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潮滩“干湿过程”模式下营养盐的迁移、转化微观实验模拟

, PP. 169-175

Keywords: 干湿过程,营养盐,迁移与转化模式,实验模拟,潮滩,长江口

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Abstract:

潮滩是联系陆地生态系统和海洋生态系统的交互过渡带,与陆地湖泊、河流和深海系统相比有其特殊性和复杂性.在潮汐作用下由于潮滩受潮水周期性浸没和暴露的影响,使得潮滩界面成为一个典型的沉积物-水-气周期性交互作用界面.潮水的周期性涨退将诱使潮滩沉积物中发生一系列的物理、化学和生物变化[1].在暴露期间,因蒸发作用潮滩沉积物可能会发生失水现象,并引起沉积物孔隙水发生迁移和水溶性物质扩散梯度发生变化[2,3].在暴露失水过程中,空气也可能会占据沉积物间隙,并引起潮滩沉积物物理结构发生变化,加剧了沉积物-气界面之间需氧过程的发生[4,5].

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