下辽河平原区农田土壤固碳潜力估算

Evaluation of Carbon Sequestration Potential in Cropland Soil in the Lower Liaohe River Plain

利用1980年第二次土壤普查数据和2010年耕地地力评价数据,结合近30年来的调查研究资料和田间试验数据,建立该地区耕地土壤固碳潜力模型。预测该地区土壤固碳潜力(饱和碳密度)为4.95 kg m-2,其空间分异明显,整体表现为东部高西部低、北部高南部低;根据最新土壤调查数据所建立的模型进行估算,该区域潜在耕地土壤碳汇密度增加值为2.18kg m-2,可增加耕地土壤固碳量为57.52 Tg。

We established a model for the estimation of soil carbon sequestration potential in the farmland of the lower Liaohe river plain, with the survey data of the second soil census in 1980 as well as the evaluation data of cultivated land fertility in 2010. We predicted the soil carbon sequestration potential(saturation) was 4.95 kg m-2. With an obvious spatial differentiation, soil carbon sequestration potential generally decreased from the east to the west or from the north to the south. According to the model which was established by the latest survey data, we estimated that the density increase of the soil carbon sequestration potential was 2.18 kg m-2, and the soil carbon sequestration content of the newly increased farmland was 57.52 Tg.