Infl uence of altitude and tree class on climate-growth relationships in a larch plantation in subtropical China  

作　　者：Chunyan Wu Dongsheng Chen Xiaomei Sun Shougong Zhang 

机构地区：[1]State Key Laboratory of Tree Genetics and Breeding,Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,People’s Republic of China

出　　处：《Journal of Forestry Research》2023年第6期1869-1880,共12页林业研究（英文版）

基　　金：funded by Fundamental Research Funds of CAF (CAFYBB2022ZA00103);National Natural Science Foundation of China (General Program)(31971652);National Natural Science Foundation of China (32001308);Fundamental Research Funds of CAF (CAFYBB2022ZC001)

摘　　要：Precise quantifi cation of climate-growth relationships can make a major contribution to scientifi c forest management.However,whether diff erences in the response of growth to climate at diff erent altitudes remains unclear.To answer this,264 trees of Larix kaempferi from 88 plots,representing diff erent altitudinal ranges(1000-2100 m)and tree classes were sampled and used to develop tree-ring chronologies.Tree-ring growth(TRG)was either positively(dominant)or negatively(intermediate and suppressed)correlated with climate in diff erent tree classes at diff erent altitudes.TRG was strongly correlated with growing season at low altitudes,but was less sensitive to climate at middle altitudes.It was mainly limited by precipitation and was highly sensitive to climate at low altitudes.Climate-growth relationships at high altitudes were opposite compared to those at low altitudes.TRG of dominant trees was more sensitive to climate change compared to intermediate and suppressed trees.Climate factors(annual temperatures;moisture,the number of frost-free days)had diff erent eff ects on tree-ring growth of diff erent tree classes along altitudinal gradients.It was concluded that the increase in summer temperatures decreased water availability,resulting in a signifi cant decline in growth rates after 2005 at lower altitudes.L.kaempferi is suitable for planting in middle altitudes and dominant trees were the best sampling choice for accurately assessing climate-growth relationships.

关 键 词：Tree-ring width index CHRONOLOGY Correlation coeffi cient Additive mixed models Tree classes 

分 类 号：S791.22[农业科学—林木遗传育种]