College of Resources and Environment, State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, Southwest University, Chongqing 400715, China.
Chongqing Jinfo Mountain Field Scientific Observation and Research Station for Kaster Ecosystem, Ministry of Education, Southwest University, Chongqing 400715, China.
Int J Environ Res Public Health. 2020 May 14;17(10):3416. doi: 10.3390/ijerph17103416.
Exploring the coupling relationship between urban land and carbon emissions (CE) is one of the important premises for coordinating the urban development and the ecological environment. Due to the influence of the scale effect, a systematic evaluation of the CE at different scales will help to develop more reasonable strategies for low-carbon urban planning. However, corresponding studies are still lacking. Hence, two administrative scales (e.g., region and county) in Chongqing were selected as experimental objects to compare and analyze the CE at different scales using the spatiotemporal coupling and coupling coordination models. The results show that urban land and carbon emissions presented a significant growth trend in Chongqing at different scales from 2000 to 2015. The strength of the spatiotemporal coupling relationship between urban land and total carbon emissions gradually increased with increasing scale. At the regional scale, the high coupling coordination between urban land and total carbon emissions was mainly concentrated in the urban functional development region. Additionally, the high coupling coordination between urban land and carbon emission intensity (OI) was still located in the counties within the metropolitan region of Chongqing, but the low OI was mainly distributed in the counties in the northeastern and southeastern regions of Chongqing at the county level. This study illustrates the multiscale trend of CE and suggests differentiated urban land and carbon emission reduction policies for controlling urban land sprawl and reducing carbon emissions.
探索城市土地与碳排放（CE）的耦合关系是协调城市发展与生态环境的重要前提之一。由于规模效应的影响，对不同尺度的 CE 进行系统评价有助于为低碳城市规划制定更合理的策略。然而，相应的研究仍然不足。因此，选择重庆市的两个行政尺度（如区域和县级）作为实验对象，利用时空耦合和耦合协调模型对不同尺度的 CE 进行比较和分析。结果表明，2000 年至 2015 年，重庆市不同尺度的城市土地和碳排放呈显著增长趋势。城市土地与总碳排放量之间的时空耦合关系强度随着尺度的增加而逐渐增强。在区域尺度上，城市土地与总碳排放量之间的高耦合协调主要集中在城市功能发展区。此外，在重庆大都市区的县城，城市土地与碳排放强度（OI）之间仍存在高耦合协调，但低 OI 主要分布在重庆东北部和东南部的县城。本研究说明了 CE 的多尺度趋势，并为控制城市土地扩张和减少碳排放提出了差异化的城市土地和碳排放减排政策。
