Fluctuation of Picea timberline and paleoenvironment onthe northern slope of Tian-shan Mountains during the late Holocene

查看全文 作　　者：ZHANG [1]Yun;KONG [1]Zhaochen;YAN [2]Shun;YANG [1,3]Zhenjing;NI [1]Jian 机构地区：[1]Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;[2]Xinjiang Institute of Ecology and Geography, Chinese Academy ofSciences, ürümqqi 830011, China;[3]Institute of Hydrologic and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding 050803, China 出　　处：《Chinese Science Bulletin》索引2006年第51卷第14期,共10页 基　　金：supported by the National Natural Science Foundation of China(Grant No.90102009);the Scientific Research Foundation for the Returned 0verseas Chinese Scholars,State Education Ministry,the Innovation Project of the Chinese Academy of Sciences(Grant No.KZCXI-10-05);973 project(Grant No.G1999043502). 摘　　要：As a good indicator of Holocene climate, the fluctuation of alpine timberline is a synthetical result of impacts of many environmental factors dur-ing geological and historical periods and modern times. As the dominant tree species of mountainous conifer forests on the northern slope of Tianshan Mountains in Xinjiang, the distribution of Picea schrenkiana and its population size are sensitive to climatic change. The typical natural profile of Huashuwozi and the nearby Xiaoxigou archaeologi-cal profile, located in Quanzijie Township, Jimusaer County in Xinjiang, were chosen to analyze and compare the relative high-resolution pollen records, and to measure 14C dating and SEM (scanning elec-tron microscope) microstructure for charcoal frag-ments contained in Xiaoxigou profile’s cultural layers. The results show that in these two profiles, the high percentages of Picea (more than 20% and 35%, re-spectively) appeared in the stratum of the same pe-riod (2000-1300 a BP), which corresponds to the charcoal fragment’s age of Picea schrenkiana con-tained in Xiaoxigou cultural layers. These results convincingly revealed that during the period of 2000-1300 a BP, the timberline for Picea schrenkiana on the northern slope of Tianshan Mountains in Xinjiang declined by about 330m compared with the present. 关 键 词：云杉属 树木线 天山北坡 全新世