Global Change Research Institute, Academy of Sciences of the Czech Republic, Brno, Czech Republic.
Institute of Systematic Botany and Ecology, Ulm University, Ulm, Germany.
Sci Total Environ. 2023 Jul 15;882:163493. doi: 10.1016/j.scitotenv.2023.163493. Epub 2023 Apr 15.
Internal concentrations in the culm nodes of Phragmites australis and fluxes of methane (CH) and carbon dioxide (CO) were recorded in the treatment bed of constructed wetland (CW) with subsurface wastewater horizontal flow. Fluxes of CH and CO from the CW treatment bed were in ranges of 0 to 490 μmol m h and from 0 to 4499 μmol m h for CH and CO, respectively. The highest CH soil fluxes were recorded in the unvegetated coarse gravel inflow zone of the CW treatment bed. The nearby inflow zone exhibited the highest CO fluxes. Internal culm node concentrations of CH and CO were related to oxygen (O) stem concentrations and environmental conditions during diurnal courses. The concentrations of CH and CO gases were significantly correlated and opposing O concentrations. Culm node parameters and shoot density of P. australis influenced internal gas concentrations and the buffering of CH and CO emissions. The effect of buffering CH emissions is distinctive in the outflow zone of the treatment bed and is less important in the highly polluted inflow zone of the CW. Buffering of CH and partially also CO emissions by stems of P. australis is a process which affects the diurnal dynamics of CH and CO fluxes from common reed wetlands.
芦苇（Phragmites australis）秆节点内浓度和湿地（CW）处理床中甲烷（CH）和二氧化碳（CO）通量的研究。地下水平流人工湿地处理床中 CH 和 CO 的通量范围分别为 0 至 490 μmol m h 和 0 至 4499 μmol m h。CH 的最高土壤通量记录在 CW 处理床的无植被粗砾石入流区。附近的入流区表现出最高的 CO 通量。CH 和 CO 内部秆节点浓度与白天过程中氧（O）秆浓度和环境条件有关。CH 和 CO 气体的浓度显著相关，与 O 浓度相反。CH 和 CO 排放的缓冲作用受 P. australis 的秆节点参数和芽密度的影响。缓冲 CH 排放的效果在处理床的流出区很明显，而在 CW 的高度污染入流区则不那么重要。CH 和部分 CO 排放由 P. australis 的茎缓冲是影响常见芦苇湿地 CH 和 CO 通量日动态的一个过程。
