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Ningxia University (2018)

Optimization of Planting Structure Based on Water Footprint at the Yellow River Pumping Irrigation Area in the Middle Arid Zone of Ningxia

赵芮;

Titre : Optimization of Planting Structure Based on Water Footprint at the Yellow River Pumping Irrigation Area in the Middle Arid Zone of Ningxia

Auteur : 赵芮;

Grade : Master’s Theses 2018

Université : Ningxia University

Résumé
The water requirement and effective rainfall of the main crops in the middle arid zone of Ningxia were calculated by CROPWAT8.0,and the the blue water footprint and-green water footprint of main crops were calculated,and the grey water footprint was calculated based on the chemical fertilizer application amount,and the crop planting structure of the Yellow River pumping irrigation area in the middle arid zone of Ningxia was optimized based on the water footprint of each major crop and the status quo of the water resources and the status of agricultural planting in the Yellow River pumping irrigation area in the middle arid zone of Ningxia..The main results were as follows :(1)The planting structure of the arid zone in middle Ningxia was mainly based on grain crops,supplemented by economic crops,and the sown area of grain crops was much larger than the sown area of vegetables and fruits,and the proportion of food crops accounted for 77.34%of the total sown area.It was much larger than the sown area of other kinds of crops ;the proportion of economic crops accounts for 22.66%of the total sowing,of which most of them were 12.36%for oil sunflowers.The sown area of food crops was too large,water was more concentrated,and water resources were under pressure.(2)From the point of view of time,the peak of crop water demand was in May,June,July and August,and the daily peak demand of wheat and melon crops was concentrated in May and June ;the peak daily water requirement of maize was June and July ;July and August were peak daily water demands of potato crops and oil crops ;alfalfa were perennial herbaceous plants and were divided into five pods a year.This paper did not consider the wintering season and would last for one year.Divided into four pods,the peak daily water demand was mainly concentrated in four months,five months and seven months.It can be seen that most of the demand for crops and water were concentrated in July,and a few were concentrated in August.July and August were the peak periods of daily water consumption of crops other than wheat and fruit crops.(3)The blue water footprint and green water footprint were generally wavy from 2007 to 2015.When the blue water footprint was high,the green water footprint was low.This meant that when the irrigation water volume was low,the effective rainfall was high,and when the irrigation water volume was high,the effective rainfall was low.From the point of view of the composition of the water footprint,the water footprint of all types crops in the middle arid zone of Ningxia was dominated by the blue water footprint,followed by the green water footprint,and the grey water footprint only accounted for a small portion of it ;from the perspective of different crop types,

Mots clés : Water Footprint; The Middle Arid Zone of Ningxia; Agricultural Structure; Yellow River Pumping Irrigation Area; Multi-objective Model;

Présentation (CNKI)

Page publiée le 26 avril 2019