水位波动对蒲草湿地土壤碳排放的影响研究

Study on the Effect of Water Level Fluctuation on Soil Carbon Emission in Cattail Wetland

摘要: 为了研究黄河中游水位波动对蒲草湿地土壤碳排放的影响，利用室内培养法分析不同水位变化后的CO₂排放速率。结果表明：低水位水平下蒲草湿地土壤CO₂排放速率变化于0~0.035 mmol·m⁻²·h⁻¹，平均水平为0.017 mmol·m⁻²·h⁻¹。高水位下蒲草湿地土壤CO₂排放速率变化于0.005~0.035 mmol·m⁻²·h⁻¹，平均水平为0.020 mmol·m⁻²·h⁻¹。低水平水位下土壤CO₂排放速率波动幅度大于高水平状态。水位变化对蒲草湿地土壤CO₂排放速率的影响与土壤、植被的环境适应过程以及排放环境紧密相关。

Abstract: In order to study the influence of water level fluctuation in the middle reaches of the Yellow River on soil carbon emission in cattail (Typha angustifolia) wetland, the CO₂ emission rate of different water level changes was collected by static alkaline absorption method. The results showed that under low water levels, the CO₂ emission rate of soil in cattail wetland varied from 0 to 0.035 mmol·m⁻²·h⁻¹, with an average level of 0.017 mmol·m⁻²·h⁻¹. Under high water level, the CO₂ emission rate of soil in cattail wetland varied from 0.005 to 0.035 mmol·m⁻²·h⁻¹, with an average level of 0.020 mmol·m⁻²·h⁻¹. The fluctuation amplitude of soil CO₂ emission rate under low-level water level was greater than that under high-level state. The effect of water level changes on soil CO₂ emission rate in cattail wetland is closely related to the environmental adaptation process of soil and vegetation and the emission environment.