| [effects of artificial ulmus pumila forest on plant diversity of temperate grassland in inner mongolia]. | based on field survey, the effects of artificial ulmus pumila forest on the species diversity of temperate grassland in siziwang banner of inner mongolia were studied. the results showed that u. pumila forest had obvious effects on the species diversity of grassland. with increasing density of u. pumila, the patrick's richness, pielou's evenness and shannon-wiener index of grass species under the forest had a decreasing trend, and were higher nearby the forest than far from the forest. the habit ... | 2008 | 18808008 |