8Obsowski B M, Klironomos J N, Dunfield K E, et al. The potential of soil amendments for restoring severely disturbed grasslands [ J ]. Applied Soil Ecology, 2012,60 : 77- 83.
9Weijtmans K, Jongejans E, Van Ruijven J. Sod cutting and soil biota effects on seedling performance[ J]. Acta Oecologi- ca,2009, 35(5) : 651-656.
10Shah G M, Shah G A, Groot J C J, et al. Irrigation and lava meal use reduce ammonia emission and improve N utilization when solid cattle manure is applied to grassland [ J ]. Agricul- ture, Ecosystems & Environment. ,2012, 160: 59-65.