• 关键词：N₂O通量  SO₄^2-沉降  野慈姑  感潮淡水湿地  闽江口

• 基金项目：国家自然科学基金（No.41371127）；福建省基本科研专项重点项目（No.2014R1034-1）；福建师范大学校级创新团队项目（No.IRTL1205）

• 何露露
• 福建师范大学地理科学学院, 福州 350007

• 代超
• 福建师范大学地理科学学院, 福州 350007

• 谭立山
• 福建师范大学地理科学学院, 福州 350007

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

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

• 摘要：选取闽江口塔礁洲淡水感潮野慈姑（Sagittaria trifolia L.）湿地为研究对象，2015年12月-2016年10月，每月小潮日原位定期向实验样地施加2个沉降量水平的硫酸钾溶液：S60（60 kg·hm^-2·a^-1）和S120（120 kg·hm^-2·a^-1），运用静态箱-气相色谱法研究模拟硫酸根沉降对河口区淡水感潮湿地N₂O通量的影响及主要环境影响因子.对照、S60和S120 3个处理下N₂O通量分别为（58.06±23.07）、（23.50±22.85）和（20.75±7.83）μg·m^-2·h^-1，年尺度上，S120处理显著降低N₂O通量（p < 0.05），S60处理与CK处理差异不显著（p > 0.05）.闽江口淡水感潮野慈姑湿地整体上表现为大气中N₂O源.野慈姑湿地N₂O排放通量与间隙水盐度呈显著负相关关系.研究表明，对于亚热带河口区淡水感潮野慈姑湿地，施加量为120 kg·hm^-2·a^-1的模拟硫沉降显著降低其N₂O排放通量.

• Abstract：The effects of simulated sulfate deposition on N₂O fluxes were investigated in the freshwater tidal Sagittaria trifolia wetland in the Tajiaozhou of the Min River estuary. Monthly pulses of dissolved K₂SO₄ were added to the experiment sites on the neap days from December 2015 to October 2016. The treatments included the additions of dissolved K₂SO₄ at rates of 60,120 kg·hm^-2·a^-1 and the control(CK). The averaged N₂O fluxes were (58.06±23.07), (23.50±22.85) and (20.75±7.83) μg·m^-2·h^-1, respectively, in CK, 60 and 120 kg·hm^-2·a^-1 treatments. On the annual scale, 120 kg·hm^-2·a^-1 treatment significantly decrease the N₂O flux, however the 60 kg·hm^-2·a^-1 treatment had no significant inhibitory effect on N₂O flux. In whole the freshwater tidal Sagittaria trifolia wetland in the Tajiaozhou of the Min River estuary is a source of N₂O in the atmosphere. Simulated sulfate deposition increased the pore water SO₄^2- concentration. N₂O fluxes from the S. trifolia with simulated sulfate deposition demonstrated a significant negative correlation with pore water conductivity. The results indicate that higher dose of sulfate deposition (120 kg·hm^-2·a^-1) on the neap days suppresses N₂O flux from freshwater tidal S. trifolia wetland in subtropical estuary, and exerts a positive feedback in relation to acid rain problem.

• Key words：N₂O flux  SO₄^2- deposition  Sagittaria trifolia  tidal freshwater wetland  Min River estuary

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