Yang Wen-Bin, Yuan Chung-Shin, Tong Chuan, Yang Pin, Yang Lei, Huang Bang-Qin
Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC.
Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC.
Mar Pollut Bull. 2017 Jun 15;119(1):289-298. doi: 10.1016/j.marpolbul.2017.04.005. Epub 2017 Apr 25.
Wetlands play a crucial role in modulating atmospheric concentrations of greenhouse gases (GHGs) such as carbon dioxide (CO), methane (CH), and nitrous oxide (NO). The key factors controlling GHG emission from subtropical estuarine wetlands were investigated in this study, which continuously monitored the uptake/emission of GHGs (CO, CH, and NO) by/from a subtropical estuarine wetland located in the Minjiang estuary in the coastal region of southeastern China. A self-designed floating chamber was used to collect air samples on-site at three environmental habitats (Phragmites australis marsh, mudflats, and river water). The CO, CH, and NO concentrations were then measured using an automated nondispersive infrared analyzer. The magnitudes of the CO and NO emission fluxes at the three habitats were ordered as river water>P. australis>mudflats. P. australis emitted GHGs through photosynthesis and respiration processes. Emissions of CH from P. australis and the mudflats were revealed to be slightly higher than those from the river water. The total GHG emission fluxes at the three environmental habitats were quite similar (4.68-4.78gmh). However, when the total carbon dioxide equivalent fluxes (CO-e) were considered, the river water was discovered to emit the most CO-e compared with P. australis and the mudflats. Based on its potential to increase global warming, NO was the main contributor to the total GHG emission, with that emitted from the river water being the most considerable. Tidal water carried onto the marsh had its own GHG content and thus has acted as a source or sink of GHGs. However, water quality had a large effect on GHG emissions from the river water whereas the tidal water height did not. Both high salinity and large amounts of sulfates in the wetlands explicitly inhibited the activity of CH-producing bacteria, particularly at nighttime.
湿地在调节大气中二氧化碳（CO）、甲烷（CH）和一氧化二氮（NO）等温室气体（GHGs）的浓度方面发挥着关键作用。本研究调查了控制亚热带河口湿地温室气体排放的关键因素，该研究持续监测了中国东南部沿海地区闽江口一个亚热带河口湿地的温室气体（CO、CH和NO）吸收/排放情况。使用自行设计的浮动气室在三个环境栖息地（芦苇沼泽、泥滩和河水）现场采集空气样本。然后使用自动非色散红外分析仪测量CO、CH和NO的浓度。三个栖息地的CO和NO排放通量大小顺序为河水>芦苇>泥滩。芦苇通过光合作用和呼吸过程排放温室气体。芦苇和泥滩的CH排放量略高于河水的排放量。三个环境栖息地的总温室气体排放通量非常相似（4.68 - 4.78g/m²h）。然而，当考虑总二氧化碳当量通量（CO₂-e）时，发现河水排放的CO₂-e比芦苇和泥滩更多。基于其加剧全球变暖的潜力，NO是总温室气体排放的主要贡献者，其中河水排放的NO最为可观。带入沼泽的潮水有其自身的温室气体含量，因此充当了温室气体的源或汇。然而，水质对河水的温室气体排放有很大影响，而潮水高度则没有。湿地中的高盐度和大量硫酸盐都明显抑制了产甲烷细菌的活性，尤其是在夜间。
