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引用本文:赵巧华,张运林,秦伯强.太湖梅梁湾水体中介质吸收谱特性的空间变化.湖泊科学,2006,18(6):627-635. DOI:10.18307/2006.0611
ZHAO Qiaohua,ZHANG Yunlin,QIN Boqiang.Spatial variations of spectral absorption of medium in the Meiliang bay of Lake Taihu. J. Lake Sci.2006,18(6):627-635. DOI:10.18307/2006.0611
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太湖梅梁湾水体中介质吸收谱特性的空间变化
赵巧华1,2,3,张运林1,秦伯强1
1.中国科学院南京地理与湖泊研究所,南京 210008;2.中国科学院研究生院, 北京 100049;3.南京信息工程大学环境科学与工程系,南京 210044
摘要:
水体中藻类颗粒物、非藻类颗粒物、CDOM的光谱吸收特性的变化是整个水体对光吸收特性变化的源.本文针对梅梁湾水体中介质的吸收系数,分析了总悬浮颗粒物、藻类颗粒物、非藻类颗粒物和CDOM的标准化谱吸收数的变化.结果表明:藻类颗粒物、非藻类颗粒物组成比例的空间分布不同,是造成该区域总悬浮颗粒物标准化谱吸收系数空间变化的原因.且标准化谱吸收系数的变化主要集中在400-425 nm及600-690 nm两个波段;就谱形而言,总悬浮颗粒物的谱吸收特性主要表现为非藻类颗粒物的吸收特点,即在该区域的水体中,非藻类颗粒物是总悬浮颗粒物吸收特性的主要贡献者;藻类颗粒物、非藻类颗粒物和CDOM的吸收系数的空间变化主要是由各自的浓度变化造成的,即在采样时间内,梅梁湾的水体中,藻类颗粒物中的各种组成色素、非藻类颗粒物及CDOM中的腐殖酸和棕黄酸的组成比例在空间上基本没有太大的变化.另针对藻类颗粒物的吸收特性,本文还对比分析了用甲醇浸泡法和光谱标准分离法分离的藻类颗粒物的吸收特性,发现相对光谱标准分离法来说,甲醇浸泡法会造成藻类颗粒物吸收系数的较大波动.
关键词:  标准化吸收系数谱  方差谱  平均谱  太湖
DOI:10.18307/2006.0611
分类号:
基金项目:中国科学院知识创新战略行动项目“长江中下游地区湖泊富养化发生机制与控制对策”KZCX1-SW-12资助.
Spatial variations of spectral absorption of medium in the Meiliang bay of Lake Taihu
ZHAO Qiaohua,ZHANG Yunlin,QIN Boqiang
Abstract:
The variations of the spectral absorption coefficient of natural water can be attributed to three prinripal factors-alga particles, nonalga particles and CDOM. Based on the absorption coefficients of tlie three laclors in Mei-liang bay, the variations in spectral absorption coefficient was analyzed. The result shows That the spatial variations of normalized spectral absorption coefficients of total particles are caused by the difference in alga particles:nonalga particles ratio, and the variance centralize between 400-425 nm and 600-690 nm. As far as the sperlral shape is concerned,there is prominent characteristic of nonalga particles in spectral absorption coefficienls of total particles. Namely nonalga particles dominant the spectral absorption coefficients of total particles. The spatial variations in absorption coefficient of alga particles,nonalga, particles and CDOM are caused by the differenrt* of iheir conren-tration. Namely,in the time of sampling, there is no evident difference in their constitutes of pigments for alga particles,and. humic and fulvic acid for nonalga particles and CDOM of the water in Meiliang bay. In addition, the absorption characteristic of alga particles separated by the method based on spectral criteria was analyzed and compared with that by methanol-extractions. We found that the absorption coefficients of latler exhibits significant fluctuation.
Key words:  Normalized absorption  spectra variance apectra  mean spectra  Lake Taihu
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