碳中和目标下的广西边境地区“三生”空间转型及碳储量效应

Transition of Productional-Living-Ecological Space and Carbon Storage Effect in Guangxi Border Area Under Carbon Neutrality Goal

[目的]系统分析“三生”空间转型下的碳储量效应,以期优化空间布局与提升边区生态系统固碳能力,助推国家实现“碳中和”的战略目标。[方法]采用“三生”空间动态度、“三生”空间转移矩阵刻画边境“三生”空间分布格局和转型特征,借助InVEST模型和“三生”空间碳储量贡献率揭示边境1990—2020的碳储量时空分异及“三生”空间转型对碳储量的影响。[结果]①1990—2020年边境地区以绿被生态空间占绝对主体,农业生产空间和水域生态空间为辅的组合特点,分布上呈现“南北两翼高,中部低”特征。②研究期内边境地区“三生”空间转型呈现出初期稳定、中期波动、后期剧烈的发展态势,除水域生态空间外,其余空间均于2010—2020年动态度变化最为显著。③1990—2020年,边境地区碳储量整体呈现逐期持续递减,研究初期与中期变动幅度不大,末期碳储量深刻变化;40 a间碳储量共计损失4.13×10^(6)t,绿被生态空间与农业生产空间的相互转换主导着广西边境地区碳储量的变化。[结论]应调整与优化区域“三生”空间用地结构,促进“三生”空间融合,并以“碳中和”为目标导向,强化空间用途管制,为提升区域碳储资源提供精确保障。

[Objective]The effect of carbon storage under the transition of the productional-living-ecological space was systematically analyzed in order to optimize the spatial layout and increase the carbon sequestration capacity of the Guangxi border area ecosystem so that the strategic goal of“carbon neutrality”could be achieved in China.[Methods]This study used a land change dynamic attitude model and land use transfer matrix to describe the spatial distribution pattern and transformation characteristics of the productional-living-ecologyical space along the Guangxi border.Based on the InVEST model and the contribution rate of productional-living-ecologyical space carbon storage,the spatio-temporal variation of carbon storage and the impact of the productional-living-ecologyical space transition on carbon storage in the border area during 1990—2020 were determined.[Results]①From 1990 to 2020,the border area was dominated by green ecological space,supplemented by agricultural production space and water ecological space,with a distribution pattern of“high in the north and south regions,and low in the central region”.②During the study period,the transition of the productional-living-ecological space in the border area showed a stable development in the early stage,fluctuating development in the middle stage,and drastic development in the late stage.Except for the ecological space of the water area,the change of dynamic attitude in other areas was most significant from 2010 to 2020.③From 1990 to 2020,overall carbon storage in the border area showed a continuous decline over time,with a small change in the early and middle stages,and a profound change in the late stage.In the past 40 years,a total of 4.13×10^(6)t of carbon storage has been lost.The conversion of green ecological space and agricultural production space dominated the change of carbon storage in the Guangxi border area.[Conclusion]It will be necessary to adjust and optimize the land use structure of regional productional-ecological space,promote the integration of productioal-ecological space,and strengthen the regulation of space use with the goal of“carbon neutrality”so as to accurately guarantee improvement of regional carbon storage resources.