• 关键词：二甲基硫  排放通量  时空变化  潮滩湿地  黄河三角洲

• 基金项目：国家自然科学基金资助项目(No.41103036)

• 李新华
• 山东省农业可持续发展研究所, 济南 250100

• 孙志高
• 福建师范大学地理研究所, 湿润亚热带生态-地理过程教育部重点实验室, 福州 350007

• 孙文广
• 中科院烟台海岸带研究所, 烟台 264003

• 朱振林
• 山东省农业可持续发展研究所, 济南 250100

• 摘要：为了探讨黄河三角洲潮滩湿地系统二甲基硫(dimethylsulfide, DMS)排放的时空变化和主要影响因子,利用静态箱法监测了黄河三角洲高潮滩、中潮滩和低潮滩DMS通量和环境因子的年际变化.结果表明,从全年来看,黄河三角洲潮滩湿地系统是DMS的释放源,高潮滩、中潮滩和低潮滩释放DMS的通量范围依次为0.043~0.59μg·m^-2·h^-1、0.18~1.90μg·m^-2·h^-1和0.88~5.80μg·m^-2·h^-1,均值依次为0.33μg·m^-2·h^-1、0.95μg·m^-2·h^-1和2.18μg·m^-2·h^-1.黄河三角洲潮滩湿地DMS的释放通量具有明显的时空变化,其排放主要集中在植物生长季.潮滩湿地间DMS的排放通量差异显著(p < 0.05),表现为低潮滩>中潮滩>高潮滩,这种时空变化可能与季节、植被、环境因子、土壤基质等的空间变化有关.DMS的排放受到多种因素的影响,在高潮滩,0 cm地温对DMS排放通量影响显著;在低潮滩,0~5 cm土壤体积含水量对DMS排放通量影响显著,而在中潮滩则没有发现显著的影响因子.该研究成果可以为进一步研究黄河三角洲湿地硫循环及其对大气环境的影响提供基础数据.

• Abstract：The spatial and temporal variations of the fluxes of dimethylsulfide (DMS) and the key controlling factors in high tidal marsh (HTM), middle tidal marsh (MTM) and low tidal marsh (LTM) in the Yellow River estuary from April to December, 2012 were investigated by using static chamber-gas chromatography. The results showed that the DMS fluxes form HTM, MTM and LTM were 0.043~0.59μg·m^-2·h^-1, 0.18~1.90μg·m^-2·h^-1and 0.88~5.80μg·m^-2·h^-1, and the average fluxes were 0.33μg·m^-2·h^-1, 0.95μg·m^-2·h^-1and 2.18μg·m^-2·h^-1, respectively, indicating that the tidal marsh ecosystems in the Yellow River estuary acted as DMS source. Significant spatial and temporal variations of DMS emission were observed across the tidal marshes in the Yellow River estuary. The DMS emissions from the three tidal marshes were mainly focused on the growing season (from May to October) and differed significantly (p < 0.05), in the order of LTM >MTM>HTM. The spatial variations of DMS emission were related to the spatial variations of seasons, vegetations, environmental factors and soil substrate. The dominant factor affected the DMS emission in HTM was 0 cm temperature and that in LHM was 0~5 cm soil volumetric water, while no dominant factor was found in MHM, implying that the DMS fluxes from MHM might be influenced by many factors. The results of this paper can provide essential data for further studying the sulfur cycle in the natural wetland of the Yellow River estuary and its influence on atmospheric environment.

• Key words：dimethylsulfide  emission flux  spatial and temporal variations  tidal marsh  Yellow River estuary

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