Along the gradient away from the railway, the total size of A. splendens patch showed a decreasing trend and species richness showed an increasing trend.

• 芨芨草斑块大小在样线上所占的比例比针茅斑块为小，且有随远离铁路而减小的趋势，而物种丰富度则出现相反的变化趋势；