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Inner Mongolia Agricultural University (内蒙古农业大学) 2021

Study on Drought Resistance of Populus simonii × P. Euphratica ‘Xiaohuyang 2’ under Different Irrigation Gradients

齐容镰

Titre : Study on Drought Resistance of Populus simonii × P. Euphratica ‘Xiaohuyang 2’ under Different Irrigation Gradients

Auteur : 齐容镰

Grade : Master 2021

Université : Inner Mongolia Agricultural University (内蒙古农业大学)

Résumé partiel
When constructing artificial forests as the main method for ecological restoration in areas with harsh natural environments,moisture is a key factor affecting the survival of afforestation and the growth of forest trees,and there is also the problem of lack of tree species.Selecting high-resistance sand-growing fine tree species and systematically researching their drought resistance mechanism is of great significance to afforestation practice.In this thesis,the Populus simonii×P.Euphratica‘Xiaohuyang 2’was used as experimental material,and different irrigation gradients were set up through field experiments to explore the changes of photosynthesis,leaf water content and physiological and biochemical characteristics of the hybrid tree species under different degrees of drought stress.The response mechanism to different water conditions of Populus simonii×P.Euphratica‘Xiaohuyang2’was systematically analyzed and the suitable water range was determined through the above experiments.The main results were as follows :(1)With the decrease of irrigation amount,the new branch length and diameter growth of Populus simonii×P.Euphratica‘Xiaohuyang 2’decreased in different degrees.Moreover,the inhibitory effect of soil water deficit on the length of new branches was more obvious.(2)Under three irrigation amounts,the relative water content of Populus simonii×P.Euphratica‘Xiaohuyang 2’leaves gradually decreased with the increase of irrigation days,and the water saturation deficit of leaves maintained increasing in different degrees.Under 500m3·hm-2irrigation treatment,Populus simonii×P.Euphratica‘Xiaohuyang 2’adjusted water use strategy to slow down the decrease of leaf water content to the greatest extent

Mots clés : Drought resistance ;Populus simonii × P. Euphratica‘Xiaohuyang 2’ ;Growth;Water physiology ;Photosynthetic characteristics ;Antioxidant enzyme activity ;

Présentation (CNKI)

Page publiée le 22 février 2022