钠复合肥培育白刺强旱生植株的研究

Study on cultivating high-drought resistant Nitraria tangutorum plants with Na compound fertilizer application

采用盆栽育苗的方法,施用钠复合肥培育白刺(Nitraria tangutorum)植株,生长期结束测定其形态指标、生物量及Na+和K+含量,研究钠复合肥对白刺生长及其抗旱性的作用。结果表明,与对照和施(NH4)2HPO4相比,施钠复合肥培育的白刺株高分别增加了109%和45%;根长分别增加了95%和57%;主茎直径分别增加了83%和43%,主根直径增加了85%和22%;鲜质量分别增加了236%和68%;地上部中的Na+含量分别增加了49%和24%,根中的Na+含量分别增加了14%和11%。生长期结束后,盆中Na+施用量的22%被植株吸收,67%残留在盆中,可供来年植株吸收利用,淋失的Na+量占育苗前土壤Na+含量的6%。本研究表明,钠复合肥的施用能有效地促进白刺的生长并提高其抗旱性,且对土壤环境造成的影响较小。

In this study,the morphological indexes,biomass and Na＋ and K＋ contents of potted Nitraria tangutorum with Na compound fertilizer application were determined to investigate the effects of Na compound fertilizer on drought resistance of N.tangutorum.The results indicated that compared with control（no fertilizer） and diammonium phosphate,Na compound fertilizer improved significantly plant height by 109% and 45%,root length by 95% and 57%,main stem diameter by 88% and 43%,main root diameter by 85% and 22%,fresh weight by 236% and 68%,shoot Na＋ content by 49% and 24%,and root Na＋ content by 14% and 11%,respectively（P0.05）.At the end of growth period,11% of Na＋ contents in Na compound fertilizer was absorbed by N.tangutorum,67% left in the potted soil,which could be absorbed by N.tangutorum in the following years.The leached Na＋ contents only accounted for only 6% of soil Na＋ content.Our results indicated that Na compound fertilizer could not only promote the growth also improve drought-tolerance of N.tangutorum and had non-significant effects on soil environment.