上海市绿地表层土壤有机碳储量的估算

本文调查了上海市472个绿地土壤样点,通过对其土壤有机碳含量、密度等指标进行测定分析,最终估算出上海市绿地土壤表层有机碳储量,同时为预测上海市未来十几年的碳库变化提供数据支撑。研究结果表明:①上海市绿地表层(0～20 cm)土壤有机碳空间分异性较大,土壤有机碳含量和密度表现为西高东低,且自中心向四周逐渐增高。②不同绿地类型土壤有机碳含量大小依次为:公园绿地>公共绿地>道路绿地;有机碳密度的大小依次为:公共绿地>公园绿地>道路绿地。不同绿地类型土壤有机碳含量和密度差异显著,其中,城区不同绿地类型土壤有机碳含量和密度差异显著(P<0.05),但郊区不同绿地类型土壤有机碳含量和密度差异不显著(P>0.05)。③2015年上海市绿地表层土壤有机碳储量约为4.26×106 t。预计到2035年,上海市绿地表层土壤有机碳储量约可达到1.53×107 t。

Estimation of Storage of Organic Carbon in Green Surface Soils in Shanghai

In this study, 472 green surface soil samples (0-20 cm) were collected in Shanghai, the contents and densities of soil organic carbon (SOC) were analyzed, and then the storage of organic carbon of green surface soil was estimated in order to provide data support for predicting the changes of carbon pool in Shanghai in the coming years. The results showed that the spatial variability of SOC in green surface soil was large, and the content and density of SOC were higher in the west region but lower in the east region, and gradually increased from the center to surrounding regions. The contents of SOC were in the order of park green space > public green space > road green space, while the densities of SOC were in the order of public green space > park green space > road green space. There were significant differences in SOC contents and densities among different green spaces, and among them, SOC contents and densities were significantly different in different green spaces within urban area (P<0.05), but no significant differences in suburbs (P>0.05). In 2015, the storage of organic carbon in surface soil of green space in Shanghai was about 4.26 million tons, and is estimated to be 15.3 million tons by 2035.