文献类型：期刊文献

英文题名：Hydraulic safety predicts long-term growth of economical timber tree species planted in a degraded tropical karst area

作者：Huang, Dong-Liu[1] Li, Zhong-Guo[1,2] Xiang, Wei[1] Cao, Kun-Fang[1] Zhu, Shi-Dan[1]

第一作者：Huang, Dong-Liu

通信作者：Zhu, SD[1]

机构：[1]Guangxi Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Guangxi, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Guangxi, Peoples R China

年份：0

外文期刊名：TREES-STRUCTURE AND FUNCTION

收录：;EI(收录号：20221712033690);Scopus(收录号：2-s2.0-85128741961);WOS:【SCI-EXPANDED(收录号:WOS:000786225100001)】；

基金：This work was supported by the Central Research Institute of Basic Research and Public Service Special Operations, Chinese Academy of Forestry (CAFYBB2018MA004), the Scientific Fund Project of Tropical Forestry Experimental Center, Chinese Academy of Forestry (RL2017-03), the National Natural Science Foundation of China (32060330), and the Bagui Young Scholarship of Guangxi Zhuang Autonomous Region (2019AQ06).

语种：英文

外文关键词：Afforestation; Cavitation; Growth rate; Hydraulic conductivity; Hydraulic safety margin; Karst degradation

摘要：Key message Xylem hydraulic safety is a good predictor of long-term growth of the economical tropical timber tree species planted in the degraded tropical karst areas. Planting native economical timber tree species in the degraded dry tropical karst areas has been proven to be an effective restoration way. However, drought is the key limiting factor influencing growth performance of the reforestation tree species in such habitats. In this study, we investigated long-term growth rate of seven precious timber tree species in a tropical rocky desertification area three decades after planting, and measured a series of hydraulic-related traits for these species. By examining hydraulic-growth relationships across the seven species, we aimed to explore whether hydraulic traits can be used to predict tree growth. Our results showed that long-term growth rate was significantly related to xylem water potential causing 88% loss of hydraulic conductivity and hydraulic safety margin under extreme drought. However, it was not associated with hydraulic conductivity, Huber value, wood density, and xylem anatomical traits. Additionally, there was no trade-off between hydraulic efficiency and safety, with several timber tree species showing both high hydraulic conductivity and cavitation resistance. Our results suggest that the hydraulic safety-related traits are good predictor of long-term growth rate of the economical timber tree species planted in degraded dry karst areas, thus providing guidelines to improve the efficiency of future ecological restoration.