河谷澜沧黄杉指示的青藏高原东南地区过去205年干湿变化  

Changes of wet and dry climate in the past 205 years indicated by Pseudotsuga forrestii of river valley from southeastern Tibetan Plateau,China

作　　者：赵晓恩 岳伟鹏 高志鸿 陈峰 ZHAO Xiao-en;YUE Wei-peng;GAO Zhi-hong;CHEN Feng(Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security,Institute of International Rivers and Eco Security,Yunnan University,Kunming 650504,China;Key Laboratory of Tree-ring Physical and Chemical Research of the Chinese Meteorological Administration/Xinjiang Laboratory of Tree-ring Ecology,Institute of Desert Meteorology,Chinese Meteorological Administration,Urumqi 830002,China)

机构地区：[1]云南大学,国际河流与生态安全研究院国际河流与跨境生态安全重点实验室,昆明650504 [2]中国气象局乌鲁木齐沙漠气象研究所,树木年轮理化研究重点开放实验室/新疆树木年轮生态实验室,乌鲁木齐830002

出　　处：《应用生态学报》2021年第10期3643-3652,共10页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(32061123008)资助。

摘　　要：利用采集自青藏高原东南地区察隅县低海拔河谷澜沧黄杉建立树轮宽度差值年表。将树轮宽度差值年表与气候因子进行皮尔逊相关分析,利用线性回归方法重建了青藏高原东南地区1812—2016年4—5月帕尔默干旱指数(PDSI)变化(方差解释量为47%)。结果表明:树轮宽度指数与PDSI指数有良好相关性(r=0.69,P<0.01)。PDSI重建序列存在4个偏湿阶段(1831—1844年、1853—1863年、1938—1948年和1988—2002年)、3个偏干阶段(1864—1876年、1908—1926年和2003—2016年)。与其他序列和历史记录对比分析表明,该重建序列能够较好地指示研究区历史时期干湿变化。空间分析显示,重建序列与青藏高原东南地区PDSI指数的变化趋势较为一致,具有很强的空间代表性。多窗谱分析表明,PDSI重建序列具有19~20、3.9、3.2、2.4和2.1年准周期变化特征,这些周期性干湿变化与亚洲夏季风和ENSO活动相关。The residual chronology of tree-ring width was constructed using Pseudotsuga forrestii collected from the low-altitude valley in the Chayu County,southeastern Tibetan Plateau of China.Pearson correlation analysis was carried out between the residual chronology of tree-ring width and climatic factors.The changes of Palmer drought severity index(PDSI)from April to May between 1812 and 2016 in the southeastern Tibetan Plateau were reconstructed by linear regression method(the variance interpretation was 47%).There was a significantly positive correlation between the PDSI index and tree-ring width index(r=0.69,P<0.01).The PDSI reconstructed sequence had four wet periods(1831-1844,1853-1863,1938-1948 and 1988-2002)and three dry periods(1864-1876,1908-1926 and 2003-2016).Compared with other reconstructed sequences and historical records,our reconstructed sequence could better express dry and wet changes in the study area.The spatial analysis showed that the reconstructed sequence was consistent with the variation trend of PDSI index in southeastern Tibetan Plateau,with a strong spatial representation.Multiple tapers spectral analysis demonstrated that the PDSI reconstructed sequence had remarkable 19-20,3.9,3.2,2.4 and 2.1 years quasi-periodic changes for the past 205 years,probably related to Asian summer monsoon and ENSO activities.

关 键 词：青藏高原 澜沧黄杉 树轮宽度 

分 类 号：P467[天文地球—大气科学及气象学]