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

Abstract

Lower reaches of Liaohe River Plain is one of the areas where has a long history of planting in China, thus the enhancement of the capacity of soil carbon sequestration in cropland of this area has an important influence on global green house gases mitigation.Based on the 2nd National Soil Inventory data and the latest results from cropland productivity evaluation,the statistical model of soil carbon sequestration potential established by Qin et al. [, the soil organic carbon (SOC) sequestration potential was estimated and the differences of carbon sequestration ability between dry land and paddy field were compared according to the SOC spatio-temporal changes in cropland of Lower reaches of Liaohe River Plain over the last 30 years.The results show that the organic carbon density (SOCP) is 4.95 kg m-2 when the cropland soil organic carbon is saturated. The organic carbon storage in soil surface is 127.33 Tg in this area with an increase of 57.52 Tg. The organic carbon sequestration ability in paddy field is bigger than dry land in Lower reaches of Liaohe River Plain.