The Biogeochemical cycle of sulfur in Calamagrostis angustifolia wetland ecosystem in the sanjiang Plain
三江平原小叶章湿地生态系统硫的生物地球化学循环

Using the compartment model, the sulfur distribution and cycle in each compartment of atmosphere-plant-soil system were studied in Calamagrostis angustifolia wetland ecosystem in the Sanjiang Plain. The results showed that the soil was the main storage and current hinge of sulfur in which 97.78% sulfur was accumulated, while only 2.22% sulfur in the plant. In the plant subsystem, the root was the main storage of sulfur and it remained 79.60% of the total sulfur. Sulfur turnover in the Calamagrostis angustifolia wetland ecosystem showed that the aboveground parts took up 0.75 g S/m^2 and the re-translocation amounts to the root were 0.24 g S/m^2, and to the litter were 0.51 g S/m^2 ; the root took up 3.76 g S/m^2 and the translocation amounts to the soil were 3.07 g S/m^2 ; the amounts of sulfur in the litter were 0.75 g S/m^2 a and the translocation amounts to the soil were more than 0. 52 g S/m^2 a. The emission amounts of H2 S from the Calamagrostis angustifolia wetland ecosystem to the atmosphere were 1.42 mg S/m^2, while COS was absorbed by the Calamagrostis angustifolia wetland from the atmosphere and absorption amounts were 1.83 mg S/m^2 ; the input amounts of sulfur from the rain amounts were 5.26 acidification in the to the ecosystem were 4.85mg S/m^2 during the growing season. The difference between input and output mg S/m^2, which indicated that sulfur was accumulated in ecosystem and would lead to the wetland future.