开都河流域天山桦树轮宽度年表的建立及其气候响应

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 开都河流域天山桦树轮宽度年表的建立及其气候响应 DOI: 10.5846/stxb201306111650 作者: 作者单位: 中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所 作者简介: 通讯作者: 中图分类号: P935.1 基金项目: 中央级公益性科研院所基本科研业务费项目(IDM201204);国家科技支撑计划项目(2012BAC23B00);国家重点基础研究发展计划(2013CB955900)和科技部公益性行业(气象)科研专项(GYHY201206014)共同资助 Development of the tree-ring width chronology of Betula tianschanica for the Kaiduhe River watershed and its climate response Author: Affiliation: Institute of Desert Meteorology,,,,,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:利用开都河流域中段采集的天山桦树芯样本,建立了这一采样点的树轮宽度年表。该年表的特征参数与其他地区已有的桦木树轮宽度年表相近,且能较好地反映研究区内天山桦树轮宽度变化的基本特征。该年表与研究区内雪岭云杉树轮宽度年表间的相关分析表明,两者在全频域、高频域及低频域上均存在显著正相关。树木生长气候响应分析结果显示,天山桦树轮宽度与降水量的相关则不显著;而与上年12月呈显著正相关(r= 0.346,P < 0.01,n=59),与当年6月的平均气温呈显著负相关(r=-0.312,P < 0.01,n=60)。该年表存在2.1、4.0a和~50a变化准周期,并且其与3月多元El Nio-Southern Oscillation (ENSO)指数存在相似的变化趋势。 Abstract:In this study, a total of 40 cores from 20 birch trees (Betula tianschanica) were obtained for one single site, named as Haerhatigou (HEX) in the middle section of the Kaiduhe River watershed in August 2011. All the tree-ring cores were naturally dried, mounted, surfaced, and cross-dated following standard dendrochronological procedures. Each ring-width was measured with a resolution of 0.001 mm by a dendrometer (Velmex Measuring System). The quality control of the cross-dating was carried out using the COFECHA program. Because of the low correlations with the master dating series, 5 cores from 3 trees were rejected. In the end, 35 cores from 18 trees were used for further analyses. The number of the absent rings is 78, and the rate of the absent rings in the samples is 2.325%. The ARSTAN program was used for de-trending and developing tree-ring chronologies. The age- and size- related variation of the tree-ring widths was removed by a single detrending process applied on each tree-ring measurement: a negative exponential curve, a kind of conservative function. After all these processes, three kinds of chronologies from one sample site were obtained: standard chronology (STD), residual chronology (RES), and Arstan chronology (ARS). The statistical characteristics of the HEX chronology are similar to other birch chronologies' in the previous studies. And the chronology can well represent the variety of the radial growth of birch trees in the study area. The significant positive correlations in the original, high-, and low- frequency domain between the HEX chronology and a chronology of spruce trees (HE4) mean that the dominant climatic factors of two kinds of trees are similar. Pearson correlation analysis was applied to investigate the relationship between the tree-ring width and the climatic data during the calibrated period (1952-2011). The monthly precipitation and mean temperature from the previous August to the current September and the average meteorological data in summer were used to assess how the climatic elements influence the growth of birch trees in the study area. The results of the tree growth-climate responses show that the HEX chronology was found to be positively correlated with the mean temperature of the previous December (r = 0.346, P < 0.01, n=59), and to be negatively correlated with the mean temperature of the current June (r = -0.312, P < 0.01, n=60). Conversely, the relationships between the HEX chronology and the precipitation are not so strong. The results of the power spectral analysis showed that the HEX chronology existed 2.1years and 4.0years cycles. The interannual cycles (2.1years and 4.0years) in our chronology fall within the range of some large-scale oscillation, such as quasi-biennial oscillation (QBO) and El Nio-Southern Oscillation (ENSO). The wavelet analysis demonstrated the existence of significant ~50years cycles of variability. The ~50years cycle suggests a possible important connection of the solar activity cycle (Gleissberg). The 50years cycle has been indicated by some previous studies in Changbai Mountains, Tianmushan Mountains, Huangshan Mountains, and the Changting region in Fujian Province. The similar trend between the chronology and the March Multivariate ENSO Index suggests that the variation of the HEX chronology has strong teleconnections with the oscillations of land-atmospheric-ocean circulation systems. 参考文献 相似文献 引证文献