甘肃省人口空间分布特征分析

Analysis of the spatial distribution of the population in Gansu Province

利用甘肃省乡镇人口统计数据和行政村、自然村居民点数据,基于GIS技术对甘肃省人口数据进行空间化,并进行人口空间分布特征和灾害风险分析.结果表明,甘肃省人口空间分布具有显著的条带状分布特征,从甘肃中东部片状高集聚区向西部发散,沿着河西走廊向西延伸,间断分布,河西走廊人口主要分布于市州政府所在地;甘肃省约有62.37%的国土面积上没有人口分布,在全省8.32%面积的土地上,分布着64%的人口,且这些地区人口密度较大（人口密度大于200人·km-2）,其余人口分布在29.31%国土面积的土地上;甘肃省人口受地形影响较大,人口主要分布在地形条件较好的地方,在低海拔区域（1 000～2 000m）分布着全省68.96%的人口,低坡度（0°～30°）区域,分布着全省92.45%的人口,但是在地形较差的地方也分布着一定的人口,这些地区往往是地质灾害高发区,如陇南地区、舟曲、祁连山区等,灾害风险程度较高.

Based on the GIS technology, population data of villages and towns as well as administrative village settlement of Gansu Province, the space distribution characteristics is analyzed aiming to provide a basic data for natural disaster risk assessment. Results show that the spatial distribution of population in Gansu Province has significant characteristics of zonal distribution. Population distributes densely in the middle east and diverges to the west of Gansu, disjunction extendes to west along the Gansu Corridor. In Gansu Corridor, population mainly distributes in the areas where the cities and state governments are located. There is no population distribution in about 62.37% of the land area in Gansu. About 64% of the population distributes in 8. 32% of the province area which causes high population density （with population density more than 200 people/km2） , and the rest of the population distributes in 29.31% of provincial area. Influenced greatly by landform of Gansu, population mainly distributes in the areas where terrain conditions are rather better. 68.96% of the population distributes in low altitude places（1 000～2 000 m） and 92.45% distributes in low-slope areas between 15°-25°. However, a certain amount of population also distributes in rough higher degree of disaster risk, such ter as rain where suffering from s Southern Gansu, Zhouqu, erious geological hazards and facing with Qilian Mountain.