Effect of different restoration patterns on soil carbon accumulation of meadows steppe

The soil organic carbon density was applied to determine the effect of land restoration patterns, including fruitgrass, fruitcrop, forest land, artificial pasture, natural grassland and cropland pattern, on the soil carbon accumulation in this study. This study showed that the organic carbon density of soil in the cropland pattern was significantly higher than that in the other restoration patterns within 1 meter depth soil (P0.01). Soil carbon accumulation among six land restoration pattern showed three characteristics as following; Firstly, the organic carbon accumulation among fruitgrass and forest restoration pattern was not significant difference when soil depth was below 60 cm and it decreased when soil depth was over 60 cm; secondly, the organic carbon accumulation of soil among fruitcrop and artificial pasture restoration pattern reduced slowly with the increase of soil depth; thirdly, organic carbon density increased gradually with the increase of soil depth among natural grassland restoration pattern. Except for the natural grassland restoration pattern, more than 80% organic carbon accumulation among other five restoration patterns was deposited within 60cm soil layer.