Sex-specific responses of tree-ring growth to climate in the dioecious tree Populus cathayana  

作　　者：Kechao Huang Yongmei Liao Tingfa Dong Yanxia Yang Jundong He Huihui Huan Qibing Zhang Xiao Xu 

机构地区：[1]Key Laboratory of Southwest China Wildlife Resources Conservation,China West Normal University,Ministry of Education,No.1 Shida Road,Nanchong,Sichuan 637009,China [2]Guangxi Institute of Botany,Chinese Academy of Sciences,Guilin,No.85 Yanshan Street,Yanshan District,Guangxi 541006,China [3]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,No.20 Nanxincun,Xiangshan,Beijing 100093,China [4]College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,No.306 ZhaoWu Da Road,Saihan District,Hohhot 010018,China

出　　处：《Journal of Plant Ecology》2018年第5期771-779,共9页植物生态学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(31170389 and 31370596);the Innovative Team Foundation of the Sichuan Provincial Department of Education(14TD0015).

摘　　要：Aims Radial growth in response to climate has been reported in many trees,but the sex-specific responses of tree-ring growth associated with altitude in dioecious trees are still poorly known.This study aims to examine whether(i)there are sex-related responses of tree-ring growth to climate in dioecious trees;(ii)these responses could be changed with altitude elevation.Methods The tree-ring width and basal area increment(BAI)were measured over the past 30 years(1982-2011),and the sexual differences in relationship between BAI and time span and correlations between ring width and climatic factors were investigated in Populus cathayana trees at two altitude sites(1,450 m and 1,750 m a.s.l.)in Xiaowutai Mountain,Hebei,north China.Important Findings The BAI was increased over the past 30 years.Trees at high-altitude sites had significantly lower mean ring width and mean BAI than those trees at low-altitude sites(P<0.001).In addition,sexual dif-ferences in tree-ring growth and its response to climate were more pronounced by altitude elevation.Male trees had a significantly larger mean ring width and mean BAI than did females at high-alti-tude sites,whereas no significant sexual differences in these traits were detected at low-altitude sites.Female trees were sensitive to previous October-November temperatures at high altitude but to current February and April precipitation at low altitude(P<0.05),whereas male trees were sensitive to current June temperature at high altitude but to January precipitation at low altitude(P<0.05).Our results indicated that the responses of tree-ring growth to cli-mate are sex dependent and can be changed with altitude elevation.

关 键 词：ALTITUDE basal area increment(BAI) DENDROCLIMATOLOGY DIOECIOUS Populus cathayana and ring width 

分 类 号：P46[天文地球—大气科学及气象学]