Project supported by the National Natural Science Foundation of China(Nos.11247213,10664002,11264030,61368002);China Postdoctoral Science Foundation(No.2013M531558);the Natural Science Foundation of Jiangxi Province(No.20122BAB201031);the Foundation for Young Scientists of Jiangxi Province(Jinggang Star)(No.2012BCB23002);the Research Foundation of the Education Department of Jiangxi Province(Nos.GJJ12137,GJJ13051,GJJ13057);Jiangxi Postdoctoral Research Project(No.2013KY33)