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植物研究 ›› 2023, Vol. 43 ›› Issue (5): 720-728.doi: 10.7525/j.issn.1673-5102.2023.05.009

• 生理与生态 • 上一篇    下一篇

干旱条件对鬼针草和醉鱼草种间相互作用及生长的影响

陈家兴, 王姝(), 陈林丽, 侯夏丽, 杨庆祝, 尹任娅   

  1. 贵州大学林学院,贵阳 550025
  • 收稿日期:2023-06-12 出版日期:2023-09-20 发布日期:2023-09-05
  • 通讯作者: 王姝 E-mail:lnbx625@163.com
  • 作者简介:陈家兴(1997—),男,硕士研究生,主要从事植物生态学研究。
  • 基金资助:
    国家自然科学基金项目(32171511)

Effects of Drought Conditions on Interspecific Interactions and Growth of Bidens pilosa and Buddleja lindleyana

Jiaxing CHEN, Shu WANG(), Linli CHEN, Xiali HOU, Qingzhu YANG, Renya YIN   

  1. Forest College,Guizhou University,Guiyang 550025
  • Received:2023-06-12 Online:2023-09-20 Published:2023-09-05
  • Contact: Shu WANG E-mail:lnbx625@163.com
  • About author:CHEN Jiaxing(1997—),male,major in plant ecology.
  • Supported by:
    National Natural Science Foundation of China(32171511)

摘要:

为研究干旱对入侵植物鬼针草(Bidens pilosa)和本地种醉鱼草(Buddleja lindleyana)种间关系及生长的影响,试验设置2种栽植方式:种间组(2种植物各1株栽植于1个花盆)和挡板组(在种间组中添加挡板分离2株植物),分别进行水分处理,包括对照组(90%~100%饱和含水量)和干旱组(30%~35%的饱和含水量),测量植物形态、生物量,计算植物各特征的相对生长率和相对邻株效应指数。结果表明:(1)干旱条件下鬼针草根、茎、叶和总生物量的种间关系均为促进;而水分条件改变醉鱼草的种间关系,干旱处理为竞争,对照处理下为促进。(2)干旱下种间作用增加了鬼针草根、茎、叶生物量的相对生长率和根冠比,降低了醉鱼草比叶面积和根冠比 (P<0.05)。(3)种间作用显著增加2个物种根长、根表面积和根尖数的生长(P<0.05)。研究表明,种间相互作用能提高干旱下鬼针草的生长表现,使其在干旱生境中具有优势,可能是鬼针草的入侵策略。

关键词: 种间相互作用, 干旱, 相对生长率, 入侵植物, 鬼针草

Abstract:

In order to investigate the effects of drought on the interspecific relationship and growth of the invasive plant Bidens pilosa and the native species Buddleja lindleyana, two methods were designed: interspecific group(one plant of each of two species were planted in a pot) and baffled group(a baffle separated the two plants in the interspecific group), and two water treatments were applied, including the drought group (30%-35% saturated moisture content) and control group(90%-100% saturated moisture content), and plant morphological characteristics, biomass, relative growth rate, and relative neighbor effect index of each plant feature were measured respectively. The results showed that: (1)under both drought conditions, interspecific interactions promoted the root, stem, leaf, and total biomass of Bidens pilosa, whereas water availability altered the interspecific interactions of Buddleja lindleyana, with competition under the drought treatment and facilitation under the control treatment; (2)under drought conditions, interspecific interactions increased the relative growth rate and root-to-shoot ratio of Bidens pilosa root, stem, and leaf biomass, and decreased the specific leaf area and root-to-shoot ratio of Buddleja lindleyanaP<0.05). (3)Interspecific interactions significantly promoted the growth of root length, root surface area, and root tip number in both species(P<0.05). The results indicate that interspecific interactions promote the growth performance of Bidens pilosa under drought conditions, provid it with a competitive advantage in arid habitats, potentially as part of its invasion strategy.

Key words: interspecific interaction, drought, relative growth rate, invasive plant, Bidens pilosa

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