Study On The Spatiotemporal Dynamic Changes Of Land Use And Its Carbon Sequestration Potential In Mengjiang National Wetland Par

Wetlands,one of the three major ecosystems on Earth,have been classified as a Class I land category under the latest land classification standard.They have a crucial role to play in the regional carbon cycle and are instrumental in mitigating global climate change.To achieve the national goal of "double carbon" and increase the capacity of wetland ecological carbon sinks,it is essential to focus on constructing and managing wetlands in a scientific manner.Mengjiang National Wetland Park,designated as one of the important wetlands by Guizhou Province,boasts abundant wetland,plant,and animal resources and can provide carbon sink services for the region’s ecosystem.This article focuses on the Mengjiang National Wetland Park located in Luodian County,Guizhou Province,and aims to extract land use data for five different time periods ranging from 2000 to 2020.To achieve this,the study employs various methods including the random forest classification algorithm on the Google Earth Engine(GEE)cloud platform,land use transfer matrix,and land use dynamic attitude model correlation analysis.The results of the study show that the three main land types in the park are watershed,woodland,and grassland.The extent of the watershed plays a crucial role in determining the distribution of woodland and grassland,with fluctuations in the water level line of the watershed having a significant impact on their respective extents.The INVEST model’s Carbon Storage and Sequestration module was utilized to assess the carbon storage of Mengjiang National Wetland Park.This was achieved by combining land use data with updated data on the four fundamental carbon pools.The findings were visualized and presented using the Arc Map platform.The results indicate that the total carbon sequestered by Mengjiang National Wetland Park in2000,2005,2010,2015,and 2020 were 53311.56 t,57274.91 t,41590.33 t,41,265.06 t,and 40576.32 t,respectively.These stocks have been affected by the expansion of construction land,resulting in a trend of initially increasing and then decreasing stocks.Geographically,the areas with high carbon stock values are mostly found in the woodlands and grasslands,while the water area and plots of land primarily contain low carbon stock values.The study results remain consistent with the original meaning.The Habitat Quality Model of the In VEST model was utilized to assess the impact of threat sources on the quality of the habitat.The analysis revealed that the mean values of habitat quality in Mengjiang National Wetland Park between 2000 and2020 were 0.863,0.861,0.846,0.860,and 0.843,respectively.Although there was no clear trend in the high value of habitat quality in the study area from a spatial perspective,the impact of human activities on habitat quality is gradually expanding.Therefore,the management and protection of the restoration and rehabilitation areas should be given top priority in the wetland park.Based on the results of carbon sequestration potential and habitat capacity zoning,the integrated potential areas in Mengjiang Wetland Park are primarily situated along the river zone in the study area and in the restoration and reconstruction area.Hence,it is crucial to pay special attention to the protection and development of the potential areas,their ecosystem functions,and biodiversity,to promote the sustainable development of Mengjiang Wetland Park.According to the results obtained from utilizing a combination of the In VEST and CA-Markov models to predict and analyze carbon storage in the study area in2030,the Mengjiang National Wetland Park region has the potential to increase its ability to sequester carbon through the implementation of an ecological preservation scenario.The carbon storage value under the ecological protection scenario was found to be 1522.04 t greater than that under the natural development model.Based on the assessment of national wetland carbon storage and the analysis of carbon storage potential,this study provides recommendations for proactively achieving carbon peaking,maintaining the existing land use patterns,and ensuring the sustainable regional carbon balance of national wetland parks.