Virioplankton abundance and its relationship with dissolved organic carbon in Napahai plateau wetland

Abstract:

[Background] Virioplankton plays an important role in organic carbon cycle. [Objective] We studied the abundance of virioplankton and bacteria in different seasonal water samples and soil samples in Napahai wetland, and analyzed the relationship between the abundance of virioplankton and soluble organic carbon in different seasons. [Methods] The abundance of virioplankton and bacteria in water samples of different seasons was detected by Epifluorescence Microscopy. The abundance of virus and bacteria in soil samples of different seasons was detected by Flowcytometry. [Results] The abundance of phytoplankton bacteria and virus was 3.38×106/mL and 4.38×107/mL in rainy season. The abundance of phytoplankton bacteria and virus in the dry season was 8.85×105/mL and 9.66×106/mL, the average annual abundance of phytoplankton bacteria and virus was 2.13×106/mL and 2.67×107/mL. There were significant differences of phytoplankton bacteria and virus abundance in different seasons. The yield of bacterial carbon was 8.01 μg C/(L·h) in the rainy season, and 10.30 μg C/(L·h) in the dry season. The DOC contributed by the virioplankton accounted for 32.38% to 76.38% of the total DOC library in the rainy season, while it was 8.23% to 47.87% in the dry season. [Conclusion] Virioplankton plays an important role in the organic carbon cycle of the Napahai wetland.