摘要
土地利用变化是影响区域碳排放的关键因素之一,研究土地利用碳排放时空格局变化,对合理配置土地资源、提高土地利用效率、实现节能减排具有重要意义。基于宁夏1990—2020年22个县域单元土地利用和能源数据,综合应用碳排放风险指数和碳足迹压力指数分析了宁夏各县土地利用变化和碳排放空间分异及土地利用碳排放风险。结果表明:(1)1990—2020年宁夏土地利用变化较为强烈,建设用地动态度最大,面积增加了1578.48 km^(2)。(2)近30 a宁夏土地利用碳排放量净增加了4969.25×10^(4)t,其中建设用地碳排放占碳排放总量的比例超过86%;碳吸收增加了23.76×10^(4)t,以林地碳吸收为主,占碳吸收总量的75%以上,呈局部集聚、整体分散的格局。(3)宁夏各县区土地利用碳排放呈增加态势,但差异较大,空间上形成沿黄县区碳排放量高于中、南部各县区的分布格局。(4)宁夏各县区土地利用碳排放风险和压力较大,生态系统碳平衡失调。
Land use changes considerably influence carbon emissions and carbon storage,rendering an investigation into the spatial and temporal patterns of carbon emissions from land use transformations is essential.Such a study holds great importance to the rational allocation of land resources,the improvement of land use efficiency,and the realization of energy saving and emission reduction.Herein,based on land use and energy data from 1990—2020 in 22 county units in Ningxia Province,China,we comprehensively applied the carbon emission risk index and carbon footprint pressure index to analyze land use changes,spatial differentiation of carbon emissions,and carbon emission risk associated with land use of counties in Ningxia.The results are as follows:(1)Land use change in Ningxia has been substantially strong from 1990 to 2020.Notably,the dynamic degree of construction land was the largest,with an increase of 1578.48 km^(2).(2)During this period,the net carbon emissions of land use in Ningxia increased by 4969.25×10^(4) t.Notably,net carbon emissions exhibited an average annual growth rate of 15.71%from 2000 to 2020,nearly doubling every decade.Meanwhile,the carbon emissions of construction land account for>86%of the total carbon emissions.The amount of carbon absorptions in Ningxia increased by 23.76×10^(4) t,mainly forest carbon absorptions,accounting for>75%of the total carbon absorptions,showing a pattern of local agglomeration and overall dispersion.(3)The land use carbon emissions of each county showed an increasing trend but with a profound difference.Northern counties experienced the most pronounced growth rate of carbon emissions,and the spatial distribution pattern of carbon emissions of the counties along the Yellow River was higher than that in the central and southern counties.(4)Each country suffers from high risk and pressure of land use carbon emissions,where carbon emissions and carbon absorption are highly uncoordinated,leading to an imbalance in the ecosystem carbon balance.
作者
贾科利
李小雨
魏慧敏
刘瑞亮
李浩宇
杨思雨
JIA Keli;LI Xiaoyu;WEI Huimin;LIU Ruiliang;LI Haoyu;YANG Siyu(College of Geographical Sciences and Planning,Ningxia University,Yinchuan 750021,Ningxia,China)
出处
《干旱区地理》
CSCD
北大核心
2023年第11期1757-1767,共11页
Arid Land Geography
基金
宁夏自然科学基金(2022AAC03119)
国家自然科学基金(42061047)资助。
关键词
土地利用
碳排放
碳排放风险
压力指数
宁夏
land use
carbon emission
carbon emission risk
pressure index
Ningxia
