Abstract:

The spatial distribution characteristics of soil organic matter and total nitrogen in the Poyang Lake wetland with typical vegetations were studied. Results showed that the vertical distributions of soil organic matter and nitrogen were similar. The concentrations of soil organic matter and total nitrogen in the surface layer were significantly higher than those in the lower layer, and the content of nutrients in the soil below 40 cm kept stable. The horizontal distributions of soil organic matter and total nitrogen in the surface wetland with different vegetation communities were distinctly variable. For example, the highest concentration of soil organic matter was in the Carex cinerascens community wetland, with the least was in the Eleocharis valleculosa community wetland; and the concentration of total nitrogen in Triarrhera lutarioriparia community wetland was the most, and that in Carex cinerascens community wetland was the least.The ratios of carbon and nitrogen were relatively low (10～23). Our results further indicated that many factors affected the spatial distribution of soil organic matter and total nitrogen in the wetland of Poyang Lake, such as the ability of plant absorbing nutrients, vegetation growth,hydrological processes, etc.