基于树轮密度资料的黄河干流中部地区的PDSI序列重建  

Reconstruction of PDSI Sequence in Central Part of Yellow River Based on Tree Rings Density Data

作　　者：杨银科[1,2] 盛强[1] 邵鹏鲲 程佳明 YANG Yin-ke;SHENG Qiang;SHAO Peng-kun;CHENG Jia-ming(School of Water and Environment,Chang'an University,Xi'an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region,Ministry of Education,Chang'an University,Xi'an 710054,China)

机构地区：[1]长安大学水利与环境学院,陕西西安710054 [2]长安大学旱区地下水文与生态效应教育部重点实验室,陕西西安710054

出　　处：《水电能源科学》2022年第8期1-4,31,共5页Water Resources and Power

基　　金：国家自然科学青年基金项目(41102107);中国科学院黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG1933);长安大学中央高校基本科研业务费专项资金(300102291403);陕西省自然科学基础研究计划资助项目(2017JM4018,2021SF-497)。

摘　　要：为重建历史时期黄河流域长尺度气候环境因子的变化序列,利用采自黄河干流中部地区的油松(Pinus tabulaeo frmis)树轮样本开展了密度指标测试分析,构建了1888年以来的树轮密度年表序列,确定帕尔默干旱指数(PDSI)与树轮最大密度年表(MAXD_(RES))之间存在显著的正相关关系,相关系数最高可达0.605(p<0.001),进而基于MAXD_(RES)年表重建了研究区1888年以来9~12月的PDSI变化序列,拟合方程方差解释量为39.58%。结果表明,黄河干流中部地区自1888年以来秋冬季气候特征整体较为干旱,对比确定相对偏干旱时段分别为1896~1900、1919~1933、1952~1956、1992~2002年,偏湿润时段分别为1889~1895、1904~1910、1934~1951、1957~1962、1974~1980、1983~1991年;重建的PDSI_(9-12)变化序列存在23、67年左右的周期特征。In order to reconstruct the change sequence of long scale climatic and environmental factors during the historical period in Yellow River Basin,Using the tree ring samples of Pinus tabulaeo frmis collected from the central part of Yellow River,the density index was and analyzed,and the chronological sequence of tree ring density was constructed since 1888.There was a significant positive correlation between palmer drought index(PDSI)and tree ring maximum density chronology(MAXD_(RES)),and the correlation coefficient was up to 0.605(p<0.001).Based on the tree ring maximum density chronology,the sequence of PDSI changes in the study area from September to December from 1888 was reconstructed,and the amount of explanation of the variance of the fitted equation was 39.58%.The results show that the overall climate characteristics of autumn and winter in the middle part of Yellow River have been relatively arid since 1888.Through comparative analysis,it is determined that the relatively dry periods include 1896-1900,1919-1933,1952-1956 and 1992-2002,and the relatively humid periods include 1889-1895,1904-1910,1934-1951,1957-1962,1974-1980 and 1983-1991.The reconstructed PDSI_(9-12) change sequence has periodic characteristics of about 23 years and 67 years.

关 键 词：帕尔默干旱指数(PDSI) 油松 树木年轮 最大密度 黄河干流中部地区 

分 类 号：P426.616[天文地球—大气科学及气象学] TV11[水利工程—水文学及水资源]