区域土地利用影响地表CO2浓度异质性特征的动力学机制

本文综合应用高斯方程和拉姆齐模型,针对京津冀地区2000年以来10 km×10 km栅格尺度的地表CO₂浓度开展研究,分析了区域土地利用影响地表CO₂浓度异质性特征的动力学机制。研究发现：① 地表CO₂浓度与土地利用类型密切相关。2000—2018年京津冀地区CO₂浓度的高值区主要集中于经济较发达的快速城镇化地区;② 土地利用强度及土地利用效率上的时空分异为地表CO₂扩散提供了潜在的势能。京津冀地区地表CO₂排放及扩散存在明显的空间异质性,距离CO₂排放高值区越近,其相应的CO₂浓度越高并随时间推移及空间拓展呈逐步减小的态势;③ 京津冀地区在土地利用结构调整、格局优化及效率提升后,CO₂排放强度增幅明显减弱,其区域间的增幅差异也逐渐缩小。产业转型发展、土地利用格局优化、土地利用效率提高有效地抑制了京津冀地区地表CO₂排放强度的提升并促进了该区域的内涵式增长与高质量发展。

Dynamics of regional land uses affecting spatial heterogeneity of surface CO2 concentration

This study analyzed the spatio-temporal variations of surface CO₂ concentration at the 10 km×10 km grid level over the Beijing-Tianjin-Hebei (BTH) region during 2000-2018 and further clarified the dynamics of regional land uses affecting spatial heterogeneity of surface CO₂ concentration based on the Gaussian diffusion equation and the spatial Ramsey model. The results showed that surface CO₂ concentration in the BTH region was closely related to land use types. The high-value areas of surface CO₂ concentration were mainly concentrated in economically developed and rapidly urbanized areas during 2000-2018. The spatio-temporal differences of land use intensity and efficiency provided potential power for surface CO₂ concentration diffusion. The surface CO₂ emission and diffusion in the BTH region had obvious spatial heterogeneity, presenting that the closer the area was to the high-value area of CO₂ emission, the higher the corresponding CO₂ concentration was, and it decreased gradually with the elapse of time and spatial expansion. Moreover, with the adjustment of land use structure, optimization of land use spatial pattern, and improvement of land use efficiency in the BTH region, the increase rate of CO₂ emissions intensity declined significantly and the differences of the increase rate among regions narrowed gradually at the same time. Industrial transformation and development, land use spatial pattern optimization, and land use efficiency improvement effectively restrained the increase of surface CO₂ emission intensity in the BTH region, and promoted the connotative growth and high-quality development of the region.