TY - GEOGRAPHICAL RESEARCH A1 - XU Qing-hai, LI Yue-cong, YANG Xiao-lan, ZHENG Zhen-hua T1 - Study on surface pollen of major steppe communities in northern China Y1 - 2005-06-15 00:00:00.0 JF - GEOGRAPHICAL RESEARCH JO - GEOGRAPHICAL RESEARCH SP - 394 EP - 402 VL - 24 IS - 3 UR - {https://www.dlyj.ac.cn/EN/10.11821/yj2005030008} N1 - 10.11821/yj2005030008 ER -