Li Dong, Yao Peng, Zhao Bin, Wang Jin-peng, Pan Hui-hui
Huan Jing Ke Xue. 2015 Aug;36(8):2791-9.
Compositions and contents of sedimentary pigments were examined using high performance liquid chromatography in order to discuss the spatial distributions of phytoplankton primary production, phytoplankton functional type and the preservation efficiency of phytoplankton pigments and their influencing factors. The results showed that: chloropigments [Chlorins, including chlorophyll-a (Chl-a) and pheopigments (Pheo-a), such as pheophytin-a (PHtin-a), pheophorbide-a (PHide-a), pPheophytin-a (pPHtin-a), sterol chlorin esters (SCEs) and carotenol chlorin esters (CCEs)] were the major type of sedimentary pigments. The nutrients inputs from Changjiang Diluted Water and upwelling in the Zhe-Min coastal mud area were the major cause for the patchy distribution with high sedimentary chloropigment contents. Carotenoid contents showed no trending changes and exhibited high values in the Changjiang Estuary and Zhe-Min Coasts. Based on the relative proportions of each diagnostic carotenoid to the total diagnostic carotenoids in the sediments, the relative contributions of diatoms, dinoflagellates, prymnesiophytes, prasinophytes, cryptophytes and cyanobacterias in the phytoplankton fuctional types were 48.8% +/- 17.4%, 10.7% +/- 11.5%, 8.1% +/- 7.2%, 18.6% +/- 8.2%, 9.4% +/- 6.4% and 4.3% +/- 3.2%, respectively. The preference for external environmental conditions (e.g., nutrient level and water salinity) was the main cause for the decreasing trends of diatoms and dinoflagellates proportions and the increasing trends of prasinophytes, cryptophytes and cyanobacterias seawards. Based on the spatial distribution of Chl-a/Pheo-a ratios, the higher preservation efficiencies of sedimentary pigments in the coastal regions (e.g., outer edge of maximum turbidity zone in the Changjiang Estuary, mouth of the Hangzhou Bay and upwelling region in the Zhe-Min Coast) were mainly due to the higher sedimentation rate and seasonal occurrences of hypoxia in bottom water, and these regions with higher sedimentary pigment preservation efficiencies were probably ideal areas for the marine eco-environmental evolutions. The bad sedimentary environment caused by the water exchange inside and outside of Hangzhou Bay was the dominant reason for the low sedimentary pigment contents and preservation efficiencies in this region.
为探讨浮游植物初级生产力、浮游植物功能类型的空间分布以及浮游植物色素的保存效率及其影响因素，采用高效液相色谱法对沉积色素的组成和含量进行了研究。结果表明：叶绿素类色素（包括叶绿素-a（Chl-a）和脱镁叶绿素类色素（Pheo-a），如脱镁叶绿酸-a（PHtin-a）、脱镁叶绿酸-a（PHide-a）、焦脱镁叶绿酸-a（pPHtin-a）、甾醇叶绿素酯（SCEs）和胡萝卜醇叶绿素酯（CCEs））是沉积色素的主要类型。长江冲淡水和浙闽沿岸泥质区上升流带来的营养物质输入是沉积叶绿素类色素含量呈斑块状分布的主要原因。类胡萝卜素含量无明显变化趋势，在长江口和浙闽沿岸呈现高值。根据沉积物中各诊断性类胡萝卜素占总诊断性类胡萝卜素的相对比例，浮游植物功能类型中硅藻、甲藻、颗石藻、绿藻、隐藻和蓝细菌的相对贡献分别为48.8%±17.4%、10.7%±11.5%、8.1%±7.2%、18.6%±8.2%、9.4%±6.4%和4.3%±3.2%。硅藻和甲藻比例下降以及绿藻、隐藻和蓝细菌比例向海增加的趋势，主要是由于它们对外部环境条件（如营养水平和海水盐度）的偏好。根据Chl-a/Pheo-a比值的空间分布，沿海地区（如长江口最大浑浊带外缘、杭州湾口和浙闽沿岸上升流区）沉积色素的保存效率较高，主要是由于沉积速率较高和底层水季节性缺氧的出现，而这些沉积色素保存效率较高的地区可能是海洋生态环境演化的理想区域。杭州湾内外水体交换导致的不良沉积环境是该区域沉积色素含量和保存效率较低的主要原因。
