Influence of different site preparing modes on species diversity of grassland plant communities in loess hilly area of Southern Ningxia;

This paper, based on an analysis of life form, species diversity in both zonal plant communities and some derived and old families of angiosperm, has probed into the relationship between species diversity and the phylogenetic traits of plants.

Life form is a consequence, which adapts to a specific habitat for a long time so the life form spectrum of land plant community is different because of different water and heat with different latitude, longitude and altitude.