The Spatial and Temporal Variation Characteristics of CH4 and CO2 Emission Flux under Different Land Use Types in the Yellow River Delta Wetland

The Yellow River Delta Wetland is one of the youngest wetlands, and also the most complete, extensive wetlands in China. The wetland in this delta is ecologically important due to their hydrologic attributes and their roles as ecotones between terrestrial and aquatic ecosystems. In the study, the spatial and temporal variation characteristics of CH4 and CO2 emission flux under five kinds of land use types in the wetland were investi gated. The results indicated that the greenhouse gas emission flux, especially the CO2 and CH4 , showed distinctly spatial and temporal variation under different land use types in the wetland. In the spring, the emission flux of CO 2 was higher than that of CO2 in the autumn , and appeared negative in HW3 and HW4 in the autumn.