云南哀牢山两种常见半寄生植物的生态化学计量特征及其与寄主的关系

汤丹丹1,2 吴毅1,2 刘文耀1 胡涛1,2 黄俊彪1,2 张婷婷1,2

(1.中国科学院西双版纳热带植物园热带森林生态学重点实验室, 云南勐腊 666303)
(2.中国科学院大学, 北京 100049)

【摘要】为深入探究半寄生植物与其寄主间的养分关系, 在云南哀牢山徐家坝地区选取两种常见半寄生植物椆树桑寄生 (Loranthus delavayi) 和柳叶钝果寄生 (Taxillus delavayi) , 研究其寄主枝条-吸器-寄生枝条-寄生叶片间的碳 (C) 、氮 (N) 、磷 (P) 生态化学计量特征关系。结果表明:1) 两种半寄生植物的寄主枝条-吸器-寄生枝条-寄生叶片这一连续体的C、N、P生态化学计量特征变化趋势并不完全相同, 具有物种自身的特性。2) 同一半寄生植物的寄主枝条具有相似的C、N、P生态化学计量特征, 寄主物种对半寄生植物的生态化学计量特征没有显著影响。3) 寄主枝条的C、N、P生态化学计量特征间具有紧密的相关关系, 吸器弱于寄主枝条, 寄生枝条弱于吸器, 寄生叶片的N、P含量相关关系不显著。4) 寄主枝条与寄生叶片间的C含量存在极显著负相关关系。5) 吸器与寄主枝条间的C、N、P生态化学计量特征存在紧密的相关关系, 但在生态化学计量特征的数值上吸器与寄生枝条更为接近。吸器作为连接寄主与寄生植物的关键部位, 其与寄主枝条极为显著的相关关系体现了寄主枝条养分对寄生植物的重要性, 而吸器在元素含量、计量比的数值以及相互关系上与寄生枝条更为相似, 则体现了吸器作为寄生植物器官具有与寄生枝条相似的生理功能。通过对寄主枝条-吸器-寄生枝条-寄生叶片C、N、P生态化学计量特征的分析, 为深入研究半寄生植物的养分利用策略与生态适应性提供了重要的基础资料。

【关键词】 半寄生植物; 生态化学计量学; 枝条; 吸器; 叶片;

【DOI】

【基金资助】 国家自然科学基金 (31770496和41471050) Supported by the National Natural Science Foundation of China (31770496 and 41471050) 中国科学院生物多样性保护策略项目 (ZSSD-016) 和中国科学院“135项目” (2017XTBG-T01) Biodiversity Conservation Strategy Program of Chinese Academy of Sciences (ZSSD-016) , and the “135 Program” of Chinese Academy of Sciences (2017XTBG-T01)

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This Article

ISSN:1005-264X

CN:11-3397/Q

Vol 43, No. 03, Pages 245-257

March 2019

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摘要

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