低磷胁迫对巴西橡胶树苗期生长及相关生理指标的影响

对巴西橡胶树实生苗进行不同磷胁迫水平(P质量浓度分别为31 mg.L-1(CK)、10 mg.L-15、mg.L-11、mg.L-1、0)的水培试验,结果表明:随着营养液磷浓度降低,橡胶树幼苗总生物量和地上生物量下降,株高、主根长降低,抽叶蓬数减少,处理间差异极为显著;低磷胁迫下橡胶树幼苗的根系生物量保持在相对较高的水平;总生物量、株高分别与抽叶蓬数之间存在极显著的正相关;随着营养液磷浓度降低,橡胶树的磷含量也随着降低,其中根、茎下降幅度大于稳定叶、嫩叶,根的磷含量最高;随着营养液磷浓度降低,橡胶树根的活性和硝酸还原酶活性下降,处理间差异极显著。

Effects of Low Phosphorus Stress on the Growth and Related Physiological Indexes during Hevea Seedling Growth Period

The hydroponic experiment was taken for hevea seedling with 5 different stress level treatments P quality concentrations:31 mg·L-1(CK),10 mg·L-1,5 mg·L-1,1 mg·L-1 and 0 mg·L-1.The results indicated that hevea young seedling biomass,above-ground biomass,plant height,main root length and the number of leaf storey decreased,there was a big difference between low P treatments and normal phosphorus supplies.Under low phosphorus stress,root biomass of heavea seedlings maintained a relatively high level.Under low phosphorus concentration,the phosphorus concentration in heavea tree decreased,and the decreased range in root and stem were larger than the mature leaf and young leaf,moreover,the phosphorus concentration in root was highest.There were significant differences in root activity and NR active between low P treatments and CK,which were decreased under low phosphorus concentration.