胶州湾潮滩湿地CHBr3通量特征及影响因素研究

在2016年7月~2017年5月期间，运用静态箱法对胶州湾潮滩湿地系统的CHBr₃排放通量进行了观测，并对影响CHBr₃通量的主要影响因子进行了探究.结果表明，胶州湾潮滩湿地是CHBr₃的排放源，互花米草湿地和光滩释放CHBr₃的通量均值分别为10.92nmol/（m²×d）和8.96nmol/（m²×d），说明互花米草湿地在一定程度上能够促进CHBr₃的排放.不同潮滩湿地之间CHBr₃的排放通量有明显区别.互花米草湿地在夏秋季节较高的CHBr₃通量可能主要是受温度和植被生物量的影响，光滩在冬春季节较高的CHBr₃通量可能与冻融循环过程有关.胶州湾潮滩湿地环境因素变化比较复杂，CHBr₃的排放通量受多种因素的影响.温度对CHBr₃排放通量的影响显著，而植被生长状况、水盐条件和营养元素等对CHBr₃排放通量的影响也不容忽视.

CHBr3 fluxes and controlling factors in tidal flat wetland of Jiaozhou Bay

Characteristics of methenyl bromide (CHBr₃) fluxes from tidal wetlands of the Jiaozhou Bay were observed using static flux chambers methods during 2016/2017, and the key factors affecting CHBr₃ fluxes were discussed. The results showed that CHBr₃ average fluxes from S. alterniflora marsh and bare flat marsh were 10.92nmol/(m²×d) and 8.96nmol/(m²×d), respectively, indicating that the tidal marsh ecosystems in the Jiaozhou Bay acted as CHBr₃ source. It indicates that S. alterniflora marshes could promote CHBr₃ emissions to some extent. The emission fluxes of CHBr₃ between different tidal marshes was distinctly different. The higher CHBr₃ emissions from the S. alterniflora marshes were occurred in summer and autumn were probably related to the effects of temperature and vegetation biomass. The higher fluxes of CHBr₃ in bare flat during early spring and winter may be related to the freeze-thaw cycle. The change of environmental factors in the tidal flat marsh of Jiaozhou Bay was complex, and the emission fluxes of CHBr₃ were affected by many factors. The dominant factor affected the CHBr₃ emission in S. alterniflora marsh of Jiaozhou Bay was temperature, while the influences of vegetation growth status and water and salinity condition and nutrient elements on the CHBr₃ fluxes characteristics might not be ignored.