福建戴云山国家级自然保护区种子植物区系分析

通过野外样地调查,结合文献资料和标本鉴定,对戴云山自然保护区植物区系特征进行了分析。结果表明,保护区内植物多样性丰富,共有野生种子植物1 753种,隶属于181科741属;种子植物科的组成以中科、小科为主,种数集中在中等科,优势科不是很明显;种子植物属的组成以极小属为主,种数集中在小属;种子植物科、属的地理区系成分复杂,以热带、亚热带成分占优势,兼具部分温带性质;属于中国特有种有18属20种。     

赤水桫椤自然保护区种子植物区系特征分析

在对赤水桫椤国家级自然保护区种子植物进行详细调查的基础上,对其生活型及植被类型、属的系数、科和属的分布区类型、保护和特有植物进行了统计分析.结果表明:1)保护区内植物类群丰富,种子植物区系成分复杂;2)种子植物生活型以草本植物为主,植被群落类型多样;3)优势科、优势属明显;4)植物区系以热带成分为主,具有向温带过渡的性质;5)种子植物区系起源古老;6)国家重点野生保护及贵州特有植物较为丰富.     

海子山自然保护区种子植物区系组成分析

在对海子山自然保护区详细调查的基础上,对其种子植物的生长型组成、科及属的分布区类型进行了统计分析.结果表明:①保护区内种子植物丰富,共101科,456属,1418种;②生长型相对单一,以草本占优势;③优势科、属明显;④种子植物地理成分复杂.吴征镒划分的中国种子植物属的15大分布类型均有分布;⑤区系特征具明显的温带性质,温带分布科36科,占总科数的48.00%,温带分布属329属,占总属数的80.05%.⑥起源古老,特有属种及珍稀濒危植物较丰富.     

重庆市玉龙山国家森林公园种子植物区系分析

在对重庆玉龙山国家级森林公园种子植物详细调查的基础上,进行归类统计分析.结果表明:1)该区种子植物类群丰富,共有种子植物150科、600属、1 074种,其中裸子植物8科、15属、18种,被子植物142科、585属、1 056种;2)种子植物分布区类型较为复杂,具有中国绝大多数的科分布区类型与所有属的分布区类型;3)种子植物起源古老;4)优势科、属明显;5)各类群生活型中,数量上以草本为主,而对公园影响而言,木本种类更为重要;6)地理成分复杂,温带性质明显且具有较深的热带渊源;7)与邻近风景区相比,公园种子植物科的数目及属的种类较多,但种的数目较少.以上结果可为该区森林公园的建设、保护与管理提供理论和实践依据.     

甘肃博峪河自然保护区种子植物区系

博峪河自然保护区位于甘南藏族自治州舟曲县西部和陇南市文县的西北部,是以保护湿地生态系统和大熊猫及其栖息地为主的自然保护区,总面积91 712 hm2.在调查和参考相关文献的基础上,对本区种子植物区系进行了研究.结果表明,保护区有种子植物1 092种,隶属于497属,116科,其中裸子植物4科10属20种,被子植物112科487属1 072种(双子叶植物101科408属901种,单子叶植物11科79属171种).种子植物区系特征为:①区系组成复杂,类群丰富;②温带性质明显;③ 起源古老,并兼有年轻成分;④过渡性和交汇性明显;⑤优势科明显,单种属和少种属较多;⑥中国特有种丰富;⑦与西南、华中、华北植物区系联系紧密.     

西南大学校园种子植物区系组成及特征分析

在对西南大学校园种子植物进行拉网式调查、标本采集和鉴定的基础上,对其科、属的分布区类型进行了统计分析,得出其区系特征如下:①种子植物类型较为丰富,区系成分较为复杂.校园共有种子植物125科,452属,671种;其中栽培植物357种,占53.2%;共包含10种科的分布区类型、15种属的分布区类型及变型.②植物区系成分中,以热带成分为主,温带成分也较为丰富,呈现出一定的过渡性.③特有、珍稀濒危及重点保护植物种类较为丰富.④属种系数相对较高,说明其生境较为简单,这与栽培植物的来源多样性密切相关.     

白河自然保护区种子植物区系特征

在对四川白河自然保护区种子植物资源多次调查和大量标本采集、鉴定的基础上,对其种子植物的科属组成、分布区类型、区系特征等进行了统计和分析.表明:①保护区区系成分复杂,类型丰富;②优势科、属明显;③起源古老;④地理成分复杂;⑤具明显的温带性质;⑥具明显的过渡性质;⑦分化现象明显,特有属、种丰富.     

宁夏罗山种子植物区系研究

为了研究宁夏罗山国家级自然保护区植物区系科的性质与特点,于2006-2010年对其植物种类进行了野外调查,标本采集,鉴定分类及统计和分析.结果表明,宁夏罗山自然保护区内种子植物有64科、203属、365种,种子植物种类丰富;保护区植物区系年轻,地理成分复杂,具有明显的温带性质;植物区系处于青藏高原植物区系、华北植物区系...     

历山种子植物的调查研究

山西历山自然保护区植物资源丰富,经过调查研究,初步统计该保护区有种子植物964种（含变种67）,隶属于491属123科.分析了历山种子植物的科型、属型、种型及其经济用途,对该保护区种子植物资源的开发利用提出了建议.     

大木山自然保护区种子植物区系初步研究

在野外调查和分类的基础上,对大木山自然保护区种子植物区系进行了初步研究.结果表明:大木山自然保护区植物资源十分丰富,共有种子植物137科,648属,1400种.科的优势现象明显,优势科为蔷薇科、菊科、禾本科、豆科和百合科.地理成分复杂,种子植物科的分布区类型有10个,热带成分占优势,属的分布区类型有15个,种的分布区类型有14个,温带性质属种略多于热带性质属种,区系具有明显的过渡性特征.种子植物区系起源古老,特有成分和珍稀保护物种丰富.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.