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人工浅水湖泊高含沙补水过程中叶绿素a浓度的变化

DOI: 10.11654/jaes.2013.09.021, PP. 1848-1854

Keywords: 东昌湖,补水,悬浮泥沙,叶绿素a,同步监测

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Abstract:

在2012年4月23日至26日高含沙的黄河水向东昌湖补水期间,分别对湖面12个监测点及从入湖口到出湖口的纵断面5个监测点同步取样、测流和测沙,从整体到局部分析了悬浮泥沙与叶绿素a浓度的变化。结果表明:补水前,湖区叶绿素a平均浓度为4.07μg·L-1,补水后达到7.74μg·L-1,其中黄河补水贡献了21.1%。在从入湖口到出湖口的纵断面中,入湖口附近监测点A、B叶绿素a浓度增幅由大变小,流速、悬浮泥沙均出现明显高峰,监测点C、D、E依次呈现递减趋势。补水期间,5个纵断面监测点叶绿素a浓度与悬浮泥沙含量呈现极显著负相关,相关系数达-0.81,而补水前后其相关系数仅在-0.43左右。湖面细颗粒悬浮泥沙占主导的监测点,叶绿素a浓度增幅大,反之,粗颗粒占主导的监测点,叶绿素a浓度增幅小,故可推断悬浮泥沙对叶绿素a的影响表现为“高浓度粗颗粒悬浮泥沙抑制叶绿素a浓度的增加,细颗粒或胶粒悬浮泥沙促进叶绿素a浓度的增加”,但这种影响只在补水短期内显著。因此,悬浮泥沙在黄河补水期间是影响叶绿素a浓度变化的主要水环境因素之一。

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