国家自然科学基金41371127;福建省基本科研专项重点项目2014R1034-1;福建师范大学校级创新团队项目No.IRTL1205Supported by the National Natural Science Foundation of China41371127;the Key Project of Basic Scientific Research in Fujian Province2014R1034-1;the Program for Innovative Research Team of Fujian Normal UniversityIRTL1205