Abstract:

In order to accurately explore the differences of different vegetation types in lake riparian zone, and to provide a theoretical basis for research on wetlands ecosystem balance of carbon budget, daily variations of soil carbon flux of the three communities (Cattails, Phragmites and Artificial Poplar) in the Dongpinghu riparian zone were measured continuously in the spring of 2011 using LI-8100 automated soil CO2 flux system. Environmental factors were also measured during the sampling periods. The results showed: (1) the soil organic matter of the artificial poplars was more higher than the other two primary wetland soil; (2) the diurnal curves of soil respiration rate under the three communities had a simple peak value correlated well with atmosphere temperature generally with its maximum during 12:00-14:00 and minimum during 6:00; (3) exponential models were used to describe the relationships between soil respiration rate and air temperature above ground, soil temperature, and the correlation between soil respiration rate and air temperature above ground was higher than that between soil respiration rate and soil temperature for the three communities. The environmental effects on soil respiration differed among plant community types. It was concluded that environmental changes would alter the daily soil respiration patterns for three plant communities.