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植物研究 ›› 2023, Vol. 43 ›› Issue (2): 272-280.doi: 10.7525/j.issn.1673-5102.2023.02.012

• 生理与生态 • 上一篇    下一篇

不同生长阶段苘麻生物量分配对种群密度和土壤水分的响应

令狐克念, 王姝()   

  1. 贵州大学林学院,森林生态研究中心,贵阳 550025
  • 收稿日期:2022-05-20 出版日期:2023-03-20 发布日期:2023-03-07
  • 通讯作者: 王姝 E-mail:lnbx625@163.com
  • 作者简介:令狐克念(1996—),女,硕士研究生,主要从事修复生态学研究。
  • 基金资助:
    国家自然科学基金项目(NSFC31800335);贵州省基础研究项目计划(自然科学类)项目(黔科合基[2019]1089)

Responses of Biomass Allocation to Population Density and Soil Water in Abutilon theophrasti at Different Growth Stages

Kenian LINGHU, Shu WANG()   

  1. Forestry College,Forest Ecology Research Center,Guizhou University,Guiyang 550025
  • Received:2022-05-20 Online:2023-03-20 Published:2023-03-07
  • Contact: Shu WANG E-mail:lnbx625@163.com
  • About author:LINGHU Kenian(1996—),female,master,mainly engaged in restoration ecology.
  • Supported by:
    National Natural Science Foundation of China(31800335);Guizhou Province Science and Technology Fundamental Research Program(Qiankehe[2019]No.1089)

摘要:

通过研究不同生长阶段下植物生物量分配对土壤水分和种群密度的响应,揭示植物同时应对生物与非生物环境因子的策略。本研究在田间条件下对1年生草本植物苘麻(Abutilon theophrasti)进行加水和对照2种水分处理,每种处理下进行低、中、高3种种植密度处理,分别在生长20、50 d时测量植物根、茎、叶片、叶柄和繁殖(花和果实)生物量,探讨在不同生长阶段苘麻生物量分配如何响应于密度和水分。结果表明:植物生长20 d时,在加水处理中,与低密度相比,中密度提高了根生物量比率19.4%和根冠比21.5%,降低了叶生物量比率34.4%;未加水处理(对照)中生物量分配对密度的响应不显著;50 d时,对照处理下,高密度相对于低密度降低了总生物量63.5%,2种水分处理下高密度都降低了根冠比和根生物量比率,提高了茎生物量比率,不影响总生物量和其他器官生物量分配。结果说明施加水分前期更容易促进根生物量分配对密度的积极响应(增大),后期减缓高密度对总生物量的不利影响(降低)。生物量分配对密度的响应取决于种内相互作用的强度,早期适中水平的相互作用更容易产生地下促进作用,促进根部的积极响应。中密度下适中的种内相互作用也可以促进根生物量分配和总生物量对水分增加的积极响应。生长阶段可以通过影响植物个体大小而改变植物相互作用强度,进而改变生物量分配对密度和水分可用性的响应。

关键词: 生物量分配, 促进作用, 密度增大, 种内相互作用, 水分可用性, 生长阶段

Abstract:

To reveal the strategies of plants in dealing with biotic and abiotic envrionmental factors through investigating responses of biomass allocation to soil water and population density at different growth stages, in this experiment, we subjected plants of an annual herbaceous species of Abutilon theophrasti to treatments of water addition and no addition(control). Within each treatment, low, medium, and high densities were set up under field conditions, before measuring dry mass of root, stem, lamina, petiole and reproductive(flower and fruit) organs at day 20 and 50 of growth, to explore how biomass allocation of A. theophrasti respond to density and water addition, and effects of growth stage. Results showed at day 20, in water-added soil, compared to that at low density, medium density increased root mass ratio by 19.4% and root/shoot ratio by 21.5%, but decreased leaf mass ratio by 34.4%, with no response to density in biomass allocation in no-water-added soil(control). At day 50, in controlled soil, high relative to low density reduced total biomass by 63.5%; in both water treatments, high relative to low density reduced root/shoot ratio and root mass ratio, but increased stem mass ratio, with total mass and allocations of other organs unaffected. Results suggest that the additon of water is more likely to promote the active response(increase) of root mass allocation to increased density at early stage, and mitigated passive responses(decrease) of total biomass at later stage. The responses of biomass allocation to density may depend on the strength of intraspecific interactions, and at the early stage moderate level of interactions among plants will more likely lead to facilitation underground, promoting the active responses of roots, and moderate interactions among plants at medium density can also promote active responses of roots to water addition. Growth stage can modify the strength of plant-plant interactions via affecting plant size, and further affect the responses of biomass allocation to density and water availability.

Key words: Biomass allocation, facilitation, increased density, intraspecific interaction, water availability, growth stage

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