CO<sub>2</sub>浓度升高对不同水分养分条件下小麦幼苗生长的影响

司福艳<sup>1; 2</sup>; 乔匀周<sup>1</sup>; 董宝娣<sup>1</sup>; 师长海<sup>1</sup>; 姜净卫<sup>3</sup>; 陈骎骎<sup>1; 2</sup>; 郑 鑫<sup>1; 2</sup>; 刘孟雨<sup>1</sup>

司福艳，乔匀周，董宝娣，师长海，姜净卫，陈骎骎，郑鑫，刘孟雨.CO₂浓度升高对不同水分养分条件下小麦幼苗生长的影响[J].干旱地区农业研究,2015,33(1):54~59

CO₂浓度升高对不同水分养分条件下小麦幼苗生长的影响

Effects of elevated CO₂ concentration on the growth of wheat seedlings under different water potential and nutrition concentrations

DOI：10.16302/j.cnki.1000-7601.2015.01.009

中文关键词: CO₂浓度升高氮素水分胁迫小麦幼苗干物质积累

英文关键词:elevated CO₂ concentration nitrogen water stress wheat seedling dry matter accumulation

基金项目:国家科技支撑计划项目（2012BAD08B02，2013BAD05B02）；国家自然科学基金（31170415，31100191，30870411）；河北省自然科学基金（C2011503003，C2012503003）；河北省科技支撑项目(14226403D)

作者	单位
司福艳^1,2，乔匀周¹，董宝娣¹，师长海¹，姜净卫³，陈骎骎^1,2，郑鑫^1,2，刘孟雨¹	(1.中国科学院遗传与发育生物学研究所农业资源研究中心，河北省节水农业重点实验室，中国科学院农业水资源重点实验室，石家庄 050021；2.中国科学院大学，北京 100049； 3.山东农业大学水利土木工程学院，山东泰安 271018)

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中文摘要:

设置了5个氮素浓度梯度（N₀、N₁、N₂、N₃、N₄）、3个PEG（P₀、P₁、P₂）浓度梯度以及2个CO₂浓度（370±50 μmol·mol^-1； 700±50 μmol·mol^-1）水平的盆栽试验，探究了小麦幼苗生长、物质积累与分配以及植株水分条件的变化规律。结果表明：小麦幼苗株高、地上部干重、根干重、生物量以及叶水势的最大值以及高浓度CO₂的最大刺激作用均出现在处理N₁P₀；而根长和根冠比的最大值分别出现在处理N₀P₀和N₁P₂，高浓度CO₂的最大刺激值也分别出现在处理N₀P₀和N₁P₂；适宜养分条件下，高浓度CO₂能够最大限度地促进小麦幼苗的生长，同时高浓度CO₂通过提高小麦幼苗叶水势，一定程度上缓解了低浓度PEG胁迫的不利影响。因此，未来CO₂浓度升高将对水肥条件好的小麦产生促进作用，可缓解轻度水分不足的不利影响，而对严重干旱胁迫下小麦的生长作用不明显。

英文摘要:

On the basis of hydroponic experiment, this pot study included five nitrogen concentration levels (N₀、N₁、N₂、N₃、N₄), three PEG concentration levels (P₀、P₁、P₂), and two CO₂ concentrations (370±50 μmol·mol^-1； 700±50 μmol·mol^-1). We studied the growth, dry matter accumulation and distribution, and water relation of wheat seedlings in different conditions. The results showed that plant height, shoot dry weight, root weight, biomass, and leaf water potential reached their maximums at N₁P₀, and so were the effects of elevated CO₂ concentration. Maximal root length and root to shoot ratio appeared at N₀P₀ and N₁P₂ respectively. The biggest influence of elevated CO₂ arose under the same condition. High CO₂ concentration could mostly improve the growth of wheat seedlings at appropriate condition. At the same time, elevated CO₂ could improve leaf water potential of wheat seedlings, which reduced the negative effects of PEG stress to some extent. Therefore, elevated CO₂ concentration would improve the growth of wheat and remit the negative effects of mild water stress, whereas subtle effect might be observed if wheat growth was under severe drought.

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