关键词: 松嫩高平原, 县域, 土地利用空间格局, 地形梯度

Abstract:

The purpose of this article is to explore the relationship between spatial distribution of land use and topographic factors and provide new ideas for regional land use planning. The study area of this study is Bayan County, Heilongjiang Province, in Northeast China. Three kind of topographic factors are extracted, which are elevation, slope and aspect, based on the DEM data of research area by the utilizing of GIS. The distribution characteristics of different kind of land use type among different topographic factors are identified after the classification of the three topographic factors which were extracted. Based on that, distribution index of land use type among different topographic factors are calculated, including the information entropy, equilibrium degree, dominance degree of land use structure and the correlation coefficient between different land use style and topographic factors. So that, the relationship between spatial distribution of land use and topographic factors could be identified. The results show that: 1) The spatial distribution of land use in research area shows gradient feature due to the impact of topographic factors. There are more dry land, paddy field, grassland, water area, construction land and other land in the region of low level of terrain, but more forest land in the region of high level of terrain. 2) Except forest land, the dominant landforms of other land use types are located at lower levels, and the predominant terrain of forest land distributed in the area of high level of topographic factors. The dominance regions of different land use types are different. The dominant region of dry land is the central and northwest region of the study area, the dominant region of paddy field is the southern edge of the study area, the dominant area of forest land is the northeast and southeast of the study area, the dominant region of construction land is the south of the study area, the dominant area of grassland is the northwest and the southern edge of the study area, the dominant region of water area is the southern edge of the study area and the dominant area of other land is in the south of the study area. 3) The degree of order, equilibrium and dominance of land use structure in the study area have a certain gradient under the function of topographic factors. The information entropy and equilibrium degree of the land use structure show the same changing trend, the values of information entropy and equilibrium degree of the land use structure are larger in the area of low level of elevation and slope. The trend of dominance is opposite to the information entropy and equilibrium, the dominance value of single land use type is higher in the area of high level of elevation and slope. Thus, the distribution of land use types are significantly correlated with topographic factors.

Key words: Songnen High Plain, county level, spatial pattern of land use, terrain gradient