Variation Characteristics of Artificial Grassland Carbon Storage in the Underground

Abstract

For a better understanding of the dynamics of rehabilitated grassland, carbon storage in the underground including soil and roots were studied in a space series of replaced time courses.Soil organic carbon (SOC) of the 0-100cm layer increased with the addition of restoration years.It was much more than the average of 4.46-9.95 kg m-2 in central Plateau. SOC in surface soil (layer 0-20cm) fell slightly in early stage (0-2a) and then rose rapidly. In 30a, the increase amplitude turned to be 123% and it reached the maxmum.SOC in this layer was significantly correlated with an average value for the whole 0-100 cm profile.So SOC storage, in the 0-100cm layer, can be well estimated using values for the 0-20 cm layer. Alfalfa underground biomass carbon storage rose first and then reduced. It reached the maxmum in 10a. The carbon storage of weed roots increased continuously and was still less than that of alfalfa roots in 30a.