Abstract The purpose of the study is to explore in depth the intrinsic linkage between carbon metabolism ecological relationships and national spatial utilization in the Yellow River Delta, and to provide a reference for national spatial pattern adjustment and green development. The research was based on the spatial classification system of "ecology-agriculture-urban", using the ENA-model to analyze the carbon metabolism process in the Yellow River Delta from 2000 to 2020, and using the standard deviation ellipse and the ecological relationship change rate(ERCR) to evaluate the spatial and temporal distribution and change characteristics of ecological relationships between spaces. The results of the analysis:In the Yellow River Delta, the carbon metabolism was in disorder from 2000 to 2015 due to frequent phenomena such as the occupation of ecological space by agricultural space, and the positive carbon flow increased significantly after 2015, resulting in a balanced carbon metabolism; The dominant ecological relationships in the study area were competitive, with stronger ecological conflicts over carbon metabolism, and mutualistic symbiotic relationships gradually increased in the northwest after 2015, with the priority area of national land space evolution shifted from south to north; Most of the ecological relationship change rate in the study area satisfy ERCR>0, and the scale of ecological relationship increase or decrease was consistent with the change trend of spatial transfer area. The conclusion of the study:There are still unreasonable utilization of the national space in the Yellow River Delta, and the pressure of carbon metabolism still exists, so it is necessary to further optimize the national spatial pattern and promote green development.
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