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[degradation process and plant diversity of alfalfa grassland in north loess plateau of china].vegetation recovery and reconstruction is the key of ecosystem restoration in the north loess plateau. with the liudaogou catchment of shenmu county, shaanxi province as test area, this paper studied the dynamics of the plant diversity of artificial alfalfa (medicago sativa) grassland during its degradation process. the results showed that the degradation process of the grassland could be divided into three stages, i.e., artificial alfalfa grassland stage (1-6 yrs), transitional stage from artif ...200516515180
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