Liaohe River Delta Wetland Creation And Restoration Of The Growing Season CO ₂ Emission Flux Distribution

The coastal wetland ecosystem plays an very important role in global carbon cycle, which is regarded as "pool of blue cabron" and get a lot of attention. It’s very important to estimate the balance of carbon in created and restored wetlands, because a lot of natural coastal wetlands are destructed in result of human activities. Emissions of greenhouse gases included C and relative environmental factors have great significant effect in ecological carbon estimate. In coastal wetlands, iron SO42-has a control of emission of CO2.This study aims to explore the patterns of CO2fluxes of different experimental treatments and related environmental elements in seablite (Suaeda salsa) created and reed (Phragmites anstralis) restored wetlands. The CO2fluxes were measured during a growing season using the dark static chamber technique, and related to soil moisture content, soil water salinity, pH and HCO3-concentration, temperature as well as the above and below ground plant biomass. The objective is to explore the pattern of CO2emission and its response to the changes of environmental factors during the growing season in created wetlands (CW) vegetated by seablite and restored wetlands (RW) vegetated by common reed, which matters to evaluation of carbon cycle, comprehension of pattern of CO2, function recover of CW and RW. The followings are mainly included:1、 After the two-year measurement:the ecosystem CO2flux of seablite created and reed restored wetlands reached the maximum in August and July, which were the peak of the whole growing season.2、Measured environmental elements, including temperature, above ground biomass, below ground biomass, soil moisture, all affect the CO2fluxes a lot. The CO2fluxes of different treatments in seablite wetland were positive correlated with temperature, above ground biomass and below ground biomass. While, the CO2fluxes of different treatments in reed wetland have a significant linear correlation to temperature, above ground biomass, below ground biomass and soil moisture (negatively correlated).3、Patterns of seablite created wetland are more obvious than that of reed restored wetland. Regularity of the CO2fluxes of different treatments shows as Reco>Rp>Rpiant>Rcut, and the ecosystem CO2flux (Reco) was from the standing plants (Rpiant). while only6-33%came from soil respiration (Rsoii) during the growing season. But Rsoil gradually increased from September and reached up to63%of Reco in October. The minimum of ratio of Rsoil/Reco appeared in August.4-. Pattern of RW is a little more complicated in the experimental growing season than CW’s, only the pattern of Reco>Rcut>Rsoil was observed, and the ratio (Rsoil/Reco) increased to the minimum in September. In the reed restored wetland, Rplant and Rsoil contributed35-91%and9-65%of Reco respectively. The ecosystem CO2flux Reco was positively correlated with both temperature and plant biomass, being negatively related with soil moisture content.