| 骆传婷,陈友媛,张 超.人工浅水湖泊高含沙补水过程中叶绿素a浓度的变化[J].农业环境科学学报,2013,32(9):1848-1854. |
| 人工浅水湖泊高含沙补水过程中叶绿素a浓度的变化 |
| The Concentration Variation of Chlorophyll-a in Artificial Shallow Lake During High Suspended Sediment Water Supplement |
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| DOI：10.11654/jaes.2013.09.021 |
| 中文关键词: 东昌湖 补水 悬浮泥沙 叶绿素a 同步监测 |
| 英文关键词: Dongchang Lake water supplement suspended sediment chlorophyll-a synchronously monitoring |
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| 中文摘要: |
| 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4.07 μg·L-1，补水后达到7.74 μg·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。 |
| 英文摘要: |
| The water supplement from Yellow River to Dongchang Lake was conducted on April 23, 2012 to April 26, 2012. Sample collection, flow velocity and suspended sediment concentration monitoring were synchronously implemented at 1~12 monitoring sites in the whole lake and 5 monitoring sites（A~E） of the longitudinal profile from inlet to outlet, respectively. The variation of suspended sediment（SS） concentrations and chlorophyll-a concentrations were analyzed from the whole lake to the longitudinal profile. Average concentration of chlorophyll-a was 4.07 μg·L-1 before the water supplement and 7.74 μg·L-1 after the water supplement, among which the Yellow River water contributed 21.1%. Increase in chlorophyll-a concentration from big to small , velocities and SS concentrations obviously appeared the peak values in A, B, but C, D, E showed a decreasing trend in turn. Chlorophyll-a concentrations of the five monitoring sites presented highly significant negative correlation with SS concentrations by 0.81 within the process of water supplement, while only about 0.43 without water supplement. Besides, monitoring sites in the lake which SS contents dominated by fine particles, Chlorophyll-a concentrations had a large rate of increase, whereas SS dominated by coarse particles showed a small increase of chlorophyll-a concentrations. In summary, it can infer that high concentration of coarse particles of suspended sediment inhibited the increase of chlorophyll-a concentration. While, fine particles or colloidal particles of suspended sediment offered a chance to increase chlorophyll-a concentration. These effects only happened in the short-term of the replenishment. The results showed suspended sediment might be one of the main factors of water environment that affected the variation of chlorophyll-a concentrations under the water supplement period. |
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