文献类型：期刊文献

英文题名：Climatic limitations of nearly endangered Juniperus rigida populations at their range edges in semiarid China

作者：Gao, Wenqiang[1] Liu, Jianfeng[2] Bao, Wenquan[3] He, Xiao[1] Fu, Liyong[1] Lei, Xiangdong[1]

第一作者：高文强

通信作者：Lei, XD[1]

机构：[1]Chinese Acad Forestry, Inst Forest Resource Informat Tech, State Key Lab Efficient Prod Forest Resources, Key Lab Forest Management & Growth Modelling State, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Res Inst Forestry, Beijing 100091, Peoples R China;[3]Inner Mongolia Agr Univ, Hohhot 010018, Peoples R China

年份：2024

卷号：54

外文期刊名：GLOBAL ECOLOGY AND CONSERVATION

收录：;Scopus(收录号：2-s2.0-85201681326);WOS:【SCI-EXPANDED(收录号:WOS:001301175600001)】；

基金：We thank the Forest Farm of Birch, Bureau of Natural Resources and Planning of Datong, the Helan Mountain National Nature Reserve Administration of Alxa League, the Helan Mountain National Nature Reserve Administration of Ningxia, and the Zhuolu County Forestry and Grassland Administration for their assistance with the fieldwork. This work was supported by the National Natural Science Foundation of China (No. 31800409) , and the Natural Science Foundation of Beijing (No. 5184036) .

语种：英文

外文关键词：Biogeography; Tree growth; Climate change; Drought; Distribution range; Non-monsoon region

摘要：The treat of climate warming is expected to increase the frequency and severity of droughts and significantly affect tree growth and distribution ranges, particularly in regions without monsoons. The distribution limits of tree species are highly susceptible to climate change. A deeper understanding of how tree species respond to climate across their distribution ranges is crucial for accurately predicting forest dynamics in the face of climate warming. Using tree ring width data from 586 trees at 19 sites spanning the northernmost and southernmost limits of Juniperus rigida (near-threatened, IUCN: NT), we assessed the growth responses of J. rigida to climate at different distribution range limits. We observed significant differences in tree-growth variability between the southern and northern populations of J. rigida, characterized by an increasing growth trend at the southern range limit, but a decreasing trend at the northern limit since 1996. Moreover, tree growth at their northern limit was hindered by high temperatures and SPEI during summer months, whereas it was constrained by low temperatures in March and precipitation in June at the southern limit. Particularly noteworthy is the increased sensitivity of growth to SPEI and precipitation in recent decades (1996-2018) compared to previous decades (1961-1995), particularly at their northern distribution edge. We therefore conclude that the growth of J. rigida trees at the southern limit could benefit from climate warming, while increasing warming and drought could limit tree growth or even cause tree mortality at the northern range limits. These findings may serve as an early warning for the growth and survival of J. rigida trees in open forests at their northern distribution edges in the face of future climate warming.