2Raunkiaer C. The Life Forms of Plants and Statistieal Plant Geogr:lphy[M]. Oxford: Clarendon Press, 1934.
3Pillar V D, Duarte L D S, Sosinski E E, et al. Discriminating trait-convergence and trait-divergence assembly patterns in ecological community gradients[J]. Journal of Vegetation Science, 2009(20): 334-48.
4Branhagen A. Maintain wildflower plantings for enduring beauty[J]. Grotmds Maintenance, 1997, 9(32): 9-33: 38-42.