种植密度和氮添加对拟南芥生物量产量和叶片化学计量特征的影响

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中文摘要：种植密度和氮供应量可以影响植物的生存和养分利用策略,但这两个因子对植物生长和元素平衡的交互影响目前仍不清楚.本研究以拟南芥(Arabidopsis thaliana)为研究对象开展控制实验,设置4个种植密度和4个氮添加水平的组合处理,探究了植物生物量产量(用总生物量和生物量分配来表征)和养分利用策略(用叶片氮磷计量来表征)的相应变化.研究结果表明,生物量-密度关系受到氮供应量的调控,在低氮水平下呈负相关关系,而在高氮水平下呈现近似最终产量恒定的趋势.过量的氮添加在低密度下抑制植物生长,而这种负影响随着种植密度的增加而逐渐得到缓解.根冠比在低氮水平下随种植密度的增加而增加,但在高氮水平下随种植密度的增加而降低.相比种植密度,氮供应量对叶片氮磷计量特征存在更重要的调控作用:随着氮添加水平的增加,叶片氮含量(或磷含量)呈现增加(或降低)的趋势,导致这两种元素浓度间存在负相关幂律关系.总之,这些研究结果表明,氮供应量和种植密度对拟南芥的生物量产量和叶片化学计量特征存在交互作用.因此,今后预测植物在养分变化下的种间竞争时需要考虑这两个因子间的交互作用.

外文标题：Interactive effects of plant density and nitrogen availability on the biomass production and leaf stoichiometry of Arabidopsis thaliana

外文摘要：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 behaviour under intraspecific competitive environments in the context of nutrient changes.

外文关键词：

Arabidopsis thalianaconstant final yieldbiomass partitioningnitrogen availabilityplant densityplant stoichiometryscaling relationship

作者：

Zheng-Bing Yan、Di Tian、Han-Yue Huang、Yuan-Feng Sun、Xing-Hui Hou、Wen-Xuan Han、Ya-Long Guo、Jing-Yun Fang

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作者单位：

Institute of Ecology,College of Urban and Environmental Sciences,Peking University,Beijing 100871,China

State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

The Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,Beijing 100083,China

State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

Key Laboratory of Plant-Soil Interactions of the Ministry of Education,College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China

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关键词：

拟南芥(Arabidopsis thaliana) 最终产量恒定生物量分配氮供应量种植密度植物化学计量幂律关系

基金：

国家自然科学基金国家自然科学基金国家自然科学基金国家重点研发计划

项目编号：

3190108631988102318003972017YFC0503906

出版年：

2023

DOI：

10.1093/jpe/rtac101

植物生态学报(英文版)

CSCD

ISSN：1752-9921

年,卷(期)：2023.(3)

参考文献量48