Comparison of the CASA and InVEST models’ effects for estimating spatiotemporal differences in carbon storage of green spaces in megacities

Abstract

Urban green space is a direct way to improve the carbon sink capacity of urban ecosystems. The carbon storage assessment of megacity green spaces is of great significance to the service function of urban ecosystems and the management of urban carbon zoning in the future. Based on multi-period remote sensing image data, this paper used the CASA model and the InVEST model to analyze the spatio-temporal variation and driving mechanism of carbon storage in Shenzhen green space and discussed the applicability of the two models to the estimation of carbon storage in urban green space. The research results showed that, from 2008 to 2022, in addition to the rapid expansion of construction land, the area of green space and other land types in Shenzhen showed a significant decrease trend. The estimation results of the carbon storage model showed that the carbon storage of green space shows a significant trend of reduction from 2008 to 2022, and the reduction amounts are 0.8 × 106 t (CASA model) and 0.64 × 106 t (InVEST model), respectively. The evaluation results of the model show that, in megacities, the spatial applicability of InVEST model is lower than that of CASA model, and the CASA model is more accurate in estimating the carbon storage of urban green space. The research results can provide a scientific basis for the assessment of the carbon sink capacity of megacity ecosystems with the goal of "dual carbon".

Study on the variation of carbon storage in the Chang-Zhu-Tan urban agglomeration in China based on topographic relief

“…Research on changes in land use can effectively analyze its impact on carbon storage. Recently, much research based on different types of land use characteristics (Wang et al 2024a;Xue et al 2023), combined with the Lund-Potsdam-Jena-guess (LPJ-GUESS) dynamic vegetation model (Zhao et al 2014), denitrification-decomposition (DNDC) model (Musafiri et al 2021), and global production efficiency model (GLO-PEM) (Tan et al 2012), evaluates regional ecosystem carbon storage. However, these models suffer from drawbacks such as long sampling periods, complex data requirements, and large workloads (Zhu et al 2021;Jiang et al 2017).…”