Zhang Yun-lin, Qin Bo-qiang
Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2006 Dec;27(12):2439-44.
Total 92 sampling waters were collected from different lake regions in Lake Taihu from May to August in 2005. Absorption coefficients of total particles and chromophoric dissolved organic matter (CDOM), beam attenuation coefficient, scattering coefficients, backscattering coefficients were measured and calculated. Spatial distributions of chlorophyll a, pheophytins concentrations, spectral features of total absorption coefficients and backscattering coefficients were also discussed. Chlorophyll a, pheophytins concentrations were in the range of 3.9 - 149.8 microg x L(-1) with a mean value of (38.14+/-28.89)microg x L(-1) ; 0 - 45.8 microg x(L-1) with a mean value of (8.49+/-7.24) microg x L(-1), respectively. A significant spatial difference was found for chlorophyll a, pheophytins concentrations with lower values in lake center, and typical macrophyte lake regions such as East Lake Taihu, Xukou Bay and Gonghu Bay. Similar significant spatial difference was found for total absorption coefficients and backscattering coefficients with lower values in typical macrophyte lake regions such as East Lake Taihu, Xukou Bay and Gonghu Bay. at(440) and bt(550) ranged from 0.86 to 23.25m(-1) with a mean value of (6.21+/-33.31)(m1)', from 0.05 to 2.25(m-)1 with a mean value of (0.72 +/-0.52)m(-1). Total absorption coefficients increased from 00 to 650nm with a peak near 680nm and increased from 720 to 750nm due to pure water absorption. Total backscattering coefficients generally decreased from 400 to 750nm An optimum band combination of reflectance R (706)/R (682) was selected to model chlorophyll a, pheophytins concentrations in Lake Taihu. Determination coefficients retrieving chlorophyll a concentrations, sum of chlorophyll a and pheophytins concentrations were 0.823, 0.864 5 based on reflectance ratio R (706) /R (682), respectively. Retrieval model of phytoplankton pigment can be used to all the lake including macrophyte lake regions with leaving-water reflectance affected by lake sediment and submerged plants.
2005年5月至8月，从太湖不同湖区共采集了92个水样。测量并计算了总颗粒物和发色溶解有机物（CDOM）的吸收系数、光束衰减系数、散射系数和后向散射系数。还讨论了叶绿素a、脱镁叶绿素浓度的空间分布，总吸收系数和后向散射系数的光谱特征。叶绿素a、脱镁叶绿素浓度范围分别为3.9 - 149.8μg·L⁻¹，平均值为(38.14±28.89)μg·L⁻¹；0 - 45.8μg·(L⁻¹)，平均值为(8.49±7.24)μg·L⁻¹。叶绿素a、脱镁叶绿素浓度存在显著的空间差异，湖心以及典型的大型植物湖区如太湖东部、胥口湾和贡湖湾的值较低。总吸收系数和后向散射系数也存在类似的显著空间差异，在太湖东部、胥口湾和贡湖湾等典型的大型植物湖区值较低。at(440)和bt(550)范围分别为0.86至23.25m⁻¹，平均值为(6.21±33.31)(m⁻¹)，0.05至2.25(m⁻¹)，平均值为(0.72±0.52)m⁻¹。总吸收系数从00至650nm增加，在680nm附近有一个峰值，并且由于纯水吸收在720至750nm增加。总后向散射系数一般从400至750nm降低。选择反射率R(706)/R(682)的最佳波段组合来模拟太湖中叶绿素a、脱镁叶绿素浓度。基于反射率比R(706)/R(682)，反演叶绿素a浓度、叶绿素a和脱镁叶绿素浓度总和的决定系数分别为0.823、0.864 5。浮游植物色素反演模型可用于所有湖泊，包括大型植物湖区，其中离水反射率受湖泊沉积物和沉水植物影响。
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