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OALib Journal期刊
ISSN: 2333-9721
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长江口潮滩沉积物－水界面无机氮交换通量
DOI: 10.11821/xb200502016, PP. 328-336
Keywords: 无机氮,交换通量,沉积物－水界面,潮滩,长江口
Abstract:
对长江口滨岸潮滩7个典型断面三态氮的界面交换通量进行了三年多的季节性连续观测,结果表明无机氮的界面交换行为存在复杂的空间分异和季节变化。NO-3-N和NH+4-N的界面交换通量正负变化范围较大,分别介于-32.82~24.13mmol.m-2.d-1和-18.45~10.65mmol.m-2.d-1之间;而NOsup>-2-N的界面交换通量很小,仅为-1.15~2.82mmol.m-2.d-1。NO-3-N的界面交换具有明显的上下游季节性时空分异特征,而NH+4-N的界面交换则表现为南北岸季节性时空分异现象。盐度是控制长江口滨岸潮滩NH+4-N界面交换行为的主要因素,而沉积物粒度、水体NO-3-N浓度、沉积物有机质含量、水温和溶解氧含量则以不同的组合方式,共同制约着NO-3-N在潮滩界面交换的时空分异格局。
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