基于PLUS-InVEST的池州市土地利用及碳储量时空演变分析

Spatiotemporal Evolution Analysis of Land Use and Carbon Storage in Chizhou City Based on PLUS-InVEST

探究池州市土地利用及碳储量时空变化,对合理利用土地、土地规划与开发及减少碳排放提升生态环境质量具有重要意义。以2000—2020年池州市土地利用类型为数据源,基于PLUS模型预测2030年土地利用分布数据,分析30年间池州市各土地利用类型变化趋势,并运用InVEST模型计算不同时期碳储值,分析池州市碳储量的时空变化。结果表明:2000—2030年池州市的土地利用变化显著,耕地、水域、人造地表面积总体呈增加趋势,林地、草地、未利用地呈减少趋势,其中人造地表面积增加最多,增加了154.02km2,林地面积减少最多,减少了200.35km2;池州市碳储量呈先下降后升高趋势,总体为减少趋势,共减少了4.85×106t;4个时期林地和耕地的碳储量占比最高,林地转出使得碳储量减少1.46×107t,耕地转出增加了4.67×106t。2000—2030年池州市土地利用类型发生显著变化,各地类之间的相互变化影响着碳储量的变化,应加强生态环境保护提高生态系统的固碳能力。

Exploring the temporal and spatial changes of land use carbon emissions in Chizhou City is of great sig-nificance for rational use of land,land planning and development,reducing carbon emissions and improving eco-logical environment quality.Taking land use types in Chizhou from 2000 to 2020 as the data source,based on the PLUS model to predict the land use distribution data in 2030,the change trend of land use types in Chizhou in re-cent 30 years was analyzed,and the InVEST model was used to calculate the carbon storage value in different pe-riods and analyze the temporal and spatial changes of carbon storage in Chizhou.The results showed that the land use change in Chizhou City from 2000 to 2030 was significant.The area of cultivated land,water area and artifi-cial surface showed an overall increasing trend,while the area of forest land,grassland and unused land showed a decreasing trend.The area of artificial surface increased by 154.02 km2,and the area of forest land decreased by 200.35 km2.The carbon storage in Chizhou City showed a trend of decreasing first and then increasing,with a total decrease of 4.85×106t.The carbon storage of forest land and cultivated land accounted for the highest proportion in the four periods.The transfer of forest land reduced the carbon storage by 1.46×107 t,and the transfer of cultivated land increased by 4.67×106 t.From 2000 to 2030,the land use types in Chizhou City have changed significantly,and the mutual changes between different land types affect the changes of carbon storage.Therefore,it is necessary to strengthen the protection of ecological environment and improve the carbon sequestration capacity of ecosys-tem.