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2011年春季东海赤潮高发区尿素分布特征及影响因素

DOI: 10.3969/j.issn.0253-4193.2015.02.007

Keywords: 长江口 东海 赤潮 尿素 分布

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Abstract:

2011年春季(3-5月)在东海赤潮高发区硅藻和甲藻赤潮暴发及演替过程中进行了3个航次的现场调查,通过对调查资料的分析,对该海域尿素的含量变化、平面分布特征及影响因素进行了初步探讨.结果表明:调查海域尿素的含量在检出限~6.32 μmol/L范围内,平均浓度为(1.33±0.84) μmol/L,是该海域一种重要的溶解有机氮组分.其中,在DIN中所占比例8.73%~18.04%,在DON中所占比例5.63%~15.73%.赤潮的暴发对尿素含量和分布影响较大,能够影响并控制该海区尿素的实际浓度水平和分布特征.其中,硅藻赤潮暴发前后尿素和DIN含量下降百分比分别为36.67%和49.88%,甲藻赤潮暴发前后尿素和DIN含量下降百分比分别为8.78%和28.97%.硅藻赤潮期,尿素的高值区和叶绿素高值区一致,其含量明显高于正常海区;甲藻赤潮期,叶绿素的高值区对应着尿素低值区,赤潮区内尿素含量普遍降低至1 μmol/L以下,尿素是一种能够被研究海区甲藻类浮游植物吸收利用的有效氮源.在调查海域大规模硅藻和甲藻赤潮暴发和演替期间,尿素的平面分布上未呈现明显的近岸低、远岸高的分布特点,与盐度数值没有明显的相关性,该时期陆源输入不是影响该海域尿素分布的主要因素

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