土壤渍水对冬小麦根系生长及营养代谢的影响

研究了不同生育时期、不同渍水时间对冬小麦根系生长及营养代谢的影响.结果表明,在小麦孕穗期以前,土壤渍水可刺激次生根的发生,使表层次生根数增多,根系中N含量及分配比例、可溶性糖含量、C/N等经短期渍水上升,延长渍水时间则又下降;孕穗期以后,土壤-经渍水即引起以上诸性状下降,且下降幅度随生育进程的推移而增大.小麦各生

Effect of Waterlogging on the Growth and Nutrient Metabolism of the Root System of Winter Wheat

The effect of different durations of waterlogging at different growth stages, on the growth and nutrient metabolism of the root system of winter wheat was studied. The results indicated that short term waterlogging before the booting stage could stimulate the root system to produce more secondary roots in the top soil, increase the N content and proportion of N distributed to the root system, and the content of soluble of sugar, and elevate the C/N ratio. But prolonging of the waterlogging duration (WLD) could lead to decrease of all these attributes. After booting stage, waterlogging would invariably cause pronounced decrease of these characters, and the magnitude of the decrease became larger with the progress of the growth and development of the wheat plant. At all growth stages, the biomass, N accumulation, P accumulation, P content and P proportion of the root system would decrease with the prolonging of the WLD. This is more evident at teh filling stage, when waterlogging for 5 days could seriously handicap the growth and metabolism of the root system, and waterlogging for 10 days could reduce the N and P accumulation to more than 1/2 of those under normal conditions.