The spatial distribution of bacterial communities inhabiting sediment is heterogeneous at different spatial scales, but mostly unexplored. Here, it is postulated that the heterogeneity of the bacterial community composition varies at the same scale of the heterogeneity of sediment chemical properties. The large spatial scale (km) diversity in sediment from a brackish water lagoon (Chilika Lake, India) is studied, considering the large scale physical and chemical characteristics of land cover, climate, pH, and salinity. Seventy-two samples (24 stations, 3 seasons: winter, rainy, and summer) of sediment from Chilika Lake were analyzed by 16S ribosomal ribonucleic acid (rRNA) gene sequencing, and the relations with land cover and other physico-chemical parameters are discussed. More samples were collected after a severe cyclonic storm (Phailin) passed near the lagoon in 2013, to see the impact of the tropical storm on the spatial and temporal distribution of bacteria in the sediment. The results demonstrate clear spatial relations between physico-chemical parameters (e.g., salinity), land surfaces (e.g., drainage area), and the distribution of sediment microbial communities.

居住在沉积物中的细菌群落的空间分布在不同的空间尺度上是异质的，但大多数尚未被探索。在此，假定细菌群落组成的异质性在沉积物化学性质异质性的相同规模上变化。考虑到土地覆盖物的大规模物理和化学特征，气候，pH和盐度，研究了咸水泻湖（印度Chilika湖）中沉积物的大空间尺度（km）多样性。利用16S核糖体核糖核酸（rRNA）基因序列分析了Chilika湖的72个样本（24个站点，冬季，雨季和夏季三个季节），并讨论了其与土地覆盖率和其他理化参数的关系。 。2013年，在泻湖附近发生严重的飓风风暴（Phailin）后，收集了更多样本，以观察热带风暴对沉积物中细菌的时空分布的影响。结果表明，理化参数（例如盐度），陆地表面（例如流域）和沉积物微生物群落的分布之间存在明确的空间关系。