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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >First record of the Recent-subRecent diatomaceous earth from the Gangetic alluvial floodplains of South 24 Parganas, West Bengal, India
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First record of the Recent-subRecent diatomaceous earth from the Gangetic alluvial floodplains of South 24 Parganas, West Bengal, India

机译：印度西孟加拉邦South 24 Parganas恒河冲积平原近新近硅藻土的第一记录

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摘要

Recent-subRecent freshwater diatomaceous earth from the Gangetic alluvial plains, West Bengal, has been reported. Under a suitable biogeochemical niche the photosynthesizing diatoms of freshwater habitat form multilevel biomats within the surficial clay-silt layers that mark a major post-flood microbial proliferation event. High rate of reproductive turnover of diatom biomass is favoured by the supply of vegetative nutriaents, monsoonal water and sunlight selectively in moist geomorphic depressions, the earlier relict patches of low-lying floodplains of the Hoogly river. Regional geoenvironmental (moist clay-silt in freshwater setting) and geomorphological (depressed relict floodplains) attributes favour far more extensive occurrence of freshwater diatomaceous earth in the Gangetic delta plains than what is reported here and thus enhances its economic viability.
机译：据报道，来自西孟加拉邦恒河冲积平原的近近期淡水硅藻土。在合适的生物地球化学生态位下，淡水生境的光合作用硅藻在表层粘土-淤泥层内形成了多层生物垫，标志着洪水后主要的微生物增殖事件。硅藻生物量的高繁殖率受到营养性营养素，季风水和阳光在潮湿的地貌洼地（霍格利河低洼洪泛区的较早遗留斑块）中的选择性供应的支持。地缘环境（淡水环境中的粘土淤泥）和地貌（低沉的遗迹洪泛区）属性比本文所报道的更有利于恒河三角洲平原中淡水硅藻土的广泛存在，从而增强了其经济可行性。

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