Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Key Laboratory for Applied Technology of Sophisticated Analytical, Instrument of Shandong Province, Jinan, 250014, China.
Qilu University of Technology (Shandong Academy of Sciences), Shandong Analysis and Test Center, Key Laboratory for Applied Technology of Sophisticated Analytical, Instrument of Shandong Province, Jinan, 250014, China.
Environ Pollut. 2018 Aug;239:289-299. doi: 10.1016/j.envpol.2018.04.043. Epub 2018 Apr 13.
Due to the severe degradation and environmental pollution of coastal wetlands by human activities, they have gradually become an important source of greenhouse gases (GHGs) emissions, so exploring the characteristics of their emission is important to reduce greenhouse gas emissions from coastal wetlands. In this study, the dynamics of methane (CH) and carbon dioxide (CO) emissions were investigated in five kinds of typical tidal flats from the Yellow River delta wetland during the years 2011-2013, and the influences of water level and salinity on their emissions were explored in laboratory experiments. The mean fluxes of CO and CH were -20.98 to 68.12 mg m h and -0.12 to 0.44 mg m h across all seasons in the five kinds of representative tidal flats. The highest and lowest mean fluxes of CO were mainly observed during summer and winter, respectively, whereas the seasons with the highest and lowest mean fluxes of CH varied according to the type of tidal flat. The results showed that the summer season and the mud flat environment had the largest contributions to greenhouse gas emissions. In laboratory experiments, the largest sequestration fluxes of CO and CH were observed with +4/+2 cm and -4 cm water levels, respectively, indicating that a moderately high water level was beneficial for CO sequestration but led to the increase of CH emission. In the study of salinity, we found that the largest sequestration fluxes of CO and CH were both detected at 24 g L salinity, indicating that high salinity level was advantageous for CO and CH sequestration in the five simulation devices. Furthermore, a carbon cycle pathway of coastal wetlands was proposed, which could have a vital significance for research into the global carbon cycle. We can reduce GHG emissions by protecting the coastal wetlands and lessening human activities.
由于人类活动对沿海湿地的严重退化和环境污染，它们已逐渐成为温室气体（GHG）排放的重要来源，因此探索其排放特征对于减少沿海湿地的温室气体排放至关重要。本研究于 2011-2013 年期间，调查了黄河三角洲湿地五种典型潮滩的甲烷（CH）和二氧化碳（CO）排放动态，并通过实验室实验探讨了水位和盐度对其排放的影响。五种典型潮滩在所有季节的 CO 和 CH 平均通量分别为-20.98 至 68.12mgm h 和-0.12 至 0.44mgm h。CO 的最高和最低平均通量主要发生在夏季和冬季，而 CH 的最高和最低平均通量则随潮滩类型而变化。结果表明，夏季和泥滩环境对温室气体排放的贡献最大。在实验室实验中，观察到+4/+2cm 和-4cm 水位下 CO 和 CH 的最大固存通量，这表明适度高水位有利于 CO 固存，但会导致 CH 排放增加。在盐度研究中，我们发现 24g L 盐度下 CO 和 CH 的最大固存通量均被检测到，这表明高盐度水平有利于五种模拟装置中 CO 和 CH 的固存。此外，提出了一个沿海湿地碳循环途径，这对于研究全球碳循环具有重要意义。我们可以通过保护沿海湿地和减少人类活动来减少温室气体排放。
