Research on net primary productivity and soil organic carbon pool in the coal mining area of Xuzhou

Soil organic carbon (SOC) pool plays an important role in the land ecosystem carbon cycle, and Net primary productivity (NPP) is one of the driving forces that have a notable impact on the SOC pool. An assessment of SOC Pool in coal mining area which spatial distribution and temporal variation associated with NPP can provide scientific basis for government to reduce carbon emission and increase carbon sink. Study on NPP and soil carbon stock in regional scale, it can not only reduce the uncertainty in large spatial scale, but also provide substantial data for the study. The influences of intensive NPP on regional soil carbon stock in typical sensitive area are the key point for regional researches, especially for the typical coal mining area of Xuzhou. In this experiment, the NPP was increasing from 1997 to 2003 due to the environmental protection and vegetation coverage increasing in the study area. The woodland increased year by year because of the new governmental laws. The emission of SOC and O2 varied with the NPP in the same spatiotemporal dynamic evolution. They were also increasing from 1997 to 2003. The flux of SOC increased rapidly with the development of economy. The aggregation of SOC reached the highest in 2003, so diversity index was continually increased and the ecosystem of mining area is turning to the diversification and homogenization.