6Hodgson J. Grazing management: science into practice [M]. New York: Longman Science and Technical Press, 1990.
7Kohler F. Influence of grazing, dunging and trampling on short-term dynamics of grasslands in mountain wooded pasture[D]. Ph. D Thesis, University of Neuchatel, Neuchatel, 2004.
8Kohler F, Gillet F, Gobat J M, Buttler A. Seasonal vegetation changes in mountain pastures due to simulated effects of cattle grazing [J]. Journal of Vegetable Science, 2004, 15: 143-150.
9Betteridge K, Mackay A D, Stepberd T G, et al. Effect of cattle and sheep treading on surface configuration of a sedimentary hill soil [J]. Australian Journal of Soil Research, 1999, 37(4): 743-760.
10Bates, G. H. The vegetation of footpaths, sidewalks, carttracks and gateways[J]. Journal of Ecology. 1935. 23:470- 487.