半干旱区水钾互作对春玉米氮代谢的影响

Effects of Water Potassium Interaction on Nitrogen Metabolism of Spring Maize in Semi-arid Area

为研究水钾互作对春玉米氮代谢的影响,丰富水钾互作对春玉米氮代谢调控的理论,为春玉米节水、优质发展提供理论依据及实践指导。本文采用裂区试验设计,设置3个灌溉水平和3个钾素营养水平,通过测定氮代谢关键酶活性,探究水钾互作对春玉米氮代谢的影响。研究表明,在同一灌溉水平下,玉米氮代谢关键酶活性整体表现为K1>K2>K0,其中对谷氨酸合成酶活性影响最大,K1比K2、K0分别提高了7.80%和37.02%,在同一钾素营养水平下,玉米氮代谢关键酶活性表现为W3>W2>W1;其中W3条件下,可溶性蛋白提高最多,W3分别比W1、W2提高22.74%和8.49%。水钾互作对春玉米氮代谢关键酶活性表现出显著的交互作用。因此,氮代谢关键酶活性会随着灌溉水平升高而增强;在一定钾素水平内,氮代谢关键酶活性会随着钾素营养水平增加而增强,但过高的钾肥水平会抑制其活性;水钾互作会显著影响春玉米氮代谢强度。

To study the effect of water potassium interaction on nitrogen metabolism of spring maize,enrich the theory of water potassium interaction on nitrogen metabolism regulation of spring maize,and provide theoretical basis and practical guidance for water-saving and high-quality development of spring maize.The split plot experimental design was used to set three irrigation levels and three potassium nutrition levels.The effects of water potassium interaction on nitrogen metabolism of spring maize were explored by measuring the activities of key enzymes of nitrogen metabolism.The results showed that under the same irrigation level,the overall activity of key enzymes of maize nitrogen metabolism was K1>K2>K0,which had the greatest impact on the activity of Glutamate Synthase.K1 increased by 7.80%and 37.02%respectively compared with K2 and K0.Under the same potassium nutrition level,the activity of key enzymes of maize nitrogen metabolism was W3>W2>W1;Under the condition of W3,the soluble protein increased the most,and W3 increased 22.74%and 8.49%compared with W1 and W2,respectively.The interaction of water and potassium showed significant interaction on the activities of key enzymes of nitrogen metabolism in spring maize.The activities of key enzymes of nitrogen metabolism will increase with the increase of irrigation level;Within a certain potassium level,the activity of key enzymes of nitrogen metabolism will increase with the increase of potassium nutrition level,but too high potassium level will inhibit its activity;The interaction of water and potassium could significantly affect the intensity of nitrogen metabolism in spring maize.