额尔齐斯河上游西伯利亚云杉树轮宽度年表特征分析及其对气候的响应  

Analyses of Tree-Ring Width Chronologies of Picea obovata Ledeb in the Upper Stream Section of the Irtysh River and Tree-Growth Response to Climate

作　　者：姜盛夏 袁玉江[2] 喻树龙[2] 张同文[2] 陈峰[2] 尚华明[2] 张瑞波[2] 崔宇[1,2] 

机构地区：[1]新疆大学资源与环境科学学院,新疆乌鲁木齐830046 [2]中国气象局乌鲁木齐沙漠气象研究所,中国气象局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,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2015年第2期16-23,共8页Desert and Oasis Meteorology

基　　金：国家自然科学基金(41275120);国家自然科学基金(40975056);科技部气象行业专项(GYHY201206014);科技支撑项目(2012BAC23B01);国家重点基础研究发展计划项目(2010CB951001);自治区重点实验室开放课题基金项目(XJDX0909-2012-04)共同资助

摘　　要：利用采自阿尔泰山南坡额尔齐斯河上游森林6个采样点的低海拔西伯利亚云杉(Picea obovata Ledeb)树轮样本,建立6个树轮宽度指数年表。分析标准化树轮宽度年表的特征参数及对气候的响应发现:(1)可可托海北(KKT)年表包含的气候信息最多,其次是塔里德萨依(TLD)年表。(2)区域年表(HEC)与富蕴气象站上年7月到当年6月降水量相关最高达0.755,该研究结果与新疆天山山区云杉对气候的响应完全一致。降水是森林下限西伯利亚云杉树轮宽度生长的主要限制因子。(3)海拔相对较高的协特克阔依汗(XTK)和KKT年表除与其它年表具有对降水相同的响应特点外,还与当年8月的平均最低气温呈显著正相关。(4)区域年表树轮宽度指数过去292 a来经历了9个偏高时段和8个偏低时段,揭示了该地区降水的长期变化。The study area is located in the mountainous area of the upper stream section of the Irtysh River on the south slope of Altai Mountains. Following standard dendrochronological procedures, six tree-ring width chronologies were developed from Picea obovata Ledeb trees at the lower elevation ranging from 1 130 m to 1 700 m. The results show that the KKT chronology may contain most climatic signals among six chronologies. And the amount of climatic signals of TLD chronology is the second. The correlations between six tree-ring width chronologies and the precipitation of per-growth season and growth season are positive. After testing different combinations of months, higher correlation coefficients between tree-ring width indices and precipitation were found for the period from July the previous year to June of the current year （r= 0.755 ）. Our results showing the influence of precipitation on tree-ring growth in the study area are similar to those of dendroclimatie studies in the Tien Shah Mountains. The precipitation during July-June is a consistently dominant climatic factor accounting for the interannual variation of tree- ring width in the study area. The correlation coefficient between the XTK and KKT chronology is highr. And the two chronologies in the relative high elevation are not only positively with precipitation, but also with the August mean minimum temperature. During the past 292 years, the regional chronology had 9 high periods and 8 low periods, indicating long term variation of precipitation in this region.

关 键 词：额尔齐斯河上游 西伯利亚云杉 年表特征 气候响应 

分 类 号：P468[天文地球—大气科学及气象学]