XIA Jiang-bao1,XU Jing-wei2,LI Chuan-rong3,LIU Jing-tao1,WANG Yue-hai2,LU Zhao-hua1(1.Binzhou University,Shandong Provincial Key Laboratory of Eco-environmental Science for Yellow River Delta,Binzhou,Shandong 256603,2.The Research Institute of Forestry in Shandong,Jinan,Shandong 250014,3.College of Forestry,Shandong Agriculture University,Taian,Shandong 271018)