Effects of Long-Term Elevated CO₂ on Nitrogen Use Efficiency of Calamagrostis angustifolia in Wetlands

Increasing atmospheric CO2 concentration can enhance plant photosynthesis and promote plant growth, thereby affecting the N cycle. To investigate the effects of long-term elevated atmospheric CO2 concentration (eCO2) and N deposition on N absorption and distribution in Calamagrostis angustifolia wetlands in the Sanjiang Plain, this study was conducted in open-top chambers (OTC-1) with 15 years of continuous elevated CO₂ concentration and simulated nitrogen deposition treatment.The focus was on e