【摘要】 【目的】探究亚热带不同树种枝叶器官金属元素含量和重吸收特征。【方法】以四川农业大学崇州同质园中大叶樟（Cinnamomum platyphyllum）、樟树（Cinnamomum camphora）、油樟（Cinnamomum longepaniculatum）、天竺桂（Cinnamomum japonicum）、香椿（Toona sinensis）、红椿（Toona ciliata）和桤木（Alnus cremastogyne）7个亚热带阔叶树种为研究对象，采集植物成熟和凋落枝、叶样品，测定各树种成熟和凋落枝、叶的Zn、Mn和Cr含量，并计算元素重吸收效率。【结果】(1)樟树、天竺桂成熟和凋落枝、叶的Zn、Mn含量显著高于其他树种，大叶樟成熟和凋落叶Cr含量整体显著高于其他树种。红椿成熟叶片Cr含量显著高于其他树种，香椿和桤木凋落枝Zn含量显著高于其他树种。同质园树种叶片3种元素含量整体均高于枝条。(2)不同树种Zn、Mn和Cr元素重吸收效率整体表现为负吸收，而红椿和桤木的枝、叶3种金属元素重吸收效率显著高于其他树种；落叶树种枝、叶金属元素重吸收效率总体高于常绿树种。(3)Zn、Mn在成熟和凋落枝、叶中有较强的协同关系，并且Cr与Zn、Mn分别在凋落枝和叶中均表现为协同关系。【结论】植物地上部器官枝和叶的金属元素含量及其重吸收效率特征受树种影响显著，相较于其他树种，樟树和天竺桂通过将重金属元素排出体外表现出更好的抗逆性，具有更强的环境适应能力。研究有助于深入理解不同树种的金属元素平衡规律和环境适应策略，并且从植物耐受重金属胁迫角度出发，樟树和天竺桂更适于成都平原大面积种植。更多还原

【Abstract】 【Objective】 This study aims to explore the metal content and reabsorption characteristics of twigs and leaves organs of different subtropical tree species.【Method】 Seven subtropical broad-leaf tree species were studied in the Chongzhou common-garden of Sichuan Agricultural University: Cinnamomum platyphyllum, Cinnamomum camphora, Cinnamomum longepaniculatum, Cinnamomum japonicum, Toona sinensis, Toona ciliata, Alnus cremastogyne. Samples of mature and withered twigs and leaves were collected, the contents of Zn, Mn and Cr were determined in mature and withered twigs and leaves, and the element reabsorption efficiency was calculated.【Result】(1)The Zn and Mn contents of mature and withered twigs and leaves of C. camphora and C. japonicum were significantly higher than those of other tree species. The Cr content of mature and withered leaves of C. platyphyllum was significantly higher than that of other tree species, the Cr content of mature leaves of T. ciliata was significantly higher than that of other tree species, and the Zn content of mature and withered twigs of T. sinensis and A. cremastogyne was significantly higher than that of other tree species. The contents of the three elements of leaves of homogeneous garden species were higher than those of twigs overall.(2)The reabsorption efficiency of Zn, Mn and Cr elements of different tree species showed negative absorption overall, while the reabsorption efficiency of the three metal elements in the twigs and leaves of T. ciliate and A. cremastogyne was significantly higher than that of other tree species. The reabsorption efficiency of twigs and leaf metal elements of deciduous trees was generally higher than that of evergreen trees.(3)Zn and Mn have strong synergistic relationships in mature and withered twigs and leaves, and Cr exhibits synergistic relationships with Zn and Mn in withered twigs and leaves, respectively. 【Conclusion】 The metal content and reabsorption characteristics of twigs and leaves of plants in aerial organs are significantly affected by tree species. Compared to other tree species, Cinnamomum camphora and Cinnamomum japonicum exhibit better stress resistance and stronger environmental adaptability by expelling heavy metal elements from the body. This study is helpful to further understand the metal element balance patterns and environmental adaptation strategies of different tree species, and from the perspective of plant tolerance to heavy metal stress, Cinnamomum camphora and Cinnamomum japonicum are more suitable for large-scale planting on Chengdu Plain.更多还原