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| DOI：10.13522/j.cnki.ggps.2019315 |
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| The Effect of Irrigation with Cool Water on Soil Temperature and Growth of Spring Highland Barley in High-altitude Regions |
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LIU Wei, XU Bing, TANG Pengcheng, LI Zekun
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1.College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 01018, China; 2. Institute of Water Resources for Pastoral Area, China Institute of Water Resources and Hydropower Research, Hohhot 010020, China
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| Abstract: |
| 【Background】Snowmelt water is a potential resource for irrigation in Tibet but is cool; irrigation using cool water in this region could damage crops due to the combined effects of low oxygen, high radiation and frequent cold-warm cycling in the surface of the thin soil layer. The typical detrimental impact of irrigation with cool water is reduction in root activity and germinating rate, as well as crop mortality. Barley is a main crop in Tibet, accounting for 60% of the total planting area in the region.【Objective】The purpose of this paper is to understand the effects of spring-irrigation with snowmelt water on crop yield in the alpine region of Tibet in attempts to provide guidance to help rationally use the snowmelt water for agricultural production in this region.【Method】 The experiment was conducted in a barley field in spring, 2018. The temperature of the irrigation water was set at 3, 5, 7 ℃ respectively, with irrigation with water taken from a storage tank at temperature of 7~15 ℃ as the control. In each treatment, we measured the growth and yield of the barley, as well as the change in soil temperature.【Result】Compared with CK, irrigating with cool snowmelt water decreased the average temperature in 0~10 cm and 10~20 cm soil by 1.41 and 0.67 ℃ respectively, and reduced the average plant height, 100-grain weight and average plant era length by 6.3 cm, 1.26 g and 0.67 cm respectively. The main damage of the cool water occurred at the tillering stage by delaying seedling emergence and the subsequent tillering. Its impact at the jointing stage was a decrease in effective numbers of ears, delaying the mature process and reducing root development and the booting filling. Compared with CK, T1, T2 and T3 reduced the yield by 19.62%, 38.59% and 42.52% respectively, indicating that the yield decrease was consistent with the decrease in temperature of the irrigation water.【Conclusion】The cool snowmelt water in the high-altitude areas in Tibet should be used with warm water from reservoirs for irrigation in order to avoid damage to the crop. Deficit irrigation during the tillering period could be beneficial to reducing such damage. |
| Key words: snowmelt water; irrigation; soil temperature; yield; barley; alpine region |
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