[Wu Yi-qiang;Liu Yuan;Peng Wanxi] Cent S Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.^[Wu Yi-qiang;Kazuo, Hayashi;Masatoshi, Sugimori] Ehime Univ, Fac Agr, Matsuyama, Ehime 7908566, Japan.^[Cai Yingchun] NE Forestry Univ, Coll Mat Sci & Engn, Harbin 150040, Peoples R China.