摘要
蓝绿空间是城市生态安全的重要保障。本文通过谷歌地球引擎(GEE)提取2005、2010、2015与2020年的植被与水体指数数据,构建了包含272个地级城市建成区的蓝绿空间数据库。运用蓝绿空间覆盖率、300 m服务半径覆盖率、分维数与分离度4个指标分析其时空格局与演化模式,并进一步探讨其气候影响因素。结果表明:(1)地级城市建成区蓝绿空间整体呈现为“南高北低”的格局,且南方“西高东低”、北方“东高西低”,但环渤海地区为蓝绿空间覆盖率“洼地”;时间格局为“总体增长、局部降低”,华中地区呈下降趋势的城市最多;(2)就分区而言,西南地区城市建成区蓝绿空间覆盖率最高(平均高于65%)、分离度最低(平均低于0.60),西北地区覆盖率分异较大,华北地区覆盖率最低(平均10%~30%)且分离度最高(平均约0.98);(3)采用多尺度地理加权回归模型所得R^(2)为0.85(校正R^(2)为0.83),其中,降水量对城市建成区蓝绿空间的影响最显著,降水量变化成正相关,气温则成负相关;整体上气候影响与比人为影响相当,但在某些时段间更大。
Blue-green space plays a prominent role in urban ecological security.This study built a blue-green database of 272 prefecture-level urban built-up areas in China using NDVI and MNDWI in 2005,2010,2015,and 2020 based on Google Earth Engine(GEE).Combining with the coverage rate,300-meter service coverage rate,the fractal index distribution,and the landscape division index,the spatiotemporal pattern of the blue-green space and its climate factors were examined.The results show that:(1)The blue-green space in urban built-up areas in prefecture-level cities presented an overall pattern of“higher coverage in south than that in north”.While the south showed a pattern of“higher in west than east”,and the north had a pattern of“higher in east than west”.Particularly,the Bohai Rim area was marked as a basin of low coverage.The temporal trend of overall blue-green space was increasing except for a few cities in Central China;(2)In terms of different zones,the highest coverage rate(>65%)of blue-green space in urban built-up areas occurred in Southwest China where the landscape division index was the lowest(<0.60),and the coverage rate of Northwest China varied greatly.The North China indicated the lowest coverage(10%~30%)of blue-green space and a highest landscape division index(~0.98);(3)Based on the Multi-scale Geographically Weighted Regression(MGWR),the Rsquare value and the adjusted R-square value were 0.85 and 0.83,respectively.The impact of precipitation on the blue-green space coverage in urban built-up areas was significant and positive,while the temperature had negative impact on blue-green space.The impacts of climate factors were mostly equivalent to human activities but were stronger in certain periods.
作者
张歆越
高晓路
柴琪
宋敦江
ZHANG Xinyue;GAO Xiaolu;CHAI Qi;SONG Dunjiang(Key Laboratory of Regional Sustainable Development Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;Land Satellite Remote Sensing Application Center,Ministry of Natural Resources,Beijing 100048,China;Institute of Science and Development,Chinese Academy of Sciences,Beijing 100190,China;School of Architecture,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《地球信息科学学报》
CSCD
北大核心
2023年第1期190-207,共18页
Journal of Geo-information Science
基金
国家自然科学基金项目(41871171、41471338)
中国科学院A类战略性先导科技专项(XDA23100302)。
关键词
蓝绿空间
城市建成区
时空格局
谷歌地球引擎(GEE)
气候因素
多尺度地理加权回归
blue-green space
urban built-up area
spatial-temporal pattern
Google Earth Engine(GEE)
climate factors
multiscale Geographically Weighted Regression(MGWR)
