热带亚热带植物学报2024，Vol.32Issue(1)：1-9,9.DOI:10.11926/jtsb.4797
中国热带珊瑚岛优势木本植物抗风桐和草海桐的水分适应策略解析
Hydraulic Adaptation Strategies of Dominant Woody Plants Pisonia grandis and Scaevola sericea on Tropical Coral Islands of China
摘要
Abstract
Plant hydraulic traits can reflect the adaptability of plants to different water conditions.It is important to study the hydraulic traits of dominant plants in the special habitat of tropical coral islands for a deep understanding of the hydraulic adaptation strategies of tropical coral island plants,and for selecting suitable tree species for tropical coral island vegetation construction and restoration.Thus,the leaf and branch hydraulic traits of two representative dominant tree species in the habitat of tropical coral islands of China,i.e.,Pisonia grandis and Scaevola sericea,were measured,and their hydraulic adaptation strategies were compared and analyzed.The results showed that the leaf embolism resistance,leaf turgor point and branch specific xylem conductivity of P.grandis were significantly higher than those of S.sericea,but the values of branch embolism resistance,leaf hydraulic conductance,sapwood density and leaf to stem area ratio were significantly lower than those of S.sericea.Furthermore,leaves of P.grandis were more resistant to embolism than branches,and were sensitive to water stress.Meanwhile,high water transport efficiency in branches of P.grandis provided sufficient water to ensure the high transpiration of the leaves.On the other hand,there was a significant hydraulic vulnerability segmentation between leaves and branches of S.sericea.The leaves of S.sericea could act as"safety valves"to protect branch hydraulic pathway from dysfunction.Pisonia grandis and S.sericea could adapt to the special habitats of tropical coral islands by coordinating the water transport efficiency and safety of leaves and branches and adopting different hydraulic strategies.关键词
植物水力性状/栓塞/水力脆弱性分区/水分运输/热带珊瑚岛植物Key words
Hydraulic vulnerability segmentation/Plant hydraulic trait/Embolism/Tropical coral island plant/Water transport引用本文复制引用
唐玮泽,李沁,张浩萍,金益,李强,殷德意,叶清,刘慧..中国热带珊瑚岛优势木本植物抗风桐和草海桐的水分适应策略解析[J].热带亚热带植物学报,2024,32(1):1-9,9.基金项目
国家重点研发计划项目(2021YFC3100401) （2021YFC3100401）
国家自然科学基金项目(32371575) （32371575）
中国科学院华南植物园青年人才专项(QNXM-01) （QNXM-01）
中国科学院重点部署项目(KGFZD-135-19-08)资助This work was supported by the National Key R&D Program of China(Grant No.2021YFC3100401),the National Natural Science Foundation of China(Grant No.32371575),the Special Project for Youth Talent of South China Botanical Garden,Chinese Academy of Sciences(Grant No.QNXM-01),and the Key Research Program of Chinese Academy of Sciences(Grant No.KGFZD-135-19-08). （KGFZD-135-19-08）
