Abstract：Research purposes ： Artemisia ordosica is the suitable species for ecological restoration. Studying of dominant families and genera as well as growth characteristics plays an important role in loess slope stability and ecological restoration. Based on the investigation of local natural growth dominant plant artemisia ordosica on loess slope in Yan an area，though the statistics of vegetation density，growth characteristics，and Simpson index of artemisia ordosica of loess slope，the loess slope protection of artemisia ordosica is presented，which provides a reliable basis for the design of compound ecological protection to loess slope in Yan an area.
Research conclusions:(1) The vegetation species diversity is below the medium level in Yan an area，which accords
with the slope vegetation composition characteristics of loess plateau semiarid areas. (2) Artemisia ordosica is the main varieties of loess slope vegetation due to its drought and freezing tolerant. (3) The artemisia ordosica quantity decreases with the increase of gradient or the decrease of soil moisture，but the relative dominance of artemisia ordosica on loess slope increases. (4) Based on the analysis of slope protection of artemisia ordosica，the selection of vegetation type and structural design of eco - engineering for loess slope protection under different slope gradients are suggested. (5) Theresearch results can be the guidance for loess slope ecological protection technology in northwest China.
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2015, Vol. 32 
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