【摘要】 为了明确水分胁迫条件下施氮对小麦苗期生长发育的影响,采用室内水培试验,以两个不同水氮效率基因型冬小麦品种(小偃6号和小偃22)为供试材料,在不同水分条件(5%PEG-6000胁迫和正常水分供应)下,设置三个氮水平(低氮:0.1 mmol/L;中氮1.4 mmol/L;高氮2.8 mmol/L),研究了水分胁迫下氮肥对不同水氮效率基因型冬小麦苗期株高、叶面积、植株含水率和含氮量及地上、地下生物量的影响。结果表明,同正常供水相比,除根冠比外,水分胁迫明显抑制了冬小麦幼苗的生长发育,使地上生物量、株高、叶面积、植株含氮量和含水率显著降低;适量供氮减小了降低的程度,且小偃22的表现优于小偃6号。说明水分胁迫条件下适量供氮能够减轻干旱对冬小麦生长发育的影响,水氮高效型品种小偃22较水氮低效型品种小偃6号对水分和氮素胁迫具有更强的适应性。更多还原

【Abstract】 The solution culture experiment was conducted to study the effects of water stress and nitrogen application on growth and development of winter wheat genotypes(Xiaoyan 22 and Xiaoyan 6)with different water and nitrogen use efficiency at seedling stage in three nitrogen levels(0.1 mmol/L,1.4 mmol/L,2.8 mmol/L) under normal and water stress(5% PEG-6000) conditions.The results showed that shoot biomass,plant height,leaf area,shoot nitrogen content and water content under water stress were lower than those under normal condition except R/S ratio,but suitable nitrogen application could slow down the degree of decrease and Xiaoyan 22 was superior to Xiaoyan 6.Suitable applying nitrogen under water stress could reduce the effects of drought on growth of winter wheat.Xiaoyan 22 with high water and nitrogen use efficiency was more adaptable to water and nitrogen stress than Xiaoyan 6 with low water and nitrogen use efficiency.更多还原