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	干旱胁迫对小胡杨2号幼苗光合及生理特征的影响
其他题名	Effects of drought stress on photosynthesis and physiological characteristics of Populus simonii*P. euphraticaXiaohuyang 2'
	齐容镰; 莎仁图雅; 李钢铁; 李佳陶; 何亮; 杨文斌
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2020
卷号	37 期号:6 页码:1552-1561
中文摘要	本文以2 a生小胡杨2号幼苗为研究对象,采用盆栽持续干旱的方法探究其光合及生理特征对干旱逆境的响应,结果表明:(1)随干旱胁迫程度加剧,小胡杨2号主动调节自身光合机制以适应逆境条件,其净光合速率(Pn)等参数日变化曲线均由双峰型变为单峰型;同时,小胡杨2号积极调整水分利用策略,维持高水分利用效率以应对干旱环境。(2)轻度及中度干旱胁迫提升了小胡杨2号对强光的利用效率;重度干旱胁迫下苗木降低呼吸消耗保存光合产物、提高对弱光的利用能力以抵御干旱逆境。(3)经回归拟合,小胡杨2号Pn、蒸腾速率(Tr)、水分利用效率(WUE)与土壤含水量存在相应数学关系,确定适宜小胡杨2号幼苗生长的最优土壤水分范围为7.3% ~ 11.0%。 (4)小胡杨2号通过积累渗透调节物质与提高抗氧化酶活性来减轻干旱胁迫的伤害作用,但重度干旱也会使其保护酶活性受到抑制,最终使膜脂过氧化程度加深。综上,小胡杨2号作为抗旱性良好的喜光树种,可广泛用于固沙造林、植被恢复等,在干旱半干旱地区林业建设中具有良好的推广前景。
英文摘要	In this study, the response mechanism of photosynthetic and physiological characteristics to drought stress of 2 year-old Populus simonii P. euphraticaXiaohuyang 2'seedlings were studied by potted continuous drought. The results showed that (1) with drought stress aggravation, the photosynthetic mechanism of Populus simoniiP. euphraticaXiaohuyang 2'actively adjusted with the adverse conditions. The diurnal variation curves of net photosynthetic rate (Pn) and other parameters all changed from bimodal to unimodal. In response to drought, the seedlings actively adjusted their water use strategies to maintain high water use efficiency. (2) Under mild and moderate drought stress, Populus simonii * P. euphraticaXiaohuyang 2'has improved strong light utilization efficiency. The seedlings under severe drought stress have reduced respiratory consumption to preserve their photosynthetic products. They have improved weak light utilization to resist drought. (3) Through regression fitting, there were corresponding mathematical relationships between Pn, Tr, WUE, and soil water content of Populus simoniiP. euphraticaXiaohuyang 2'; the optimal range of soil moisture suitable for their growth was determined to be 7.29%-10.99%. (4) Populus simoniiP. euphraticaXiaohuyang 2'reduced the harmful effects of drought stress by accumulating osmotic adjustment substances and increasing antioxidant enzyme activity. Severe drought would inhibit its protective enzyme activity and eventually worsen the degree of membrane lipid peroxidation. The results demonstrated that Populus simonii * P. euphraticaXiaohuyang 2'is a heliophilous species with good drought resistance, which can be widely used for sand-fixing afforestation and vegetation restoration, and has a good promotion prospect in forestry construction in arid and semi-arid areas.
中文关键词	干旱胁迫 ; 小胡杨2号 ; 光合特性 ; 生理指标
英文关键词	drought stress Populus simonii*P. euphraticaXiaohuyang 2' photosynthetic characteristics physio- logical indexes
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:6884630
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353539
作者单位	齐容镰, 内蒙古农业大学沙漠治理学院;;内蒙古自治区林业科学研究院, ;;, 呼和浩特;;呼和浩特, 内蒙古;;内蒙古 010010;;010010, 中国.; 何亮, 内蒙古农业大学沙漠治理学院;;内蒙古自治区林业科学研究院, ;;, 呼和浩特;;呼和浩特, 内蒙古;;内蒙古 010010;;010010, 中国.; 莎仁图雅, 内蒙古自治区林业科学研究院, 呼和浩特, 内蒙古 010010, 中国.; 李佳陶, 内蒙古自治区林业科学研究院, 呼和浩特, 内蒙古 010010, 中国.; 李钢铁, 内蒙古农业大学沙漠治理学院, 呼和浩特, 内蒙古 010010, 中国.; 杨文斌, 中国林业科学研究院荒漠化研究所, 北京 100091, 中国.
推荐引用方式 GB/T 7714	齐容镰,莎仁图雅,李钢铁,等. 干旱胁迫对小胡杨2号幼苗光合及生理特征的影响[J]. 内蒙古农业大学,2020,37(6):1552-1561.
APA	齐容镰,莎仁图雅,李钢铁,李佳陶,何亮,&杨文斌.(2020).干旱胁迫对小胡杨2号幼苗光合及生理特征的影响.干旱区研究,37(6),1552-1561.
MLA	齐容镰,et al."干旱胁迫对小胡杨2号幼苗光合及生理特征的影响".干旱区研究 37.6(2020):1552-1561.