氯化钠胁迫下施氮对冬小麦生长发育及体内氯、钠离子积累的影响

温室盆栽试验研究了不同NaCl胁迫水平下施氮对冬小麦生长发育及氯、钠离子吸收特性的影响。结果表明,在盐胁迫下,施用化学氮肥能显著增加小麦株高与叶面积,使产量提高。施氮后不但增加了小麦植株体含氮量,而且抑制了苗期Cl-在植株体的积累和生长后期Na+在植株体的积累。利用植株体N/Cl比和N/Na比可作为衡量施氮对小麦不同生育期植株体累积Cl-、Na+抑制效果的指标。

Effects of nitrogen fertilization on growth and vivo Cl- and Na+ accumulation of winter wheat under NaCl stress

A pot experiment was conducted at glasshouse to study effects of nitrogen fertilization on growth and in corpore accumulation of Cl~- and Na~ in winter wheat under NaCl stress. Urea and NaCl were served as the source of nitrogen and salt respectively. Experimental design was randomized complete block designs with three replications. Four rates of urea were applied: N 0 ( no N applied), 0.1, 0.30 and 0.45 g/kg soil and four levels of NaCl were applied to make for soil salinity: 1.0, 2.0, 3.0 and 4.0g/kg soil. Urea and NaCl was single base applied after evenly mixed with the experiment soil. Seeds were sowed after forcing of germination, and thinning was carried out at 3-leaf stage. 5 plants for each pot were sampled at tillering stage. Distilled water was used to keep all treatment at same water content. The results indicated that nitrogen fertilization could increase plant height and leaf area significantly, and in turn increased wheat yield under NaCl stress conditions. The possible regulation mechanism of nitrogen fertilization was the augment of plant nitrogen content, resulted in the decrease Cl~- accumulation at early growth period and Na~ accumulation at late growth period. N/Cl ratio and N/Na ratio of plant,as new measurement indexes to appraise effects of nitrogen fertilization to reduce (accumulation) of Cl~- and Na~ in winter wheat was also brought forward.