及一些标本整理过程的工作情况等.     

京冀太行山优先保护区域受胁鸟类多样性与分布特征

通过样线法实地调查和查阅历史文献分析,对京冀太行山优先保护区域的受胁鸟类多样性和分布特征进行了研究.实地调查时间为2019年7月-2020年5月,于春季、夏季、秋季和冬季共进行了4次调查.研究结果显示,京冀太行山区域受胁鸟类共计19种,占全国受胁鸟类物种的11.87%.其中：极度濒危物种1种,占全国的5.26%;濒危物种10种,占全国的20.00%;易危物种8种,占全国的8.60%.京冀太行山优先保护区域是黑鹳（Ciconia nigra）、褐马鸡（Crossoptilon mantchuricum）及多种猛禽等受胁鸟类的重要栖息地,其中：黑鹳和猛禽在该区域分布范围较广,潜在适宜栖息地面积较大;而褐马鸡分布区域相对较小,主要分布在北京西部及河北小五台和驼梁2个国家级自然保护区内.受胁猛禽偏向于在中、高海拔开阔的山地环境活动,主要沿着山脊分布.     

中国雉科鸟类特有种分布的研究

我国现有雉科鸟类特有种20种,约占我国现有雉科鸟类总种数56种的35．7％．通过对我国雉科鸟类特有种的地理分布情况及有关分布资料的收集、整理,研究了中国雉科鸟类特有种的多样性及其分布．我国雉科鸟类特有种在水平分布上具有不均匀的特点,西南山地亚区、青海藏南亚区、西部山地高原亚区的雉科鸟类特有种丰富度明显高于其他亚区,其雉科鸟类特有种数量分别为9、6和6种,同时还有不少种类是局限性分布和间断性分布,     

中国雉科鸟类特有种分布的研究

我国现有雉科鸟类特有种20种,约占我国现有雉科鸟类总种数56种的35．7％．通过对我国雉科鸟类特有种的地理分布情况及有关分布资料的收集、整理,研究了中国雉科鸟类特有种的多样性及其分布．我国雉科鸟类特有种在水平分布上具有不均匀的特点,西南山地亚区、青海藏南亚区、西部山地高原亚区的雉科鸟类特有种丰富度明显高于其他亚区,其雉科鸟类特有种数量分别为9、6和6种,同时还有不少种类是局限性分布和间断性分布．     

呼和浩特市市区春季鸟类群落结构及多样性研究

2004年4月对呼和浩特市市区不同类型城市化栖息地的鸟类分别进行了调查.共记录到鸟类32种,隶属于19科,9目.研究了不同类型栖息地中鸟类群落的多样性、均匀度、丰度、种间相遇机率等群落特征.调查结果显示:不同类型栖息地中,公园、苗圃的鸟类多样性和均匀度最高;商业区、交通占地的鸟类多样性和均匀度最低.     

拟建成都港鸟类多样性研究

2011年10月—2012年10月,采用样线法对四川省拟建成都港周围地区3种生境的鸟类进行了调查.共记录到鸟类80种,隶属于8目28科,其中优势种占6.25%,常见种占28.75%,稀有种占65.00%;留鸟35种(占43.75%),夏候鸟19种(占23.75%),冬候鸟22种(占27.50%),旅鸟4种(占5.00%).从种类数量、物种多样性指数(H′)、均匀度指数(J)值来看,农田中的鸟类资源最为丰富,且群落稳定,加强对水域和村舍生境的保护可保持鸟类的数量和多样性.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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