Spatial Analysis of Land Use Change Effect on Soil Organic Carbon Stocks in Sanjiang Plain of China between 1980 and 2016

1 Introduction Marsh-wetland,as an important type of wetlands,is a synthetic natural ecosystem with rich soil organic carbon.The largest area of marsh-wetland was located in Sanjiang Plain in the Northeast China and obvious land use changes have occurred during the last 50 years with large area of marsh-wetland cultivated to farmland which had a big impact on soil organic carbon stock.In this study,spatial distributions of 0-20cm soil organic carbon sources and sinks in Sanjiang Plain were investigated from 1980 to 2016.