钠复合肥提高多浆旱生植物霸王幼苗生长及抗旱性

本研究采用室内盆栽实验,探讨了一种由适量的氮、磷和钠等元素组成的钠复合肥对多浆旱生植物霸王幼苗生长及抗旱性的影响。结果表明,干旱胁迫下施钠复合肥后,与对照和磷酸二铵肥相比,霸王幼苗的株高增加了30%和12%、叶面积增加了97%和40%、叶相对有机干重增加了10%和7%、叶干重增加了57%和38%、叶含水量增加了347%和55%,净光合速率增加了145%和24%、PSⅡ原初光能转换效率增加了6%和4%、电子传递速率增加了16%和8%、量子产额增加了14%和5%,而叶MDA含量下降了58%和18%、相对质膜透性下降了50%和26%。另外,与对照相比,施钠复合肥后霸王幼苗水分利用效率提高了4%。这些结果说明,钠复合肥能够促进干旱胁迫下霸王幼苗的生长、提高其抗旱性,并且效果优于磷酸二铵肥。

Sodium compound fertilizer improved growth and drought tolerance of Zygophyllum xanthoxylum seedlings under drought stress

In this study, the effect on growth and drought tolerance of the succulent xerophyte Zygophyllum xanthoxylum under drought stress of a Na compound fertilizer that contains appropriate amounts of nitrogen, phosphorous and sodium was studied in a pot experiment. Compared with control and diammonium phosphate treatments, the application of Na compound fertiliser increased plant height by 30% and 12%, leaf area by 97% and 40%, leaf relative organic weight by 10% and 7%, dry weight by 57% and 38%, water content by 347% and 55%, net photosynthetic rate (P_n) by 145% and 24%, primary light energy conversion of PSⅡ by 6% and 4%, photosynthetic electron transport rate by 16% and 8%, quantum yield by 14% and 5%, but decreased leaf malondialdehyde concentration by 58% and 18%, and penetrability of membranes by 50% and 26% respectively under drought stress. Meanwhile, the application of Na compound fertilizer significantly increased water use efficiency by 4%, compared with control pots. These results suggested that Na compound fertilizer could promote growth and enhance drought tolerance of Z. xanthoxylum, and the effectiveness was greater than diammonium phosphate.