刺槐木质部栓塞脆弱性检测的方法比较

安瑞1 孟凤1 尹鹏先2 杜光源1

(1.西北农林科技大学理学院, 陕西杨凌 712100)
(2.西北农林科技大学林学院, 陕西杨凌 712100)
【知识点链接】纹孔膜

【摘要】在全球变暖的背景下, 植物木质部栓塞脆弱性是林木死亡率升高的重要生理学因素。然而不同方法在长导管树种上建立的栓塞脆弱性曲线存在较大差异。该研究以长导管树种刺槐 (Robinia pseudoacacia) 为研究对象, 利用自然干燥法、Cochard Cavitron离心机法以及Sperry离心机法建立了栓塞脆弱性曲线, 旨在探讨不同检测方法的合理性。在Sperry离心法中, 使用了两种规格的转子, 从而对“开口导管假象”学说进行了检验。研究结果表明:自然干燥法建立的栓塞脆弱性曲线为“s”形, 而Cochard Cavitron离心机法和Sperry离心机法建立的栓塞脆弱性曲线为“r”形;自然干燥法与离心机法建立的曲线存在显著性差异, 且两种离心机法建立的曲线也具有显著性差异。尽管刺槐枝条的导管长度分布表明14.4 cm长的刺槐枝条具有更高比例的开放导管, 但用Sperry离心机法在27.4 cm和14.4 cm长茎段上建立的栓塞脆弱性曲线相似, 表明Sperry离心机法检测刺槐脆弱性曲线时未产生“开口导管假象”, 具有更为可靠的检测结果。

【关键词】 栓塞脆弱性; 脆弱性曲线; 自然干燥法; Cochard Cavitron离心机法; Sperry离心机法;

【DOI】

【基金资助】 国家自然科学基金 (31201122和31570588) Supported by the National Natural Science Foundation of China (31201122 and 31570588)

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This Article

ISSN:1005-264X

CN:11-3397/Q

Vol 42, No. 11, Pages 1113-1119

November 2018

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知识点

摘要

  • 1 材料和方法
  • 2 结果和分析
  • 3讨论和结论
  • 参考文献