不同灌水频率条件下设施土壤水盐运移特征

doi:10.11934/j.issn.1673-4831.2016.04.017

Abstract

Abstract:

In order to explore the most suitable irrigation frequency that could prevent secondary salinization of the soil in greenhouse, field investigations and an indoor soil column simulation experiment were carried out and variation of soil moisture, soil salt and some other major ions in soil profile were monitored and analyzed relative to irrigation frequency. Results show that variation of soil water content with irrigation frequency occurred mainly in the 0-20 cm depth soil. The 30 and 40 cm depth soil were soil water transition layers. Increased irrigation frequency could increase soil moisture content in the top soil layer up to 0.36 cm³·cm^-3. When the total volume of irrigation water was set, Treatment one time·(5 d)^-1, that is, irrigation conducted once every 5 days, was not conductive to moisture storage in the soil profile, but conducive to salt leaching, and better than any other treatments in this effect. However, in this case the mass center was at 23.71 cm in depth, posing a risk of salt uprising. Treatment one time·(5 d)^-1 was higher than all the other treatments in leaching rate of all the ions, except Na⁺, and the leaching rate of NO₃^- could reach as high as 65.68%. Based on the data of distribution of water and salt in soil profiles of all the treatments, Treatment one time·(10 d)^-1 or irrigation once every 10 days is considered to be the most suitable irrigation frequency under the conditions of this experiment.

Key words: greenhouse soil, irrigation frequency, movement of soil water and salt

CLC Number:

S275.4

LIU Tao, WU Xuan, ZHENG Zi-cheng, LI Ting-xuan. Effects of Irrigation Frequency on Water and Salt Movement in Greenhouse Soil[J]. Journal of Ecology and Rural Environment, 2016, 32(4): 622-631.

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Effects of Irrigation Frequency on Water and Salt Movement in Greenhouse Soil

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