Profile Distribution Characteristics of Total Nitrogen and Soil Organic Matter in Different Types of Land Use in Baiyangdian Lake

Baiyangdian Lake is one of the biggest freshwater wetland in North China. However, in recent years, Baiyangdian Lake was disturbed and utilized intensively, resulting in its land-use types changed greatly, which might change the characteristics of the nutrient element distribution. So profile distribution characteristics of soil organic matter (SOM) and total nitrogen (TN) were measured in four different land-use types in Baiyangdian Lake. Profile maps were constructed to describe the spatial distribution of SOM and TN. Results showed that spatial distributions of both SOM and TN were very similar in soil profiles(0-100cm) of the soils of woodland, farmland, and grassland, decreasing gradually with depth, while in the reed-bed soils, the spatial distribution characteristics in soil profiles was the opposite, increasing gradually with depth. Correlation analysis showed that the distribution of SOM and TN were influenced by pH values more strongly than influenced by TP contents.