陕北风沙滩地区紫花苜蓿地下滴灌带埋设深度初步研究

Different Buried Depths of Underground Drip Irrigation on Alfalfa Land in the Sandy Area of North China

研究了半干旱沙区不同滴灌带埋设深度下紫花苜蓿的生长特性。通过试验研究分析了滴灌带埋设深度对紫花苜蓿植株高度、茎粗、分枝数、根系生长、根系密度和产量等生长特性的影响。采用主成分分析法对不同滴灌带埋设深度的紫花苜蓿等生长特性进行了综合评价。结果表明,滴灌带不同埋设深度对苜蓿各个生育期生长特性指标影响不同。在苗期,埋设深度为10 cm的处理,有利于苜蓿生长。从分枝期起,埋设深度为30 cm的处理优于其它处理;在整个生育期内,不同埋设深度对苜蓿生长特性影响的综合评判结果为:埋深30 cm>埋深20 cm>埋深10 cm>埋深40 cm。

The characteristics of alfalfa growth in the semi-arid sandy area for different buried depths of underground drip irrigation are studied. Effects of the buried depths on alfalfa plant height, root collar diameter, branch number per plant, root length, weight density, and yield are investigated experimentally. Principal component analysis is used for comprehensive evaluation. Results show that the dropper installed at different depths affects the indexes of various alfalfa growth characteristics. In the seedling stage, the 10 cm laying depth treatment is conducive to alfalfa growth. From the branching period, the 30 cm laying depth treatment is superior to other treatments. Throughout the growth period, the buried depths rank in the descendant order of 30, 20, 10, and 40 cm in terms of the comprehensive evaluation for the effects of different laying depths on alfalfa growth characteristics.