Elevated atmospheric CO2 has direct and indirect influences on ecosystem processes. The impact of elevated atmospheric CO2 concentration on carbon and nitrogen transformations, together with the microbial community, was evaluated with water hyacinth (Eichhornia crassipes) in an open-top chamber replicated wetland. The responses of nitrogen and carbon pools in water and wetland soil, and microbial community abundance were studied under ambient CO2 and elevated CO2 (ambient + 200 μL L−1). Total biomass for the whole plant under elevated CO2 increased by an average of 8% (p = 0.022). Wetlands, with water hyacinth, showed a significant increase in total carbon and total organic carbon in water by 7% (p = 0.001) and 21% (p = 0.001), respectively, under elevated CO2 compared to that of ambient CO2. Increase in dissolved carbon in water correlates with the presence of wetland plants since the water hyacinth can directly exchange CO2 from the atmosphere to water by the upper epidermis of leaves. Also, the enrichment CO2 showed an increase in total carbon and total organic carbon concentration in wetland soil by 3% (p = 0.344) and 6% (p = 0.008), respectively. The total nitrogen content in water increased by 26% (p = 0.0001), while total nitrogen in wetland soil pool under CO2 enrichment decreased by 9% (p = 0.011) due to increased soil microbial community abundance, extracted by phospholipid fatty acids, which was 25% larger in amount than that of the ambient treatment. The study revealed that the elevated CO2 would affect the carbon and nitrogen transformations in wetland plant, water, and soil pool and increase soil microbial community abundance.

中文翻译：

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大气CO ₂浓度升高对复制湿地碳氮转化和微生物群落的影响

大气中二氧化碳浓度升高对生态系统过程具有直接和间接的影响。在一个开放式室复制湿地中，使用水葫芦（凤眼莲）评估了大气中二氧化碳浓度升高对碳和氮转化以及微生物群落的影响。研究了水和湿地土壤中氮和碳库的响应以及环境CO2和CO2升高（环境+ 200μLL-1）下微生物群落的丰度。在二氧化碳浓度升高的情况下，整个植物的总生物量平均增加了8％（p = 0.022）。与环境CO2相比，在具有较高水平的CO2的情况下，具有水葫芦的湿地显示水中的总碳和总有机碳分别显着增加7％（p = 0.001）和21％（p = 0.001）。水中的溶解碳增加与湿地植物的存在有关，因为风信子可以通过叶片的上表皮将大气中的CO2直接交换为水。同样，富集的二氧化碳显示湿地土壤中的总碳和总有机碳浓度分别增加了3％（p = 0.344）和6％（p = 0.008）。水中的总氮含量增加了26％（p = 0.0001），而在CO2富集下的湿地土壤池中的总氮减少了9％（p = 0.011），这是由于磷脂脂肪酸提取的土壤微生物群落丰度增加了。比环境处理量大25％。研究表明，升高的CO2会影响湿地植物，水，