• 关键词：氮输入  沼泽湿地  CO₂  CH₄  N₂O  增温潜势

• 基金项目：国家自然科学基金(No.40471124);;中国科学院知识创新工程重大项目(No.KZCX1SW01,No.KZCX3SW332)

• 张丽华
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 宋长春
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 王德宣
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 摘要：利用静态暗箱气象色谱法,选取小叶章沼泽化草甸进行野外原位试验,研究氮输入对沼泽湿地CO₂、CH₄和N₂O等3种温室气体排放的影响.结果表明:氮输入对沼泽湿地CO₂和CH₄排放有明显影响,其季节排放总量分别是对照处理的1.3和2.5倍,但对CO₂和CH₄的季节变化模式无明显影响;氮输入对N₂O的排放强度和季节变化模式均有显著影响.CO₂排放通量与5cm深土壤温度存在显著的正相关关系,与地表温度和1.5m气温存在指数关系,而CH₄和N₂O排放与温度之间没有显著的相关性.在20、100和500年时间尺度上氮输入处理的CH₄和N₂O全球增温潜势(GWP)分别比对照处理增加了150%、150%和80%,表明氮输入在长、短时间尺度上都是增强CH₄和N₂O的温室效应的.

• Abstract：By using the static opaque chamber-GCtechniques, the influence of nitrogen addition in situ on emissions of CO₂, CH₄ and N₂O from Doyeuxia angustifolia wetland was studied. The results showed that there were no significant differences in patterns of seasonal variations of CO₂ and CH₄ among the treatments, but the CO₂ and CH₄ emission with nitrogen addition treatment increased 30% and 150% respectively compared to the control treatment. However, both the seasonal pattern and emissions of the N₂O were significantly affected by the nitrogen addition. The CO₂ flux increased with the increase of the temperature, and there was no significant statistical correlation between the CH₄ flux and temperature, so is the N₂O. On long time scale of 20, 100, and 500-year period, the integrated global warming potential (GWP) of CH₄+N₂O released during the growing season for the treatments of nitrogen addition was 150%, 150% and 80%, respectively, higher than that for the control treatment, which suggested that the nitrogen addition could enhance the GWP of the CH₄ and N₂O either in long time or short time scale.

• Key words：nitrogen addition  swamp wetland  CO₂  CH₄  N₂O  GWP

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