The work is supported by the Scientific Research Fund of Hunan Provincial Education Department under grant No. 15C0659 , 14C0542 , and National Key Technology Research Program of China under grant No. 2012BAD35B05 , 2012BAD35B07 , and Research Program of Hunan Rural Information Service Key Lab under grant No. XAI20150326 , and the Scientific Research Fund of Sichuan Provincial Education Department under grant No. 15ZA0308 .