供氮水平对爬山虎幼苗生长形态和氮分配的影响

通过水培试验,研究了不同氮素水平(0、0.15、0.3、0.45、0.6和0.75g.L-1)条件下爬山虎幼苗的生长形态和体内氮分配状况.结果表明:低氮处理的爬山虎侧枝发育较小,而较高氮处理的侧枝着生位置低,且长度显著高于低氮处理;供氮水平的提高能促进植株的生物量及茎、叶、根氮含量和氮累积量的增加,其中叶生物量占全株生物量的比例最高,在50%以上;叶的氮累积量占整个植株总氮量的60%～70%.

Effects of nitrogen supply on Parthenocissus tricuspidata seedling morphology and nitrogen allocation

With hydroponic culture, this paper studied the effects of different nitrogen (N) supply levels (0, 0.15, 0.3, 0.45, 0.6, 0.75 g N x L(-1)) on the seedling morphology and N allocation of Parthenocissus tricuspidata. The results showed that lower N supply retarded the development of P. tricuspidata seedling's branch; while higher N supply had significant effects in promoting the seedling's early branching and lowering the branching position on the main stem. Supplying higher amount of N increased the plant biomass and the N concentration in root, leaf and stem significantly. Compared with stem and root, leaf had the highest biomass, accounting for 50% of the total biomass, and the highest N accumulation, accounting for 60%-70% of the total accumulated N.