• 关键词：枯落物  湿地  盐度  水淹  二氧化碳

• 基金项目：福建省公益类科研院所专项（No.2017R1034-6）；福建师范大学校级创新团队项目（No.IRTL1205）；福建省自然科学基金（No.2015J01161， 2014J01119）；国家自然科学基金（No.31000262）

• 胡伟芳
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学亚热带湿地研究中心, 福州 350007

• 曾从盛
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学亚热带湿地研究中心, 福州 350007;3. 湿润亚热带生态-地理过程教育部重点实验室, 福州 350007

• 张美颖
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学亚热带湿地研究中心, 福州 350007

• 张林海
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学亚热带湿地研究中心, 福州 350007;3. 湿润亚热带生态-地理过程教育部重点实验室, 福州 350007

• 杨平
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学亚热带湿地研究中心, 福州 350007

• 章文龙
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学亚热带湿地研究中心, 福州 350007

• 摘要：在全球气候变暖和盐水入侵的背景下，探究湿地枯落物分解和CO₂释放对盐度和水淹的响应具有重要意义.以闽江河口湿地的短叶茳芏为研究对象，模拟不同盐度和水淹条件下枯落物分解.研究结果表明：①盐度升高抑制枯落物的分解（p<0.01），低盐（5）、中盐（10）、高盐（15）在非水淹条件下分别比对照（0）的失重率平均减少10.83%、17.93%和29.39%，水淹条件下平均减少24.18%、31.62%和47.46%.②对照组的枯落物分解速率为水淹条件（0.0070 d^-1，t_0.95=0.76 a）大于非水淹条件（0.0051 d^-1，t_0.95=0.94 a），而处理组的枯落物分解速率和CO₂释放速率均呈现出非水淹条件大于水淹条件.非水淹的枯落物CO₂释放通量比水淹条件的增长7.05%~86.23%.③在枯落物分解95%的干物质的期间内，与水淹条件相比，非水淹对照组平均每g干物质释放的CO₂高于水淹对照组34.49%；然而，随盐度升高，非水淹条件下的平均每g干物质释放的CO₂受抑制.④盐度和水淹对枯落物残留量的贡献率分别为24.82%和14.29%，对枯落物CO₂释放通量的贡献率分别为75.62%和6.13%.

• Abstract：Response of litter decomposition and carbon dioxide (CO₂) releases to salinity and inundation has an important significance under the background of global climate warming and saltwater intrusion. This study used a microcosm experiment to determine the impact of different salinity and inundation on litter decomposition and CO₂ releases of Cyperus malaccensis from the Min River estuary, SE China. The results show that, ①the litter mass loss rates of in the high salinity (15 pus), middle salinity (10 psu) and low salinity (5 psu) treatments decreased about 10.83%, 17.93% and 29.39% compared with control treatment (0 psu) under the flooded condition, and about 24.18%, 31.62% and 47.46% under the un-flooded condition, respectively; ②the decomposition rates of C. Malaccensis in the flooded condition of the control treatment was 0.0070 d^-1 (t_0.95=0.76 a), which was significantly higher than that in the un-flooded condition of 0.0051 d^-1 (t_0.95=0.94 a) (p<0.05). However, the decomposition rates of C. Malaccensis and its CO₂ release rates were higher in un-flooded condition than in flooded condition for all treatments. Overall, the CO₂ releases rate of C. Malaccensis litter in un-flooded condition increased by 7.05%~86.23% as compared with in flooded condition. ③ During the decomposition period of 95% dry matter, compared with flooded condition, CO₂ releases in un-flooded were higher about 34.49% in control treatment, but inhibited by an increase of salinity. ④ Salinity and inundation contributed about 24.82% and 14.29% to litter mass loss, respectively, and about 75.62% and 6.13% to CO₂ release rates.

• Key words：litter  wetlands  salinity  inundation  carbon dioxide

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