Effects of Waste Crumb Rubber Filled in Turf Medium on Biological Characteristics of Lolium perenne L. before and after Trample Stress Effects of Waste Crumb Rubber Filled in Turf Medium on Biological Characteristics of Lolium perenne L. before and after Trample Stress Characteristic substances and photosynthetic characteristics of Lolium perenne L. with waste crumb rubber filled in turf medium under trample stress Effects of various trampling stresses on turf characteristics and the natural recovery of Zoysia metrella Effects of clonal integration on growth of invasive plant Alternanthera philoxeroides under two kinds of trampling stress