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首页> 外文期刊>Estuarine Coastal and Shelf Science >Methanogenesis: Seasonal changes in human impacted regions of Ashtamudi estuary (Kerala, South India)
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Methanogenesis: Seasonal changes in human impacted regions of Ashtamudi estuary (Kerala, South India)

机译：甲烷生成：受人类影响的Ashtamudi河口地区（印度喀拉拉邦）的季节性变化

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Environmental variables as well as methanogenic abundance and activity were analysed in selected human impacted regions of Ashtamudi estuary. Sediment samples were collected during summer and monsoon of 2013. Each was analysed for environmental variables such as temperature, pH, electrical conductivity, sulphate, total kjeldahl nitrogen, organic carbon, organic matter and redox potential. Abundance and methanogenic potential of two distinct groups of methanogenic archaea (i.e. aceticlastic and methylotrophic methanogens) were quantified by incubating the sediment samples in basal media, added with acetate or methanol as substrate. Most of the environmental variables showed significant differences spatially and temporally. Among the environmental variables, temperature, pH, electrical conductivity and salinity were higher during summer, while total kjeldahl nitrogen, sulphate and organic carbon were higher during monsoon. Abundance of both aceticlastic and methylotrophic methanogens showed significant variations both spatially and temporally. Aceticlastic methanogens were abundant during monsoon, with a maximum value of 810 +/- 13 CFU g(-1), and methylotrophic methanogens were abundant during summer, with a maximum value of 1770 +/- 30 CFU g(-1). Results of methanogenic potential of sediment samples showed a range of 0.01 +/- 0.00 to 12.03 +/- 035 mol m(-3). Among the two substrates, methanol favoured the abundance of methylotrophic methanogens, while acetate induced the methanogenic activity. Methanogenic activity was higher during monsoon than summer that can be attributed to the favourable sedimentary conditions (like reduced redox potential and increased substrate availability). Aceticlastic methanogens were abundant at bottom layers and methylotrophic methanogens in top layers of the sediments. The results of canonical correspondence analysis revealed the existence of linear relationship between methanogenic archaea and environmental variables among the sampling stations. Higher values of salinity, electrical conductivity and total kjeldahl nitrogen favoured the distribution and abundance of aceticlastic methanogens. However, the abundance of methylotrophic methanogens was favoured by highly reduced conditions and high pH values. (C) 2014 Elsevier Ltd. All rights reserved.
机译：在Ashtamudi河口的部分受人类影响的区域中，分析了环境变量以及产甲烷的丰度和活性。在2013年夏季和季风期间收集了沉积物样本。每个样本都分析了环境变量，例如温度，pH，电导率，硫酸盐，凯氏总氮，有机碳，有机质和氧化还原电势。通过将沉积物样品在基础培养基中孵育，并添加乙酸盐或甲醇作为底物，对两组不同产甲烷的古细菌（即破乳和产甲烷的产甲烷菌）的丰度和产甲烷潜力进行定量。大多数环境变量在空间和时间上显示出显着差异。在环境变量中，夏季期间温度，pH，电导率和盐度较高，而季风期间凯氏氮，硫酸盐和有机碳总量较高。破土和甲基营养型产甲烷菌的含量在空间和时间上均表现出显着变化。季风期间有大量的弹力产甲烷菌，最大值为810 +/- 13 CFU g（-1），而甲基营养型产甲烷菌则在夏季丰富，最大值为1770 +/- 30 CFU g（-1）。沉积物样品的产甲烷潜力的结果显示范围为0.01 +/- 0.00至12.03 +/- 035 mol m（-3）。在这两种底物中，甲醇有利于甲基营养型产甲烷菌，而乙酸盐则诱导产甲烷菌活性。季风期间产甲烷的活动高于夏季，这可以归因于有利的沉积条件（例如降低的氧化还原电势和增加的底物利用率）。沉积物的底层有大量的弹塑性产甲烷菌，而在沉积物的顶层有大量的甲基营养型产甲烷菌。典范对应分析的结果表明，采样站之间产甲烷古菌与环境变量之间存在线性关系。较高的盐度，电导率和凯氏定氮总量有利于回弹产甲烷菌的分布和丰度。但是，高度还原的条件和高pH值有利于甲基营养型产甲烷菌。 （C）2014 Elsevier Ltd.保留所有权利。

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