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China Forestry Science Academe (2018)

Study on Deep Soil Recharge Characteristics and Response for Irrigation of the Irrigation Farmland in Ulan Buh Desert

李艳丽;

Titre : Study on Deep Soil Recharge Characteristics and Response for Irrigation of the Irrigation Farmland in Ulan Buh Desert

Auteur : 李艳丽;

Grade : Doctoral Dissertation 2018

Université : China Forestry Science Academe

Résumé
The distribution of water resources is not balanced in China.The contradiction between water and land resources is especially prominent in Northwest China.With the increase of population,economic growth,the continuous improvement of the people’s living standards and the acceleration of the urbanization process,the agricultural water resources and the management of agricultural water use in the northwest arid area are facing great challenges.The study area is located in Dengkou County on the east edge of the Ulan Buh Desert.The area is located in the upper reaches of the Hetao irrigation area,and the ecological environment is fragile.The irrational use of water resources will cause a series of environmental problems,such as land desertification,groundwater funnel,secondary salinization and so on.How to improve the agricultural water-use-efficiency(WUE)and reduce the loss of agricultural water is important to improve the existing irrigation systems and the sustainable development of the region.The deep soil recharge(DSR)of irrigated farmland is one of the main reasons that affect the efficiency of agricultural water use.Therefore,the systematic analysis of soil moisture and DSR law of different soil types farmland is of great practical significance to the study of farmland ecological hydrological process,guidance of agricultural production and the rational utilization of regional water resources.In this study,three soil types(sandy soil,loam,clay)in Ulan cloth and sand area are replaced by the soil layer below 50cm in the Common Maize Farmland in Dengkou County,East edge of the Ulan cloth and the eastern edge of the desert.Using ECH2O-5 soil moisture sensor,type 105 soil temperature sensor and YWB-01 type soil deep water leakage recorder,real-time,continuous and dynamic monitoring and monitoring of soil volume and water content in soil layer of 0150cm soil layer,05cm soil layer soil temperature and150cm in soil soil and clay farmland from January 1,2017 to December 31st are monitored and monitored.The deep leakage of the layer below the layer.Comprehensive analysis of the law of deep seepage in farmland of different soil types ;accurately calculate the value of each component in the water balance of farmland through actual monitoring value,and estimate the optimal irrigation water of different soil types from the angle of reducing the loss of water resources leakage

Mots clés : Ulan Buh Desert; Irrigation; Deep soil recharge; Water balance; Optimal irrigatio;

Présentation (CNKI)

Page publiée le 8 avril 2019