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祁连山中部青海云杉上下限树轮宽度年表对气候的响应差异

ISSN号：1003-7578
期刊名称：干旱区资源与环境
时间：2014
页码：29-34
分类：P467[天文地球—大气科学及气象学]
作者机构：[1]兰州大学西部环境与气候变化研究院,兰州730000
相关基金：国家自然科学基金项目（NO：41171039）; 国家自然科学基金委＂创新群体＂项目第三期（NO：41021091）; 高等学校学科创新引智计划（NO：B06026）资助
相关项目：不同树种树木径向生长对气候响应机制的研究

关键词：青海云杉, 树木年轮, 响应差异, 上下限, Picea crassifolia, tree -ring chronology, response relationship

中文摘要：

通过建立和比较祁连山中部青海云杉（Picea crassifolia）生长上限和下限的树轮宽度指数年表,发现青海云杉年表的平均敏感度（M.S.）、样本量的总体解释信号（EPS）、第一主分量（PCA1）、和标准差（S.D.）以及信噪比（SNR）都表现出上限小于下限的规律。相关分析结果表明在森林下限,青海云杉的生长主要受降水的限制,而上限处青海云杉生长的限制因素不明确,并不是单一的降水或温度;通过对上下限年表做窗口为31年的逐年滑动相关后发现,青海云杉下限年表之间的相关性比较稳定;而上限年表之间的相关性有显著差异,这可能是由于随时间变化上限年表所包含气候信号不同所致。

英文摘要：

Based on the cores of Qinghai spruce （ Picea crassifolia） from upper and lower limit of tree growth in middle region of Qilian Mountains, we developed the tree -ring width index standard chronologies. The results showed that characteristics of chronology had more climatic information, and tree - ring width of lower limit was significantly and positively correlated with the precipitation in last year. There was no remarkable consistency between treering width curve of upper limit and the mean temperature or precipitation in weather data recorded during 1960 -2008. According to the reconstructed precipitation series and the 31 -year sliding correlation, theresults show that the correlation coefficients of standard chronologies at lower limit maintained at a relatively sta- ble level, and that of upper was consistent with the precipitation changes on low - frequency. So the different climatice response of upper and lower elevation limits of Picea crassifolia growth may be primely caused by the upper chronologies containing different climate signal.