国家自然科学基金资助项目,No.30960338;兵团博士基金资助项目,No.2011BB019;兵团重点领域科技攻关基金资助项目,No.2011BA058;the National Natural Science Foundation of China,No.30960338;the Doctoral Foundation of Xinjiang Production and Construction Corps,No.2011BB019;the Key Scientific and Technological Project of Xinjiang Production and Construction Corps,No.2011BA058