Growth response of Abies spectabilis to climate along an elevation gradient of the Manang valley in the central Himalayas  

作　　者：Samresh Rai Binod Dawadi Yafeng Wang Xiaoming Lu Huang Ru Shalik Ram Sigdel 

机构地区：[1]Key Laboratory of Alpine Ecology,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,People’s Republic of China [2]University of Chinese Academy of Sciences,Beijing 100000,People’s Republic of China [3]Central Department of Hydrology and Meteorology,Tribhuvan University,Kathmandu,Nepal [4]College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,People’s Republic of China

出　　处：《Journal of Forestry Research》2020年第6期2245-2254,共10页林业研究（英文版）

基　　金：We thank the Kathmandu Center for Research and Education,CAS-TU,for help during the fieldwork。

摘　　要：The Himalayas are characterized by a broad gradient of bioclimatic zones along their elevation.However,less is known how forest growth responds to climatic change along elevation.In this study,four standard treering width chronologies of Himalayan fir(Abies spectabilis)were developed,spanning 142–649 years along an elevation gradient of 3076–3900 m a.s.l.Principal component analysis classified the four chronologies into two groups;the ones at lower elevations(M1 and M2)and higher elevations(M3 and M4)show two distinct growth trends.Radial growth is limited by summer(June–August)precipitation at M3,and by precipitation during spring(March–May)and summer at M4.It is limited by spring temperatures and winter precipitation(December–February)at M1.Tree-ring width chronologies also significantly correlate with winter and spring Palmer Drought Severity Index(PDSI)at M1,and with summer PDSI at M3 and M4.Thus,Himalayan fir growth at high elevations is mainly limited by moisture stress rather than by low temperatures.Furthermore,the occurrence of missing rings coincides with dry periods,providing additional evidence for moisture limitation of Himalayan fir growth.

关 键 词：Climate signals Tree-ring width Abies spectabilis Radial growth Precipitation Manang valley HIMALAYAS 

分 类 号：S791.14[农业科学—林木遗传育种]