基金国家自然科学基金项目(50747026)广西科学基金项目(0728027)+5 种基金广西研究生教育创新计划资助项目(GXU11T32516GXU11T32598)Project Supported by National Natural Science Foundation of China(50747026)Guangxi Natural Science Foundation(0728027)Innovation Project of Guangxi Graduate Education(GXU11T32516GXU11T32598)