School of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, PR China; Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou, 350007, PR China; Research Centre of Wetlands in Subtropical Region, Fujian Normal University, Fuzhou, 350007, PR China.
Department of Biosciences, Swansea University, Swansea, SA2 8PP, UK.
Environ Pollut. 2022 Jul 15;305:119276. doi: 10.1016/j.envpol.2022.119276. Epub 2022 Apr 8.
Widespread conversion of coastal wetlands into aquaculture ponds in coastal region often results in degradation of the wetland ecosystems, but its effects on sediment's potential to produce greenhouse gases remain unclear. Using field sampling, incubation experiments and molecular analysis, we studied the sediment CH production potential and the relevant microbial communities in a brackish marsh and the nearby aquaculture ponds in the Min River Estuary in southeastern China. Sediment CH production potential was higher in the summer and autumn months than in spring and winter months, and it was significantly correlated with sediment carbon content among all environmental variables. The mean sediment CH production potential in the aquaculture ponds (20.1 ng g d) was significantly lower than that in the marsh (45.2 ng g d). While Methanobacterium dominated in both habitats (41-59%), the overall composition of sediment methanogenic archaea communities differed significantly between the two habitats (p < 0.05) and methanogenic archaea alpha diversity was lower in the aquaculture ponds (p < 0.01). Network analysis revealed that interactions between sediment methanogenic archaea were much weaker in the ponds than in the marsh. Overall, these findings suggest that conversion of marsh land to aquaculture ponds significantly altered the sediment methanogenic archaea community structure and diversity and lowered the sediment's capacity to produce CH.
沿海地区广泛将滨海湿地转化为水产养殖池塘，往往导致湿地生态系统退化，但它对沉积物产生温室气体的潜力的影响尚不清楚。本研究采用野外采样、培养实验和分子分析的方法，研究了中国东南部闽江河口盐沼湿地及其附近水产养殖池塘的沉积物 CH 产生潜力及其相关微生物群落。沉积物 CH 产生潜力在夏季和秋季高于春季和冬季，并且与所有环境变量中的沉积物碳含量显著相关。水产养殖池塘中的沉积物 CH 产生潜力（20.1ng g d）显著低于沼泽湿地（45.2ng g d）。虽然两种生境中都以甲烷杆菌（Methanobacterium）为主（41-59%），但两种生境中沉积物产甲烷古菌群落的总体组成差异显著（p<0.05），水产养殖池塘中的产甲烷古菌 alpha 多样性较低（p<0.01）。网络分析表明，池塘中的沉积物产甲烷古菌之间的相互作用比沼泽湿地中的弱。总的来说，这些发现表明，将沼泽地转化为水产养殖池塘会显著改变沉积物产甲烷古菌群落结构和多样性，并降低沉积物产生 CH 的能力。
