Research On The Temporal And Spatial Changes Of Carbon Storage In Resource-based Cities Based On The InVEST Model

Research on terrestrial ecosystem carbon storage and its changes is one of the focuses of the current global climate change research.The change of land use types is the key factor affecting the carbon cycle of terrestrial ecosystems.Human activities have an impact on terrestrial ecosystem carbon stocks,mainly by changing the types of land use and thus the natural ecological processes.As a typical mineral resource-based city,the change of land use types caused by mining activities has its own characteristics.So studying the relationship between land use change and terrestrial ecosystem carbon storage resource type city,reveals the regional carbon stock change characteristic can provide the basis for the optimization of regional land use structure and promote the harmonious development of economic society and ecological construction.Based on the three remote sensing images of 1995,2005 and 2015,this paper qualitatively and quantitatively analyzes the effect of land use change on carbon storage in the study area from 1995 to 2015,through the eCognition,ArcGIS and the carbon module of InVEST.The main conclusions are as follows:(1)The change of land use in the study area is obvious.Land use type area data,land use transfer matrix and land use change map analysis of temporal and spatial variability of land use in the research area.In terms of the quantity structure,the area of cultivated land and unused land is reduced,and the area of woodland,grassland,water and construction land is increased.From the perspective of spatial distribution,the increase of woodland is mainly distributed in the eastern region,the water in the northwestern region is obviously increased,and the construction land is gradually expanding in the central region.(2)Utilize the land use classification map of the study area and the carbon density of each area parameters,estimated carbon storage in the study area by the carbon module of InVEST,and discussed the temporal and spatial variation characteristics of carbon storage.The results show that the total carbon sequestration in the study area from 1995 to 2015 was 33.58 t,showing the carbon sink area,and the carbon sequestration ability showed the trend of first and later slowing.In space,the imbalance of land use changes results in the spatial distribution of carbon reserves.The carbon sinks are mainly distributed in the southwest and eastern regions,and the carbon source regions are mainly distributed in the central and northwestern regions.(3)Analysis of relationship between land use change and carbon stock.Carbon storage and carbon fixation of different land use types capacity is consistent with the carbon density of various regions.The inter conversion between different regions will affect the carbon storage in the whole region.Based on the characteristics of the development of mineral resources-based cities,the research area is mainly characterized by construction land and water areas with low carbon density values that invade occupied farmland and forest land with high carbon density values,thus limiting the improvement of the overall carbon storage level in the study area.(4)Based on the impact of land-use change on carbon storage in terrestrial ecosystems,to fully understand the relationship between the two,at the same time,the use of low-carbon oriented land use structure optimization methods to improve the carbon sequestration capacity of the ecosystem in the study area through the transformation of land use types will be of reference significance for the development of a reasonable planning scheme for the study area and the improvement of ecosystem service value.