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Accueil du site → Doctorat → Chine → 2009 → Efficient Water Use Mechanism And Application Patterns Of Optimized Regulated Deficit Irrigation Of Pear-Jujube Tree In The Semi-Arid Region Of Northwest China

Northwest University of Science and Technology (2009)

Efficient Water Use Mechanism And Application Patterns Of Optimized Regulated Deficit Irrigation Of Pear-Jujube Tree In The Semi-Arid Region Of Northwest China

崔宁博; Cui Ning Bo

Titre : Efficient Water Use Mechanism and Application Patterns of Optimized Regulated Deficit Irrigation of Pear-Jujube Tree in the Semi-Arid Region of Northwest China

Auteur : 崔宁博; Cui Ning Bo

Grade : Doctoral Dissertation 2009

Université : Northwest University of Science and Technology

Résumé partiel
The area of the arid and semi-arid regions accounts for about 52.5% of the total area of China, and the rainfall of the crop growth stages in most areas of the semi-arid region in Northwest is less than 250mm, which cannot meet the water demand for normal growing, so irrigation has a irreplaceable effect on the high and stable yield. The lower irrigation water use efficiency in the study area and irrational competitions for surface water between its upper and lower reaches have resulted in serious soil erosion, deteriorated ecosystem and serious conflict of water shortage for both agricultural and ecological water demand. However, this area is an important productive base of good quality fruit due to the abundant sunshine and large day/night temperature range. The pear-jujube which is the special local export fruit of this area and also one of the supporting industries should be mainly developed during the process of the planting structure adjustment. So, to use the limited water resources for efficient irrigation of these crops and to enhance irrigation water efficiency have become an important issue of this area.According to the scarce water resources the fruit industry in the semi-arid region of northwest are facing, this paper focuses on the characteristic economy fruit tree, pear-jujube tree, and developed on the experiments in the greenhouse and the oasis field respectively in Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University and in the pear-jujube orchard located in Chengguan Village, Dali Town, ShaanXi Provence. This paper has made systematic research about characteristics of soil water dynamic changes, water deficit of the root-zone of pear-jujube tree with regulated deficit irrigation, physiological control in the process of the water use and the stomal response mechanism of pear-jujube tree under the water deficit environment, and the effects of different deficit irrigation levels at different growth stages vegetative growth and repproductive growth of pear-jujube trees, and also its regulation mechanism.This paper also analyses the effect of water deficit on water use, yield, fruit quality, crop coefficient, water use efficiency and economical benefit, and achieved the followings :⑴The research of the water deficit treatment and rewater domino effect significantly test that proper water deficit can regulate and control stomal open degree efficiently, reduce the overtranspiration of leaves, stimulate the compensating effects. It also primarily reveals the mechanism of the regulated deficit irrigation which can enhance the leaf water use efficiency, the mechanism of regulation and control to the stomata caused by“dry-wet alternative process”originated from the water deficit, and also the mechanism of physiological water saving of the regulated deficit irrigation from physiology of the fruit tree.⑵It reveals the control process to the growth of pear-jujube tree which is caused by the regulated deficit irrigation, primarily illuminates the cause of the effects of different deficit irrigation levels at different growth stages on the vegetative growth and reproductive growth of pear-jujube trees, the fruit growth and the yield of the pear-jujube and offers a theory basis for the enhancement in the yield of the pear-jujube and of water use efficiency.⑶The dynamics of the sap fluxes of pear-jujube tree in the greenhouse under different deficit irrigation treatments at different growth stages and its quantitive relationship with reference crop evapotranspiration and soil water content, indicate that different deficit irrigation treatments not only can decrease the irrigation water amount significantly, but also make the maximum decrease of the sap flow amount just be only by 10.5%, and even the phenomenon that the sap flow amount is a little bit higher than the reference crops is observed, which illustrates that the“dry-wet alternative”in the rootzone of pear-jujube tree under the treatment of water deficit can stimulate the root to produce significant compensating effects of water supping.

Mots clés : Semi-arid regions in Northwest; pear-jujube tree (Zizyphus jujube Mill.); water use efficiency; optimized regulated deficit irrigation pattern;

Présentation (CNKI)

Page publiée le 21 avril 2013, mise à jour le 20 avril 2018