Optically active substances and their contributions to the underwater light climate in Lake Taihu, a large shallow lake in China
Optically active substances and their contributions to the underwater light climate in Lake Taihu, a large shallow lake in China
复制标题
太湖光学活性物质及其对水下光气候的贡献
DOI：
10.1127/1863-9135/2007/0170-0011
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发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
Bing Zhang
中科院分区：
文献类型：
--
作者：
Yunlin Zhang;Ronghua Ma;Chengfeng Le;Bing Zhang
关于光学活性物质和光学条件的数据集很少，无法区分每种物质对湖中光衰减的相对贡献。为了满足这一需求，2004年10月在中国大型浅湖太湖的67个地点测量了水下光合有效辐射（PAR）、光学参数和三种光学活性物质的浓度，即特里普顿（非浮游植物颗粒物）、叶绿素-a（Chl-a）、发色溶解有机物（CDOM）。 确定了活性物质及其对水下光气候的相对贡献。不同地点的PAR漫衰减系数Kd(PAR)在0.87～12.43 m -1 之间变化，平均值为4.42 m -1 。光活性物质和PAR衰减存在显着的空间差异，在东太湖、胥口湾、贡山湾等水生植物为主的海湾，浓度较低，光衰较弱；而在湖中心、西南地区、梅梁湾等开阔水域和藻类为主的区域，浓度较高，光衰较强。 Tripton、Chl-a 和 CDOM 对光衰减的平均相对贡献分别为 Kd(PAR) 的 82.6%、9.7% 和 6.8%。 Tripton 是 Kd(PAR) 的主要组成部分，Kd(PAR) 97.5% 的变异平均值可以用 Tripton 来解释。秋季，CDOM对光衰减的相对贡献低于浮游植物。我们得出结论，悬浮颗粒物，而不是溶解有机物，是太湖 PAR 衰减的主导因素。
There are few data sets on optically active substances and optical conditions to partition the relative contribution of every substance on light attenuation in a lake. To address this need, underwater photosynthetically active radiation (PAR), optical parameters and concentrations of three optically active substances, tripton (non- phytoplankton particulate matter), chlorophyll-a (Chl-a), chromophoric dissolved organic matter (CDOM) were measured at 67 sites in Lake Taihu, a large shallow lake in China in October 2004. The spatial variation of optically active substances and their relative contributions to the underwater light climate were determined. The PAR diffuse attenuation coeffi cient Kd(PAR) at different sites varied between 0.87 and 12.43 m -1 , with a mean of 4.42 m -1 . Sig- nifi cant spatial differences were found for optically active substances and PAR attenuation, with low concentrations and weak light attenuation in macrophyte-dominated bays such as East Lake Taihu, Xukou Bay and Gongshan Bay, and high concentrations and strong light attenuation in the open water and algae-dominated areas such as the center of the lake, southwestern region, and Meiliang Bay. The mean relative contributions of tripton, Chl-a, and CDOM to light attenuation were 82.6 %, 9.7 %, and 6.8 % of Kd(PAR), respectively. Tripton was the dominant constituent of Kd(PAR), and mean of 97.5 % of the variation in Kd(PAR) could be explained by tripton. In autumn, the relative contribution of CDOM to light attenuation was lower than that of phytoplankton. We conclude that suspended par- ticulate matter, rather than dissolved organic matter, is the dominant factor for PAR attenuation in Lake Taihu.
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影响因子：
2.8
作者：
L. Lund-Hansen
通讯作者：
L. Lund-Hansen
DOI：
10.2307/1353240
发表时间：
2001-06-01
期刊：
ESTUARIES
影响因子：
--
作者：
Gallegos, CL
通讯作者：
Gallegos, CL
影响因子：
12.8
作者：
S. C. Yoro;C. Panagiotopoulos;R. Sempéré
通讯作者：
S. C. Yoro;C. Panagiotopoulos;R. Sempéré
影响因子：
5.4
作者：
HAKANSON, L
通讯作者：
HAKANSON, L
影响因子：
5.6
作者：
J. Kirk
通讯作者：
J. Kirk