Carbon conduction effect and temporal-spatial difference caused by land type transfer in Chang-Zhu-Tan urban agglomeration from 1995 to 2018

Land use carbon emission is an important factor affecting regional carbon peak and carbon neutralization. Based on land use remote sensing data and carbon emission calculation model, the carbon emission of land use in Chang-Zhu-Tan urban agglomeration from 1995 to 2018 is estimated. The temporal-spatial changes and regional differences of carbon conduction effect caused by land use transfer are analyzed by using transfer matrix, spatial relative change rate and arcgis10.2 software. The results show that: ① From 1995 to 2018, the net carbon emission from land use of Chang-Zhu-Tan urban agglomeration increased from 810.84 × 104 t increased to 2015.41 × 104 t, the carbon source / sink ratio showed an upward trend as a whole. Built-up land is the main carbon emission source, and forest and grassland are the main carbon sink. ② The carbon conduction effect caused by land type transfer in different periods was net carbon emission, which increased first and then decreased. The carbon conduction effect caused by the transfer of forest and cropland to built-up land was significant, while the carbon conduction effect caused by the transfer of grassland, water and unused land was weak. ③ Affected by the imbalance of population growth, urbanization level and economic development, the spatial distribution and change direction of regional carbon conduction effect within urban agglomeration were significantly different. The center of gravity of micro‑carbon conduction zone shifted from the northeast of urban agglomeration to the middle and south; the center of gravity of mild‑carbon conduction zone shifted from northwest and middle-west to northeast; moderate carbon conduction zone were mainly distributed in the core area of urban agglomeration, Xiangxiang city, Ningxiang city, Liling city and Youxian; the severe carbon conduction zone were mainly distributed in the north, middle and northeast of the urban agglomeration, and finally the center of gravity moved to the northwest and focused on Ningxiang city and Wangcheng district. Finally, based on the above results, some suggestions are put forward for Chang-Zhu-Tan urban agglomeration to carry out low-carbon oriented urban land use regulation.