成武县土地利用时空变化与水系因子的关系研究

Study on the Relationship between Spatio-temporal Change of Land Use and Warter System Factor in Chengwu County

摘要:

成武县位于鲁西南黄河冲积平原区，水系发达，地表水资源丰富。为了分析地表水系对成武县土地利用时空变化和空间格局的影响，该文基于不同时期的遥感影像，结合实地调查和专家意见，提取区域土地利用现状图；运用DEM地表水文分析提取河流汇流累积量、水流长度、河流网络等，根据流量选取了河网。以河流为中心向两侧作缓冲区，与土地利用现状图进行空间分析，得到不同距离缓冲区内的土地利用结构。与全区域土地利用结构对比，分析不同时期在相同的缓冲区域内土地利用特征和变化，总结土地结构变化规律，结合100m,200m,300m,400m,500m,750m,1000m不同的缓冲区；通过对比各种土地利用类型在不同距离缓冲区的时空变化，从而分析水系因子对不同土地类型时空变化的影响。结果表明，不同距离缓冲区内土地利用结构不同，随着缓冲区范围的增加，耕地、建设用地、林地、园地呈现不同的变化趋势与特点，水系因子对成武县不同土地利用方式影响程度不同，水系因素对成武县土地利用空间分异有明显影响。

Abstract:

Chengwu county is located at the alluvial plain of the Yellow River. The water system is rich and the surface water resources are abundant. In order to analyze the influence of surface water system on temporal and spatial pattern of land use in Chengwu county, based on remote sensing images of different periods, combining with field investigation and expert opinions, regional land use has been extracted. By using surface hydrology analysis based on DEM, flow accumulation, flow length and river network have been extracted. Regarding the river as the center, the buffer zones have been made. Comparing with land use map, land use structures in the buffer zone with different distances have been gained. Comparing with land use structures in the whole area, the characteristics and change of land use in the same buffer area in different periods have been analyzed, and change rule of land use has been summarized. Combining with different buffer areas with the distance of 100m, 200m, 300m, 400m, 500m, 750m and 1000m, through the constrast of.spatio-temporal change of all kinds of land use in buffer zones with different distances, the effect of water system factor to spatio-temporal change in different land types has been analyzed. It is showed that land use structure in different buffer zones in different distances is different. Accompanying with the increase of buffer areas, farmland, construction land, woodland, garden show different trends and characteristics. The influence of water factors on land use in Chengwu county are different. Water factor has obvious effect to spatial differentiation of land use in Chengwu county.