植物密度和氮素有效性对拟南芥生物量生产和叶片化学计量的交互影响

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
Zhengbing Yan, D. Tian, Han-Yue Huang, Yuan-Feng Sun, Xing-Hui Hou, W. Han, Ya-long Guo, Jingyao Fang
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引用次数: 0

摘要

植物密度和氮素有效性影响植物的生存和养分利用策略,但这两个因子之间的相互作用对植物生长和元素平衡的影响尚不清楚。本研究以拟南芥为研究对象,采用4个密度水平和4个N添加水平相结合的实验方法,研究了相应的植物生物量生产(以植物总生物量和生物量分配为指标)和养分利用策略(以叶片N和P化学计量为指标)的变化。生物量-密度关系受氮有效度调控,低氮有效度为负,高氮有效度为渐近常数。在低密度条件下,过量施氮会抑制植株生长,但增加密度可缓解这种影响。低氮有效度下,根冠生物量比随密度增大而增大,高氮有效度下,根冠生物量比随密度增大而减小。氮有效性比密度对叶片氮磷化学计量的调节更重要,随着施氮量的增加,叶片氮浓度升高,叶片磷浓度降低,两者呈负标度关系。研究结果表明,氮有效性和植物密度对拟南芥的生物量生产和叶片化学计量具有交互调节作用,并强调在养分变化背景下预测种内竞争环境下植物生长行为时应考虑这两个因子的交互效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interactive effects of plant density and nitrogen availability on the biomass production and leaf stoichiometry of Arabidopsis thaliana
Plant density and nitrogen (N) availability influence plant survival and nutrient use strategies, but the interaction between these two factors for plant growth and the balance of elements remains poorly addressed. Here we conducted experimental manipulations using Arabidopsis thaliana, with the combination of four levels of plant density and four levels of N addition, and then examined the corresponding changes in plant biomass production (indicated by total plant biomass and biomass partitioning) and nutrient use strategies (indicated by leaf N and phosphorus (P) stoichiometry). The biomass-density relationship was regulated by N availability, with a negative pattern in low N availability but an asymptotic constant final yield pattern at high N availability. Excessive N addition reduced plant growth at low plant density, but this effect was alleviated by increasing plant density. The root to shoot biomass ratio increased with plant density at low N availability, but decreased at high N availability. N availability was more important than plant density in regulating leaf N and P stoichiometry, with the increasing leaf N concentration and decreasing leaf P concentration under increasing N addition, resulting in a negative scaling relationship between these two elemental concentrations. Our results show that N availability and plant density interactively regulate plant biomass production and leaf stoichiometry of A. thaliana, and highlight that the interactive effects of these two factors should be considered when predicting plant growth behavior under intraspecific competitive environments in the context of nutrient changes.
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来源期刊
Journal of Plant Ecology
Journal of Plant Ecology 生物-植物科学
CiteScore
4.60
自引率
18.50%
发文量
134
审稿时长
3 months
期刊介绍: Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.
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