| Water is the source of life,the key of production and the foundation of ecology.The people's daily life,socioeconomic development and grain productin is inseparable from water.People is linked to water stronger and stronger.With the rapid growth of population and rapid economic development,global extrem climate intensifies,severe water pollution and waste of water resource,the imbalance between supply and demand of water is sharper day by day.Due to the effect of moonsoon climate in our country and uneven space-time distribution of water resources,water resources utilization is difficult.However,our country is an agricultural country,agricultural water consumption accounts for more than two-third of the total water consumption.In arid and semi-arid areas of our country the agricultural water supply situation is particularly grim,so there isn't show a obviously increase in irrigable water.Developing water-saving agriculture is the important strategy of the sustainable development of water resources in our country and also the inevitable choice of sustainable stable and high yield of grain regional production.Therefore,for the research of water-saving irrigation and optimal allocation of agricultural water resources is complete critical and necessary.In this paper,on the basis of summarizing the domestic and forein research present situation and existing problems and the adaptablity of real-time inadequate irrigation system model based on crop,and for researches of water-saving irrigation based on irrigation test of different water treatment for winter wheat.The main part includes the following several aspects:1.real-time inadequate irrigation system model for winter wheat is established.On the basis of deep understanding of the balance principle of field water,establishing real-time inadequate irrigation system model for winter wheat and making a further analysis of the effect of various parameters in the model and then inthe final introducing the computing method of parameters in the model.2.Irrigation model parameters of winter wheat are corrected.Based on irrigation experiment of different water treatment of winter wheat and combined with soil moisture monitoring data and real-time meteorological data,which correct parameters such as the value of soil moisture content in the model,the calculation of effective rainfall,crop coefficient and so on.This improves the accuracy of the real-time irrigation forecast and provides more accurate data for the establishment of real-time irrigation system.3.Winter wheat adaptive real-time irrigation forecast is studied.On the basis of real-time inadequate irrigation forecast,building the drought evaluation index system and dividing the drought rating standard,by the forecast model of real-time soil moisture,combining with the short-term weather forecast to predict soil moisture and other drought indexes in the future 5-10 d,using drought rating standard to judge the drought condition in the future 5-10 d and then establishing real-time adaptive irrigation forecast which conforms with the climate change.Finally through irrigation forecast on winter wheat yield makes a contrastive analysis.4.The technology of real-time water resources optimal allocation in irrigation area is studied.From traditonal irrigation water resources optimal allocation which easily cause irrigation program inconsistent with the actual production and based on the theory of winter wheat real-time adaptive deficit irrigation,which built a model of water resources real-time optimal allocation.With the goal of maximizing the irrigation economic efficiency combined with the forecast of winter wheat real-time irrigation,making a calculation and analysis of water resources real-time optimal allocation. |
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