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我国湿地研究进展——献给中国科学院长春地理研究所成立40周年 总被引：74，自引：9，他引：65
回顾了我国湿地研究,尤其是近１０年的研究进展,包括湿地资源的综合考察,湿地基本概念的开发,湿地功能研究、湿地资源的保护与合理利用,并对我国湿地研究提出了展望。 相似文献
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《Urban geography》2013,34(8):698-719
This paper examines the structural effects of colonization on city-size distribution in Bangladesh. It also explores how development policies of independent Bangladesh impacted subsequent patterns and trends of urbanization in the country. The urban structure is analyzed using rank-size plots, a rank-size regression model, and a rank-mobility index. The historical analysis of city rank-size relationships reveals the structural effect of the policies of the British to concentrate urban functions in few urban centers, the Pakistani period of primate-city development, and the deconcentration policies of the Bangladeshi period. The top few cities continue to dominate, irrespective of Bangladesh's government plan to reverse development polarization caused by urban primacy. 相似文献
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甘肃省各地区自然、社会、经济、文化、人口差异很大,影响经济发展和人口分布的因素也各不相同,为了分析清楚甘肃省经济发展与人口空间分布的现状,本文采用2004年最新统计数据对甘肃省经济不均衡性与人口分布的相关关系进行分析。首先通过计算基尼系数和地理联系率,分析比较了甘肃省主要经济部门与人口空间分布的集中与分散程度,然后通过计算地区综合经济指数、文化水平综合均值,分析甘肃省综合经济水平与人口发展的相关关系,从经济部门的内部组成与外部综合经济实力两个方面分析了甘肃省经济与人口分布以及综合经济水平与综合人口素质的空间关系,为甘肃省经济合理布局和适度人口政策的制定提供了参考意见,为地区经济、人口协调可持续发展提供理论基础。 相似文献
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Yoshitaka Fukuoka 《The Professional geographer》1980,32(2):224-230
This is the last in a series of reports on various aspects of geographic research in Japan. The series has been sponsored by the United States Committee for the International Geographic Union in anticipation of the 1980 IGC in Tokyo. Like its predecessors, this report has been modified by H. Jesse Walker, member of the Committe, for the benefit of English-speaking readers of THE PROFESSIONAL GEOGRAPHER. 相似文献
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Henry W. Lawrence 《The Professional geographer》1988,40(2):159-175
Different types of farming in metropolitan areas show both negative and positive responses to urban and nonurban forces of change. The variety of impacts has been neglected by most spatial intensity models and land use studies. This study examines census data from 1949 to 1982 in seven major U.S. metropolitan areas for six commodity types to detect regular patterns of changes in sales value, area harvested, number of animals, and intensity of production. Results show large declines in dairy farming, followed by poultry and fruit and nuts; some recent recovery in vegetable crops; and steady increases in both low value field crops and high value horticultural specialties. A trend toward polarization of metropolitan agriculture is indicated. Results also show differences between inner and outer urban fringe areas and a decline in the differential in intensity of production between metropolitan and non-metropolitan agriculture. 相似文献