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青藏高原东北部柴达木盆地过去1000年以来湿度变化对于了解气候变暖背景下当地水环境变化具有重要意义.利用祁连圆柏建立了从991~2010年期间3年分辨率的树轮δ18O序列.在1800~2006年的共同时段内,新建立的树轮δδ18O与前期在天峻地区建立的年分辨率树轮δ18O序列显著相关(r=0.61,P<0.001,n=69).因此,柴达木盆地的树轮δ18O比率变化可以作为生长季相对湿度的可靠代用指标.千年树轮δ18O序列的低频变化显示出“干-湿-干”的变化型,即中世纪异常期气候偏干,小冰期气候湿润,20世纪暖期气候偏干.通过与其他重建资料的对比,发现柴达木盆地新建立树轮δ18O序列能够较好地表现过去1000年以来当地相对湿度的变化历史.
The change of the humidity over the past 1000 years in the Qaidam basin in the northeastern Qinghai-Tibet Plateau is of great significance for understanding the local water environment changes under the background of climate warming. The δ18O sequence of tree rings from three years of resolution from 1991 to 2010 was established. During the same period from 1800 to 2006, the newly established tree-ring δδ18O was significantly correlated with the δ18O sequence of annual resolution tree rings established in Tianjun area (r = 0.61, P <0.001, n = 69) The δ18O ratio of the tree-ring in the Damu Basin can be used as a reliable proxy for the relative humidity in the growing season.The low-frequency variation of the δ18O sequence of the Millennium tree shows a “dry-wet-dry” variation, ie, anomalous dry weather in the Middle Ages , Humid climate during the Little Ice Age and partial dry climate during the warm Twentieth Century.Comparing with other reconstruction data, it was found that the newly established δ18O sequence of tree rings in Qaidam Basin can better reflect the local relative humidity history over the past 1000 years.