| 摘要: |
| 海堤、防波堤等硬质化人工设施阻碍了盐沼湿地水文连通，影响了盐沼湿地植被恢复和生态功能发挥。目前已有大量生态工程通过水文调控恢复湿地，但这些工程效果研究多聚焦于水文条件对生物多样性的影响，而对固碳减排功能的影响方面则较为欠缺。本研究在杭州湾北岸鹦鹉洲湿地开展大规模控制实验，以探究水文连通对盐沼湿地植物生长、温室气体排放及土壤有机碳含量的影响。结果显示，水文连通区盐沼芦苇（Phragmites australis）株高、生物量和净初级生产力显著大于水文静止区；两个研究区年均CO2吸收通量无显著差异，但连通区CH4排放通量显著低于静止区。这表明水文连通能够促进芦苇的生长，并增加净初级生产力，同时可有效抑制CH4排放，进而促进湿地的固碳减排功能。 |
| 关键词: 湿地生态学|盐沼|芦苇|水文条件|固碳 |
| DOI：10.3969/J.ISSN.2095-4972.20231222002 |
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| 基金项目:上海市2022年度“科技创新行动计划”社会发展科技攻关项目（22dz1202600）；上海市海洋局科研项目（沪海科2021-04） |
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| Impact of hydrological connectivity on the carbon sequestration and emission reduction function of salt marshes |
| CUI Yaonan,DAI Yuhang,YANG Hualei,CHEN Xuechu |
| (School of Ecological and Environmental Sciences，East China Normal University，Shanghai 200241，China;Shanghai Water Way Engineering Design and Consulting Co.，Ltd.，Shanghai 200120，China;State Key Laboratory of Estuarine and Coastal Research，Center for Blue Carbon Science and Technology，East China Normal University，Shanghai 200241，China) |
| Abstract: |
| The hardened artificial structures such as seawalls and breakwaters have impended hydrological connectivity in salt marshes，affecting vegetation restoration and associated ecological functions. Many ecological projects have been carried out to restore wetlands through hydrological regulation. However, most studies have focused on the effects of hydrological conditions on biodiversity，while the effects on the function of carbon sequestration and emission reduction are relatively lacking. This study conducted a large-scale controlled experiment in Yingwuzhou wetland located in northern Hangzhou Bay to explore the effects of hydrological connectivity on plant growth，greenhouse gas emissions and soil organic carbon content in salt marshes. Results indicated that in hydrological connection area，the plant height，biomass，and net primary productivity of Phragmites australis were significantly greater than those in hydrostatic area. While the annual CO2 absorption flux showed no significant difference between the two study areas，the CH4 emission flux in the flow area was significantly lower than that in the hydrological connection area. It suggests that hydrological connectivity can promote the growth of Phragmites australis and increase net primary productivity，while effectively inhibiting CH4 emissions the conectivity can promote the carbon sequestration and emission reduction functions of the salt marshes. |
| Key words: wetland ecology|salt marshes|Phragmites australis|hydrological conditions|carbon sequestration |
