發(fā)布時(shí)間：2018-06-14 14:55

  本文選題：設(shè)施農(nóng)業(yè) + 局部控制地下浸潤灌溉��； 參考：《重慶交通大學(xué)》2016年碩士論文

【摘要】：我國設(shè)施農(nóng)業(yè)發(fā)展很快,為消費(fèi)者提供了豐富多彩的不同品種的反季節(jié)蔬菜、水果,但其絕大多數(shù)人采用傳統(tǒng)的灌溉方式,灌溉用水量大,采用先進(jìn)的節(jié)水灌溉技術(shù)不僅可以提高水的利用率,增加種植效益,還可以改善溫室作物的水環(huán)境病蟲害,提高產(chǎn)品品質(zhì)和產(chǎn)量。局部控制地下浸潤灌溉是在參考現(xiàn)有技術(shù)基礎(chǔ)上提出的具有較高節(jié)水潛力的灌水方法,它是利用地下水浸潤灌溉的方式,種植槽底部局部開孔,放置在一定深度的水槽中,利用土壤的毛細(xì)管作用進(jìn)行浸潤灌溉的技術(shù)。研究該技術(shù)條件下土壤水分運(yùn)動(dòng)規(guī)律和模擬對(duì)于其熟化和推廣應(yīng)用具有重要意義。本文開展了溫室栽培土不同容重土壤水分運(yùn)動(dòng)參數(shù)的測(cè)定、地下點(diǎn)源入滲及地下全面入滲試驗(yàn),較為系統(tǒng)的分析了不同容重的土壤對(duì)土壤水分特征曲線、擴(kuò)散率,地下點(diǎn)源入滲的入滲速率、累積入滲量、濕潤鋒運(yùn)移等入滲參數(shù)的影響規(guī)律,利用Green-Ampt和Philip兩種模型對(duì)實(shí)測(cè)數(shù)據(jù)進(jìn)行了擬合。研究結(jié)果表明,濕潤鋒的推移及土壤累計(jì)入滲量和入滲速率與入滲時(shí)間均呈顯著或較顯著的冪函數(shù)關(guān)系;Green-Ampt入滲模型能準(zhǔn)確的描述局部控制地下浸潤灌溉中累計(jì)入滲量與入滲時(shí)間不同的關(guān)系,Green-Ampt模型對(duì)地下有壓點(diǎn)源土壤入滲特性的模擬精度比Philip模型的高。
[Abstract]:Facility agriculture in China has developed rapidly, providing consumers with rich and varied varieties of off-season vegetables and fruits. However, most of them use traditional irrigation methods and use a large amount of water for irrigation. Adopting the advanced water-saving irrigation technology can not only improve the utilization rate of water, increase the benefit of planting, but also improve the water environment of greenhouse crops, and improve the quality and yield of the products. Local controlled underground infiltration irrigation is a kind of irrigation method with high water-saving potential, which is put forward on the basis of referring to the existing technology. It is a kind of irrigation method with underground water infiltration, and the bottom of the planting trough is partially perforated and placed in a flume at a certain depth. The technique of soakage irrigation by capillary action of soil. It is of great significance to study the law and simulation of soil moisture movement under the condition of this technology for its ripening and application. In this paper, the measurement of soil moisture movement parameters of different bulk density in greenhouse soil, the experiment of underground point source infiltration and underground comprehensive infiltration were carried out, and the characteristic curves and diffusivity of different bulk density soil to soil moisture were analyzed systematically. The influence of infiltration parameters such as infiltration rate, cumulative infiltration amount and wetting front migration on infiltration rate of underground point source is analyzed. Green-Ampt and Philip models are used to fit the measured data. The results show that Green-Ampt infiltration model can accurately describe the cumulative infiltration amount and infiltration time in local controlled underground irrigation. The simulation accuracy of Green-Ampt model is higher than that of Philip model.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：S275;S152.72

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