陆地表层碳循环与温度反馈机制研究

在考虑人类活动及陆地表层碳循环各要素反馈关系的基础上 ,建立了陆地表层碳循环零维模型 ,对陆地表层碳循环与温度反馈机制进行了研究。零维模型研究碳在陆地表层生物、残落物、土壤有机质、大气中的流动 ,把人类活动及海洋对碳循环的影响作为一种外在强迫加以考虑。它较好地反映了 186 0年至 1997年人类活动对碳循环的影响及温度对碳循环的反馈关系 ,它模拟的大气CO2 含量的变化与实际观测值相近 ;模拟的地表年平均温度的变化趋势与实际观测值及同行的研究结果一致

A feedback mechanism research on the carbon cycle and temperature of terrestrial surface system

On the basis of taking into account the main feedback relations of carbon cycle terestrial surface system,the authors employ highly integrated and simplified methods to establish a carbon cycle zero-dimension model of land surface system (CCZDM),and study carbon fluxes among four carbon reservoirs (land biota, litter carbon, soil carbon and atmospheric carbon), by taking impact of human activities and ocean influence as external factors. The CCZDM supposes that Human Being's impacts are not enough to break the natural balance of carbon cycle before the year 1860, but since then the balance has been broken owing to the industrial revolution. A large quantity of CO 2 was emitting into the atmosphere by burning fossil fuels, intensifying agriculture and destroying segments of the vegetation cover of the earth. With the increase of atmospheric CO 2 , the global temperature increased accordingly, which, in turn , affects carbon cycle of terrestrial system. The changes of four carbon reservoirs and temperature are simulated through CCZDM from the year of 1860 to 1997 and the results show that the simulated data are compatible with observational as well as other research findings. This demonstrates that the model is reasonable and the parameter values are correct. The study of CCZDM can provide theoretical guides to that of two-dimension carbon cycle of land surface system.