| 三峡水库成库初期营养盐与浮游植物分布特征 |
| 摘要点击 3702 全文点击 1569 投稿时间：2005-06-28 修订日期：2005-08-25 |
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| 中文关键词 三峡水库 营养盐 浮游植物 |
| 英文关键词 Three Gorges Reservoir nutrient phytoplankton |
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| 中文摘要 |
| 根据2003-09-08～2003-09-15航行11个点位测试数据,分析了三峡水库成库后营养元素及浮游生物量的分布特征,初步探讨了营养盐分布与Chla的关系.结果表明,调查区域营养盐浓度较高,其中TN各测点均超过国家地表水环境质量标准Ⅲ类水标准,含量范围为1.01～1.35 mg·L-1.TP含量范围为0.028～0.054 mg·L-1;K含量范围为2.80～3.44 mg·L-1;TOC含量范围为1.92～2.59 mg·L-1,Chla含量范围为1.58～7.35mg·m-3,平均浓度为4.69 mg·m-3.利用相关分析方法,分析了Chla与营养盐之间的关系,表明Chla与NO3--N成显著正相关(r=0.728 7);与浊度成显著负相关(r=-0.920 7).利用系统聚类方法分析三峡水库水体指标,随长江流向明显分为3类,即上游区(长寿、涪陵、丰都、忠县)、中游区(万州、云阳、奉节)和下游区(巫山).硅藻在4个测点均为优势种群,占总量的86%,平均为129 844个/L,浮游植物量沿水流方向有增高趋势. |
| 英文摘要 |
| The distribution features of nutrient and chlorophyll a were determined by cruise during 2003-09-08～2003-09-15 with 11 sites in the Three Gorges reservoir.The results showed that the concentration of nitrogen was exceed the national surface water body quality standard Ⅲ.The concentration of nitrogen range 1.01～1.35 mg·L-1;Total phosphorus range 0.028～0.054 mg·L-1;Kalium range 2.80～3.44 mg·L-1;Total organic carbon range 1.92～2.59 mg·L-1;Chlorophyll a range 1.58～7.53 mg·m-3.The average concentration of chlorophyll a was 4.69 mg·m-3 at surface layer.The correlation of nutrient and chlorophyll a were researched.It indicated there was a significant positive correlation(r=0.728 7) between chlorophyll a and NO3--N.There was a significant negative correlation(r=(-0.920 7)) between chlorophyll a and turbidity.Using the method of system cluster,it showed there was distinct distribution features which can be divided into three clusters.The upper river areas cluster included Changshou,Fuling,Fengdu,Zhongxian; The middle river areas cluster included Wanzhou,Yunyang and Fengjie;The down river areas included Wushan.The rate of diatom in phytoplankton was about 86%. Diatom was absolute predominance on 4 monitoring sites.The average of diatom was(129 844)cells·L-1.Amount of phytoplankton was increased along the river flow direction. |
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