Composition and plant species diversity of plant community in theprocess of natural restoration of desert steppe

Abstract: The plant composition and species diversity for desert steppes were identified and calculated to determine the effect of enclosure to desert steppe by field survey in the 3 years, 4 years, 5 years, 6 years and 7 years enclosure plots. This study showed that the enclosure changed the composition of plant community, indicating that the perennial species, especially some zone species such as Stipa breviliora, increased with the increase of enclosing time. The ShannonWiener indicator, Pielou indicator and Simpson indicator in the enclosure plots were higher than that in the noenclosure plots, peaking at the enclosure communities with 5 years.