Enhanced Carbon Uptake and Reduced Methane Emissions in a Newly Restored Wetland. Issue 1 (21st January 2020) - Yang, Hualei
Abstract: Wetlands play an important role in reducing global warming potential in response to global climate change. Unfortunately, due to the effects of human disturbance and natural erosion, wetlands are facing global extinction. It is essential to implement engineering measures to restore damaged wetlands. However, the carbon sink capacity of restored wetlands is unclear. We examined the seasonal change of greenhouse gas emissions in both restored wetland and natural wetland and then evaluated the carbon sequestration capacity of the restored wetland. We found that (1) the carbon sink capacity of the restored wetland showed clear daily and seasonal change, which was affected by light intensity, air temperature, and vegetation growth, and (2) the annual daytime (8–18 hr) sustained‐flux global warming potential was −11.23 ± 4.34 kg CO2 m −2 y −1, representing a much larger carbon sink than natural wetland (−5.04 ± 3.73 kg CO2 m −2 y −1 ) from April to December. In addition, the results showed that appropriate tidal flow management may help to reduce CH4 emission in wetland restoration. Thus, we proposed that the restored coastal wetland, via effective engineering measures, reliably acted as a large net carbon sink and has the potential to help mitigate climate change. Key Points: The main factors that influenced wetland greenhouse gas emissions were plant growth, water flow, and nitrogen loading The restored wetland was a much stronger carbon sink than the natural wetland by maximizing CO2 uptake and minimizing CH4 emissions Altering species composition and water flow as part of wetland restoration was an innovative strategy for mitigating climate change