10.1371/journal.pone.0106714.g001 Huhe Huhe Shinchilelt Borjigin Shinchilelt Borjigin Yunxiang Cheng Yunxiang Cheng Nobukiko Nomura Nobukiko Nomura Toshiaki Nakajima Toshiaki Nakajima Toru Nakamura Toru Nakamura Hiroo Uchiyama Hiroo Uchiyama Map of the study area and the 4 study sites (•) in Hulun Buir. Public Library of Science 2014 cropland steppe grasslands steppe grasslands face desertification pcr bacteria Inner Mongolia Denaturing gradient gel electrophoresis 16 S rRNA genes nifH gene community structure 25 years 2014-09-30 03:00:48 Figure https://plos.figshare.com/articles/figure/_Map_of_the_study_area_and_the_4_study_sites_8226_in_Hulun_Buir_/1187379 <p>Map of the study area and the 4 study sites (•) in Hulun Buir.</p>