国家自然科学基金21336002,21222606,21376096;广东省自然科学基金S2013020013049;中央高校基本科研业务费专项资金2015PT002,2015ZP009;制浆造纸工程国家重点实验室2015C04;华南理工大学博士研究生短期境外访学项目.This work was supported by the National Natural Science Foundation of China21336002,21222606,21376096;the Key Program of Guangdong Natural Science FoundationS2013020013049;the Fundamental Research Funds for the Chinese Universities2015PT002,2015ZP009;the Pro-gram of State Key Laboratory of Pulp and Paper Engineering2015C04;the South China University of Technology Doctoral Student Short-Term Overseas Visiting Study Funding Project