Radial growth in Qinghai spruce is most sensitive to severe drought in the Qilian Mountains of Northwest China  

作　　者：Xuge Wang Liang Jiao Ruhong Xue Peng Zhang Dashi Du Mengyuan Wei Qian Li 

机构地区：[1]College of Geography and Environmental Science,Northwest Normal University,No.967,Anning East Road,Lanzhou 730070,People's Republic of China [2]Key Laboratory of Resource Environment and Sustainable Development of Oasis,Northwest Normal University,Lanzhou 730070,Gansu Province,People's Republicof China

出　　处：《Journal of Forestry Research》2024年第3期73-86,共14页林业研究（英文版）

基　　金：supported by Natural Science Foundation of Gansu (No.21JR7RA111);CAS Light of West China Program (2020XBZG-XBQNXZ-A);the 2022 Major scientific Research Project Cultivation Plan of Northwest Normal University (WNU-LKZD2022-04).

摘　　要：Global warming and frequent extreme drought events lead to tree death and extensive forest decline,but the underlying mechanism is not clear.In drought years,cambial development is more sensitive to climate change,but in different phenological stages,the response rela-tionship is nonlinear.Therefore,the dynamic relationship between tree radial growth and climatic/environmental fac-tors needs to be studied.We thus continuously monitored radial growth of Qinghai spruce(Picea crassifolia Kom.)and environmental factors from January 2021 to November 2022 using point dendrometers and portable meteorological weather stations in the central area of the Qilian Mountains.The relationship and stability between the radial growth of Qinghai spruce and environmental factors were compared for different levels of drought in 2021 and 2022.The year 2022 had higher temperatures and less precipitation and was drier than 2021.Compared with 2021,the growing period in 2022 for Qinghai spruce was 10 days shorter,maximum growth rate(Grmax)was 4.5μm·d^(-1) slower,and the initiation of growth was 6 days later.Growth of Qinghai spruce was always restricted by drought,and the stem radial increment(SRI)was more sensitive to precipitation and air relative humidity.Seasonal changes in cumulative radial growth were divided into four phenological stages according to the time of growth onset,cessation,and maximum growth rate(Grmax)of Qinghai spruce.Stability responses of SRI to climate change were stronger in Stage 3 and Stage 4 of 2021 and stronger in Stage 1(initiation growth stage)and Stage 3 of 2022.The results provide important information on the growth of the trees in response to drought and for specific managing forests as the climate warms.

关 键 词：Picea crassifolia Radial growth dynamics Severe drought Response stability Point dendrometer 

分 类 号：S791.18[农业科学—林木遗传育种]