中国红树林生态系统的植物种类、多样性、功能及其保护

本文从4个方面对中国红树林生态系统的植物进行论述：（1）中国红树林生态系统的红树植物、半红树植物、伴生植物、红树林区的大型藻类和浮游植物种类；（2）中国红树林生态系统植物的物种多样性、红树植物生理和形态适应的多样性、产物的多样性；（3）红树林的生态功能；（4）中国红树林生态系统的主要保护问题及其保护措施。     

Numerical Simulation of Non-Linear Wave Propagation in Waters of Mildly Varying Topography with Complicated Boundary

In this paper, the characteristics of different forms of mild slope equations for non-linear wave are analyzed, and new non-linear theoretic models for wave propagation are presented, with non-linear terms added to the mild slope equations for non-stationary linear waves and dissipative effects considered. Numerical simulation models are developed of non-linear wave propagation for waters of mildly varying topography with complicated boundary, and the effects are studied of different non-linear corrections on calculation results of extended mild slope equations. Systematical numerical simulation tests show that the present models can effectively reflect non-linear effects.     

Internal wave eigenmodes and their weak nonlinear resonant interaction in a nonlinearly stratified fluid—A preliminary theoretical and experimental study

A preliminary theoretical and experimental study was conducted on internal wave modes and their weak nonlinear resonant interaction in a nonlinearly stratified fluid. An asymptotical solution of the modes and a dispersion relation of internal waves in a stratified fluid with density profile similar to that in our experiment were obtained theoretically. The resonant-interaction mechanism to 2nd order approximation is also discussed. The resonant interaction of the 3rd and 4th mode internal waves excited by the unstable 1st mode wave is analyzed on the basis of data obtained by conductivity probes. The resonant-interaction condition, i.e., ,k ₁+k ₃+k ₄=0, is examined. It is shown that the resonant instability increases with pycnocline thickness and wave maker driving frequency. This work is supported by the National Natural Science Foundation of China.     

国土资源电子政务中GIS与工作流的集成应用研究

图文一体化已成为电子政务信息化建设的一项基本要求。基于模型级图文一体化的集成方式基本上解决了电子政务建设过程中GIS图形系统和工作流审批系统的开发相对独立的问题。模型级图文一体化的集成方式代表了GIS与工作流技术集成的发展趋势。本文以江苏省国土资源电子政务基础平台中GIS与工作流的集成为实例,研究了该电子政务平台中GIS的体系结构及GIS功能的划分,并从数据集成、用户权限角色集成、功能集成、用户界面集成等四个方面对国土资源电子政务平台实现图文的一体化。并在模型层次对GIS与工作流的集成进行了初步尝试。     

基于相关系数匹配的混合像元分解算法

遥感影像中的混合像元不仅影响地物识别和分类的精度,而且已成为遥感科学向定量化发展的主要障碍.为此,人们已经提出了多种混合像元分解算法,其中应用最为广泛的是最小二乘法.该方法虽然具有意义明确、简单易行等特点,但也易受局部噪声、大气效应、环境辐射等因素的影响.本文将混合像元分解问题归结为一个基于光谱匹配的非线性最优化问题,并针对最小二乘法的不足提出了一种新的基于相关系数匹配(spectral correlation matching, SCM)的混合像元分解技术.通过在北京市北三环及其以北区域内案例的研究表明:在城市区域内,利用图像选取终端端元的办法,基于相关系数匹配的混合像元分解算法的总体精度高于带全约束的最小二乘法(LS)的分解结果.对比分析表明:在目标光谱的绝对值整体放大或缩小而光谱形状得到了很好的保持、及局部噪声使得光谱值显著变化但光谱形状得到了一定程度保持时,基于光谱形状的相关系数法可以得到比基于光谱绝对值的最小二乘法精度更高的分解结果.     

分布异构空间数据协同编辑关键技术研究

分布式环境下空间数据库的异构、多源、多平台特性,使不同系统之间难以实现协同处理。为实现分布异构空间数据的协同编辑,在研究网络要素服务(Web Feature Service,WFS)规范的基础上,对WFS规范中的锁定、编辑操作进行了改进,同时将发布订阅机制引入到基于WFS的网络空间数据编辑处理中,使其能够适应协同编辑的需求,并以此为基础提出了基于WFS的一致性控制机制、编辑机制和发布订阅机制,最后建立了相应的原型系统以验证其有效性。     

胶东半岛大磨曲家金矿床成矿流体物理化学条件演化

胶东大磨曲家金矿床流体包裹体包括水溶液包裹体、富CO2包裹体和高盐卤水包裹体3种类型,前两者发育较多,高盐卤水包裹体发育极少。流体包裹体显微测温及盐度、密度、压力估算显示,水溶液包裹体均一温度为98~376℃,据冰点温度估算,盐度为0.53%~8.28%,水溶液包裹体均一压力低于50×105Pa;富CO2包裹体完全均一温度为255~348℃,盐度为2.42%~11.43%,均一压力为1 000×105~2 500×105Pa;富CO2包裹体中CO2均一温度为23.0~32.4℃,指示该类包裹体可能含有数量不等的CH4或H2S。静水压力体制下,根据纯CO2包裹体均一压力估算成矿深度约为1 km。在270℃左右,均一压力从富CO2包裹体到水溶液包裹体急剧降低,指示成矿流体在270℃左右可能发生过一次减压沸腾过程,成矿流体盐度和密度在270℃左右也有显著的变化。因此,沸腾作用及其引起的成矿流体物理化学条件的急剧变化可能是导致大磨曲家金矿床成矿物质沉淀的重要机制。     

天然气水合物成矿带的识别技术研究

在天然气水合物的地震资料解释过程中,常规地震剖面上难以识别水合物成矿带的准确位置。通过多年的实践对比研究,认为波形、速度反演、速度模型、流体因子、瞬时振幅、相对极性和能量半衰时等各种地震剖面,能够较好地揭示水合物成矿带的地球物理异常特征。收集整理了一部分国内外对水合物成矿带的识别技术,并提出了在无井的情况下,如何利用波形、速度和各种地震属性剖面所提供的信息来确定水合物成矿带的一些新想法,以期对水合物资源量的评估能提供比较有价值的参考依据。     

用MapGis实现区域化探数据的空间分析

用VB程序,把区域化探数据点位信息转化为MapGis明码格式的点文件,再与化探数据连接,完成空间数据库的建立。笔者以河北省1∶20万区域化探数据为例,建立了省级区域化探空间数据库,利用该数据库在MapGis上进行空间分析———点对地质区的相交分析、条件查询、缓冲区分析等,实现了基于空间和地质条件约束的数据查询,解决了与成矿有关的地质问题。     

Early Uplift History of the Tibetan Plateau:Records from Paleocurrents and Paleodrainage in the Hoh Xil Basin

Paleocurrent indicator data collected in field work were used to study the early Cenozoic regional paleodrainage patterns in the Hob Xil basin in northern Tibetan plateau. The paleocurrent directions of the Eocene Fenghuoshan Group obviously show that the flows were northward with a unidirectional dispersal pattern. This probably reflects the uplift of the Qiangtang terrain during the initial basin deposition period and indicates that the Tanggula Moutains occurred as topographic highlands at least in the Eocene. Paleoflows of the Oligocene Yaxicuo Group were dominantly oriented to the north and then flowed eastwards during its late deposition. This regional variability of paleodrainage patterns of the Yaxicuo Group is interpreted to record the dispersal style of sediments from transverse rivers to longitudinal river systems. It is inferred that the Oligocene uplift of the Kunlun Mountains obstructed by northward paleoflows and created longitudinal river systems parallel to the orogenic belts. The temporal and spatial changes of the paleodrainage patterns suggest that the northern boundary of the Tibetan plateau during the early Cenozoic was situated in the Hoh Xil area and its uplift has progressed northwards through time.