人类活动干扰下土地利用强度异质性特征分析——以中山市为例

Characterizing Land Use Spatial Heterogeneity Driven by Human Activities: A Case Study in Zhongshan City

以广东省中山市为例,在土地利用类型遥感解译数据的基础上,以系统网格采样法计算研究区内土地利用强度,并探索了土地利用强度的空间分布特征,以及受人类活动的驱动作用。结果表明,1 200 m尺度能够很好地反映土地利用强度异质性在空间上的特征;研究区内的土地利用强度空间分布表现出较强的正自相关性,2000—2010年,中山市土地利用强度分布模式由多点式向极化转变,并且表现出核心区域的扩散效应;从整体的范围上看,土地利用强度的空间异质性受尺度影响,随着尺度的增加各向同性的减弱,转变成明显的各向异性;研究区内自然条件以及区域发展政策的差异,导致研究区内行政单元间的土地利用强度空间分异明显;在人类活动影响的驱动下,研究区内土地利用强度异质性呈现增强的趋势。

With a case study in Zhongshan city and based on remote sensing interpretation data of land uses,the land use intensity was calculated using the method of system grid sampling, and the spatial distribution characteristics of land use intensity as well as the driving functions of human activities explored. The results showed that the spatial scale of 1 200 m could well reflect the spatial heterogeneity characteristics of land use intensity. The spatial distribution of land use intensity in the research area showed a strong positive correlation; from 2000 to2010,the distribution patterns of land use intensity transformed from the multipoint to polarization,showing the diffusion effect of the core region. On the whole,the spatial variation of land use intensity was affected by the scale,and the isotropy was weakened and transformed into obvious anisotropy with the increase of scale. The difference of natural conditions and regional development policies led to obvious differentiation of land use intensityamong various administrative units. Driven by human activity influences,the land use intensity heterogeneity showed the tendency of increase in the research area.