城乡关联性测度与协调发展研究--以西安市为例   总被引：20，自引：1，他引：19  

罗雅丽  李同昇 《地理与地理信息科学》2005,21(5):68-71

分析城乡关联与协调发展的关系及协调发展的内涵;结合昂温对城乡关系的分析,认为城乡关联性可以通过测度促进城乡间各种要素“流”形成的空间介质的质与量及要素“流”的实际流量、流速和流向来评价,进而提出城乡关联性测度的指标体系及测度方法。通过对西安市1980--2003年城乡关系演变历程的研究与分析,验证该指标体系的科学性,并指出目前西安市城乡协调发展的关键问题。  相似文献   

地区旅游业应对外部竞争环境的策略组合     

唐继刚  杨达源  董杰  舒肖明  周彬 《地理与地理信息科学》2005,21(2):102-104,F003

该文总结了旅游地空间竞争的层次、形式与影响因素。以其为理论基础,提出地区旅游业可从3方面积极应对外部竞争环境,即合理确定旅游资源开发价值与开发方向、与相邻地区旅游协作和提高地区旅游竞争力,并针对每方面提出了具体的策略和建议。以与天柱山、天堂寨相邻的岳西县为例,分析该县内外风景区之间现实和潜在的空间竞争关系,阐述岳西县旅游业需要采取的竞争策略组合。  相似文献   

Oligocene biogeography of the North Pacific (Implications of Mollusks)     

Yu. B. Gladenkov  V. N. Sinel’nikova 《Stratigraphy and Geological Correlation》2009,17(1):98-110

First biogeographic maps are proposed for the late Eocene-Oligocene of the North Pacific. The maps are compiled based on distribution of 120 molluscan species studied in 30 reference sections of the region. The analyzed Machigar (Sakhalin), Rategin, Amanina-Gakh (western Kamchatka), Asagai-Momidziyama (Japan) type assemblages and their age analogues are well known and described long ago. Over 50 schematic biogeographic maps illustrate distribution areas of different taxa in the late Eocene, early Oligocene, and late Oligocene epochs. Some of them characterize distribution areas of individual species, while the others depict habitat areas of typical (Machigar and Rategin) assemblages or certain genera different in terms of their thermotropism. Analysis of the maps resulted in recognition of the Japan-Kamchatka and Kamchatka-North American paleoprovinces, and indications of general gradual seawater temperature decrease during the Oligocene are defined. The attention is paid to the commenced diversification of North Pacific biota that leads to formation of boreal communities and also to different-rank the amphipacific dusjunctions.  相似文献   

中国北方大陆及邻区岩石圈演化及与大规模成矿作用关系          下载免费PDF全文

邱瑞照周 肃谭永杰祁世军高 鹏李文渊陈秀法王靓靓  陈正  元春华  韩九曦王圣文冯艳芳 《中国地质》2009,36(3):544-563

根据地质和地球物理特征,中国北方大陆可区分为造山带型和裂谷型两类岩石圈,其中造山带型又可区分出分别代表古生代、中生代和新生代物质结构的造山带型岩石圈:在从空间上,自西向东分别由以天山为代表的新生代造山带型、以额济纳旗为代表的古生代造山带型、以大兴安岭为代表的燕山期造山带型和张广才岭为代表的新生代裂谷型岩石圈组成,反映了古生代形成的中亚造山带在中新生代大陆动力学过程中的分异演化,导致不同类型岩石圈形成和陆壳、岩石圈地幔物质组成、结构的不均一性,以及构成大规模成矿作用大体上以E110°为界,西部主要为晚古生代,东部主要为中生代的格局.简要讨论了不同岩石圈类型的壳幔物质、结构的地质含义,以及区域找矿方向和深部找矿空间问题.  相似文献   

滇黔桂盆地及邻区泥盆纪层序地层格架及其古地理背景   总被引：14，自引：0，他引：14  

梅冥相  曾萍  初汉明  刘智荣  李东海  孟庆芬  易定红 《吉林大学学报(地球科学版)》2004,34(4):546-554

滇黔桂盆地及其邻区的泥盆系包括下部的海侵碎屑岩系、中部的混合沉积地层和上部的碳酸盐岩地层,其中又可以进一步划分为13个三级沉积层序和两个二级构造层序.不同阶段三级层序的相序组构特征及其空间变化代表了不同的岩相古地理背景,形成了一个受海平面变化和区域构造运动共同控制的沉积盆地充填序列;同时也反映出研究区域三级海平面变化与欧美地区相对比存在较大的差异.  相似文献   

华南丘陵地区城市地下空间开发利用前景   总被引：2，自引：2，他引：0       下载免费PDF全文

杨文采  田钢  夏江海  杨波 《中国地质》2019,46(3):447-454

地下工程设施的最大优点是节能和安全。节能来自于地下的恒温环境,安全来自于封闭的环境,很少人为的干扰。本文基于杭州市西湖一带山体结构特点和地下空间开发适宜性分析,提出华南丘陵地区的城市地下空间开发有广阔的利用前景。具体阐述了如何保持优秀生态环境的科学问题,可利用地下空间的分类和特点,可利用地下空间的调查内容和方法。针对当前地下空间开发利用存在的问题,提出了华南丘陵地区城市地下空间开发利用的建议。  相似文献   

UNIFIED EARTHQUAKE CATALOG FOR CHINA’S SEAS AND ADJACENT REGIONS AND ITS COMPLETENESS ANALYSIS          下载免费PDF全文

XIE Zhuo-juan  LI Shan-you  LÜ  Yue-jun  XU Wei-jin  ZHANG Yu-ling  LIU Wen-xin 《地震地质》1979,42(4):993-1019

China’s seas and adjacent regions are affected by interactions among the Eurasian plate, the western Pacific plate, and the Philippine Sea plate. Both intraplate and plate-edge earthquakes have occurred in these regions and the seismic activities are frequent. The coastal areas of China are economically developed and densely populated. With the development and utilization of marine energy and resources along with the development of national economy, the types and quantity of construction projects in the marine and coastal areas have increased, once an earthquake happens, it will cause huge damage and loss to these areas, therefore, the earthquake-related research for these sea areas cannot be ignored and the need for study on these areas is increasingly urgent. One type of essential basic data for marine seismic research is a complete, unified earthquake catalog, which is an important database for seismotectonics, seismic zoning, earthquake prediction, earthquake prevention, and disaster reduction. Completeness and reliability analysis of an earthquake catalog is one of the fundamental research topics in seismology.
At present, four editions of earthquake catalogs have been officially published in China, as well as the earthquake catalogue compiled in the national fifth-generation earthquake parameter zoning map, these catalogs are based on historical data, seismic survey investigations, and various instrumental observations. However, these catalogs have earlier data deadlines and contain the earthquake records for only the offshore regions of China, which are extensions of coastal land. Distant sea regions, subduction zones, and adjacent sea regions have not been included in these catalogs. Secondly, there were no cross-border areas involved in the compilation of earthquake catalogs in the past. It was not required to use magnitudes measured by other countries’ seismic networks and observation agencies to develop an earthquake catalog with a uniform magnitude scale, moreover, there was no formula suitable for the conversion of magnitude scale in China’s seas areas and adjacent regions. Little research has been conducted to compile and analyze the completeness of a unified earthquake catalog for China’s seas and adjacent regions. Therefore, in this study, we compiled earthquake data from the seismic networks of China and other countries for China’s seas and adjacent regions. The earthquake-monitoring capabilities of different sea areas at different time periods were evaluated, and the temporal and spatial distribution characteristics of epicentral location accuracy for China’s seas and adjacent regions were analyzed. We used the orthogonal regression method to obtain conversion relationships between the surface wave magnitude, body wave magnitude, and moment magnitude for China’s seas and adjacent regions, and established magnitude conversion formulae between the China Seismic Network and the M_L magnitude of the Taiwan Seismic Network and the M_S magnitude of the Philippine Seismic Network. Finally, we developed an earthquake catalog with uniform magnitude scales for China’s seas and adjacent regions.
On the basis of the frequency-magnitude distribution obtained from the magnitude-cumulative frequency relationship (N-T) and the Gutenberg-Richter(GR)law, we conducted a completeness analysis of the unified earthquake catalog for China’s seas and adjacent regions, Then, we identified the beginning years of each magnitude interval at different focal depth ranges and different seismic zones in the earthquake catalog.
This study marks the first time that a unified earthquake catalog has been compiled for China’s seas and adjacent regions, based on the characteristics of seismicity in the surrounding sea regions, which fills the gap in the compilation of the earthquake catalogue of China’s seas and adjacent areas. The resulting earthquake catalog provides a basis for seismotectonics, seismicity study, and seismic hazard analysis for China’s seas and adjacent regions. The catalog also provides technical support for the preparation of seismic zoning maps as well as for earthquake prevention and disaster reduction in project planning and engineering construction in the sea regions. In addition, by evaluating the earthquake-monitoring capability of the seismic networks in China’s seas and adjacent regions and analyzing the completeness of the compiled unified earthquake catalog, this study provides a scientific reference to improve the earthquake-monitoring capability and optimizing the distribution of the seismic networks in these regions.  相似文献   

元江—红河界河地区土壤侵蚀研究          下载免费PDF全文

张伟华  赵志芳  谈树成  李益敏  王爱芸 《中国地质调查》2017,4(3):64-69

为支撑我国界河地区国土防护工作,以中国、越南交界的元江—红河界河地区为研究区,基于3S技术进行界河地区的土壤侵蚀研究。采用Landsat 8卫星遥感数据,基于水体指数、植被覆盖度、土壤可蚀性及坡度进行土壤侵蚀强度研究,初步建立了界河地区的土壤侵蚀强度遥感评价方法,提出了界河地区国土防护措施与建议。  相似文献   

The management performance of marine protected areas in the North-east Atlantic Ocean     

《Marine Policy》2017

In the North-east Atlantic Ocean there are 550 inshore and offshore MPAs established to accomplish a high diversity of objectives, which can be classified into 24 different types of MPA designations. Only 153 of these MPAs have a management plan (MgP) --the basic tool required for an effective management. Amongst these, only 66 are actually managed, i.e. they have the staff and resources required to operate the plan. A common characteristic of these MPAs is the lack of standardized indicators of their performance. In order to address this issue, an alternative approach was developed based on the assessment of management performance using the expert knowledge and perceptions of managers operating MPAs, a universal source of information that could allow overcoming the usual gaps due to the restrictions in coverage of scientific monitoring and assessments. MgPs showed differences among countries but were homogeneous within each country, reflecting the usual top-down approach in the establishment of MPAs. Compliance with the qualitative objectives present in MgPs was higher than compliance with quantitative ones (87% versus 50%), and the MPAs that most successfully achieved their objectives were those with regular monitoring. This analysis also shows that beyond these objectives, the establishment of an MPA and the activities developed as a consequence of its creation have a positive socio-economic impact on the local human community.  相似文献   

A regulation-based classification system for marine protected areas: A response to Dudley et al.     

《Marine Policy》2017

Dudley et al. [9] commented on our paper [11], arguing that the current IUCN objective-based categorization of protected areas, which is also used in marine protected areas (MPAs), should not be abandoned and replaced by the new regulation-based classification system [11]. Here we clarify that we do not advocate replacing the current IUCN categories, but highlight the benefits of using both the objective-based IUCN categories and the new regulation-based classification when applied to MPAs. With an increasing number of MPA types being implemented, most of them multiple-use areas zoned for various purposes, assessing ecological and socioeconomic benefits is key for advancing conservation targets and policy objectives. Although the IUCN categories can be used both in terrestrial and marine systems, they were not designed to follow a gradient of impacts and there is often a mismatch between stated objectives and implemented regulations. The new regulation-based classification system addresses these problems by linking impacts of activities in marine systems with MPA and zone classes in a simple and globally applicable way. Applying both the IUCN categories and the regulation-based classes will increase transparency when assessing marine conservation goals.  相似文献