【摘要】 针对超大型城市建设对景观生态格局及其变化定量研究的应用需求,基于多时相遥感变化监测和格网划分方法,结合景观指数对北京景观空间格局及动态变化进行定量分析,同时探究城市化对城市景观影响的阈值效应。结果表明:1)2000—2015年,由于北京城市化水平逐渐提高,导致建筑用地增加了56%,斑块破碎程度较低;而城市耕地及绿地景观有所减少、斑块分布不均,破碎程度上升;2)空间格局方面,由于建筑用地的覆盖及彼此间的高度连接,使城区景观破碎程度明显低于城郊,景观多样性水平呈下降趋势;3)回归分析表明城市化对城市景观破碎度有显著影响,相关系数达0.84,具体表现为倒U关系,即景观破碎度随城市化水平的提高呈先上升后下降的关系,城市化水平在51%～53%时达到峰值。更多还原

【Abstract】 In view of the application of mega-city region construction to the landscape ecological pattern and its quantitative research,Beijing City was taken as research object.Landscape index was combined to quantitatively analyze the spatial pattern and dynamic changes of Beijing landscape.The threshold effect of urbanization on urban landscape was explored based on multi-temporal remote sensing change detection and grid partitioning method.The results showed that:1)From 2000 to 2015,because of the gradual increase in the level of urbanization,there was a56%increase in Beijing’s building land and a relatively low degree of plaque fragmentation.Meanwhile,urban cultivated land and Greenland were unevenly distributed and the fragmentation was increased.2)In the aspect of spatial pattern,because of the coverage and the high degree of connection of building land,the landscape fragmentation degree of the urban area was obviously lower than that of the suburb area,and the landscape diversity level was declining.3)The regression analysis showed that urbanization had a significant impact on the degree of urban landscape fragmentation with a correlation coefficient of 0.84,which was expressed as an inverted U relationship.In other words,the landscape fragmentation first rose and then declined with the urbanization level increasing,and it reached the peak when the urbanization level was between 51% and 53%.更多还原