OALib Journal期刊
ISSN: 2333-9721
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城市景观格局尺度效应的空间统计规律——以上海中心城区为例
DOI: 10.11821/xb200406030, PP. 1058-1067
Keywords: 城市景观,尺度效应,空间自相关,Shannon多样性指数,半变异函数,上海
Abstract:
以上海市外环以内的中心城区为区域背景,基于SPOT全色波段遥感影像数据和GIS技术,运用空间统计分析方法,研究城市景观格局的空间尺度效应。研究结果表明(1)城市景观格局的空间自相关性具有显著的尺度依赖性。Moran指数I与Geary系数c对粒度变化的敏感点相同,均为50m。(2)城市景观形态具有分形特征,各类景观斑块的分维数对粒度变化的响应不同,它们随着粒度的变化呈非线性变化趋势;在粒度较小时,各类景观斑块之间的分维数差异较大,而随着粒度的增大,其分维数之间的差异逐渐缩小。(3)城市景观多样性格局,与空间区位及人类活动的空间格局息息相关。在城市中心,主导型景观是经济效益较高的商业文化景观,并且景观斑块聚集度、破碎度大;经济效益较低的农业景观分布在城市边缘区,而且景观类型单一,斑块面积较大,破碎度较小;在由城市中心向边缘过渡的中间地带,景观类型多样,空间格局复杂。(4)景观多样性具有尺度依赖性。随着幅度的增加,景观多样性指数逐渐增大,多样性的空间格局也显著变化。在0.5km幅度下,多样性指数的最大值出现在市中心,从市中心向外呈现高低起伏的环状模式扩展,随着幅度增加,多样性指数的高值区向景观类型变化最剧烈的城乡过渡地带转移。(5)景观多样性的空间变异也具有明显的尺度依赖性。在较小幅度下,总体空间变异主要来自空间自相关的贡献,随机因素贡献较小;而较大幅度掩盖了更小尺度上的变异,导致块金效应增强,总体空间变异中自相关部分的贡献明显下降。
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