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林线位置的变化,是地质历史时期和现代诸多环境因素综合作用的结果,可用来指示全新世气候的波动．雪岭云杉(Picea schrenkiana)作为新疆天山北坡山地针叶林的建群种,其分布范围和种群大小对气候变化反应敏感．本文选取新疆吉木萨尔县泉子街乡桦树窝子村典型自然剖面和邻近的小西沟考古遗址剖面进行较高时间分辨率的孢粉分析和对比,结合地层14C年代分析和文化层炭屑扫描电镜显微结构鉴定,表明两个剖面在2000-1300 aBP同一时段的地层中均出现云杉花粉百分含量的峰值,云杉花粉分别达到20％和35％以上,并与小西沟文化层中雪岭云杉炭屑的年代相吻合,揭示出在2000-1300 aBP时段,天山北坡雪岭云杉林的林线相对现今下移约330m左右．
The change of the position of the forest line is the result of the combined effect of geological history and many modern environmental factors and can be used to indicate the fluctuation of the Holocene climate. Picea schrenkiana, a built-up species of mountain coniferous forest on the northern slope of Tianshan Mountain, Xinjiang, is sensitive to climate change due to its distribution range and population size. In this paper, we selected the sporopollen analysis and comparison of the typical time profiles of the typical natural sections of the birch Wozi Village in Quanzijie Town, Jimsar County, Xinjiang Province, and the adjacent Xiaoxigou archaeological site. Combined with the analyzes of the 14C ages and the stratigraphic carbon and charcoal scans The microstructure of the spruce showed that the spruce pollen peak appeared in the two sections at the same period from 2000 to 1300 aBP. The spruce pollen reached 20% and 35% respectively, The age of snowy spruce charcoal coincided, revealing that during the period of 2000-1300 aBP, the forest line of the snowy spruce forest on the northern slope of the Tianshan Mountains is about 330m lower than today.