基金supported by National Science & Technology Pillar Program (2007BAD75B05 and 2007BAD75B07)Guangxi Science Foundation(0907016 and 0991080)Guangxi Academy of Sciences (0701 and 09YJ17SW07)
基金supported by Guangxi Academy of Sciences(08YJ6SW06)Guangxi Science Foundation(0907016,0991013,0991006Z,1004606,1103111,2010GXNSFF013003 and 2010GXNSFA013046)
基金This study was partly supported by National Science and Technology Platform Construction(2008FU115XB)Guangxi Science Foundation(0907016 and 0991080)Guangxi Academy of Sciences(09YJ17SW07)