| 滇池水体光学物质的吸收特性研究 |
| 摘要点击 6597 全文点击 4473 投稿时间：2010-02-24 修订日期：2010-03-29 |
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| 中文关键词 滇池 吸收系数 比吸收 颗粒物 有色可溶性有机物 |
| 英文关键词 Lake Dianchi absorption coefficients specific absorption coefficients suspended particles chromophoric dissolved organic matter(CDOM) |
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| 中文摘要 |
| 基于2009年9月在滇池的野外采样，分析了滇池水体中光学活性物质的吸收特性及其空间分布、与水体组分浓度的关系、各光学活性物质吸收对总吸收的贡献率、滇池水体吸收特性与其他二类水体的异同性等.结果表明，总颗粒物吸收光谱曲线与浮游藻类吸收光谱曲线形状相似，浮游藻类吸收在总颗粒物吸收中占主导；440、 624和675 nm处的浮游藻类吸收aph与叶绿素a浓度呈现显著正相关，蓝藻是滇池水体的优势藻种；滇池北部湖区藻类密集，富营养化程度较南部湖区严重.与其他二类水体的吸收特性相比，滇池水体既表现出相似性，又表现出一定的差异性.滇池各吸收特性的数值都落在之前二类水体的研究结果范围之中，这体现了相似性；而差异性主要表现在：①非藻类颗粒物吸收光谱曲线斜率Sd均值略高于其他二类水体；②有色可溶性有机物（chromophoric dissolved organic matter，CDOM）吸收光谱曲线斜率Sg均值相对其他二类水体偏小；③浮游藻类比吸收系数大致处于中间水平，造成浮游藻类比吸收不同的原因是其受不同地区、不同季节和浮游植物种群结构等的影响. |
| 英文摘要 |
| A field investigation in Lake Dianchi was carried out in November, 2009, and a dataset including absorption coefficients and concentration of water components was collected. Absorption properties and its spatial distribution of Lake Dianchi have been systematically analyzed, the results show that: ① Absorption spectral curve of total particles (ap) are similar with that of phytoplankton(aph), which indicates that phytoplankton absorption dominates absorption of total suspended particles; ②Significant relationships are found between aph(440),aph(624) ,aph(675) and concentration of chla, and cyanophyta dominats the quantity of the algae in water columns; ③There are more phytoplankton existed in northern lake than other areas because of higher level of eutrophication. Comparing with other water columns, discrepancies mainly appear as below: ①The mean value of slope of absorption spectral curve of non-algal particles (Sd) in Lake Dianchi is much bigger than that in other case-Ⅱ waters; ② The mean value of slope of absorption spectral curve of chromophoric dissolved organic matter(CDOM) Sg in Lake Dianchi is much smaller than that in other case-Ⅱ waters; ③ Specific absorption of phytoplankton (a*ph) at 440 nm and 675 nm is at intermediate level, and a*ph value is susceptible to different regions, seasons, population structure of phytoplankton and so on. |
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