1. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, P.R. China;
2. National and Local Joint Engineering Laboratory for Energy Plant Bio-Oil Production and Application, Chengdu, P.R. China;
3. Key Laboratory of Bio-resources and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, P.R. China