基于GIS的不同盖层下CO_2释放量随温度场的变化规律研究

Variation of CO_2 Release with Temperature Field of Soil under Different Covers Based on GIS

城市土体温度场分布受覆盖层性质的影响,而土体中有机质分解速率及CO2释放量随温度变化而变化,因而,盖层性质将会影响土体的CO2释放量。在室内试验确定CO2释放量与温度场变化规律的基础上,通过野外观测站长期观测所得的不同盖层下土体温度场变化规律,建立了不同盖层下土体释放CO2与温度的关系模型;采用ArcGIS对南京大学校区的不同盖层进行分区,并利用CO2释放量与温度的关系模型生成了校区CO2释放量在某一时间段内的空间分布图。同时,分别以城区和郊区同一时段内的野外监测数据应用于研究区,研究了城市热岛效应对研究区土体CO2释放量的影响。

The distribution of urban soil temperature field is affected by the properties of ground covers. The decomposition rate of organic matter in soil and the CO2 release change with temper- ature. Therefore, the properties of ground covers will affect the CO2 release of soil. In this re- search, the relation models of CO2 release amount and the temperature of soil were built based on laboratory tests as well as long-term observation data of soil temperature field under different ground covers. The map of different ground covers of Nanjing University campus was established by ArcGIS. Then the spatial distribution map of CO2 release amount of the campus in a certain time interval was built by using the relation models of CO2 release amount and the temperature of soil. Meanwhile, the field used for the research area. monitoring data of urban and suburban in the same time interval were The effect of urban heat island on CO2 release amount of soil mass in research area was studied based on these data.