Pollen assemblage characters of human disturbed vegetation in arid area in northwestern China
Ma Yanling, Xu Qinghai, Huang Xiaozhong, Zhou Gang, Zhang Liyan, Tao Shichen, Sun Huiling
JOURNAL OF PALAEOGEOGRAPHY . 2009, (5): 542 -550 .  DOI: 10.7605/gdlxb.2009.05.008