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我国内陆边境贸易的区位研究 总被引：2，自引：0，他引：2
本文在归纳我国内陆边境贸易现状特征后,分析了边境贸易形成和发展的区位因素.在此基础上探讨了我国内陆边境开放条件的地域分异,并提出边贸发展的重点地域. 相似文献
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边疆安全是中国安全的重要组成,囿于历史累积和发展中新生矛盾,需要在全球经济一体化进程中重塑中国边疆地缘安全.中国陆疆问题已由早期的勘界、民族与经济落后问题演进为民族自治、经济发展与跨国极端宗教势力渗透,这在西北边疆尤为突出;中国海疆问题始终被勘界、海洋资源利用与权益治辖以及个别强国（或其依附国）海军侵扰所困,这在东海与南海日益显著.日益趋向复杂化的中国陆疆与海疆问题,既使中国边疆经济社会发展环境日益脆弱,又离散边疆居民中华文化认同度,甚至使个别边疆问题转换内地稳定问题.研究认为边疆问题主要通过事件自身性质及其在互联网与新媒体传播的瞬时蝴蝶效应、周边邻国政局动荡/大国侵扰的边界效应和国际社会对中国和平崛起的不信任效应等方式作用于国家安全,侵蚀中国发展的经济、社会、政治成效与国际形象等. 相似文献
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ABSTRACT. Like the North American frontier, Ecuador's Amazonian margin has advanced in periodic waves. But the impetus has been extremely varied, interlacing periods of socioeconomic crisis with times of prosperity. Recent events in eastern Ecuador confirm that urbanization is a fundamental component of frontier development in South America. The urbanization process is not a sign, however, of regional economic strength. Capital gains at the periphery are transferred to the nation's core region. Even the larger boom towns display little functional specialization; they are, instead, precariously dependent on employment in the public‐service sector. Nonetheless, urban centers in the Ecuadorian Amazon continue to grow and to drain surrounding rural areas of younger and more educated individuals. 相似文献
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中国南部长城--苗疆长城的旅游开发与保护 总被引：1，自引：0，他引：1
中国“南部长城———苗疆长城”是珍贵的文化遗产 ,已成为湖南省西线旅游开发的一个热点。文中分析了“长城”沿线旅游资源赋存和旅游开发优势 ,认为要实现“苗疆长城”文化遗产保护与旅游开发的和谐一致 ,必须强化遗产保护意识 ,积极申报世界文化遗产 ,加强遗产管理 ,依靠科技进步 ,走可持续发展之路 相似文献
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William Norton 《The Professional geographer》1984,36(1):18-27
The evolving agricultural landscapes of frontier settlement are related to distance from entry points, to distance from urban centers, and to aspects of the physical environment. Canonical correlation procedures applied to nineteenth century data for Cape Province, South Africa, and southern Ontario, Canada suggest that commercialization, regionalization and specialization increase through time. Results for southern Ontario are confirmed while those for Cape Province reflect the impact of an expanding frontier area. 相似文献
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Although acts of creation, scientific or artistic, result from metaphorical and mythological speculations, the role of metaphor and myth has largely been neglected in attempts to develop a geographical epistemology. The significance of these concepts is illustrated by the use of the frontier symbol as a means of understanding both the social structure of the contemporary black inner city and the temporal dimension of the recent expansion of human activities into nighttime. 相似文献
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Jeffrey B. Roet 《The Professional geographer》1985,37(2):173-183
From 1900 to 1920 the land alienation process in the northern Great Plains was primarily influenced by location, not land quality, in a railroad-dominated settlement pattern. Homesteaders in Sheridan County, MT and Bowman County, ND generally did not settle on the best lands first and assessed the productive acreage on their claims inaccurately. In peripheral locations, homesteaders who perceived soil resources correctly took the higher quality lands first. Evidence suggests abandonment was most likely on poorer soils, least likely on the best soils. Inability to perceive soil capability exacerbated an unstable situation that, with drought, led to out-migration. 相似文献
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本文对极地海洋病毒的国内外研究现状进行了扼要阐述,尤其是海冰融化对病毒的生态影响。内容包括极地海域的浮游病毒丰度、多样性及在碳循环中的作用研究,以及我国在极地科考中所进行的与浮游病毒相关的工作。并提出了今后在极地海域要解决的与病毒相关的科学问题。 相似文献
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在回顾了我国高山土壤分类后,概述了高山土壤的诊断层和诊断特性,阐述了土壤分类命名原则,提出了新的高山土壤分类系统以及涉及这些土壤的土纲及其以下级别的检索。 相似文献
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对2010年4月21～23日文山州久旱转大雨过程的环流演变及各种物理量场特征进行诊断分析,结果表明:干旱期文山长期维持"西高东低"环流型,环流形势的调整,尤其是中纬度环流形势向"东高西低"转变,是久旱转雨的必要条件。这次过程也与高空冷槽、低涡切变和不稳定层结(能量)的发展等有关。久旱转雨时,各物理量场的分布与该区域降水相关性很好,具有很明显的指示意义。 相似文献
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通过塔克拉玛干沙漠腹地满参、肖塘两地气候观测数据和北缘山前绿洲轮台的气象站资料进行对比分析，结果表明：从沙漠外缘至腹地温度呈升高超势，气温日较差和年较差最大值在位于外缘和腹地之间的肖塘；降水表现为外缘多于内部，某一时期内部降水又明显多于外缘，并且年降水量决定于某一次降水过程；愈深入沙漠内部，湿度越低、蒸发越大。 相似文献
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