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海洋科学  2012 

大连湾沉积物-水界面BAP 交换通量的影响因素

, PP. 117-122

Keywords: 疏浚,沉积物,生物可利用磷,交换通量

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Abstract:

利用实验室培养法研究了不同因素对大连湾沉积物-水界面间生物可利用磷(BAP)交换通量的影响,并利用实验室培养法和间隙水浓度梯度法估算了大连湾已疏浚区和疏浚点邻近海域沉积物-水界面BAP的交换通量。结果表明,随着上覆水pH和温度的增加,BAP由沉积物向水体释放量逐渐增加灭菌和贫氧条件下,也会导致沉积物BAP的释放量增加;上覆水中磷酸盐浓度的升高会导致BAP由沉积物向水体释放通量降低,且随着上覆水磷酸盐浓度的不断升高,BAP逐渐转化为由水体向沉积物中扩散。实验室培养法和间隙水浓度梯度法测定结果均显示,受到疏浚工程的影响,大连湾疏浚点邻近海域沉积物-水界面BAP的年均通量大于已疏浚区。不同季节,大连湾沉积物-水界面BAP的交换通量有所不同,表现为夏季最高,冬季最低。但由于受疏浚活动的影响,冬季疏浚点邻近海域沉积物-水界面BAP的交换通量也维持在较高水平。

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