Abstract: The optimization model of land use structure in Gongyi City aiming at low carbon emission was established. The effects of land use structure optimization and land use efficiency change on carbon storage in Gongyi City were studied by the scenario simulation method. The results showed that,① from 2011 to 2018, the area of all land use types in Gongyi City showed significant changes, which resulted in significant changes in carbon storage. In 8 years, the carbon storage of cultivated land decreased from 4 122 700 tons to 4 054 100 tons, and that of forest land and grassland also decreased by 46 700 tons and 26 400 tons, respectively. The outflow of cultivated land to construction land resulted in a significant decrease in soil and vegetation carbon stocks, with a range of 77 700 tons and 24 600 tons. It showed that the conversion of cultivated land to construction land not only reduced the carbon storage of vegetation, but also had a greater impact on soil carbon storage. ② After the optimization of land use structure, the total carbon storage of each land use type increased by 641 600 tons compared with the base period. This was an increase of 789 700 tons compared to the natural development in 2030. It showed that the optimization of land use structure could improve the regional total carbon storage when the total land area was fixed. ③ The simulation results of land use efficiency improvement scenario showed that after land use efficiency improvement of cultivated land and forest land, carbon storage of cultivated land increased by 234 000 tons, forest land increased by 1 424 300 tons, and overall carbon storage increased by 1 658 300 tons. Compared with 2030 under the state of natural development, the carbon storage of cultivated land increased by 214 100 tons, the forest land increased by 2 257 200 tons, and the overall carbon storage increased by 2 448 000 tons. It showed that on the basis of the optimization of land use structure, the improvement of land use efficiency could further increase the carbon storage of land use type. It could be seen that the optimization of land use structure and the improvement of land use efficiency could play a positive role in promoting the change of regional carbon stocks.

Key words: land use structure optimization, carbon storage capacity, carbon sequestration effect, scenario simulation, Gongyi City