A tree-ring-based reconstruction of the Yimin River annual runoff in the Hulun Buir region,Inner Mongolia,for the past 135 years  

作　　者：BAO Guang LIU Yu LIU Na 

机构地区：[1]Key Laboratory of Disaster Monitoring and Mechanism Simulating of Shaanxi Province,Baoji University of Arts and Sciences,Baoji 721013,China [2]The State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China [3]Department of Environmental Science and Technology,School of Human Settlements and Civil Engineering,Xi'an Jiaotong University Xi'an 710049.China

出　　处：《Chinese Science Bulletin》2012年第36期4765-4775,共11页

基　　金：supported by the National Natural Science Foundation of China(40890051 and 41171170);the Chinese Academy of Sciences (KZCX2-YW-Q1-01 and KZZD-EW-04);the One-hundred Talents Program of the Chinese Academy of Sciences;the State Key Laboratory of Loess and Quaternary Geology Foundation(SKLLQG1102);Baoji University of Arts and Sciences(ZK11063)

摘　　要：Based on the relationships between the regional tree-ring chronology(RC) of moisture-sensitive Pinus sylvestris var.mongolica and the monthly mean maximum temperature,annual precipitation and annual runoff,a reconstruction of the runoff of the Yimin River was performed for the period 1868-2002.The model was stable and could explain 52.2% of the variance for the calibration period of 1956-2002.During the past 135 years,21 extremely dry years and 19 extremely wet years occurred.These years represented 15.6% and 14.1% of the total study period,respectively.Six severe drought events lasting two years or more occurred in 1950-1951,1986-1987,1905-1909,1926-1928,1968-1969 and 1919-1920.Four wetter events occurred during 1954-1959,1932-1934,1939-1940 and 1990-1991.Comparisons with other tree-ring-based streamflow reconstructions or chronologies for surrounding areas supplied a high degree of confidence in our reconstruction.Power spectrum and wavelet analyses suggested that the reconstructed annual runoff variation in the Hulun Buir region and surrounding area could be associated with large-scale atmospheric-oceanic variability,such as the Pacific Decadal Oscillation(PDO) and El Ni o-Southern Oscillation(ENSO),and sunspot activity.Based on the relationships between the regional tree-ring chronology （RC） of moisture-sensitive Pinus sylvestris var. mongolica and the monthly mean maximum temperature, annual precipitation and annual runoff, a reconstruction of the runoff of the Yimin River was performed for the period 1868-2002. The model was stable and could explain 52.2% of the variance for the calibration period of 1956-2002. During the past 135 years, 21 extremely dry years and 19 extremely wet years occurred. These years repre- sented 15.6% and 14.1% of the total study period, respectively. Six severe drought events lasting two years or more occurred in 1950-1951, 1986-1987, 1905-1909, 1926-1928, 1968-1969 and 1919-1920. Four wetter events occurred during 1954-1959, 1932-1934, 1939-1940 and 1990-1991. Comparisons with other tree-ring-based streamflow reconstructions or chronologies for surrounding areas supplied a high degree of confidence in our reconstruction. Power spectrum and wavelet analyses suggested that the reconstructed annual runoff variation in the Hulun Buir region and surrounding area could be associated with large-scale atmospheric-oceanic variability, such as the Pacific Decadal Oscillation （PDO） and E1 Nifio-Southern Oscillation （ENSO）, and sunspot activity.

关 键 词：呼伦贝尔地区 年径流量 伊敏河 内蒙古 基础 太平洋年代际振荡 樟子松人工林 平均最高气温 

分 类 号：P333.1[天文地球—水文科学] X322[水利工程—水文学及水资源]