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Evapotranspiration and irrigation scheduling for three landscape ornamentals in Beijing, China

文献类型： 外文期刊

作者： Yuan, Xiaohuan 1 ; Teng, Wenjun 1 ; Yang, Xuejun 1 ; Wu, Juying 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res & Dev Ctr Grasses & Environm, Beijing 100097, Peoples R China

关键词： growth stage;meteorological condition;water saving

期刊名称：NEW ZEALAND JOURNAL OF CROP AND HORTICULTURAL SCIENCE （ 影响因子：1.154； 五年影响因子：1.424 ）

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收录情况： SCI

摘要： To achieve possible water savings in irrigation, the maximum crop evapotranspiration (ET) of three perennial flower plants (Sedum spectabile, Iris tectorum, and Dianthus chinensis) commonly used for landscaping in Beijing, China was studied in 2006 and 2007 using mini-lysimeters. The plants were provided sufficient water based on the ET, measurements. Although meteorological conditions differed significantly between 2006 and 2007, each species had similar evapotranspiration Curves in both years. The reference evapotranspiration ET, during the growth stage (May-October) in the 2 years was similar, being 524.93 mm in 2006 and 572.15 mm in 2007. However, marked monthly variations were noted in ET0 as well as in crop coefficients K,. Based on the precipitation, the plants required supplemental irrigation during September and October of 2006, and May, June, August, and September of 2007. Using 20 years' average precipitation for further analysis, we estimated that the plants would require supplemental irrigation during May and September in normal years. This would amount to 111.0 mm for S. spectabile, 82.0 mm for I. tectorum, and 90.2 mm for D. chinensis. For these ornamentals, irrigation according to reference ET0 may result in considerable over-watering, relative to actual plant evapotranspiration requirements. Crop coefficients may be substantially less than 1.0, therefore considerable water savings are possible, while maintaining plant vigour.

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