A Method for Alpine Wetland Delineation and Features of Border: Zoigê Plateau,China

Accurate wetland delineation is the basis of wetland definition and mapping, and is of great importance for wetland management and research. The Zoigê Plateau on the Qinghai-Tibet Plateau was used as a research site for research on alpine wetland delineation. Several studies have analyzed the spatiotemporal pattern and dynamics of these alpine wetlands, but none have addressed the issues of wetland boundaries. The objective of this work was to discriminate the upper boundaries of alpine wetlands by coupling ecological methods and satellite observations. The combination of Landsat 8 images and supervised classification was an effective method for rapid identification of alpine wetlands in the Zoigê Plateau. Wet meadow was relatively stable compared with hydric soils and wetland hydrology and could be used as a primary indicator for discriminating the upper boundaries of alpine wetlands. A slope of less than 4.5° could be used as the threshold value for wetland delineation. The normalized difference vegetation index(NDVI) in 434 field sites showed that a threshold value of 0.3 could distinguish grasslands from emergent marsh and wet meadow in September. The median normalized difference water index(NDWI) of emergent marsh remained more stable than that of wet meadow and grasslands during the period from September until July of the following year. The index of mean density in wet meadow zones was higher than the emergent and upland zones. Over twice the number of species occurred in the wet meadow zone compared with the emergent zone, and close to the value of upland zone. Alpine wetlands in the three reserves in 2014 covered 1175.19 km2 with a classification accuracy of 75.6%. The combination of ecological methods and remote sensing technology will play an important role in wetland delineation at medium and small scales. The correct differentiation between wet meadow and grasslands is the key to improving the accuracy of future wetland delineation.     

Current Knowledge of Mesozoic Coleoptera from Daohugou and Liaoning (Northeast China)

<正>The present paper is devoted to an overview on fossil Coleoptera studied from Inner Mongolia, Daohugou(Middle Jurassic,Jiulongshan Formation)and Liaoning(Upper Jurassic-Lower Cretaceous,Yixian Formation)deposited in Chinese collections.As a result,species of the tribe Sperchopsini and Hydrophilini from Hydrophilidae,families and subfamilies Silphidae,Syndesinae from Lucanidae,Pleocomidae,Trogidae, Trogissitidae,Pyrochroidae,Diaperinae from Tenebrionidae,and Cerambycidae were first registered in the Mesozoic and some families were defined as new.It was shown that many superfamilies represented in the Recent Fauna were formed within the Middle Jurassic and Lower Cretaceous.The materials examined confirm the hypothesis that Cucujiformian beetles are a younger group than other infraordera of Polyphaga(Staphyliniformia and Elateriformia)and,therefore,they appeared in the fossil record only in the late Mesozoic.It was shown and confirmed that most superfamilies appeared in the fossil records before Cucujoidea.The synonymy of Notocupes Ponomarenko,1964;Sinocupes Lin,1976,syn.nov.;Amblomma Tan,Ren et Liu 2005,syn.nov.;Euryomma Tan, Ren et Shih,2006,syn.nov.,non Stein,1899 and Ovatocupes Tan et Ren,2006,syn.nov.;synonymy of Tetraphalerus Waterhouse,1901 and Odontomma Tan,Ren et Ge 2006,syn.nov.;and synonymy of Priacmopsis Ponomarenko,1966 and Latocupes Tan et Ren,2006,syn.nov.are proposed.Sinorhombocoleus papposus Tan et Ren,2009 is transferred from the family Rhombocoleidae to Schizophoridae.Cervicatinius complanus Tan,Ren et Shih,2007 and Forticatinius elegans Tan,Ren et Shih,2007 are transferred from the family Catiniidae(suborder Archostemata)to superfamily Cleroidea(suborder Polyphaga:first among the family Peltidae and second as a closely related group to the latter family).The family Parandrexidae is transferred from the superfamily Cucujoidea to Cleroidea.The ecological circumstances of the past ecosystems and hypotheses of historical development of the order Coleoptera are discussed.The age of faunas examined is considered.The list of the taxa described from Daohugou and Liaoning is compiled.     

微波消解-分光光度法测定钒钛磁铁矿中的钒

采用硫-磷混合酸微波消解对难溶的钒钛磁铁矿进行前处理,用5-溴-PADAP-过氧化氢分光光度法测定矿样中的钒,优化了微波消解的实验条件.加入浓磷酸和40 g/L氟化钠溶液分别消除了共存常量元素铁和钛的干扰.方法检出限为0.004 μg/mL,线性范围为0.01～1.0 μg/mL . 应用于实际钒钛磁铁矿样品中钒的测定,重现性好,检出限较低,灵敏度较高,能够满足简单、快速、批量分析的要求.     

中国内陆中心城市物流竞争力比较研究——以西安与郑州为例

针对内陆中心城市物流发展状况,提出内陆中心城市物流竞争力的内涵,构建内陆中心城市物流竞争力评价体系。对内陆城市西安和郑州进行评价研究,得出内陆中心城市发展物流竞争力的现状与潜力、水平与特色、发展的条件与基础等方面的特征。结果表明:内陆中心城市在物流发展过程中存在产业结构不合理、基础设施落后、信息化水平较低、制度政策不完善等问题。针对上述问题给出相应的对策及建议,以期为内陆城市物流业相关评价和决策提供参考。     

SHM在数字地震波形分析中的应用

模拟地震学向数字地震学的转变具有划时代的意义。我国“九五”期间陆续建成了48个国家数字地震台站,记录了丰富的数字地震波形资料。介绍了对这些资料进行分析的一套软件SHM,并给出了部分分析结果。     

测绘工程双语教学模式的探讨与实践

在对双语教学模式进行分析和研究基础上,指出我国的双语教学应该属于“保持型双语教学”。结合测绘工程专业教学特点,介绍在测绘工程精品优质课程双语教学实践中,采取的教学模式和方法,分析测绘工程双语教学存在的问题,讨论提出双语教学工作开展的建议和策略。     

"数字高校校园"系统的构建

通过对“数字高校校园“的必要性分析,探讨了有关CGIS系统软件平台选择、系统分析、系统数据结构设计以及系统功能等问题.并以北京师范大学为例,以土地利用类型为基点设计属性数据,再利用GIS工具对空间数据与属性数据进行绑定,搭建数字化平台,实现地图功能,建立CGIS,以期使高校校园的资源与环境信息得到共享,从而有利于高校校园的管理.     

LMA－3型激光微量物质分析仪

ＩＭＡ－３型激光微量物质分析仪是用小型封闭式紫外脉冲激光器做激发光源，根据激光－时间分辨荧光分析原理设计的一种通用型微量物质分析仪器。仪器由激光器系统和测量系统两部分组成，适用于发光寿命在１μｓ～１０ｍｓ的物质测量。该仪器灵敏度高、选择性好、操作简单、有较好的稳定性和可靠性，检出下限可达１０￣（－１３）ｇ／ｍｌ（Ｅｕ）．在１×１０￣（－１０）～２×１０￣（－８）ｇ／ｍｌ量级测量时ＲＳＤ在５％～１０％范围。