Changes of growth-climate relationships of Smith fir forests along an altitudinal gradient  

作　　者：Jiacheng Zheng Jing Yang Hengfeng Jia Lixin Lyu Jiayang Langzhen Qi-Bin Zhang 

机构地区：[1]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,People’s Republic of China [2]University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China [3]Linzhou Bureau of Meteorology,Linzhou,Lhasa 851611,Tibet,People’s Republic of China [4]Institute of Plateau Ecology,Tibet Agricultural and Animal Husbandry University,Linzhi 860000,Tibet,People’s Republic of China

出　　处：《Journal of Forestry Research》2024年第5期37-46,共10页林业研究（英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0301);NationalNatural Science Foundation of China(32271886 and 42271074).

摘　　要：Temporal changes in the relationship between tree growth and climate have been observed in numerous forests across the world.The patterns and the possible regu-lators(e.g.,forest community structure)of such changes are,however,not well understood.A vegetation survey and analyses of growth-climate relationships for Abies georgei var.Smithii(Smith fir)forests were carried along an altitudi-nal gradient from 3600 to 4200 m on Meili Snow Mountain,southeastern Tibetan Plateau.The results showed that the associations between growth and temperature have declined since the 1970s over the whole transect,while response to standardized precipitation-evapotranspiration indices(SPEI)strengthened in the mid-and lower-transect.Comparison between growth and vegetation data showed that tree growth was more sensitive to drought in stands with higher species richness and greater shrub cover.Drought stress on growth may be increased by heavy competition from shrub and herb layers.These results show the non-stationary nature of tree growth-climate associations and the linkage to for-est community structures.Vegetation components should be considered in future modeling and forecasting of forest dynamics in relation to climate changes.

关 键 词：Climate change Tree rings Altitudinal gradient Community structure Plant diversity 

分 类 号：S718.5[农业科学—林学]