Abstract

A comparative vertical profile was performed regarding methane production, methanogenic population, methane oxidation and methanotrophic population in the soil of Sundarban mangrove forest, a paddy field at Namkhana (near to Sundarban mangrove) and a paddy field at Burdwan (non-mangrove region) during pre-monsoon, monsoon and post-monsoon along with selected physicochemical parameters. Maximum methane production rate (8.70 mmol m⁻²day⁻¹) was found from the soil collected from 60 cm depth from the paddy field of Burdwan which was 1.42 and 1.79 times higher than that of Sundarban mangrove forest and paddy field of Namkhana, respectively. However maximum methane oxidation rate (3.30 mmol m⁻²day⁻¹) was found from the surface soil of Sundarban mangrove forest during monsoon season which was 1.25 and 2.70 times higher than that of paddy field of Namkhana and Burdwan, respectively. An increasing vertical trend was found for the ratio of methanogenic population to methanotrophic population and Methane production rate to methane oxidation rate for the studied stations suggested dominance of methanogens in the deeper soil. Both those two ratios were maximum for paddy field of Burdwan suggested maximum methane flux from this station than other two stations due to presence of a smaller number of methanotrophic bacteria. All three stations showed significant correlation between methane production with methanogenic population and methane oxidation with methanotrophic population throughout the year suggested major microbial contribution in the net flux of methane from the soil.

抽象的

进行了比较的垂直剖面，分析了桑达尔班红树林森林，Namkhana（桑达尔班红树林附近）的稻田和伯德旺（非红树林地区）的稻田中甲烷的产生，甲烷生成种群，甲烷氧化和甲烷营养种群。季风前，季风和季风后以及选定的理化参数。从Burdwan稻田60厘米深处采集的土壤中发现最大甲烷产量（8.70 mmol m ^-2天^-1），分别比Sundarban红树林和Namkhana稻田高1.42倍和1.79倍。但是，最大甲烷氧化速率（3.30 mmol m ^-2天^-1季风季节从桑达尔班红树林的表层土壤中发现），分别是纳姆卡纳和布尔德旺稻田的1.25和2.70倍。研究站点发现甲烷化种群与甲烷营养种群的比率以及甲烷产生速率与甲烷氧化速率的垂直趋势呈上升趋势，表明深层土壤中甲烷菌的优势地位。这两个比率都对Burdwan的稻田而言最大，这表明该站比其他两个站产生的甲烷通量最大，原因是甲烷养养细菌的数量较少。