城市化进程中土地利用方式改变对土壤有机碳库的影响——以上海三林楔形绿地为例

摘要：

研究城市化进程中土地利用方式转变引起的有机碳含量变化,识别土壤有机碳的空间格局,对城镇化建设具有重要指导作用。以上海市三林楔形绿地为对象,通过遥感影像资料获取其土地利用方式和面积,并通过对不同土地利用方式的土壤进行采样,分析土地利用变化对土壤有机碳含量和密度的影响,估算三林楔形绿地拟建成后的土壤有机碳储量。结果表明:三林楔形绿地开放土壤和封闭土壤有机碳含量分别为7.51 g·kg-1和4.67 g·kg-1,绿地开放土壤有机碳含量和密度显著(P<0.05)高于封闭土壤。相比现有土壤有机碳储量(2.99×104 t),拟建成后土壤有机碳库变化较大,有机碳储量预估可达到6.29×104 t,其中开放土壤的有机碳储量为5.38×104 t,约为现有土壤有机碳储量的1.8倍。本研究阐明城镇化建设中土地利用方式转变对土壤有机碳库的影响,对准确量化城市化土壤有机碳库及评估城市碳平衡具有重要意义。

关键词: 城市化, 土地利用方式, 楔形绿地, 开放土壤, 封闭土壤, 有机碳储量

Abstract:

Studying the change of soil organic carbon content in the process of urbanization and identifying the spatial pattern of soil organic carbon will play a guiding role in the study of urban building. In this study, the land use pattern and area were obtained by remote sensing image data, the influence of land use change on soil organic carbon content and density was analyzed, and the soil organic carbon storage of Sanlin Green Wedge to be built was estimated. The results showed that the organic carbon content of unsealed soil and sealed soil were 7.51 g·kg-1 and 4.67 g·kg-1, respectively. The content and density of soil organic carbon in unsealed green space was significantly (P<0.05) higher than that in sealed soil. The existing soil organic carbon storage was about 2.99×104 t. Compared with the current situation, the soil organic carbon pool changed greatly after the proposed construction, and the estimated organic carbon storage could reach 6.29× 104 t. The unsealed soil organic carbon storage was 5.38×104 t, which was about 1.8 times of the existing soil organic carbon storage. This study elucidated the impact of land use change on soil organic carbon pool in the process of urbanization, which was of great significance for accurately quantifying the soil organic carbon pool of urbanization and evaluating urban carbon balance.

Key words: urbanization, land use, green wedge, unsealed soil, sealed soil, organic carbon storage

中图分类号: 

S15

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