Characteristics of greenhouse gas emission in the Yellow River Delta wetland

The Yellow River Delta wetland is the most integrated, broadest, youngest wetland ecological system in China. Due to the affection by human activities, the wetland is under a degraded risk and urgently require for ecological restoration. Moreover, the wetland is an influenced and responsive region of global change because of its unique water-heat effect and greenhouse gas metabolic process. In this study, five typical salt marsh plant communities were selected to study the characteristics of greenhouse gas emission of the wetland. The results indicated that the greenhouse gas emission, especially for the CO2 and CH4, showed a distinctly spatial variation. The sample site (HW4) discharged the maximum emissions concentration of CH4 and CO2, reaching 691.6 and 1.32 mg/m3 in the static opaque chamber, respectively. The total annual emissions of CH4 and CO2 were approximately 1.20 × 104 t a−1 and 18.4 × 104 t a−1 in the five plant communities. It was also found that the relationship of the soil moisture to CH4 emissions was positive correlation, but that to CO2 emissions was negative correlation. In addition, there was a linear correlation (y = 0.0196x + 0.0252, R2 = 0.9872) between the content of Fe and Mn in the soil.