苗期施用钠复合肥增强梭梭抗逆性的初步研究

Tentative research of Na compound fertilizer at seedling stage on enhancing drought resistance of Haloxylon ammodendron

利用盆栽育苗的方法,施用钠复合肥后培育梭梭植株,使其正常生长70 d后干旱20 d进行沙地移栽试验,3个月后生长期结束测定其形态指标、生物量以及Na+和K+含量,初步探讨了钠复合肥在培育强抗旱梭梭植株方面所起的作用。与对照(不施任何肥料)和施用(NH4)2HPO4(与钠复合肥含等量的N、P)的处理相比,施用钠复合肥的梭梭株高分别增加了26%和12%;分枝数增加了22%和14%;主茎直径分别增加了48%和23%、主根直径分别增加了37%和24%;冠幅分别增加了57%和28%;根冠比均增加了18%;鲜重分别增加了130%和74%、干重分别增加了154%和74%;地上部的Na+含量分别增加了45%和38%,根中的Na+含量分别增加了15%和12%;地上部中的K+含量差异不显著,根中K+含量分别降低了28%和31%。以上结果表明,钠复合肥的施用能有效地促进梭梭的生长并提高其抗旱能力。

We mainly investigated morphological indexes,biomass,Na＋ and K＋ contents using potted Haloxylon ammodendro seedlings transplanted into a sandlot at the end of the three months growing season.There is a preliminary discussion on the effects of Na compound fertilizer application on induction of strong drought resistance in H.ammodendro seedlings.Comparing Na compound fertilizer with the control and with Diammonium phosphate,plant height increased by 42% and 18%,the branching number by 22% and 14%,the main stem diameter by 48% and 23%,the main root diameter by 37% and 24%,the crown diameter by 57% and 28%,the root/shoot ratio by 18% and 18%,the total fresh biomass by 130% and 74%,the total dry biomass by 154% and 74%,and the Na＋ contents of shoots by 60% and 49%,but the K＋ contents of roots decreased by 28% and 31% respectively（P0.05）.It is suggested that Na compound fertilizer application not only promotes the growth,but also improves drought-tolerance of H.ammodendro seedlings.