Restoration dynamics of plant community on abandoned arable land under erosion environment

In order to understand the characteristics and dynamics of plant community on abandoned arable land on Loess Plateau,11 abandoned arable lands with different ages were studied systematically through the approach of substituting the temporal serial with spatial serial.The results showed that with the increased in the number of years of land abandonment,the plant community's coverage and above-ground biomass increased gradually.There is a positive correlation between the species diversity index and abandoned age which can accurately reflect species richness and dynamic change objectively,but correlate with community dominance negatively.The evolution tendency which rise at the beginning,then drop and also rise can reach the peak of the species diversity index after land abandonment for about 3,10 and 25 years.The stability of plant community structure has a close relation with biomass,diversity,coverage and dominance,which strengthen stepedly with the progress of restorative succession and provide a foundation for ecological restoration under erosion environment.