In order to study the characteristics of soil seed banks and the features of vegetation restoration in different geologic hazard areas after Wenchuan Earthquake

species composition

density and the relationship between soil seed bank and the above ground vegetation were analyzed.Field surveys backed with seed gerurination experiments in the local natural environment were conducted in five different types of disaster(inchiding landslides

avalanches

debris flow

rock fall and barrier lakes) in Beichuan County of Sichuan Province.The results showed that the soil seed bank's density was 30133.33±6776.03~93383.33±26499.81 seed/m2

and the variance analysis indicated that only the soil seed bank density of rock fall was significantly different from other damage types.The density distribution of seeds between 0-5 cm and 5-10 cm soil layer showed no obvious hierarchical distinction.The proportion of annual or perennial herbaceous was 90.48%

the shrub was 9.52%and no tree was observed. Sorensen indices of species composition betweensoil seed banks were high

between 0.529-0.714.Meanwhile

they were not high between soil seed banks and the above ground vegetation

which were between 0.167-0.292.The average number of species between soil seed bank and the above ground vegetation were not correlated either.It was recommended that vegetation restoration should be left mainly to natural recovery.If only a few simple soil and water conservation measures are taken

it will promote seed germination and vegetation update.Due to lack of tree species in the seed bank

artificial input of arbor seed fall is needed when the rapid introduction of trees is considered.