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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
The Role of Freshwater Phytoplankton in Formation of the Enhanced Productivity Region in the Ob-Yenisei Shallow Waters
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In this study, two extracting methods (sonication and dispersing) and three solvents (90% acetone, N,N'-dimethylformamide and methanol) were compared for their ability to extract chlorophyll a of freshwater phytoplankton.
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There is a great abundance of brackish and freshwater phytoplankton in the dilution zone, but these cells are dead or almost dead; these observations coincide with the low concentrations of chlorophyll a.
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Qualitative and quantitative changes in the freshwater phytoplankton from one of the largest lakes in Potter Peninsula were studied during the summer period of 1995/1996.
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The effect of light fluctuations was tested at two average irradiances: low, 25?μmol?quanta?m-2?s-1 and high, 100?μmol?quanta?m-2?s-1 in 2- and 18-species communities of freshwater phytoplankton.
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| | It is determined by transmited light microscopy that the abundant amorphous organic matter (AOM) is contained in the lacustrine dark mudstones of the Palaeogene Wengchang and Enping Formations. The AOM of the Wenchang Formation, mixed with the debis of Pediastrum, is considered to be produced from phytoplankton of fresh lake. The tiny debris of the Enping Formation , determined as AOM under transmitted light, can be recognized as subcoaly matter (terrestrial phytoclast) under TEM. The above results show tha... | | 普通透射光镜观察结果表明,珠三坳陷早第三纪文昌组和恩平组的湖相暗色泥岩中都含有丰富的无定形有机质。文昌组的无定形有机质中含有盘星藻碎屑,属淡水浮游植物质的无定形有机质。透射电镜揭示,思平组泥岩中被透射光镜确定为无定形有机质的微屑实为煤质体(陆源植屑)。因此,文昌组和思平组的有机质类型反映了完全不同的古湖泊学特征。文昌组的无定形有机质反映了古湖泊表层水的高生产力和湖底水体的贫氧环镜。思平组的陆源植屑堆积与保存是古湖泊退缩消亡期的产物。 | | 文摘来源 | |   |
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