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基于遥感反演的1988年与2000年土地利用数据、土地动态模拟系统(DLS)模拟的2012年与2020年全国栅格尺度的耕地分布数据及我国农业综合区划结果,应用CENTURY模型估算了中国1988～2020年农田土壤有机碳贮量时空变化规律,分析了1988～2000年、2000～2012年与2012～2020年三个时段中国农田土壤有机碳贮量变化情况。研究结果表明,1988～2000年全国大部分地区的农田土壤有机碳贮量呈增长态势;而2000～2012年全国农田土壤有机碳贮量将出现一定幅度的下降;2012～2020年间,虽然全国范围内的农田土壤有机碳贮量仍表现为下降趋势,但下降幅度较2000～2012年间显著减少。研究结果还表明,我国九大农业生态区的农田土壤有机碳贮量变化具有显著的时空分异特征。
Based on the land use data and the land dynamic simulation system (DLS) simulated by 1988 and 2000 from the remote sensing data and the national grid-scale distribution of cultivated land in 2012 and 2020 and the result of agricultural comprehensive zoning in China, The spatial and temporal variation of soil organic carbon storage in farmland from 2020 to 2000 were analyzed. The changes of soil organic carbon storage in farmland in China from 1988 to 2000, from 2000 to 2012 and from 2012 to 2020 were analyzed. The results show that from 1988 to 2000, the soil organic carbon storage in farmland showed an increasing trend in most parts of China, while the total amount of soil organic carbon storage in farmland in China dropped slightly from 2000 to 2012. In the period from 2012 to 2020, The soil organic carbon storage in farmland still showed a downward trend, but the decrease range was significantly reduced from 2000 to 2012. The results also show that the changes of soil organic carbon storage in the nine agro-ecological zones in China have significant spatial-temporal differentiation characteristics.