排序方式： 共有25条查询结果，搜索用时 15 毫秒
11.
珠三角地区人口分布时空格局及其变化特征 总被引：7，自引：0，他引：7
采用人口增减变化、人口商度以及人口集聚度等方法,对珠三角地区1982、1990、2000和2010年4期人口普查数据进行了分析,定量揭示了珠三角地区近30年来人口分布的时空格局及其变化特征。结果表明：1）从人口总量变化来看,1982―2010年珠三角地区人口数量增加了3 821.66万人,增长率达215.61%,远超全国平均水平;2）从人口流动状态看,1982―2010年珠三角地区以人口流入为主,其中珠三角的中部以及东部城市成为人口流入的主要地区,人口迁移流入是珠三角地区总人口增加、人口集聚程度增高的主要原因之一,但近10年珠三角地区的人口流入速率有所减缓;3）从人口集聚度上看,1982―2010年珠三角地区县市人口集聚程度普遍高于全国平均水平,并逐年增高,深圳、广州、东莞等市已成为区域人口集聚中心。 相似文献
12.
13.
基于GIS的中国可持续人居功能分区评价(英文) 总被引：2，自引：0，他引：2
在中国1km×1km栅格尺度人居环境自然适宜性分类评价和分县尺度人口空间集聚程度分级评价的基础上,结合中国分县资源环境承载力和区域经济发展水平和发展潜力,确立了中国可持续的人居功能分区评价模型,提出了中国可持续发展的人居功能分区方案。研究表明:中国可持续的人居功能分区空间分布呈现东南半壁优于西北半壁的格局;人居功能强可持续地区面积约139.75×104km2,占国土面积的14.66%,相应人口4.3亿,接近总人口的1/3,主要分布在东南沿海、长江中下游地区、四川盆地、黄淮海平原以及东北平原的部分地区;人居功能较强可持续地区面积约193.61×104km2,占国土面积的1/5,相应人口3.2亿,接近总人口的1/4,主要分布在三江平原、辽河平原、山东半岛等地;可持续地区面积210.19×104km2,约占国土面积的22%,相应人口3.7亿,占总人口的28.24%,主要分布在呼伦贝尔高原、黄土高原和云贵高原等地,零星见于藏东南谷地和柴达木盆地等地区;较弱可持续地区,面积约145.85×104km2,占国土面积的15.30%,人口1.4亿,约占总人口的11%,零散分布于黄土高原、川滇高原和云贵高原的部分地区;弱可持续地区面积约263.86×104km2,约占国土面积的27.68%,相应人口0.4亿,接近总人口的3%,主要分布在青藏高原、西北荒漠以及川滇高原北部地区。 相似文献
14.
城市增长边界划定能有效遏制城市无序扩张,优化城市开发空间,保护生态环境。本文通过构建指标体系进行生态环境敏感性评价并提取了禁止建设区,利用POI与微博数据分析了居民活动扩展空间,基于构建的模型综合评价城市空间扩展潜力,并根据城市扩展预测规模划定了济南市2020年城市增长边界。研究结果表明:(1)城市生态环境敏感性评价能有效保护生态用地,为城市扩展提供生态基础。济南市生态环境敏感性较高的地区位于黄河、小清河两岸和东南部山区,中部、北部与西南部的生态环境敏感性则相对较低,城市扩展基础较好。(2)构建的城市居民活动扩展空间评价模型可以量化城市居民活动空间分布,济南市居民活动空间扩展高值区主要集中分布在济南市中部,多为现有建成区及周边地区。(3)基于生态与居民活动空间的城市增长边界划定方法具有一定的合理性,划定结果表明济南市空间扩展主要向东西两翼延伸,该边界与济南市发展的空间战略相符,与相关规划中总体格局一致。基于生态与居民活动空间的城市增长边界划定方法既保护了生态环境,又充分考虑城市扩展的内在驱动力,将为新时代下城市发展研究提供相关参考。 相似文献
16.
The relationship between population distribution and resources, environment and social-economic development has a significant influence on the human development. This paper set up a set of index system and model methods for the assessment of the coordination between population and resources, environment and social-economic development, and it quantitatively evaluated this coordination at the provincial scale in 2000 and 2010 respectively. Based on this set of index system, the suitability degree and the spatial-temporal pattern of population distribution at the provincial scale were carefully characterized. The restriction of population distribution at the provincial scale was graded and classified, and the coordinated development strategy of population, resources, environment and social economy was finally put forward. The results showed that:(1) The environmental suitability of population distribution at the provincial scale was generally high in China, which tended to be stable from 2000 to 2010.(2) The restriction of water and land resources at the provincial scale was generally strong in China, but it tended to be weak from 2000 to 2010.(3) The coordination degree between the social-economic development and population distribution at the provincial scale was mostly at a middle level, which was in the positive upward path from 2000 to 2010.(4) The suitability of population distribution at the provincial scale was mostly at a middle level, all of which was rising from 2000 to 2010.(5) The coordination degree between population distribution and resources, environment and social-economic development at the provincial scale was divided into four grades, including basic coordination, relative coordination, awaited coordination and urgent-needed coordination.(6) The basic ways to promote the coordinated development of population, resources and environment in different regions in China can be summarized as: implementing the strategy of population agglomeration and evacuation, guiding the orderly flow of population, optimizing the spatial distribution of population and drawing up the spatial planning of population development. 相似文献
17.
近年来,海南省海口市、三亚市等地人口快速增长,引起了各界对海南省承载力的担忧,需要研究制定承载力约束和经济增长需求下的人口与资源环境政策。为此,本文选取粮食产量、农产品营养成分和水资源量指标,分别定量测算承载力;采用就业弹性系数法,设定就业弹性系数和地区生产总值增长率,估算经济增长所需人口总量;利用PADIS-INT人口预测软件,设定总生育率、净迁移率等参数,预测人口变化情况。通过研究认为,2050年前海南省人口总量不会超过水土资源的承载力上限,全省总体上不存在人口过多的问题,而是存在人口不足的风险。建议海南省采取鼓励人口增长的政策措施,提升自然资源管理和国土空间治理水平,引导人口在全省均衡发展。 相似文献
18.
青藏高原独特的高寒环境与自然条件在一定程度上限制了人口的自然分布与有序发展,形成了中国面积大、分布广的“无人区”（UPAs）。然而,当前有关“无人区”面积、分布、特征与区域差异等研究尚无定论。客观、准确界定“无人区”的空间范围,对开展青藏高原资源环境承载力评价、国家公园与生态安全屏障建设等具有重要意义。基于青藏高原居民点分布信息,据其地形、气候、生态、土地利用等要素特征,本文综合表征了居民点的自然—生态—土地利用耦合关系,率定了居民点分布上限的各要素阈值,通过多要素空间叠加构建了“无人区”评价综合模型,并以居民点分布的自然极限、生态（含氧量）下限、土地利用规律为关键阈值界定了青藏高原“无人区”空间范围并分析了其地理分布特征。研究表明：① 以居民点分布累计比例< 0.1%计,确定“无人区”的地形阈值为海拔> 5665 m、相对高差> 2402 m、地形起伏度> 8.59,气候阈值为相对湿度< 76.2%、温湿指数< 33或 > 71。② 根据居民点分布及人体对含氧量耐受情况,确定“无人区”的生态阈值为气压< 500 hpa、大气含氧量< 40%。③ 青藏高原严格“无人区”面积达1912 km2,其中新疆699 km2、四川413 km2、西藏331 km2、青海291 km2、甘肃178 km2。空间上呈零星分散状,多分布在四川贡嘎山、珠穆朗玛峰附近等极高山地区、可可西里东部—罗布泊地区;以及少部分分布在青海柴达木盆地。 相似文献
19.
20.
中国分县生态承载力供需平衡空间格局分析(英文) 总被引：5，自引：1，他引：4
A balanced ecological carrying capacity and its understanding are important to achieve sustainable development for human kind.Here,the concept of ecological carrying capacity has been used for measuring the dependencies between human and nature.China’s ecological balance between supply and demand has become a global concern and is widely debated.In this study the ’Ecological Footprint’ method was used to analyze the supply-demand balance of China’s ecological carrying capacity.Firstly,the ecological supply and demand balance was calculated and evaluated,and secondly,the ecological carrying capacity index (ECCI) was derived for each county of China in 2007,and finally this paper systematically evaluated the ecological carrying capacity supply-demand balance of China.The results showed that ecological deficit appeared to be the main characteristic of ecological carrying capacity supply-demand balance in 2007 of China at county scale.In general,more than four-fifths of the Chinese population was concentrated in less than one-third of the land area and more than two-thirds of the land area was inhabited by less than one-fifth of the population.The spatial distribution of the ecological carrying capacity demand-supply was unbalanced ranging from significant overloading to affluence from southeastern to northwestern part of China.It appeared to be more dominant in regions located at coastal areas which are attracted by migrants and had a generally higher population density.Along with the rapid development and urbanization trends in China,ecological deficits in these regions will become more severe. 相似文献