Eukaryotic OTU taxonomic annotations and abundance statistics of six typical terrestrial ecosystems of China

Eukaryotic OTU taxonomic annotations and abundance statistics of topsoil (0-20 cm) of six typical terrestrial ecosystems of China which are located on the east and west sides of Hu-Line were the areas of our scientific focus: i) the karst area of southwestern China (KS), ii) the agro–pastoral ecotone of southwestern China (AS), iii) the Qinghai-Tibet Plateau (QT), iv) the Loess Plateau (LP), v) the forest–grassland ecotone (FG), and vi) the deserts of Hexi Corridors (HC), all account for an total area of approximately 2.61×10⁶ km².