Dynamic population changes of Achnatherum inebrians seedlings

In order to study the effects of altitude and slope aspect on seedling numbers and the dynamic population changes of Achnatherum inebrians, the numbers of A.inebrians seedlings were analyzed under different habitat conditions (shady slopes, sunny slopes, gully bottom) at different times. The results showed that slope aspect had a significant impact (P0.05) on A.inebrians seedlings as there were significant more A.inebrians seedlings in shady slopes than that in sunny slopes. The number of A.inebrians seedling in shady slopes decreased with the increase of altitude, however, the number of that in sunny slopes did not change with altitude. The less number of A.inebrians seedling with the extension of growth time suggested that germinated seedlings died. The mortality rate was as high as 100% in middle section of sunny slope, was 47.2% in the upper section of shady slope and was between 22% and 29% in the rest of slope.