【摘要】 基于采自阿巴嘎旗的沙地榆树芯建立了树轮宽度标准年表,将标准年表与气象资料进行相关分析,相关结果显示其与4-5月份降水量显著正相关,相关系数为0. 673。建立的标准年表与4-5月份降水量回归方程(R2=45. 36%)通过了可靠性检验,利用该方程得到了阿巴嘎旗1862-2012年的4-5月份降水量。重建的151a降水量序列存在2个湿润期和3个干旱期,多窗谱分析检测到该序列存在29-41a、6. 5-7a和2-3a周期。比对其他重建序列,干旱时期较为一致,历史资料记载也可证实重建序列的可靠性。更多还原

【Abstract】 Tree-ring width standard chronology was established by elm tree-ring cores that collected from Abag Banner. The correlation between tree-ring width standard chronology and climate factors from Abag Banner weather station was analyzed. Results show that there was positive correlation between the April-May precipitation and the tree-ring width standard chronology( correlation coefficient was 0. 673). The established regression equation( R2= 45. 36%) between April-May precipitation and standard chronology had passed the reliability test and we obtained an April-May precipitation reconstruction sequence during 1862-2012. There were two wet periods and three drought periods in the reconstructed April-May precipitation sequence over the past 151 years. There were significant cycles of 29-41,6. 5-7 and 2-3 years in the reconstruction sequence by using the Multi-taper method. There had high consistency on drought periods by comparing the reconstruction sequence with other reconstruction sequences. Moreover,historical data also confirmed the reliability of the April-May precipitation reconstruction sequence.更多还原