摘要
研究城市群建成区绿色基础设施对PM_(2.5)的消减效应,有助于为城市群应对气候变化采取的可持续发展战略提供理论支撑。以长江中游城市群建成区为例,基于2000—2020年建成区面积数据、土地覆盖数据以及PM_(2.5)数据系统分析城市群PM_(2.5)浓度的时空演变特征,以林地、草地、耕地、湿地、水体等5种绿色基础设施为驱动因子,采用地理探测器模型中的因子探测与交互作用探测,探索城市群建成区绿色基础设施对PM_(2.5)浓度的削减效应。同时,结合夜间灯光数据以及约束线方法,进一步剖析城市化水平对建成区绿色基础设施的约束效应。结果表明:(1)2000—2020年期间,长江中游城市群年均PM_(2.5)浓度在时序上呈现先升后降的“倒U型”趋势,在空间上呈现由西北向东南级差化递减的分异特征。(2)2000—2020年期间,长江中游城市群建成区绿色基础设施对PM_(2.5)存在削减效应,但历年削减率均不超过4%,其中扩张区的削减效应显著高于老城区。(3)因子探测结果表明,长江中游城市群各绿色基础设施因子对PM_(2.5)浓度的解释力在老城区总体呈现出林地>草地>耕地>湿地、水体的规律,而在扩张区呈现出林地>草地>耕地、水体>湿地的规律;交互作用探测结果表明,林地与湿地、林地与草地、林地与水体是削减PM_(2.5)浓度较为显著的交互组合,其交互解释力在老城区与扩张区均达到0.5以上。(4)长江中游城市群建成区绿色基础设施对PM_(2.5)浓度的削减效应受到城市化水平约束,其约束线形态在老城区与扩张区均为指数型。本研究有助于在城市群尺度为以自然为本的气候解决方案(Natural Climate Solutions, NCS)的落实提供依据。
Studying the reduction effect of green infrastructure on PM_(2.5) can provide theoretical support for sustainable development strategies to address climate change in urban agglomeration.First,taking the built-up areas of urban agglomeration in the Yangtze River′s middle reaches as an example,this study systematically examined the spatiotemporal evolution characteristics of PM_(2.5) concentration in urban agglomeration from 2000 to 2020 using built-up area data,land cover data,and PM_(2.5) data.Second,we took five types of green infrastructure,including woodland,grassland,cultivated land,wetland,and waters,as driving factors and employed the factor detection and interaction detection functions in the geographic detector model to explore the reduction effects of green infrastructure on PM_(2.5) concentration in the built-up area of urban agglomeration.Third,this study further analyzed the constraint effect of urbanization level on green infrastructure in the built-up areas by combining nighttime lighting data and the constraint line method.The results show that:(1)during 2000—2020,the annual average PM_(2.5) concentration of the urban agglomeration in the Yangtze River′s middle reaches showed an“inverted U-shaped”trend of rising and then decreasing in time series,and the spatial divergent characteristics of decreasing from the northwest to the southeast.(2)During 2000—2020,the green infrastructure in the built-up areas of the urban agglomeration in the Yangtze River′s middle reaches had a reduction effect on PM_(2.5) concentration,and the reduction rate did not exceed 4%.The reduction effect of the expansion area was significantly higher than that of the old urban areas.(3)The results of factor detection showed that in the urban agglomeration in the Yangtze River′s middle reaches,the explanatory power of each green infrastructure factor on PM_(2.5) concentration showed a pattern of woodland>grassland>cultivated land>wetland and waters in the old urban area and a law of woodland>grassland>cultivated land and waters>wetland in the expansion area.The results of interaction detection showed that woodland and wetland,woodland and grassland,and woodland and waters were the most significant interaction combinations to reduce PM_(2.5) concentration,and their interaction explanatory power reached above 0.5 in both the old urban area and the expansion area.(4)The reduction effect of green infrastructure on PM_(2.5) concentration in the built-up areas of the urban agglomeration in the Yangtze River′s middle reaches was constrained by the urbanization level.The shape of the constraint line was exponential in both the old urban area and the expansion area.This study can provide a basis for the implementation of Natural Climate Solutions(NCS)at the urban agglomeration scale.
作者
方云皓
赵丽元
窦碧莹
王书贤
周枞
FANG Yunhao;ZHAO Liyuan;DOU Biying;WANG Shuxian;ZHOU Cong(School of Architecture and Urban Planning,Huazhong University of Science and Technology,Wuhan 430074,China;Jiangning Branch,Nanjing Municipal Bureau of Planning and Natural Resources,Nanjing 211199,China)
出处
《生态学报》
CAS
CSCD
北大核心
2024年第1期117-128,共12页
Acta Ecologica Sinica
基金
中央高校基本科研业务费专项资金项目(2023WKZDJC009)
武汉研究院开放性课题(IWHS20211011)。
关键词
绿色基础设施
PM_(2.5)
削减效应
约束效应
地理探测器
长江中游城市群
green infrastructure
PM_(2.5)
reduction effect
constraint effect
geographical detector
urban agglomerations in the middle reaches of the Yangtze River
