Archaeal 16S rRNA gene clone library was constructed according
to the method described previously (Lu et al., 2011, 2012a)
by using a pair of universal archaeal primers 787F (forward primer
50-ATTAGATACCCSBGTAGTCC-30) and 1059R (reverse primer
50-GCCATGCACCWCCTCT-30). Plasmids containing positive inserts
were sequenced using an ABI 3730XL sequencer. All producing
sequences were checked for chimeras using the CHECK_CHIMERA
program. Same bioinformatics analytical method was adopted as
mentioned above.