Why lowland riparian trees are difficult to use for streamflow reconstruction  

作　　者：Xiaomei Peng Shengchun Xiao Bao Yang Quanyan Tian Vladimir V.Shishov 

机构地区：[1]Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,People's Republic of China [2]School of Geography and Ocean Science,Nanjing University,Nanjing 210023,People's Republic of China [3]Institute of Fundamental Biology and Biotechnology,Siberian Federal University,Krasnoyarsk,Russia 660041

出　　处：《Journal of Forestry Research》2024年第3期219-230,共12页林业研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC) (No.42171167,41701050,42261134537);Key Laboratory Cooperative Research Project of CAS (Chinese Academy of Sciences);Inner Mongolia Autonomous Region Special Fund project for Transformation of Scientific and Technological Achievements (2021CG0046);the Alxa League Science and Technology Project (AMYY 2021-19);supported by the Ministry of Science and Higher Education of the Russian Federation (FSRZ-2023-0007).

摘　　要：Existing streamflow reconstructions based on tree-ring analysis mostly rely on species from upland,mainly montane areas,while lowland species(generally plain)areas are rarely used.This limits the understanding of streamflow change history in the lowlands,which is an important basis for water resource management.This study focused on Populus euphratica stands located along the main stream,eastern and western tributaries in the lower reaches of the Heihe River basin(HRb),in arid northwestern China.We investigated how streamflow regulation interferes with ripar-ian trees in lowlands when they used for streamflow recon-struction.Tree-ring width chronologies were developed and analyzed in conjunction with meteorological and hydrologic observation data.The results show streamflow regulation leads in sharp fluctuations in the streamflow allocation between the eastern tributaries and western tributaries.This resulted in instability of the correlation between streamflow at the two tributaries and at the Zhengyixia hydrologic station,with corresponding fluctuations in radial growth of poplar trees on the banks of the two tributaries and at the station.Streamflow regulation altered the natural patterns of seasonal streamflow below the station,changing the time window of poplar response.This study provides useful insight into tree-ring width based streamflow reconstruction in the lowlands.

关 键 词：Tree-ring width-Dendrochronology Populus euphratica The Ejina Oasis Streamflow 

分 类 号：S718.5[农业科学—林学]