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Hebei Normal University (2020)

Study on Global Crop Water Demand and Water Shortage in Major Agricultural Production Countries

张雅芳;

Titre : Study on Global Crop Water Demand and Water Shortage in Major Agricultural Production Countries

Auteur : 张雅芳;

Grade : Master’s Theses 2020

Université : Hebei Normal University

Résumé
The shortage of water resources worldwide is becoming increasingly serious and has become a global crisis.In recent years,climate change,socio-economic development and population growth have not only affected the supply of water resources,but also greatly affected the demand for water resources.More than 70%of the world’s water was used for agricultural production,and 90%of the water footprint of human consumption comes from agricultural products.Agriculture has become the industry that consumes the most water.About 80%of the world’s rain-fed agricultural areas produced about 60%of the world’s food,while irrigated agricultural areas,which account for 20%of arable land,produced about 40%of the world’s food.The uneven distribution of water resources in time and space,coupled with the high water consumption characteristics of agriculture,and the irrational use of water resources,have brought tremendous pressure on agricultural water supply.At the same time,climate change and changes in the scale of crop planting will inevitably affect the water demand pattern of regional agriculture,and then affect regional water balance.Therefore,a comprehensive understanding of the pattern of crop water demand and the degree of water scarcity in typical river basins under the background of climatic factors and changes in planting scale is of great significance to reveal the contradiction between the supply and demand of agricultural water resources,scientific and reasonable water resource management,agricultural planting scale adjustment and the formulation of regional irrigation schemes.In order to evaluate the impact of climatic factors and planting scale on the water demand of major global crops,the crop coefficient method was used to calculate the water demand intensity of major crops in the world after correction of daily-scale crop coefficients.Then,we quantitatively analyzed the influencing factors of crop water demand in major agricultural countries by combining the characteristics of crop planting scale and climatic factors.Finally,through the analysis of the rainfall deficits in the major basins of the major agricultural producing countries,the characteristics of the spatial and temporal changes of the agricultural water shortages in the major basins were clarified,The the following conclusions were mainly drawn:1.From the characteristics of water demand intensity of major crops in the world,the water demand intensity of wheat was mostly between 350mm-700mm.The water demand intensity of winter wheat was relatively high,generally greater than 450mm,while that of spring wheat was relatively low,generally less than 450mm

Mots clés : Water demand for crops; Planting scale; Precipitation deficit; Climate change;

Présentation (CNKI)

Page publiée le 31 octobre 2020