不同铵硝配比对芥蓝伤流液组分及植株氮磷钾积累的影响

Effects of Different Ammonium and Nitrate Ratios on Chinese Kale Bleeding Sap Component and Its Plant Nitrogen,Phosphorus and Potassium Accumulation

采用伤流液组分分析和植物营养分析的方法,探讨了不同铵硝配比(CK,0∶100;T1,10∶90;T2,25∶75;T3,50∶50)影响芥蓝生长的生理机制。结果表明:与全硝态氮营养液对照相比,3个营养液增铵处理均提高了芥蓝植株的生物量和伤流强度,其中营养液增铵25%(T2)处理的效果最好。T1处理芥蓝植株伤流液中蛋白态氮和P的流量与CK相比显著增加;T2处理芥蓝植株伤流液中NO3--N、P、K流量均为最高;T3处理芥蓝植株伤流液中NH4+-N、氨基酸态氮和蛋白态氮流量最高,而NO3--N和K流量则显著低于CK。T1处理和T2处理显著提高了芥蓝植株N、P、K的含量和积累量;T3处理亦显著提高了芥蓝植株N、P的含量和积累量,但显著降低了K的含量和积累量。综合来看,营养液适量增铵(25%)处理的效果最好,可以提高芥蓝根系吸收能力,促进氮代谢,增加植株对N、P、K的吸收和积累,从而促进植株生长。

In order to investigate the physiological mechanism of different NH4＋/NO3- ratio（0∶100, 10∶90,25∶75,50∶50）regulating the growth of Chinese kale（Brassica albograbra L.H.Bailey）, exudate composition and plant nutrient were analyzed. The results showed that compared with the control （CK）treatment,the biomass and bleeding intensity were significantly improved by ammonium enhancement treatments,in which T2 treatment had the maximum value. T1 treatment increased soluble protein-N and P flux in bleeding sap significantly,compared with the control. T2 treatment had the highest flux of NO3--N,P,Kin bleeding sap. The highest flux of NH4＋-N,free amino acid-N and soluble protein-N were found in T3 treatment,while each NO3--N and K flux was lower than that of the CK. Compared with CK,the concentration and accumulation of N,P and K were increased in T1 and T2 treatments,and the concentration and accumulation of K was reduced in T3 treatment. In conclusion,roots absorption capacity,nitrogen metabolism,and the uptake and accumulation of N,P,K were improved by appropriate enhancement（25%）of ammonium in nutrient solution,thereby plant growth was promoted.