文献类型：期刊文献

英文题名：Combining tree-ring growth and carbon isotope data enhances the understanding of climate sensitivity and physiological responses for Chinese fir in a common garden

作者：Wang, Hong[1,2] Duan, Aiguo[1,2,3] Liu, Xiaoying[1,2] Zhu, Anming[1,2] Zhang, Jianguo[1,2,3]

第一作者：王辉

通信作者：Duan, AG[1];Duan, AG[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[3]Nanjing Forestry Univ, Collaborat Innovat Ctr Sustainable Forestry Southe, Nanjing 210037, Peoples R China

年份：2024

卷号：358

外文期刊名：AGRICULTURAL AND FOREST METEOROLOGY

收录：;Scopus(收录号：2-s2.0-85205299822);WOS:【SCI-EXPANDED(收录号:WOS:001330884400001)】；

基金：This research was supported by the National Natural Science Foun-dation of China (Project 32271862 and 31370629) . We thank two anonymous reviewers for their valuable comments on the manuscript.

语种：英文

外文关键词：Provenance; Basal area increment; Stable carbon isotopes; Intrinsic water-use efficiency; Climate change; Adaptation

摘要：Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) is one of China's most important tree species, and possible adverse factors affecting its growth and physiology is of particular concern for climate change adaptation. In this context, growth performance (BAI: basal area increment and MAXD: maximum density), climate sensitivity, and the relative contributions of climatic and physiological determinants to growth were evaluated across the 30 Chinese fir provenances using a combination of dendroclimatology and carbon isotope analysis (delta 13C). Over the past 27 years, intrinsic water-use efficiency (iWUE) increased significantly by 12.71-33.56 %, while radial growth decreased (-63.38 % to -88.93 %). Strong growth decreases reflected increasing water stress due to climate warming, which was not offset by greater iWUE. A similar trend was observed in the theoretical gas exchange scenario as a response to increasing Ca as stomata opened and Ci increased proportionally to Ca. This study identified temperature and relative humidity as determinants of growth and physiology. However, meteorological factors (temperature, relative humidity, and sunshine hours) contributed much less to growth than physiological factors (iWUE). Variation in performance and climate sensitivity among populations significantly correlated with the mean annual temperature of the seed source origin. In general, seed sources from warmer and more humid climates in the center region grew faster and had higher iWUE. Provenances from drier climates had slower growth, higher wood density, and higher carbon isotope discrimination (Delta 13C) compared to those from wetter climate conditions. Compared to provenances from cooler regions, the seed sources from warmer climates were less sensitive to temperature but more sensitive to sunshine hours for BAI and MAXD. These results contribute to a better understanding of the climate sensitivity and physiological responses of the Chinese fir provenances to long-term changing climate.