16S rRNA gene amplicon sequencing of aquifer sediments from Van Phuc, Hanoi, incubated in microcosms experiment: Amended with organic matter extracted from clay sediments, 10 dayss
1 g of sediments from 30 m depth (oxidized, orange sandy sediments) with 5 mL sterile synthetic groundwater medium, modified from Rathi et al. (2017) in 20 mL headspace vials. Incubated at 28C and DNA extraction was performed following Lueders et al. (2004).