国家自然科学基金81360396;广西自然科学基金项目2015GXNSFAA139204;2017广西研究生教育创新计划项目YCSW2017108.The National Natural Science Foundation of China81360396;The Natural Science Foundation of Guangxi Zhuang Autonomous Region , China2015GXNSFAA139204;The Innovation Project of Guangxi Zhuang Autonomous Regional Graduate Education , ChinaYCSW2017108