importance value
2.Conclusion: The elctrophysiology may be of importance value in diagnosis the imits、property、position and degree of brachial plexus injury.
3.An analysis of importance value indicated that 6 species, i.e. Ardeola bacchus,Egretta garzetta,Apus affinis,Hirundo rustica,Hirundo daurica,Pycnonotus sinensis, were the most important species.
4.Base on the dominate species of community and importance value of exotic plants,the most harmful exotic plants in Changsha were Alternanthera philoxeroide,Hyptis rhomboidea,Paspalum conjugatum and Veronica polita.
5.The results indicated that with the increase of altitude,the importance value of Scirpus mariqueter,a representative species at early succession stage,decreased gradually,while those of Spartina alterniflora and Phragmites australis increased.

