Funding for this research was provided by:
the Basic Research Project of Guizhou province (Qian Sci. Co. Basic [2017]1123)
the Science and Technology Cooperation Project of Guizhou province (Qian Sci. Co. LH [2016]7215)
the Doctoral Research Project in 2014 of Guizhou Normal University
the Key Project of Science and Technology Foundation, Guizhou Province (Qian Sci. Co. JZ, [2014], No. 2012)
Article History
Received: 30 May 2018
Accepted: 1 October 2018
First Online: 9 October 2018