Research on optimization of urban thermal environment ecological network based on MSPA and minimum cumulative resistance model
[Objective]The acceleration of urbanization leads to the change of urban underlying surface,serious landscape fragmentation,and continuous intensification of urban heat island effect,especially in the urban center where buildings and populations are highly clustered.The establishment of reasonable ecological network has become one of the important ways to improve the urban ecological environment.[Method]Based on the"source-sink"theory,this study used morphological spatial pattern analysis(MSPA)and landscape connectivity index to select the"source"and"sink"landscapes with good landscape stability and high connectivity as ecological sources in the study area.The minimum cumulative resistance model,gravity model and hydrological analysis module were used to construct and screen important ecological corridors in the study area,so as to establish a multi-level"source-sink"landscape network to alleviate urban thermal environment problems.[Result]The results showed that 24 core patches with important connectivity were selected as important ecological sources.There were 102"source-source"corridors,141"source-sink"corridors,325"source-sink"corridors,103 ecological nodes and 148 obstacle points.Through comprehensive superposition,the first-level compensation corridor was mainly composed of Minjiang River,Pihe River and other river channels,the second-level transport corridor was mainly distributed in the area with dense"sink"landscape,and the third-level action corridor was mainly distributed in the high-intensity construction area.[Conclusion]The optimization pattern of a multi-level ecological network based on the"source-sink"theory is an important measure for effectively mitigating the urban heat island effect.[Ch,4 fig.3 tab.25 ref.]
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