摘要
通过两组油松树轮宽度的研究,建立了陕西黄龙地区过去近200a来的树轮STD、RES、ARS年表,树轮宽度在20世纪20年代有过明显的下降,1929年前后达到年轮宽度最低值,与历史记载的自民国11年以来连续干旱时期相吻合(1922—1932年)。经过相关函数、响应函数分析,发现树轮宽度与生长季当年2—3月降水显著正相关,在此基础上设计了转换方程,重建了过去200年来黄龙地区早春2—3月降水历史,重建序列的解释方差为44.3%(F=16.298,p<0.001)。功率谱分析检测到2—3月降水存在7.69、6.90、6.06、5.13、5.00、4.88、4.65、2.02、2.00年的周期。
The investigation of the distribution of natural conifer has been conducted in Huanglong County, Shaanxi Province, which is located in the southeast of Loess plateau. Based on the tree-ring width analysis of two groups of Pinus tabulaeoformis, we built tree-ring chronology for the past 200 years in Huanglong region. The analysis shows that tree-ring width declined abruptly during 1920's, with the lowest in 1929 , coincident with the historical drought period of 1922—1932. Respond function analysis shows that tree-ring widths positively correlate with February-March precipitation, indicating that February-March precipitation played a great role in the tree-ring width growth. Transfer function was designed on this base to reconstruct February-March precipitation history for the past 200 years. The explained variance is 44.3%(F=16.298,p<0.001). There are three stages of precipitation changes in the reconstruction: precipitation sharply declined from 1810 to 1850 , and kept at a low level from 1850 to 1930 , with the lowest in 1929. The precipitation has been rising since 1930 . Power spectrum analysis shows there exist periods of 7.69,6.90,6.06,5.13,5.00,4.88,4.65,2.02 and 2.00 years in February-March precipitation, responding to ENSO and “QBO” events respectively. So we can say that the changes of tree-ring width in Huanglong region reflect not only the regional but also global climatic information.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2005年第2期133-139,共7页
Marine Geology & Quaternary Geology
基金
国家自然科学基金项目(90211018
40121303)
中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG0214)
