林业科学 ›› 2021, Vol. 57 ›› Issue (7): 194-204.doi: 10.11707/j.1001-7488.20210721
• 研究简报 • 上一篇
叶琳峰1,李彦1,2,3,王忠媛1,2,3,陆世通1,潘天天1,陈森1,谢江波1,2,3,*
收稿日期:
2020-08-20
出版日期:
2021-07-25
发布日期:
2021-09-02
通讯作者:
谢江波
基金资助:
Linfeng Ye1,Yan Li1,2,3,Zhongyuan Wang1,2,3,Shitong Lu1,Tiantian Pan1,Sen Chen1,Jiangbo Xie1,2,3,*
Received:
2020-08-20
Online:
2021-07-25
Published:
2021-09-02
Contact:
Jiangbo Xie
摘要:
目的: 干旱导致的树木衰退甚至死亡并不局限于干旱地区,湿润区树木干旱适应能力弱,更易因水力失效而死亡。建立湿润区树木器官水平上的木质部结构与水力功能性状(包括输水效率和安全)的数量关系,是解答湿润区树木干旱致死机制的关键。方法: 以湿润地区马尾松、日本五针松和湿地松为对象,测定其枝条、根的木质部水力功能性状(导水率与栓塞抗性)和结构性状(管胞、纹孔特征等)。结合已发表的其他松属树种相关数据,检验了松属枝条与根的水力效率-水力安全权衡;定量分析了木质部输水效率(Ks,单位边材面积的导水率)和栓塞抗性(P50,导水率损失50%时的木质部水势)的结构基础。结果: 1)对所研究的松属3个种,根比导率(Ksr,根单位边材面积的导水率)>枝条比导率(Kss,枝条单位边材面积的导水率),根P50 > 枝条P50;Kss与Ksr正相关,枝条P50与根P50也呈正相关;3个种均属低效率低安全性树种。2)相关分析表明:Kss与枝条P50负相关,枝条存在效率-安全权衡;Ksr与根P50的决定系数接近0(R2=0.01,P=0.94),即根无效率-安全权衡。这种功能权衡关系由其解剖结构决定:Kss与枝条P50对结构的需求趋异(枝条有效率-安全权衡),而Ksr与根P50对结构的需求趋同(根无效率-安全权衡)。3)冗余分析表明,枝条纹孔膜面积对Kss解释度最高,枝条纹孔塞面积对枝条P50解释度最高;根木材密度对Ksr解释度最高,根塞缘面积对根P50解释度最高。结论: 枝条和根的输水效率、栓塞抗性主要由木质部结构决定,其中纹孔结构影响最大,木材密度与管胞壁厚度次之。马尾松、日本五针松和湿地松的枝条存在效率-安全权衡,而根不存在这种权衡,其相关的结构性状解释为:效率与安全的结构需求趋异存在权衡,趋同则无权衡。
中图分类号:
叶琳峰,李彦,王忠媛,陆世通,潘天天,陈森,谢江波. 湿润地区3种松属植物枝和根导水系统的效率-安全关系[J]. 林业科学, 2021, 57(7): 194-204.
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