论文部分内容阅读
[目的]分析不同水分处理对紫花苜蓿植株高度与生长速度、产量、耗水量及耗水规律的影响关系。[方法]通过地下滴灌紫花苜蓿在4种不同水分处理(W_1:22.5 mm,W_2:30 mm,W_3:37.5 mm,W_4:45 mm)下产量与土壤含水量的观测试验,得到不同水分处理下紫花苜蓿水分利用效率、耗水量及耗水规律。[结果]不同水分处理下紫花苜蓿植株高度与灌水量呈现线性关系,在生育期内不同水分处理对苜蓿植株高度的影响为W_4>W_3>W_2>W_1;随着灌水量的增加紫花苜蓿干物质产量呈先升后降的趋势,苜蓿干物质产量与灌水量存在二维抛物线关系;不同水分处理下紫花苜蓿水分利用效率为W_1>W_2>W_3>W_4,从实现紫花苜蓿高产、优质及节水增效的目标出发,紫花苜蓿在地下滴灌条件下,适宜的灌水处理为W_3。[结论]不同水分处理下紫花苜蓿耗水量随灌水量的增加而增大,在全生育期的耗水量变化规律是由小到大,再由大到小。
[Objective] The research aimed to analyze the effects of different water treatments on the plant height, growth rate, yield, water consumption and water consumption of alfalfa. [Method] The yield and soil water content of alfalfa under four different water treatments (W_1: 22.5 mm, W_2: 30 mm, W_3: 37.5 mm, W_4:45 mm) Alfalfa water use efficiency, water consumption and water consumption. [Result] Under different water treatments, the height of alfalfa plants showed a linear relationship with the irrigation amount. The effects of different water treatments on alfalfa plant height during the growth period were W_4> W_3> W_2> W_1. With the increase of irrigation amount, the dry matter of alfalfa The yield of L. alfalfa increased firstly and then decreased, and there was a two-dimensional parabola relationship between dry matter yield and irrigation volume. The water use efficiency of alfalfa was W_1> W_2> W_3> W_4 under different water treatments. According to the goal of efficiency improvement, alfalfa under the conditions of underground drip irrigation, suitable irrigation treatment W_3. [Conclusion] The water consumption of alfalfa under different water treatments increased with the increase of irrigation water, and the change law of water consumption during the whole growth period was from small to large and then from small to large.