文献类型：期刊文献

英文题名：Water storage capacity is inversely associated with xylem embolism resistance in tropical karst tree species

作者：Liu, Yan-Yan[1,2] Chao, Lin[2] Li, Zhong-Guo[1,3] Ma, Lin[2] Hu, Bao-Qing[2] Zhu, Shi-Dan[1] Cao, Kun-Fang[1]

第一作者：Liu, Yan-Yan

通信作者：Zhu, SD[1];Cao, KF[1]

机构：[1]Guangxi Univ, Coll Forestry, State Key Lab Conservat & Utilizat Subtrop Agrobio, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Guangxi, Peoples R China;[2]Nanning Normal Univ, Minist Educ, Key Lab Environm Change & Resources Use Beibu Gulf, Guangxi Key Lab Earth Surface Proc & Intelligent S, Nanning 530001, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Guangxi, Peoples R China

年份：2024

卷号：44

期号：3

外文期刊名：TREE PHYSIOLOGY

收录：;Scopus(收录号：2-s2.0-85187960461);WOS:【SCI-EXPANDED(收录号:WOS:001185045100005)】；

基金：This work was financed by the National Natural Science Foundation (grants 31800333, 32160252) of China, China Postdoctoral Science Foundation (2019M663870XB), the Project for Local Science and Technology Development in Central Government Guides (AD19245133, AD20238078) and the Natural Science Foundation of Guangxi Zhuang Autonomous Region (2018GXNSFBA138009).

语种：英文

外文关键词：hydraulic conductivity; pit membrane; tradeoff; vestured pits

摘要：Tropical karst habitats are characterized by limited and patchy soil, large rocky outcrops and porous substrates, resulting in high habitat heterogeneity and soil moisture fluctuations. Xylem hydraulic efficiency and safety can determine the drought adaptation and spatial distribution of woody plants growing in karst environments. In this study, we measured sapwood-specific hydraulic conductivity (K-s), vulnerability to embolism, wood density, saturated water content, and vessel and pit anatomical characteristics in the branch stems of 12 evergreen tree species in a tropical karst seasonal rainforest in southwestern China. We aimed to characterize the effects of structural characteristics on hydraulic efficiency and safety. Our results showed that there was no significant correlation between K-s and hydraulic safety across the tropical karst woody species. K-s was correlated with hydraulic vessel diameter (r = 0.80, P < 0.05) and vessel density (r = -0.60, P < 0.05), while the stem water potential at 50 and 88% loss of hydraulic conductivity (P-50 and P-88) were both significantly correlated with wood density (P < 0.05) and saturated water content (P = 0.052 and P < 0.05, respectively). High stem water storage capacity was associated with low cavitation resistance possibly because of its buffering the moisture fluctuations in karst environments. However, both K-s and P-50/P-88 were decoupled from the anatomical traits of pit and pit membranes. This may explain the lack of tradeoff between hydraulic safety and efficiency in tropical karst evergreen tree species. Our results suggest that diverse hydraulic trait combination may facilitate species coexistence in karst environments with high spatial heterogeneity.