甘肃省土地利用碳排放时空演变特征及影响因素

Spatial and Temporal Evolution Characteristics of Carbon Emission from Land Use and Influencing Factors in Gansu Province

陆地生态系统是世界上最大的碳汇,而土地利用变化是导致区域碳排放变化的主要影响因素之一,通过对2000~2020年甘肃省土地利用碳排放时空演变特征和影响因素研究,为促进甘肃省土地低碳利用、低碳经济发展提供一定科学依据与参考.采用土地利用数据,结合温室气体排放系数法,研究甘肃省市域尺度土地利用碳排放增长趋势与省域尺度时空演变特征,并通过主成分分析研究其控制因素.结果表明:①2000~2020年甘肃省土地利用碳排放整体为增加趋势,由2428.93万t升至5773.96万t,其中2000~2014年第一阶段为显著增加阶段,2014~2020年第二阶段为稳定且略有降低阶段.建设用地为主要碳源,碳源强度仍呈增加态势.②空间上表现为“东高西低”的特征,河东碳排放量明显高于河西碳排放量.③根据排放特征将甘肃省划分为缓慢增长型、较慢增长型、中速增长型、较快增长型和迅猛增长型5类碳排放类型区.④经济发展水平、土地利用程度与能源消费是导致甘肃省土地利用碳排放不断增加的主要原因.

Land ecosystems are the largest carbon sink in the world,and land use change is one of the main factors leading to regional carbon emissions.By studying the spatiotemporal evolution characteristics and influencing factors of land use carbon emissions in Gansu Province from 2000 to 2020,this research aimed to provide a scientific basis and reference for promoting low-carbon land use and low-carbon economic development in Gansu Province.Using land use data and the greenhouse gas emission coefficient method,the study analyzed the growth trend of land use carbon emissions at the city-regional scale in Gansu Province,and the spatiotemporal evolution characteristics at the provincial scale,and identified the controlling factors through principal component analysis.The results showed that:①From 2000 to 2020,land use carbon emissions in Gansu Province showed an overall increasing trend,from 24.2893 million tons to 57.7396 million tons.The first stage from 2000 to 2014 was a significant increase period,whereas the second stage from 2014 to 2020 was a stable and slightly decreasing period.Construction land was the main carbon source,and the carbon intensity continued to increase.②Spatially,there was an"east high,west low"pattern,with carbon emissions in the eastern part of the province significantly higher than those in the western part.③Based on emission characteristics,Gansu Province could be divided into five types of carbon emission zones:slow growth,relatively slow growth,moderate growth,relatively fast growth,and rapid growth.④The main reasons for the continuous increase in land use carbon emissions in Gansu Province were economic development level,degree of land use,and energy consumption.