2712007M1SActaScientiaeCircumstantiaeVol.27,No.1Jan., 2007:SE/?Z9(No.2002AA601011);SSM7v(No.KZCX1-SW-12)SupportedbytheHi-techResearchandDevelopmentProgramofChina(No.2002AA601011)andInnovationProjectofChineseAcademyofSciences(No.KZCX1-SW-12)Te:Uura.5!XVZ)5j,99,.2007.3kJ.S, 27(1):5 12Uu,.2007.3YJ.S, 27(1):18 22A,f,o,.2007.3%8?4cJ.S, 27(1):35 39f!,Be,.2007.(rTJ.S, 27(1):13 17,Uu,;.2005.v0=?dbJ.SY, 50(1):66714