Abstract:

The herbaceous is the Ulanbuh desert plant community's important component, the research herbaceous plant community characteristic and the plant species multiplicity, for knowing and protecting the plant diversity resources in desert area to provide the theory basis and the practice foundation. According to the quadrat investigation material, the author calculated typical herbaceous plant’s diversity index values in Ulanbuh desert by using the diversity computational methods of plant community characteristics. The results showed that typical herbaceous plant community species in Ulanbuh desert were few, the investigation result total of 24 species belonging 8 families, and the preponderant families were Gramineae and Chenopodiaceae; the average value of herbaceous plant’s diversity index were smaller, species diversity overall low level, ecological dominance, species diversity and evenness degree were quite different in different communities; the herbaceous plant’s diversity index presented the basic consistent change tendency. Ulanbuh desert herbaceous community type was diverse, but the community composed the structure to be simple; the dominant species and between the subdominant species importance value's disparity species quantity increased along with the community in reduces; the herbaceous plant community diversity indices were small, the herbaceous species' distribution was non-uniform, assumed the mottling distribution generally.