Study On The Flux And Source / Sink Function Of CO 2 Sub - Zone In Coastal Plain Of Jiaozhou Bay

Wetland is the transition of terrestrial ecosystem and aquatic environment, and its carbon cycle is an important component of the global carbon cycle. Increasing concentration of greenhouse gases causes global warming and other climate changes.CO2 is the most important greenhouse gas, so its flux and source/sink have always been a focal point. Wetland ecosystem CO2 flux and its source/sink is an important content of study on carbon cycling in wetlands.Paper begins from December 2013 to October 2014, and in a vegetation growth cycle, we had a research of 4 species vegetation type of natural wetland and farming pond, which basically displays day changes and month’s changes law of NEE, and effects factors. Compared with other wetland, Jiaozhou Bay Wetland CO2 source/sink has the feature of being spatio-temporal.⑴CO2 flux performs out obviously with "v" law each month in Jiaozhou Bay natural wetlands: night CO2 release stable; Sunrise, CO2 flux becomes negative, and absolute gradually increases to noon time around reached the maximum value, then gradually reduced to zero. Light intensity and temperature affects CO2 flux during growth period, which has diurnal variation of impact factors.⑵Jiaozhou Bay natural wetlands release CO2 into the atmosphere in February, and in the growing season, wetlands fixes CO2 and CO2 absorption reaches a maximum value in August, and then gradually decreases until the end of the growing season.Monthly variation of NEE and biomass shows a significant correlation in PA wetland.⑶The natural wetland is a sink of atmospheric CO2. In the growing season, as atmospheric CO2 sink, the capacity is generally as follows: SA > PA >SS. In the non-growing season, the natural wetland is a source of atmospheric CO2.⑷Natural wetland is a sink of atmospheric CO2 currently, absorbing the atmosphere CO2:216.48~1377.71 g · m-2 · a-1, 59.04 ~ 375.74 gCO2-C · m-2 · a-1.Compared with other wetland, the function of natural wetlands of Jiaozhou Bay as a carbon sink is quite obvious.⑸Constructed wetland in Jiaozhou Bay(farmed fish pond) is a source of atmospheric CO2 currently, releasing into the atmosphere CO2: 38.61 g·m-2·period-1.