Modern pollen assemblages of the forest communities and their relationships with vegetation and climate in northern China
LI Yuecong, XU Qinghai, ZHANG Liyan, WANG Xueli, CAO Xianyong,YANG Xiaolan
Journal of Geographical Sciences . 2009, (6): 643 -659 .  DOI: 10.1007/s11442-009-0643-6