摘要
水力结构是植物适应环境变化形成的不同形态结构和水分运输供给策略.开展不同耐旱型杉木茎枝水力结构研究,对揭示杉木的耐旱机理、筛选耐旱杉木基因型和精准造林配置具有重要的理论及实践意义.以课题组前期筛选的忍耐型与敏感型杉木幼苗为研究对象,分析不同耐旱型杉木茎枝的功能性状、水力结构及二者的相关关系,结果表明:杉木茎的总直径和边材横截面积表现为忍耐型>敏感型(P <0.001),而侧枝的边材横截面积表现为忍耐型<敏感型(P <0.05);两种耐旱型杉木茎、枝的导水率、比导率、叶比导率均表现为忍耐型>敏感型(P <0.001),而忍耐型侧枝的胡伯尔值小于敏感型(P <0.001);两种耐旱型杉木不同器官的导水率、比导率、叶比导率表现为主茎>侧枝(P <0.001),而胡伯尔值表现为主茎<侧枝(P <0.001).相关性分析表明忍耐型杉木水力结构参数与主茎性状的相关性更明显,而敏感型杉木侧枝的水力结构与其性状更相关,忍耐型杉木主茎的导水率、比导率与心材直径极显著正相关(P <0.01),忍耐型杉木侧枝的导水率、比导率与总直径极显著正相关(P<0.01),敏感型杉木侧枝的胡伯尔值与其心材直径、边材横截面积极显著正相关(P <0.01).可见,忍耐型杉木主要采取积极主动的生存策略响应干旱逆境,如增加主茎的总直径和边材横截面积以提高水分疏导能力、减小侧枝直径来降低水分消耗等,而干旱条件下敏感型杉木则采取被动忍耐的策略,如减小主茎的直径以降低导水率、增大侧枝的胡伯尔值来承载更少的叶片质量等.(图2表2参32)
Modulating hydraulic architecture is a morphological structure and water transportation strategy in plants in response to environmental changes. Studies on the hydraulic architecture of the stems and branches of different drought-tolerant Chinese fir species have important theoretical and practical significance in revealing drought tolerance mechanisms, screening drought-tolerant genotypes, and planning precise afforestation configurations. Different drought-tolerant types(drought-tolerant and drought-sensitive), previously screened by our group, were used as the study materials. The functional characteristics, hydraulic architecture values,and correlations between the main stems and primary branches among different drought-tolerant Chinese fir plantlets were analyzed. The total diameter and sapwood cross-sectional area of the main stems were in the order drought-tolerant type > drought-sensitive type(P < 0.001), whereas those of the primary lateral branches were in the order drought-tolerant type < drought-sensitive type(P < 0.001). The hydraulic conductivity(Kh),specific hydraulic conductivity(Ks), and leaf-specific hydraulic conductivity(LSC) of the main stems and primary lateral branches were significantly higher for the tolerant type than for the sensitive type(P < 0.001), whereas the Huber value(Hv) showed the opposite trend(P < 0.001). The Kh, Ks, and LSC of different drought tolerant types were in the order main stems > primary lateral branches, whereas the Hv showed the order main stems < primary lateral branches. The hydraulic parameters of drought-tolerant Chinese fir were more significantly correlated with the main stems, whereas the hydraulic parameters of drought-sensitive Chinese fir were more significantly correlated with the primary lateral branches. For the drought-tolerant type, the Kh and Ks of the stems were significantly positively correlated with heartwood diameter(P < 0.01), and the values of the lateral branches were significantly positively correlated with total diameter(P < 0.01). For t
作者
李树斌
郑茹萍
周丽丽
郑对
黄小艳
吴亚岚
LI Shubin;ZHENG Ruping;ZHOU Lili;ZHENG Dui;HUANG Xiaoyan;WU Yalan(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;College of Geography and Oceanography,Minjiang University,Fuzhou 350108,China;Chinese Fir Engineering Technology Research Center of the State Forestry and Grassland Administration,Fuzhou 350002,China;College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350108,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2022年第6期1571-1577,共7页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(32001306、32 2718 6 4)
福建省自然科学基金项目(2021J011045)
福建农林大学科技创新专项基金项目(CXZX2017106)资助。
关键词
杉木
忍耐型
敏感型
水力结构
功能性状
相关关系
Chinese fir
drought-tolerant type
drought-sensitive type
hydraulic architecture
functional characteristics
correlative relationships
