论文部分内容阅读
采用盆栽试验方法,研究了不同水氮条件对藜麦幼苗生长指标、根系生长指标及其生理指标的影响。结果表明:藜麦各测试指标与氮肥用量、灌水控制水平关系极为密切。在同一灌溉水平下,藜麦叶面积、生物量、根系总体积等幼苗及根系生长指标均随氮肥用量的增加呈先增加后下降趋势,而根系过氧化物酶(POD)活性、丙二醛(MDA)含量等生理指标均随氮肥用量的增加呈先下降后增加的趋势;施氮量相同时,叶面积、生物量、根系总体积等形态指标均随灌水量的增加而增大,而POD活性、MDA含量等生理指标均随灌水量的增加而减小,且各处理间差异均达到显著水平;水氮交互作用对各指标均有影响对叶面积、生物量、根系总体积、POD活性的影响均达到显著水平。在试验设置的水氮范围内,藜麦均表现出不同程度的表型可塑性;在中度或重度干旱胁迫下,施肥均能缓解干旱对藜麦的胁迫。综合考虑,土壤含水量为田间持水量的75%~85%,施氮量为1~2g/kg的组合最优。
Pot experiments were conducted to study the effects of different water and nitrogen conditions on the growth, root growth and physiological indexes of quinoa seedlings. The results showed that: the test indicators of quinoa nitrogen usage and irrigation control level is closely related. Under the same irrigation level, the growth index of leaf area, biomass and total root volume of seedlings and roots of quinoa increased first and then decreased with the increase of nitrogen application rate, while the activities of peroxidase (POD), malondialdehyde (MDA) and other physiological indexes all decreased first and then increased with the increase of nitrogen application rate. When the same amount of nitrogen application, the morphological indexes of leaf area, biomass and total volume of root increased with the increase of irrigation amount, POD activity, MDA content and other physiological indicators decreased with the increase of irrigation volume, and the differences among treatments reached a significant level. The interaction of water and nitrogen had an impact on the indexes of leaf area, biomass, total root volume, POD The impact of activity reached a significant level. In the range of water and nitrogen set in the experiment, quinoa showed different degrees of phenotypic plasticity. Under moderate or severe drought stress, fertilization could alleviate the drought stress on quinoa. Taken together, the soil moisture content of 75% to 85% field capacity, nitrogen application rate of 1 ~ 2g / kg combination of the best.