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应用生态学报 ›› 2018, Vol. 29 ›› Issue (1): 269-277.doi: 10.13287/j.1001-9332.201801.035

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潮汐作用下干湿交替对黄河三角洲盐沼湿地净生态系统CO2交换的影响

贺文君1,2, 韩广轩1*, 许延宁1, 张希涛3, 王安东3, 车纯广3, 孙宝玉4, 张孝帅1   

  1. 1中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 山东烟台 264003;
    2中国科学院大学, 北京 100049;
    3山东省黄河三角洲国家级自然保护区管理局, 山东东营 257091;
    4华东师范大学生态与环境科学学院, 上海 200241
  • 收稿日期:2017-07-25 出版日期:2018-01-18 发布日期:2018-01-18
  • 通讯作者: * E-mail: gxhan@yic.ac.cn
  • 作者简介:贺文君,女,1992年生,硕士研究生. 主要从事全球变化下湿地碳循环研究. E-mail: wjhe@yic.ac.cn
  • 基金资助:
    本文由国家自然科学基金项目(41671089)和中国科学院科技服务网络计划项目(KFJ-EW-STS-127)资助

Effects of drying and wetting cycles induced by tides on net ecosystem exchange of CO2 over a salt marsh in the Yellow River Delta, China.

HE Wen-jun1,2, HAN Guang-xuan1*, XU Yan-ning1, ZHANG Xi-tao3, WANG An-dong3, CHE Chun-guang3, SUN Bao-yu4, ZHANG Xiao-shuai3   

  1. 1Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China;
    3Administration Bureau of the Yellow River Delta National Nature Zone Reserve, Dongying 257091, Shandong, China;
    4School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
  • Received:2017-07-25 Online:2018-01-18 Published:2018-01-18
  • Contact: * E-mail: gxhan@yic.ac.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41671089) and the Science and the Technology Service Network Initiative of the Chinese Academy of Sciences (KFJ-EW-STS-127).

摘要: 潮汐作用作为盐沼湿地独特的水文特征能在短时间内强烈影响盐沼湿地的碳平衡.利用涡度相关和微气象监测技术,对黄河三角洲盐沼湿地净生态系统CO2交换(NEE)和环境因子进行监测,并同步监测潮汐变化,探究潮汐过程及潮汐作用下干湿交替对NEE的影响.结果表明: 潮汐过程促进了白天生态系统CO2的吸收但未对夜晚CO2的释放产生显著影响,潮汐淹水成为影响白天NEE的主要因子.干旱阶段和湿润阶段NEE的日平均动态均呈“U”型曲线,但干旱阶段NEE的变幅较小.干湿交替增强了白天生态系统CO2的吸收,干旱阶段最大光合速率(Amax)、表观量子产量(α)和生态系统呼吸(Reco)的均值均高于湿润阶段.此外,干湿交替减少了盐沼湿地夜晚NEE释放的同时增强了其温度敏感性.

关键词: 盐沼湿地, 干湿交替, 潮汐, 净生态系统CO2交换

Abstract: As a unique hydrological characteristic, the tidal action can strongly affect carbon balance in a salt marsh despite their short duration. Using the eddy covariance technique, we measured the net ecosystem CO2 exchange (NEE) and its environmental factors and tidal change over a salt marsh in the Yellow River Delta. It aimed to investigate the effect of tidal process and drying and wetting cycles induced by tides on NEE. The results showed that the tidal process promoted the daytime CO2 uptake, but it didn’t clearly affect the nighttime CO2 release. Tidal inundation was a major factor influencing daytime NEE. The diurnal change of NEE showed a distinct U-shaped curve on both drought and wet stages, but not with substantial variation in its amplitude during the drought stage. The drying and wetting cycles enhanced the absorption of daytime CO2. Under drought stage, the mean of the maximum photosynthetic rate (Amax), apparent quantum yield (α) and ecosystem respiration (Reco) were higher than those in wet stage. In addition, the drying and wetting cycles suppressed the nighttime CO2 release from the salt marsh but increased its temperature sensitivity.

Key words: tidal action, drying and wetting cycle, net ecosystem CO2 exchange, salt marsh