西藏一江两河地区人口分布与地形要素关系分析

发布时间：2018-03-12 10:29

本文选题：公里网格　切入点：人口分布　出处：《地球信息科学学报》2017年02期 　论文类型：期刊论文

【摘要】：地形条件是影响区域人口分布的最基本的因素之一,本文基于1 km×1 km人口空间分布公里网格数据定量分析一江两河地区人口分布基本特征及其与高程、坡度、坡向、地形起伏度等地形要素之间的关系,有助于揭示西藏高原人口分布现状的本质、理解人口空间分布结构特征,对于今后宜居地选址、改善农牧民人居环境、制定区域经济发展政策,促进区域内人口、资源与环境可持续发展具有重要意义。研究结果表明:(1)一江两河地区90%的区域人口密度不足10人/km~2,80%的人口分布在不足5%的土地上,人口分布比较集中。当前一江两河地区有2个主要的人口集中区,分别是拉萨市城关区和日喀则地区日喀则市,拉萨市城关区尤其显著。(2)一江两河地区人口沿河分布,80.46%的人口居住在距离河流10 km以内区域,人口总数、人口密度与距河流距离呈明显的指数关系,距离河流2 km以内的区域人口密度高于50人/km~2;(3)近99%的人口分布在海拔4500 m以下,当高程超过3800 m时,人口密度随海拔升高呈下降趋势;(4)近70%的人口分布在坡度小于15°的区域,而且随着坡度越大,人口密度越小,人口分布受坡向的影响不明显;(5)地形起伏度对人口分布的影响显著,近85%的人口分布在地形起伏度小于800 m的区域,人口密度与地形起伏度之间为倒指数关系。
[Abstract]:Terrain condition is one of the most basic factors affecting regional population distribution. Based on 1 km 脳 1 km population spatial distribution km grid data, this paper quantitatively analyses the basic characteristics of population distribution and its correlation with elevation, slope, slope direction in two rivers. The relationship between topographic factors such as topographic fluctuation is helpful to reveal the essence of population distribution in Tibet Plateau, to understand the characteristics of population spatial distribution structure, to select suitable sites for living in the future, and to improve the living environment of farmers and herdsmen. It is of great significance to formulate regional economic development policies to promote the sustainable development of population, resources and environment in the region. The results show that 90% of the population density of 90% in the region of one river and two rivers is less than 10 people / km / 2 or 80% of the population is distributed on less than 5% land. The population distribution is relatively concentrated. At present, there are two main population concentration areas in the region of one river and two rivers, namely Chengguan District of Lhasa City and Xigaze City of Xigaze region. Especially in Chengguan District, Lhasa City, 80.46% of the population live in the area within 10 km from the river, and the total population, population density and distance from the river show a significant exponential relationship. The population density of the area within 2 km of the river is more than 50 people / km / 2 / 2)) the population distribution of nearly 99% is below 4 500m above sea level, and when the elevation is above 3 800 m, the population density tends to decrease with the increase of altitude) the population of nearly 70% is distributed in the area with slope less than 15 掳. Moreover, with the increase of slope, the population density is smaller, and the influence of slope direction on population distribution is not obvious. (nearly 85%% of the population is distributed in the region with topography less than 800m. The relationship between population density and topographic fluctuation is inversely exponential.
【作者单位】：中国科学院地理科学与资源研究所;中国科学院大学;
【基金】：国家科技支撑计划项目(2013BAC04B03) 国家重点研发计划项目(2016YFC0502004) 国家自然科学基金项目(41571496)
【分类号】：C922

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